Ford Taurus Service Manual: Diagnosis and Testing

Automatic Transmission

Special Tool(s)

Ford Taurus. Automatic Transmission

Material

Ford Taurus. Automatic Transmission

DTC Chart

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

For all other DTCs, refer to Section 303-14.

Diagnostic PID Chart

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Module PID Chart

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Symptom Chart

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

In most circumstances, the PCM sets DTCs to help guide with diagnostics. Refer to the DTC Chart before using the symptom chart. The Condition column lists the vehicle condition. The Possible Sources column lists a detailed vehicle condition. The Action column lists the action to be performed to determine the cause of the condition. Each action lists the components that can cause the condition and the individual components in that system. The components are listed in order of disassembly. Use the list of components and the required action to focus on disassembly inspections for the root cause of the concern.

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Pinpoint Tests 3.5L/3.7L Ti-VCT

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

  • Carry out OBD procedures KOEO and KOER.
  • Retrieve and record all DTCs.
  • Repair all non-transmission DTCs first.
  • Repair all transmission DTCs second.
  • Clear all CMDTCs and attempt to repeat them.
  • Repair all CMDTCs.
  • If only pass codes are obtained, refer to Component Tests in this section for further information and diagnosis.

Power is routed through the transmission solenoid power control relay (inside the PCM) to all transmission solenoids. If the power circuit to the transmission solenoids or the transmission solenoid power control relay fails open, all solenoids are failed electrically off. Check for open, short to ground or the transmission connector disconnected. The transmission solenoid power control relay disables power to the transmission solenoids when certain transmission DTCs are set.

Pinpoint Test A: SSA

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

SSA is a VFS. The PCM controls current flow through the solenoid ground input.

NOTE: Without a voltage signal return to the PCM, the transmission solenoid power control relay is commanded off. Using a fused jumper wire between a transmission solenoid control circuit and the signal return circuit, the transmission solenoid power control relay circuit supplies power to the transmission solenoids when the ignition is cycled from off to on. Do not use a solenoid control circuit that may be at fault, refer to DTC Charts in this section for a fault listing.

DTC Fault Trigger Conditions

Ford Taurus. Automatic Transmission

    Possible Sources
  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • SSA
  • PCM

PINPOINT TEST A: SHIFT SOLENOID A

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Pinpoint Test B: SSB

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

SSB is a VFS. The PCM controls current flow through the solenoid ground input.

NOTE: Without a voltage signal return to the PCM, the transmission solenoid power control relay is commanded off. Using a fused jumper wire between a transmission solenoid control circuit and the signal return circuit, the transmission solenoid power control relay circuit supplies power to the transmission solenoids when the ignition is cycled from off to on. Do not use a solenoid control circuit that may be at fault, refer to DTC Charts in this section for a fault listing.

DTC Fault Trigger Conditions

Ford Taurus. Automatic Transmission

    Possible Sources
  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • SSB
  • PCM

PINPOINT TEST B: SHIFT SOLENOID B

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Pinpoint Test C: SSC

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

SSC is a VFS. The PCM controls the current flow through the solenoid ground input.

NOTE: Without a voltage signal return to the PCM, the transmission solenoid power control relay is commanded off. Using a fused jumper wire between a transmission solenoid control circuit and the signal return circuit, the transmission solenoid power control relay circuit supplies power to the transmission solenoids when the ignition is cycled from off to on. Do not use a solenoid control circuit that may be at fault, refer to DTC Charts in this section for a fault listing.

DTC Fault Trigger Conditions

Ford Taurus. Automatic Transmission

    Possible Sources
  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • SSC
  • PCM

PINPOINT TEST C: SHIFT SOLENOID C

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Pinpoint Test D: SSD

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

SSD is a VFS. The PCM controls current flow through the solenoid ground input.

NOTE: Without a voltage signal return to the PCM, the transmission solenoid power control relay is commanded off. Using a fused jumper wire between a transmission solenoid control circuit and the signal return circuit, the transmission solenoid power control relay circuit supplies power to the transmission solenoids when the ignition is cycled from off to on. Do not use a solenoid control circuit that may be at fault, refer to DTC Charts in this section for a fault listing.

DTC Fault Trigger Conditions

Ford Taurus. Automatic Transmission

    Possible Sources
  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • SSD
  • PCM

PINPOINT TEST D: SHIFT SOLENOID D

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Pinpoint Test E: SSE

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

SSE is an On/Off solenoid. The PCM controls current flow through the solenoid ground input.

NOTE: Without a voltage signal return to the PCM, the transmission solenoid power control relay is commanded off. Using a fused jumper wire between a transmission solenoid control circuit and the signal return circuit, the transmission solenoid power control relay circuit supplies power to the transmission solenoids when the ignition is cycled from off to on. Do not use a solenoid control circuit that may be at fault, refer to DTC Charts in this section for a fault listing.

DTC Fault Trigger Conditions

Ford Taurus. Automatic Transmission

    Possible Sources
  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • SSE
  • PCM

PINPOINT TEST E: SHIFT SOLENOID E

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Pinpoint Test F: TRANSMISSION SOLENOID POWER CONTROL

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

The transmission solenoid power control relay controls vehicle power to all solenoids. Power is routed through the transmission solenoid power control relay (inside the PCM) to all transmission solenoids. If the power circuit to the transmission solenoids or the transmission solenoid power control relay fails open, all solenoids are failed electrically off. Check for open, short to ground or the transmission connector disconnected. The transmission solenoid power control relay disables power to the transmission solenoids when certain transmission DTCs are set.

NOTE: Without a voltage signal return to the PCM, the transmission solenoid power control relay is commanded off. Using a fused jumper wire between a transmission solenoid control circuit and the signal return circuit, the transmission solenoid power control relay circuit supplies power to the transmission solenoids when the ignition is cycled from off to on. Do not use a solenoid control circuit that may be at fault, refer to DTC Charts in this section for a fault listing.

DTC Fault Trigger Conditions

Ford Taurus. Automatic Transmission

    Possible Sources
  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • PCM

PINPOINT TEST F: TRANSMISSION SOLENOID POWER CONTROL

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Pinpoint Test G: TFT

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

The TFT sensor is located in the transmission solenoid body. The resistance value of the TFT sensor varies with temperature change. The PCM monitors the voltage drop across the TFT sensor to determine the temperature of the transmission fluid. When the ignition is turned to the RUN position, the PCM uses this initial input signal to determine whether a cold start shift schedule is necessary. The cold start shift schedule allows delayed shifts when the transmission fluid is cold. The PCM inhibits TCC operation at low transmission fluid temperatures and adjusts line pressure to temperature.

DTC Fault Trigger Conditions

Ford Taurus. Automatic Transmission

    Possible Sources
  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • TFT sensor
  • PCM

PINPOINT TEST G: TRANSMISSION FLUID TEMPERATURE SENSOR

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Pinpoint Test H: TCC

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

The TCC solenoid is used in the transmission control system to control the application, modulation and release of the torque converter.

NOTE: Without a voltage signal return to the PCM, the transmission solenoid power control relay is commanded off. Using a fused jumper wire between a transmission solenoid control circuit and the signal return circuit, the transmission solenoid power control relay circuit supplies power to the transmission solenoids when the ignition is cycled from off to on. Do not use a solenoid control circuit that may be at fault, refer to DTC Charts in this section for a fault listing.

DTC Fault Trigger Conditions

Ford Taurus. Automatic Transmission

    Possible Sources
  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • TCC solenoid
  • PCM

PINPOINT TEST H: TORQUE CONVERTER CLUTCH SOLENOID

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Pinpoint Test I: PCA

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

The PCA ( LPC solenoid) is a VFS. The PCA solenoid is an electro-hydraulic actuator combining a solenoid and a regulating valve. It supplies the pressure which regulates transmission line pressure. This is done by producing resisting forces to the main regulator and line modulator circuits. These 2 pressures control clutch application pressures.

NOTE: Without a voltage signal return to the PCM, the transmission solenoid power control relay is commanded off. Using a fused jumper wire between a transmission solenoid control circuit and the signal return circuit, the transmission solenoid power control relay circuit supplies power to the transmission solenoids when the ignition is cycled from off to on. Do not use a solenoid control circuit that may be at fault, refer to DTC Charts in this section for a fault listing.

DTC Fault Trigger Conditions

Ford Taurus. Automatic Transmission

    Possible Sources
  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • PCA
  • PCM

PINPOINT TEST I: PRESSURE CONTROL SOLENOID A

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Pinpoint Test J: TR sensor

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

The TR sensor is a 6-pin connector located inside the transmission at the manual control lever. The TR sensor sends a signal to the PCM to start the vehicle when the manual control lever is in PARK or NEUTRAL. The TR sensor contains 4 switches that are monitored by the PCM to determine the manual control lever position.

DTC Fault Trigger Conditions

Ford Taurus. Automatic Transmission

    Possible Sources
  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • TR sensor
  • PCM

PINPOINT TEST J: TRANSMISSION RANGE SENSOR

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Pinpoint Test K: TSS sensor

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

The TSS sensor is a Hall-effect sensor that sends a signal to the PCM that indicates transmission turbine shaft input speed. The TSS sensor provides converter turbine speed information for TCC strategy.

DTC Fault Trigger Conditions

Ford Taurus. Automatic Transmission

    Possible Sources
  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • TSS sensor
  • PCM

PINPOINT TEST K: TURBINE SHAFT SPEED SENSOR

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Pinpoint Test L: OSS sensor

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

The OSS sensor is a Hall-effect sensor that sends a signal to the PCM that indicates transmission output shaft speed. The OSS sensor is used for TCC control and shift scheduling.

DTC Fault Trigger Conditions

Ford Taurus. Automatic Transmission

    Possible Sources
  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • OSS sensor
  • PCM

PINPOINT TEST L: OUTPUT SHAFT SPEED SENSOR

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Pinpoint Test 3.5L GTDI

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

  • Carry out OBD procedures KOEO and KOER.
  • Using the scan tool, retrieve all DTCs.
  • Repair all non-transmission DTCs first.
  • Repair all transmission DTCs second.
  • Clear all CMDTCs and attempt to repeat them.
  • Repair all CMDTCs.
  • If only pass codes are obtained, refer to Component Tests in this section for further information and diagnosis.

Power is routed through the transmission solenoid power control relay (inside the PCM) to all transmission solenoids. If the power circuit to the transmission solenoids or the transmission solenoid power control relay fails open, all solenoids are failed electrically off. Check for open, short to ground or the transmission connector disconnected. The transmission solenoid power control relay disables power to the transmission solenoids when certain transmission DTCs are set.

Follow the diagnostic sequence to diagnose and repair the concern the first time.

Pinpoint Test M: SSA

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

SSA is a VFS. The PCM controls current flow through the solenoid ground input.

NOTE: Without a voltage signal return to the PCM, the transmission solenoid power control relay is commanded off. Using a fused jumper wire between a transmission solenoid control circuit and the signal return circuit, the transmission solenoid power control relay circuit supplies power to the transmission solenoids when the ignition is cycled from off to on. Do not use a solenoid control circuit that may be at fault, refer to DTC Charts in this section for a fault listing.

DTC Fault Trigger Conditions

Ford Taurus. Automatic Transmission

    Possible Sources
  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • SSA
  • PCM

PINPOINT TEST M: SHIFT SOLENOID A

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Pinpoint Test N: SSB

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

SSB is a VFS. The PCM controls current flow through the solenoid ground input.

NOTE: Without a voltage signal return to the PCM, the transmission solenoid power control relay is commanded off. Using a fused jumper wire between a transmission solenoid control circuit and the signal return circuit, the transmission solenoid power control relay circuit supplies power to the transmission solenoids when the ignition is cycled from off to on. Do not use a solenoid control circuit that may be at fault, refer to DTC Charts in this section for a fault listing.

DTC Fault Trigger Conditions

Ford Taurus. Automatic Transmission

    Possible Sources
  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • SSB
  • PCM

PINPOINT TEST N: SHIFT SOLENOID B

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Pinpoint Test O: SSC

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

SSC is a VFS. The PCM controls the current flow through the solenoid ground input.

NOTE: Without a voltage signal return to the PCM, the transmission solenoid power control relay is commanded off. Using a fused jumper wire between a transmission solenoid control circuit and the signal return circuit, the transmission solenoid power control relay circuit supplies power to the transmission solenoids when the ignition is cycled from off to on. Do not use a solenoid control circuit that may be at fault, refer to DTC Charts in this section for a fault listing.

DTC Fault Trigger Conditions

Ford Taurus. Automatic Transmission

    Possible Sources
  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • SSC
  • PCM

PINPOINT TEST O: SHIFT SOLENOID C

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Pinpoint Test P: SSD

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

SSD is a VFS. The PCM controls current flow through the solenoid ground input.

NOTE: Without a voltage signal return to the PCM, the transmission solenoid power control relay is commanded off. Using a fused jumper wire between a transmission solenoid control circuit and the signal return circuit, the transmission solenoid power control relay circuit supplies power to the transmission solenoids when the ignition is cycled from off to on. Do not use a solenoid control circuit that may be at fault, refer to DTC Charts in this section for a fault listing.

DTC Fault Trigger Conditions

Ford Taurus. Automatic Transmission

    Possible Sources
  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • SSD
  • PCM

PINPOINT TEST P: SHIFT SOLENOID D

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Pinpoint Test Q: SSE

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

SSE is an On/Off solenoid. The PCM controls current flow through the solenoid ground input.

NOTE: Without a voltage signal return to the PCM, the transmission solenoid power control relay is commanded off. Using a fused jumper wire between a transmission solenoid control circuit and the signal return circuit, the transmission solenoid power control relay circuit supplies power to the transmission solenoids when the ignition is cycled from off to on. Do not use a solenoid control circuit that may be at fault, refer to DTC Charts in this section for a fault listing.

DTC Fault Trigger Conditions

Ford Taurus. Automatic Transmission

    Possible Sources
  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • SSE
  • PCM

PINPOINT TEST Q: SHIFT SOLENOID E

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Pinpoint Test R: Transmission solenoid power control

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

The transmission solenoid power control relay controls vehicle power to all solenoids. Power is routed through the transmission solenoid power control relay (inside the PCM) to all transmission solenoids. If the power circuit to the transmission solenoids or the transmission solenoid power control relay fails open, all solenoids are failed electrically off. Check for open, short to ground or the transmission connector disconnected. The transmission solenoid power control relay disables power to the transmission solenoids when certain transmission DTCs are set.

NOTE: Without a voltage signal return to the PCM, the transmission solenoid power control relay is commanded off. Using a fused jumper wire between a transmission solenoid control circuit and the signal return circuit, the transmission solenoid power control relay circuit supplies power to the transmission solenoids when the ignition is cycled from off to on. Do not use a solenoid control circuit that may be at fault, refer to DTC Charts in this section for a fault listing.

DTC Fault Trigger Conditions

Ford Taurus. Automatic Transmission

    Possible Sources
  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • PCM

PINPOINT TEST R: TRANSMISSION SOLENOID POWER CONTROL

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Pinpoint Test S: TFT sensor

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

The TFT sensor is located in the transmission solenoid body. The resistance value of the TFT sensor varies with temperature change. The PCM monitors the voltage drop across the TFT sensor to determine the temperature of the transmission fluid. When the ignition is turned to the RUN position, the PCM uses this initial input signal to determine whether a cold start shift schedule is necessary. The cold start shift schedule allows delayed shifts when the transmission fluid is cold. The PCM inhibits TCC operation at low transmission fluid temperatures and adjusts line pressure to temperature.

DTC Fault Trigger Conditions

Ford Taurus. Automatic Transmission

    Possible Sources
  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • TFT sensor
  • PCM

PINPOINT TEST S: TRANSMISSION FLUID TEMPERATURE SENSOR

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Pinpoint Test T: TCC

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

The TCC solenoid is used in the transmission control system to control the application, modulation and release of the torque converter.

NOTE: Without a voltage signal return to the PCM, the transmission solenoid power control relay is commanded off. Using a fused jumper wire between a transmission solenoid control circuit and the signal return circuit, the transmission solenoid power control relay circuit supplies power to the transmission solenoids when the ignition is cycled from off to on. Do not use a solenoid control circuit that may be at fault, refer to DTC Charts in this section for a fault listing.

DTC Fault Trigger Conditions

Ford Taurus. Automatic Transmission

    Possible Sources
  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • TCC solenoid
  • PCM

PINPOINT TEST T: TORQUE CONVERTER CLUTCH SOLENOID

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Pinpoint Test U: PCA

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

The PCA ( LPC solenoid) is a VFS. The PCA is an electro-hydraulic actuator combining a solenoid and a regulating valve. It supplies the pressure which regulates transmission line pressure. This is done by producing resisting forces to the main regulator and line modulator circuits.

NOTE: Without a voltage signal return to the PCM, the transmission solenoid power control relay is commanded off. Using a fused jumper wire between a transmission solenoid control circuit and the signal return circuit, the transmission solenoid power control relay circuit supplies power to the transmission solenoids when the ignition is cycled from off to on. Do not use a solenoid control circuit that may be at fault, refer to DTC Charts in this section for a fault listing.

DTC Fault Trigger Conditions

Ford Taurus. Automatic Transmission

    Possible Sources
  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • PCA
  • PCM

PINPOINT TEST U: LINE PRESSURE CONTROL SOLENOID

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Pinpoint Test V: TR sensor

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

The TR sensor is a 6-pin connector located inside the transmission at the manual control lever. The TR sensor sends a signal to the PCM to start the vehicle when the manual control lever is in PARK or NEUTRAL. The TR sensor contains 4 switches that are monitored by the PCM to determine the manual control lever position.

DTC Fault Trigger Conditions

Ford Taurus. Automatic Transmission

    Possible Sources
  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • TR sensor
  • PCM

PINPOINT TEST V: TRANSMISSION RANGE SENSOR

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Pinpoint Test W: TSS sensor

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

The TSS sensor is a Hall-effect sensor that sends a signal to the PCM that indicates transmission turbine shaft input speed. The TSS sensor provides converter turbine speed information for TCC strategy.

DTC Fault Trigger Conditions

Ford Taurus. Automatic Transmission

    Possible Sources
  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • TSS sensor
  • PCM

PINPOINT TEST W: TURBINE SHAFT SPEED SENSOR

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Pinpoint Test X: OSS sensor

Diagnostic Overview

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Section 100-00 for information about these practices.

Refer to Wiring Diagrams Cell 29 for schematic and connector information.

Normal Operation and Fault Conditions

The OSS sensor is a hall-effect sensor that sends a signal to the PCM that indicates transmission output shaft speed. The OSS sensor is used for TCC control and shift scheduling.

DTC Fault Trigger Conditions

Ford Taurus. Automatic Transmission

    Possible Sources
  • Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
  • OSS sensor
  • PCM

PINPOINT TEST X: OUTPUT SHAFT SPEED SENSOR

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Component Tests

Line Pressure Test

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

NOTICE: Carry out the Line Pressure Test prior to carrying out the Stall Speed Test. If the line pressure is low at stall, do not carry out the Stall Speed Test or further transmission damage will occur. Do not maintain WOT in any transmission range for more than 5 seconds.

NOTICE: Do not mistake the transmission fluid drain plug for the line pressure tap plug or the transmission fluid level will be low and will need to be refilled.

This test verifies the line pressure is within specification.

  1. Connect the transmission fluid pressure gauge to the line pressure tap.
  1. Start the engine and check the line pressure. Refer to the Pressure Chart to determine if the line pressure is within specification.

Pressure Chart

Ford Taurus. Automatic Transmission

  1. If the line pressure is not within specification, see the Line Pressure Diagnosis Chart for line pressure concerns.
  1. When the pressure tests are completed, install the line pressure tap plug.
    • Tighten to 9 Nm (80 lb-in).

Line Pressure Diagnosis Chart

Ford Taurus. Automatic Transmission

Stall Speed Test

 WARNING: Block all wheels, set the parking brake and firmly apply the service brake to reduce the risk of vehicle movement during this procedure. Failure to follow these instructions may result in serious personal injury.

NOTICE: Carry out Line Pressure Test prior to carrying out Stall Speed Test. If the line pressure is low at stall, do not carry out Stall Speed Test or further transmission damage will occur.

The Stall Speed Test checks:

  • TCC operation and installation.
  • holding ability of the forward clutch.
  • low/reverse clutch.
  • planetary OWC.
  • engine driveability concerns.

Conduct this test with the engine coolant and transmission fluid at correct levels and at normal operating temperature.

Apply the park brake firmly for each Stall Speed Test.

Stall Speed Chart

Ford Taurus. Automatic Transmission

  1. Connect the scan tool.
  1. NOTE: If the recorded rpm exceeds the maximum limits, release the accelerator pedal immediately because clutch slippage is indicated.

    In each of the following ranges Drive, Low and Reverse, press the accelerator pedal to the floor and hold it just long enough to let the engine get to WOT. While conducting this test, do not hold the throttle open for more than 5 seconds each time.

  1. Record the results in each range.
  1. After each range, move the selector lever to NEUTRAL and run the engine at 1,000 rpm for 15 seconds to cool the torque converter before conducting the next test.
  1. Use the Stall Speed Diagnosis Chart for corrective actions.
  1. NOTE: The stall speed in REVERSE will be lower.

    If stall speeds were too high, see the Stall Speed Diagnosis Chart. If stall speeds were too low, first check engine idle speed and tune up. If engine is OK, remove torque converter and check for slippage.

Stall Speed Diagnosis Chart

Ford Taurus. Automatic Transmission

Leakage Inspection

NOTE: When diagnosing transmission leaks, the source of the leak must be positively identified prior to repair. If the vehicle is driven extensively between adding the fluorescent additive and performing the leak test, the leaking oil can spread and make identifying the location of the leak difficult.

  1. Clean off any transmission fluid from the top and bottom of the torque converter housing, the front of the case and rear face of the engine and oil pan. Clean the torque converter area by washing with a nonflammable solvent and blow dry with compressed air.
  1. Add Dye-Lite ATF Power Steering Fluid Leak Detection Dye to the transmission fluid. Use one 30 ml (1 fl. oz) of dye solution for every 3.8 L (4 qt) of transmission fluid.
  1. Start and run the engine until the transmission reaches its normal operating temperature. Raise the vehicle on a hoist and run the engine occasionally shifting to the DRIVE and REVERSE ranges to increase pressure within the transmission. Using a black light, observe the back of the cylinder block and top of the torque converter housing for evidence of fluid leakage. Run the engine until transmission fluid leakage is evident and the probable source of leakage can be determined.

Ford Taurus. Automatic Transmission

  1. If the source of the leak is obvious, repair as required. Leaks from the torque converter housing can originate from several locations. The paths which the fluid takes to reach the bottom of the torque converter housing are shown in the illustration. The 5 steps following correspond with the numbers in the illustration.
    1. Transmission fluid leaking by the converter hub seal lip will tend to move along the drive hub and onto the back of the torque converter. Except in the case of a total seal failure, transmission fluid leakage by the lip of the seal will be deposited on the inside of the torque converter housing only, near the outside diameter of the housing.
    1. Transmission fluid leakage by the outside diameter of the converter impeller hub seal and the case will follow the same path that leaks by the ID of the converter hub seal follow.
    1. Transmission fluid leakage from the converter cover weld or the converter-to-flexplate stud weld will appear at outside diameter of torque converter on the back face of the flexplate and in the converter housing only near the flexplate. If a converter-to-flexplate lug, lug weld or converter cover weld leak is suspected, remove the converter and pressure check.
    1. Transmission fluid leakage from the bolts inside the converter housing will flow down the back of the torque converter housing. Leakage may be from loose or missing bolts.
    1. Engine oil leaks from the rear main oil.
  1. Remove the torque converter.
  1. Using a black light, observe the torque converter housing. Inspect for evidence of dye from the pump bolts, pump seal, and torque converter hub seal. Repair as required.
  1. If the source of the leak is not evident, continue with this procedure to leak test the torque converter.
  1. Install the torque converter in the arbor press. Support the torque converter on the mounting pads.

Ford Taurus. Automatic Transmission

  1. Install the Leak Tester, Torque Converter 307-421 into the torque converter hub.

Ford Taurus. Automatic Transmission

  1. Secure the press. Apply enough force from the press to seal of the Leak Tester, Torque Converter 307-421 into the torque converter hub.

Ford Taurus. Automatic Transmission

  1. Connect a compressed air supply to the Leak Tester, Torque Converter 307-421.

Ford Taurus. Automatic Transmission

  1. With air pressure applied to the valve, inspect for leaks at the converter hub weld and seams. A soap bubble solution can be applied around those areas to aid in the diagnosis. If any leaks are present, install a new torque converter.

Ford Taurus. Automatic Transmission

  1. With air pressure applied to the valve, inspect for leaks at the stud or mounting pad and balance weight welds. A soap bubble solution can be applied around those areas to aid in the diagnosis. If any leaks are present, install a new torque converter.

Ford Taurus. Automatic Transmission

  1. After leaks are repaired, clean remaining transmission fluid dye from serviced areas.

Forward Clutch System

For forward (1,2,3,4) clutch operation, REFER to Hydraulic System or Mechanical System.

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Forward Clutch

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Direct Clutch System

For direct clutch operation, REFER to Hydraulic System or Mechanical System.

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Direct Clutch System

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Intermediate Clutch System

For intermediate clutch operation, REFER to Hydraulic System or Mechanical System.

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Intermediate Clutch System

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Low/Reverse Clutch System

For low/reverse clutch operation, REFER to Hydraulic System or Mechanical System.

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Low/Reverse Clutch System

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Overdrive Clutch System

For overdrive clutch system operation, REFER to Hydraulic System or Mechanical System.

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Overdrive Clutch System

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

Low One Way Clutch

For low OWC system operation REFER to Hydraulic System or Mechanical System.

Ford Taurus. Automatic Transmission

Ford Taurus. Automatic Transmission

NOTICE: Do not clean in water or with water-based solvents. Damage to the component may occur.

NOTE: The low OWC cannot be disassembled.

Clean and inspect the low OWC for cracks and damaged splines. The internal splined section should rotate counterclockwise and lock when rotated clockwise. If any damage is found or the clutch does not rotate or lock, INSTALL a new low OWC.

Ford Taurus. Automatic Transmission

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