Diagnostic Routine E

Diagnostic Routine E

Diagnostic Overview

P0740, P0742, P0743, P0744

Refer to Wiring Diagram Set 29 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

The TCC (Torque Converter Clutch) solenoid is used in the transaxle control system to control the application, modulation and release of the torque converter clutch.

DTC Fault Trigger Conditions






Pinpoint Test

NOTE: If the scan tool is unable to communicate with the PCM (Powertrain Control Module) or access the transmission PIDs (Parameter Identifications), REFER to Computers and Control Systems Information.

1. Read and record all DTCs (Diagnostic Trouble Codes)

1. Install the scan tool and record all DTCs (Diagnostic Trouble Codes).

Were DTCs (Diagnostic Trouble Codes) P0740, P0742, P0743 and/or P0744 set?






2. Check the TCC (Torque Converter Clutch) solenoid circuit for an open

1. Ignition OFF.

2. Disconnect the transaxle vehicle harness C168.

3. Disconnect the PCM (Powertrain Control Module) C175T.

4. Inspect the connectors for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.

5. Measure the resistance of circuit CET10 (BU/GY) from the transaxle vehicle harness C168-14 to the PCM (Powertrain Control Module) C175T-46.





Is the resistance less than 5 ohms?






3. Check the TCC (Torque Converter Clutch) for an open

1. Measure the resistance between the transaxle internal harness, terminal 14 and terminal 15 component side.





Is the resistance between 4.0 and 7.2 ohms?






4. Check the TCC (Torque Converter Clutch) circuit for a short to ground

1. Ignition OFF.

2. Disconnect the transaxle vehicle harness C168.

3. Disconnect the PCM (Powertrain Control Module) C175T.

4. Inspect the connectors for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.

5. Measure the resistance of circuit CET10 (BU/GY) from the transaxle vehicle harness C168-14 to ground.





Is the resistance greater than 10,000 ohms?






5. Check the TCC (Torque Converter Clutch) for a short to ground

1. Measure the resistance between the transaxle internal harness connector, terminal 14 and ground.





Is the resistance less than 5 ohms?






6. Check the TCC (Torque Converter Clutch) circuit for a short to voltage

1. Ignition OFF.

2. Disconnect the transaxle vehicle harness C168.

3. Disconnect the PCM (Powertrain Control Module) C175T.

4. Inspect the connectors for damaged or pushed out terminals, corrosion, loose wires and missing or damaged seals.

5. Ignition ON.

6. Measure for voltage on circuit CET10 (BU/GY) from the transaxle vehicle harness C168-14 to ground.





Is any voltage present?