Diagnostic Routine B

Diagnostic Routine B

Diagnostic Overview

P087A, P087B, P087E, P090A, P090B, P090C, P090D

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

Normal Operation and Fault Conditions

Clutch motor 2 is a 3 phase bi-directional DC motor that is controlled by the TCM (Transmission Control Module). The TCM (Transmission Control Module) monitors the clutch motor position using three hall effect sensor inputs.

DTC Fault Trigger Conditions






Pinpoint Test

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

Were DTCs (Diagnostic Trouble Codes) P087A, P087B, P087E, P090A, P090B, P090C and/or P090D set?






2. NOTE: Clutch motor hall effect supply voltage should measure 5.1 volts with the ignition switch in the Run position.
Check hall effect supply voltage

1. Ignition OFF.

2. Disconnect clutch motor C1634.

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

4. Ignition ON

5. Measure for voltage on the hall effect supply voltage circuit (WH/PK) from the transaxle vehicle harness C1634-1 to ground.





Is voltage is greater than 5.2 volts?






3. Check the hall effect supply voltage circuit for an open

1. Disconnect TCM (Transmission Control Module) harness C1750B.

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

3. Measure the resistance of the hall effect supply voltage circuit (WH/PK) from the transaxle vehicle harness C1634-1 to TCM (Transmission Control Module) C1750B-55.





Is the resistance less than 5 ohms?






4. Check the hall effect supply voltage circuit for a short to ground

1. Measure the resistance of the hall effect supply voltage circuit (WH/PK) for from the transaxle vehicle harness C1634-1 to ground.





Is the resistance greater than 10,000 ohms?






5. Check the hall effect supply voltage circuit for a short to power

1. Ignition OFF

2. Disconnect TCM (Transmission Control Module) harness C1750B.

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

4. Ignition ON.

5. Measure for voltage on the hall effect supply voltage circuit (WH/PK) from the transaxle vehicle harness C1634-1 to ground.





Is voltage greater than 5.2 volts?






6. Run Component Test

1. Run the Component Test, REFER to Clutch - 2 Clutch - 2.

Did DTCs (Diagnostic Trouble Codes) P087A, P087B and/or P087E set?






7. Check the clutch motor 3 phase circuits for an open

1. Ignition OFF.

2. Disconnect TCM (Transmission Control Module) C1750B and clutch motor C1634.

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

4. Measure the resistance of the 3 phase circuits (WH) from the transaxle vehicle harness C1634 to TCM (Transmission Control Module) C1750B.





Is the resistance less than 5 ohms on all circuits?






8. Check the clutch motor 3 phase circuits for a short to ground

1. Measure the resistance of the 3 phase circuits (WH) from the transaxle vehicle harness C1634 to ground.





Is the resistance greater than 10,000 ohms?






9. Run Component Test

1. Run the Component Test, REFER to Clutch - 2 Clutch - 2.

Did DTCs (Diagnostic Trouble Codes) P090A, P090B, P090C and/or P090D set?