Torque Converter Operations Test

Torque Converter Operations Test

This test verifies that the Torque Converter Clutch (TCC) control system and the torque converter are operating correctly.

1. Carry out the Self Test, see On-Board Diagnostics With Scan Tool, refer to Diagnostics Diagnostics. Check for DTCs. Refer to Diagnostic Trouble Code (DTC) Charts 4F27E.

2. Monitor ECT, TFT and RPM PIDs.

3. Bring the engine to normal operating temperature by driving the vehicle at highway speeds for approximately 15 minutes in Overdrive (O/D) position.

4. After normal operating temperature is reached, maintain a constant vehicle speed of about 80 km/h (50 mph) and tap the brake pedal with the left foot.

5. The engine rpm should increase when brake pedal is tapped, and decrease about 5 seconds after pedal is released. If this does not occur, see Torque Converter Operation Concerns. Refer to Diagnosis By Symptom Diagnosis By Symptom.

6. If the vehicle stalls in O/D or D at idle with vehicle at a stop, move the selector lever to manual L position. If the vehicle stalls, refer to Torque Converter Operation Concerns in the Diagnosis By Symptom Diagnosis By Symptom. Repair as necessary. If the vehicle does not stall in O/D position, refer to Diagnosis By Symptom Diagnosis By Symptom.