Torque Converter Operation Test

5R44E and 5R55E

Torque Converter Operation Test

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

1. Carry out Self Test. Refer to the On-Board Diagnostic (OBD) With Scan Tool. Check for DTCs. Refer to the DTC Chart. Diagnostics Diagnostic Trouble Code Tests and Associated Procedures

2. Connect a scan tool and monitor engine rpm.

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

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

5. Engine rpm should increase when brake pedal is tapped, and decrease about 5 seconds after pedal is released. If this does not occur, refer to the Torque Converter Operation Concerns in Diagnosis By Symptom Diagnosis By Symptom.

6. If the vehicle stalls in (D) or manual 2 at idle with vehicle at a stop, move the transmission range selector lever to manual 1 position. If the vehicle stalls, refer to the Torque Converter Operation Concerns in Diagnosis By Symptom Diagnosis By Symptom. Repair as required. If the vehicle does not stall in (D), refer to Diagnosis By Symptom Diagnosis By Symptom.