Torque Converter Operation Test

This test verifies that the torque converter clutch control system and the torque converter are operating correctly.

1. Carry out the Quick Test. See On-Board Diagnostics with scan tool. Refer to Diagnostics . Check for DTCs. Refer to the Diagnostic Trouble Code (DTC) Charts .
2. Bring the engine to normal operating temperature by driving the vehicle at highway speeds for approximately 15 minutes in Overdrive (Circle D) position.
3. 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.
4. The engine RPM should increase when the brake pedal is tapped, and decrease about 5 seconds after the pedal is released. If this does not occur, refer to Torque Converter Operation Concerns in Diagnosis By Symptom .
5. If the vehicle stalls in Overdrive (Circle D) or manual 2 at idle with vehicle at a stop, move the transmission selector lever to manual 1 position. If the vehicle stalls, refer to Diagnosis By Symptom , Torque Converter Operation Concerns. Repair as necessary. If the vehicle does not stall in Overdrive (Circle D), refer to Diagnosis By Symptom .