Torque Converter Operations Test

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

1. Carry out the Quick Test. Refer to ON-BOARD DIAGNOSTICS WITH SCAN TOOL  in this article. Check for DTCs. Refer to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS  in this article.
2. Connect a tachometer to the engine.
3. Bring the engine to normal operating temperature by driving the vehicle at highway speeds for approximately 15 minutes in 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, refer to TORQUE CONVERTER OPERATION CONCERNS  in the Diagnosis by Symptom Index.
6. If the vehicle stalls in O/D or manual 2 at idle with vehicle at a stop, move the position selector lever to manual 1 position. If the vehicle stalls, refer to TORQUE CONVERTER OPERATION CONCERNS  in the Diagnosis by Symptom article. Repair as necessary. If the vehicle does not stall in O/D position, refer to DIAGNOSIS BY SYMPTOM  in this article.