Torque Converter Operation Test

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. Check for DTCs. Refer to the Diagnostic Trouble Code Charts. Testing and Inspection
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 D5 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. The engine rpm should increase when brake pedal is tapped, and decrease about five seconds after pedal is released. If this does not occur, see Torque Converter Operation Concerns, Diagnosis by Symptom.
6. If the vehicle stalls in D5 or manual 2 at idle with vehicle at a stop, move the transmission range selector lever to manual 1 position. If the vehicle stalls, see Torque Converter Operation Concerns, Diagnosis by Symptom. Repair as necessary. If the vehicle does not stall in D5, refer to Diagnosis by Symptom. 5R55N