Torque Converter

This test verifies that the torque converter clutch control system and the torque converter are operating properly.
1. Perform Quick Test.
- Check for DTCs P0741, P1741, P0743, P1742, P1743 and P1744.
- Refer to Pinpoint Test C for diagnosis.
2. Connect a tachometer to engine.
3. Bring engine to normal operating temperature by driving vehicle at highway speeds for approximately 15 minutes in OD 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 five seconds after pedal is released. If this does not occur, refer to Torque Converter Operation Concerns in Diagnostic Routines.
6. If vehicle stalls in OD or manual 2 at idle with vehicle at a stop, move transmission range selector lever to manual 1 position. If vehicle stalls, refer to Torque Converter Operation Concerns in Diagnostic Routines. Symptom Related Diagnostic Procedures
Service as required.
If vehicle does not stall in OD, refer to electrical diagnostics for PCM and vehicle harness diagnosis in Pinpoint Test C.