Torque Converter Operation Test

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 A for diagnosis.
2. Connect a tachometer to engine.
3. Bring engine to normal operation temperature by driving 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 five seconds after pedal is released. If this does not occur, refer to Torque Converter Operation Concerns in Diagnosis by Symptom Index.
6. If vehicle stalls in (D) 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. Service as required. If vehicle does not stall in (D), refer to electrical diagnostics for PCM and vehicle harness diagnosis in Pinpoint Test A.