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; see ON-BOARD DIAGNOSTIC TESTS .
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 D (Overdrive) 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.
   • Engine RPM should increase when brake pedal is tapped, and decrease about five seconds after pedal is released.
   • If this does not occur, see SYMPTOM TROUBLESHOOTING CHART - AUTOMATIC TRANSMISSION  Torque Converter Operation Concerns.
5. If the vehicle stalls in D (Overdrive) 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 SYMPTOM TROUBLESHOOTING CHART - AUTOMATIC TRANSMISSION  Torque Converter Operation Concerns. Repairs required.
   • If the vehicle does not stall in D (Overdrive), see SYMPTOM TROUBLESHOOTING CHART - AUTOMATIC TRANSMISSION  .