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 Quick Test. Check for DTCs.
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) position.

4. NOTE: The TCC will disengage during a 4-3 coast downshift.

The correct operation of the TCC can be verified by using a scan tool and monitoring the TCC during the 4-3 coast downshift.
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 Diagnosis By Symptom-Torque Converter Clutch Operation Concerns.
5. If the vehicle stalls in (D) or MANUAL 2 at idle with vehicle at a stop, move the transmission range selector lever to MANUAL 1 position. If the vehicle stalls, refer to Diagnosis By Symptom - Torque Converter Clutch Operation Concerns. Repair as required. If the vehicle does not stall in (D), refer to Diagnosis By Symptom. 4R100