F 150 4WD Pickup V8-281 4.6L VIN W EFI (1997)
Torque Converter Clutch: Testing and Inspection
Operation Test
This test verifies that the torque converter clutch control system and the torque converter are operating properly.
1. Perform Quick Test as outlined. Check for DTCs P0741, P1741, P0743, P1742, P1743, P1744, P1767 and P1740. Refer to Pinpoint Test C for
diagnosis.
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 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 Clutch Operation Concerns in the Diagnosis by Symptom Chart.
6. If the vehicle stalls in OD 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 Torque Converter Clutch Operation Concerns under Torque Converter diagnosis by symptom. Repair as required. If the vehicle
does not stall in OD, refer to electrical diagnosis for the PCM and the vehicle harness diagnosis in Pinpoint Test C.
