Navigator 4WD V8-5.4L SOHC VIN L (1998)
Torque Converter Clutch: Testing and Inspection
This test verifies that the torque converter clutch control system and the torque converter are operating properly.
1. Perform Quick Test; refer to On-Board Diagnostics with NGS. Check for DTCs; Refer to the Diagnostic Trouble Code Chart.
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. 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 Index.
6. 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 Torque Converter Clutch Operation Concerns in the Diagnosis by Symptom Index. Repair as required. If the vehicle does not stall in
(D), refer to Diagnosis by Symptom Index.
