Torque Converter Clutch Operation Test
WARNING: This page is about a different car, the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, 2003 Ford Excursion, and 2003 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
This test verifies that the torque converter clutch control system and the torque converter are operating correctly.
- Carry out Quick Test, refer to ON-BOARD DIAGNOSTICS WITH SCAN TOOL . Check for DTCs, refer to the diagnostic trouble code chart. See DIAGNOSTIC TROUBLE CODE CHART .
- Connect a tachometer to the engine.
- Bring the engine to normal operating temperature by driving the vehicle at highway speeds for approximately 15 minutes in (D) position.
- 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.
- 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. See DIAGNOSTIC ROUTINES .
- 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. See DIAGNOSTIC ROUTINES . Repair as required. If the vehicle does not stall in (D), refer to DIAGNOSIS BY SYMPTOM .
NOTE:
For 7.3L diesel applications: Tapping the brake pedal in fourth gear during an open throttle condition will not disengage the Torque Converter Clutch (TCC). The TCC will disengage during a 4-3 coast downshift.