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Torque Converter Clutch Operation Test

WARNING: This page is about a different car, the 2003 Ford RV Cutaway, 2003 Ford Econoline, 2003 Ford E550 Super Duty, 2003 Ford E450 Super Duty, and 2003 Ford Cutaway. 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.

  1. Carry out Quick Test; refer to ON-BOARD DIAGNOSTICS WITH DIAGNOSTIC TOOL . 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. NOTE: Some applications (based on calibrations) may or may not disengage the torque converter clutch at road speeds, above 72 km/h (45 mph) when tapping on the brake. Some applications may or may not disengage the torque converter clutch at road speeds, above 72 km/h (45 mph) with closed throttle.
  4. On the E-550 7.3L diesel the torque converter will remain locked in third and fourth gears at 68 km/h (42 mph) during closed throttle operation.

    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. 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 down shift.
  5. The correct operation of the TCC can be verified by using a scan tool and monitoring the TCC during the 4-3 coast down shift.

    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 the appropriate TORQUE CONVERTER CLUTCH OPERATION CONCERNS  in DIAGNOSTIC ROUTINES .

  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 the appropriate TORQUE CONVERTER CLUTCH OPERATION CONCERNS  in Diagnostic Routines . Repair as required. If the vehicle does not stall in (D), refer to the appropriate TORQUE CONVERTER CLUTCH OPERATION CONCERNS  in DIAGNOSTIC ROUTINES .
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