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Torque Converter Operation Test

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. 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 the Quick Test. See ON-BOARD DIAGNOSTICS  with scan tool. Refer to DIAGNOSTICS . Check for DTCs. Refer to the DIAGNOSTIC TROUBLE CODE (DTC) CHARTS .
  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. The engine rpm should increase when the brake pedal is tapped and decrease about 5 seconds after the pedal is released. If this does not occur, refer to torque converter operation concerns in DIAGNOSIS BY SYMPTOM .
  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 torque converter operation concerns in DIAGNOSIS BY SYMPTOM INDEX . Repair as necessary. If the vehicle does not stall in (D), refer to DIAGNOSIS BY SYMPTOM .
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