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Torque Converter Operation Test

WARNING: This page is about a different car, the 2005 Lincoln LS. 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 Diagnostic Tool . Refer to DIAGNOSTICS  in this article. Check for DTCs. Refer to the DIAGNOSTIC TROUBLE CODE (DTC) CHARTS  in this article.
  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 the 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 Diagnosis By Symptom, TORQUE CONVERTER OPERATION CONCERNS  in this article. Repair as necessary. If the vehicle does not stall in (D), refer to DIAGNOSIS BY SYMPTOM  in this article.
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