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Torque Converter Diagnosis

WARNING: This page is about a different car, the 2004 Ford RV Cutaway, 2004 Ford Econoline, and 2004 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

Prior to torque converter installation, all diagnostic procedures must be followed. This is to prevent the unnecessary installation of good torque converters. Only after a complete diagnostic evaluation can the decision be made to install a new torque converter.

Begin with the normal diagnostic procedures as follows:

  1. Preliminary Inspection.
  2. Know and understand the customer's concern.
  3. Verify the condition - carry out the torque converter operation test.
  4. Carry out diagnostic procedures.
    • Carry out on-board diagnostics; refer to DIAGNOSTICS .
      • Repair all non-transmission related DTCs first.
      • Repair all transmission DTCs.
      • Rerun on-board diagnostic to verify repair.
    • Carry out LINE PRESSURE TEST . Refer to SPECIAL TESTING PROCEDURES .
    • Carry out STALL SPEED TEST . Refer to SPECIAL TESTING PROCEDURES .
    • Carry out DIAGNOSTIC ROUTINES . Refer to DIAGNOSIS BY SYMPTOM .
      • Use the Diagnosis by Symptom Index to locate the appropriate routine that best describes the symptom(s). The routine will list all possible components that may cause or contribute to the symptom. Check each component listed; diagnose and repair as required before changing the torque converter.

    TORQUE CONVERTER OPERATION TEST 

    This test verifies that the torque converter clutch control system and the torque converter are operating correctly.

  5. Carry out Quick Test with diagnostic tool. Refer to the appropriate INTRODUCTION article. Check for DTCs.
  6. Connect a tachometer to the engine.
  7. Bring the engine to normal operating temperature by driving the vehicle at highway speeds for approximately 15 minutes in (D) position.
  8. 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.
  9. Engine RPM should increase when brake pedal is tapped, and decrease about five seconds after pedal is released. If this does not occur, see torque converter operation concerns. Refer to DIAGNOSIS BY SYMPTOM .
  10. 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, see torque converter operation concerns. Refer to DIAGNOSIS BY SYMPTOM . If the vehicle does not stall in (D), refer to DIAGNOSIS BY SYMPTOM .
  11. If the vehicle exhibits a vibration during the road test, complete the Road Test Evaluation Form. This form will aid the technician in determining the source of the vibration.
NOTE: The following is a list of common vehicle concerns that have been misdiagnosed as torque converter clutch shudder. For diagnosis of the following items, refer to the appropriate INTRODUCTION article.
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