Explorer 4WD V6-4.0L (2009)
Torque Converter: Testing and Inspection
6R80
Torque Converter Diagnosis
Torque Converter Diagnosis
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 concern.
3. Verify the condition - carry out the Torque Converter Operation Test.
4. Perform diagnostic procedures.
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Perform On-Board Diagnostic (OBD) test. Refer to Diagnostics See: Transmission Control Systems/Testing and Inspection/Initial Inspection and
Diagnostic Overview/6R80/Diagnostics.
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Repair all non-transmission related DTCs first.
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Repair all transmission-related DTCs.
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Rerun OBD test to verify repair.
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Perform Stall Speed Test. Refer to Special Testing Procedures See: Transmission Control Systems/Testing and Inspection/Component Tests and
General Diagnostics/6R80/Special Testing Procedures.
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Perform Diagnostic Routines. Refer to Diagnosis By Symptom. See: Transmission Control Systems/Testing and Inspection/Symptom Related
Diagnostic Procedures/6R80/Diagnostic Routines See: Transmission Control Systems/Testing and Inspection/Symptom Related Diagnostic
Procedures/6R80/Diagnosis By Symptom
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Use the Diagnosis by Symptom 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
The Torque Converter Operation Test verifies that the Torque Converter Clutch (TCC) control system and the torque converter are operating correctly.
1. Perform a Self Test with the scan tool. Refer to Computers and Control Systems Information. Check for DTCs.
2. Connect a scan tool to the vehicle.
3. Bring the engine to normal operating temperature by driving the vehicle at highway speeds in the (D) position.
4. After normal operating temperature is reached, maintain a constant speed of about 56 km/h (35 mph) in 5th gear for 10 seconds.
5. Release the accelerator pedal and monitor the scan tool Throttle Position (TP) voltage to approximately 1.25 volts or 25% throttle.
6. Monitor the TCC and RPM TCM PID. The TCC should release and engine rpms should increase before the 5-4 shift occurs.
NOTE: The following is a list of common vehicle concerns that have been misdiagnosed as TCC shudder. For diagnosis of the following items, refer to
the appropriate systems of the diagnostic/repair information and Computers and Control Systems Information.
