Torque Converter Diagnosis: Notes

Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software with appropriate hardware, or equivalent scan tool

Prior to installing a new torque converter, all diagnostic procedures must be followed. This is to prevent the unnecessary installation of new or remanufactured 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 Concern - Carry out the Torque Converter Operation Test; refer to TORQUE CONVERTER OPERATION TEST  .
4. Carry out Diagnostic Procedures.

• Run On-Board Diagnostic (OBD) With Scan Tool, refer to DIAGNOSTICS  .
  • Repair all non-transaxle related DTCs first.
  • Repair all transaxle DTCs.
  • Rerun OBD to verify repair.
• Carry out the LINE PRESSURE TEST . Refer to SPECIAL TESTING PROCEDURES  .
• Carry out the STALL SPEED TEST . Refer to SPECIAL TESTING PROCEDURES  .
• Carry out the DIAGNOSIS BY SYMPTOM INDEX . Refer to DIAGNOSIS BY SYMPTOM  .
  • Use the 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 necessary before installing a new torque converter.