Torque Converter Diagnosis: Notes

Prior to installing a new or remanufactured torque converter, all diagnostic procedures must be followed. This is to prevent the unnecessary installation of new or re-manufactured torque converters. Only after a complete diagnostic evaluation can the decision be made to install a new or remanufactured torque converter. Begin with the normal diagnostic procedures as follows:

1. Preliminary Inspection.
2. Know and Understand the Customer's Concern.
3. Verify the Concern - Carry out the Torque Converter Operation Test.
4. Carry out Diagnostic Procedures.
   • Carry out the On-Board Diagnostics.
     • Repair all non-transaxle related DTCs first.
     • Repair all transaxle DTCs.
     • Rerun on-board diagnostics to verify repair.
   • Carry out the Line Pressure Test. See SPECIAL TESTING PROCEDURES .
   • Carry out the Stall Speed Test. See SPECIAL TESTING PROCEDURES .
   • Carry out Diagnosis by Symptom. See DIAGNOSIS BY SYMPTOM .
     • Use the index to locate the appropriate routine that best describes the symptom(s). The routine lists all possible components that may cause or contribute to the symptom. Check each component listed, diagnose and repair as required, before repairing the torque converter.