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 remanufactured 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 Customers Concern.
3. Verify the Concern - Carry out the Torque Converter Operation Test.
4. Carry out Diagnostic Procedures.
   • Carry out On-Board Diagnostics. For additional information, refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS .
     • Repair all non-transaxle related DTCs first.
     • Repair all transaxle DTCs.
     • Rerun on-board diagnostics to verify repair.
   • Carry out Line Pressure Test. For additional information, refer to SPECIAL TESTING PROCEDURES  .
   • Carry out Stall Speed Test. For additional information, refer to SPECIAL TESTING PROCEDURES  .
   • Carry out Diagnosis by Symptom Routines. Refer to AUTOMATIC TRANSAXLE TROUBLESHOOTING INDEX 
     • 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 required, before repairing the torque converter.
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