Torque Converter Diagnosis

Prior to torque converter replacement, all diagnostic procedures must be followed. This is to prevent the unnecessary replacement of good torque converters. Only after a complete diagnostic evaluation can the decision be made to replace the 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 Clutch Operation Test.
4. Carry out Diagnostic Procedures.
- Run on-board diagnostics.
- Repair all non-transmission related DTCs first.
- Repair all transmission DTCs.
- Rerun on-board diagnostic to verify repair.
- Carry out Line Pressure Test. Line Pressure Test
- Carry out Stall Speed Test. Stall Speed Test
- Carry out Diagnosis by Symptom Index. Symptom 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 service as required before servicing the torque converter.