Torque Converter Diagnosis

Torque Converter Diagnosis
Prior to installing a new torque converter, 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 or remanufactured 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 Clutch Operation Test. Torque Converter Operation Test
4. Carry out Diagnostic Procedures.
^ Run on-board diagnostics. See On-Board Diagnostics with scan tool. Refer to Diagnostics.
- Repair all non-transmission related DTCs first.
- Repair all transmission DTCs.
- Rerun on-board diagnostic to verify repair.
^ Carry out the Line Pressure Test. Refer to Special Testing Procedures. Special Testing Procedures
^ Carry out the Stall Speed Test. Stall Speed Test
^ Carry out the Diagnosis by Symptom Index. 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 service as necessary before servicing the torque converter.