Torque Converter Diagnosis

Torque Converter Diagnosis

Prior to torque converter replacement, 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 new or remanufactured torque converters.

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 (TCC) Operation Test. Torque Converter Clutch (TCC) Operation Test

4. Carry out Diagnostic Procedures.
- Run On-Board Diagnostic (OBD) test. Refer to On-Board Diagnostic (OBD) with Scan Tool. Diagnostics
- Repair all non-transmission-related DTCs first.

- Repair all transmission DTCs.

- Rerun OBD test to verify repair.

- Carry out Line Pressure Test. Line Pressure Test

- Carry out Stall Speed Test. Stall Speed Test

- Carry out Diagnostic Routines. Diagnostic Routines
- Use the Diagnosis by Symptom 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.