Torque Converter Diagnosis

5R44E and 5R55E

Torque Converter Diagnosis

Prior to installing new or remanufactured torque converters, 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 Customer's Concern.

3. Verify the Concern. Refer to the Torque Converter Operation Test. Torque Converter Operation Test

4. Carry out Diagnostic Procedures.

- Run On-Board Diagnostic (OBD). Refer to the On-Board Diagnostic (OBD) With Scan Tool.
- Repair all non-transmission related DTCs first.
- Repair all transmission DTCs.
- Rerun OBD test to verify repair.

- Carry out Line Pressure Test. Refer to the Special Testing Procedures Line Pressure Test Special Testing Procedures.
- Carry out Stall Speed Test. Refer to the Special Testing Procedures Stall Speed Test Special Testing Procedures.
- Carry out Diagnosis by Symptom Index. Refer to Diagnosis By Symptom 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 required before servicing the torque converter.