Torque Converter Diagnosis

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:
- Preliminary Inspection
- Know and Understand the Customer's Concern
- Verify the Concern
a. Perform the Torque Converter Clutch Operation Test.
- Perform Diagnostic Procedures
a. Run On-Board Diagnostics.
b. Perform Line Pressure Test.
c. Perform Stall Speed Test.
d. Diagnosis by Symptom Routines.
^ 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.