Torque Converter Diagnosis

Torque Converter Diagnosis
Prior to installing a new or remanufactured 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 torque converter.
Begin with the normal diagnostic procedures as follows:
1. Preliminary inspection.
2. Know and understand the customer s concern.
3. Verify the condition-carry out the torque converter operation test. Torque Converter Operation Test
4. Carry out diagnostic procedures.
- Carry out on-board diagnostics; refer to Diagnostics.
- Repair all non-transmission related DTCs first.
- Repair all transmission DTCs.
- Rerun on-board diagnostic to verily repair.
- Carry out Line Pressure Test. Line Pressure Test
- Carry out Stall Speed Test. Stall Speed Test
- Carry out Diagnostic Routines. 4R70W
- 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 changing the torque converter. Symptom Index (Diagnosis By Symptom Index)