Quick Check
- Check level and condition of transaxle fluid. Check PCM memory for stored trouble codes. See GENERAL MOTORS HYDRA-MATIC 4T60-E DIAGNOSIS article in the AUTO TRANS DIAGNOSIS section. If no trouble codes are present, go to next step. If codes are present, diagnose and repair all PCM-related trouble codes. Clear PCM trouble code memory.
- Perform road test. See ROAD TEST under TESTING. During road test, record shift points. If shift point timing or shifting is incorrect, see GENERAL MOTORS HYDRA-MATIC 4T60-E DIAGNOSIS article for 1993 vehicles, or GENERAL MOTORS HYDRA-MATIC 4T60-E DIAGNOSIS article for 1994 vehicles.
- If shift(s) is too harsh or too soft, see procedures for HYDRAULIC PRESSURE TESTS under TESTING.
- For specific complaints, see appropriate condition(s) listed under SYMPTOM DIAGNOSIS .