Preliminary Testing and Diagnosis

PRELIMINARY TESTING AND DIAGNOSIS
Before any diagnostic testing is done on a vehicle some preliminary checks must be performed, as outlined below. Be sure to write down your findings, especially any DTC, for future reference.
- Check ATF level and condition.
- Check for add-on items (phones, computers, CB radio etc).
- Visually inspect wiring harness and connectors.
- Check for vehicle modifications.
- Verify that the shift linkage is properly adjusted.
- Verify customer concern.
- Upshift, Downshift, Coasting, Engagement, Noise/Vibration
- Vehicle must be at normal operating temperature.
- Perform vehicle On-Board Diagnostic Test.
- Record all DTCs.
- Repair all non-transaxle DTCs.