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 DTCs found, for future reference.
- Check ATF level and condition.
- Check for add-on items (phones, computers, CB radio etc).
- Visually inspect wiring harness and connector.
- Check for vehicle modifications.
- Verify that the shift linkage is properly adjusted in "OVERDRIVE".
- Verify that TR switch is properly adjusted in "NEUTRAL".
- 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.