Before On-Board Diagnostics

Before any diagnostic testing is done on a vehicle some preliminary checks must be performed, as follows. Be sure to note findings, especially any DTCs found, for future reference.
- Check transaxle fluid level and condition.
- Check for add-on items (phones, computers, CB radio, etc).
- Visually inspect wiring harness and connectors.
- Check for vehicle modifications.
- Verify 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.
- Record all DTCs.
- Service all non-transaxle codes.