Preliminary Testing And Diagnosis

WARNING: This page is about a different car, the 2002 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.

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.

Verify customer's concern:
- Upshift
- Downshift
- Coasting
- Engagement
- Noise/Vibration
1. If noise/vibration, check for dependencies:
  - Engine Speed Dependent
  - Vehicle Speed Dependent
  - Shift Dependent
  - Gear Dependent
  - Range Dependent
  - Temperature Dependent
Vehicle at normal operating temperature.
Inspect fluid level and condition.
Visually inspect the vehicle for the following items:
- Vehicle Modifications
- Electronic Add-On Items
- Leaks
- Proper Linkage Adjustments
Inspect Service Bulletins and on-line repair information.
Perform vehicle on-board diagnosis test. See DIAGNOSTIC TESTS .