Diagnostic Strategies

DIAGNOSIS OF FAULTS IS DONE IN THREE BASIC STEPS:
1. Visual inspection
- A careful and thorough visual inspection may quickly identify the cause of a malfunction and eliminate the need for additional diagnostic procedures.

- Diagnosis of vehicle faults always starts with the visual inspection. If the fault is not resolved by the visual inspection, perform the Diagnostic Tests found in Diagnostic Charts.


2. Diagnostic tests
- Each specific fault is diagnosed by following a specific testing sequence. It is not necessary to perform all of the tests to diagnose an individual fault.

- Always begin diagnostic testing with Test IA. This will direct you to the specific test(s) that must be performed in response to the specific vehicle fault.


3. Verification test
- A verification of system operation must always be performed to ensure that the system is operating normally after the cause of a fault has been found and repaired.