Symptom Diagnosis
When a diagnostic code cannot be confirmed or problem cannot be confirmed in BASIC TESTING , find basic symptom. For example, vehicle engine will not start. Appropriate heading matching vehicle symptom is DOES NOT START. Listed under DOES NOT START are more specific conditions. Find specific condition which best describes vehicle malfunction. Perform checks in order given. DO NOT skip steps.
NOTE:
Even if a diagnostic code is not set, this article may refer you to a test procedure for a specific diagnostic code in TESTS W/CODES - EXCEPT OBD-II
article in the ENGINE PERFORMANCE section.
This article includes trouble shooting for the following symptoms:
- Does Not Start
- Difficult To Start
- Poor Idling
- Poor Driveability
- Engine Stall