A Important Preliminary Checks

Before using this, you should have performed the Diagnostic System Check-Computers and Controls Systems and determined that:
1. The control module and the malfunction indicator lamp (MIL) are operating correctly.
2. There are no diagnostic trouble codes (DTCs) stored, or a DTC exists but without a MIL.

Several of the following symptom procedures call for a careful visual and physical check. The visual and physical checks are very important. The checks can lead to correcting a problem without further checks which may save valuable time.