Intermittent Problem Diagnosis

Use this procedure to locate intermittent driveability problems that do not occur when the vehicle is being tested. These problems may cause a noticeable driveability problem or cause the "malfunction" warning light to illuminate on some vehicles. Before attempting to diagnose an intermittent fault, ensure steps in BASIC TESTING and G - TESTS W/ CODES (if applicable) have been performed. Intermittent fault testing requires you to duplicate a circuit or component failure, in order to identify the fault. These procedures may lead to the computer recording a fault code (on some systems) which may help in diagnosis.

If problem vehicle does not produce fault codes, it will be necessary to monitor voltage or resistance values using a DVOM while attempting to produce conditions which will create an intermittent fault. A change in status on the DVOM will indicate a fault has been located.