Intermittent Problem Diagnosis

Intermittent trouble code testing requires duplicating circuit or component failure to identify problem. These procedures may lead to computer setting a trouble code(s) which may help in diagnosis.

If vehicle does not produce a trouble code(s), monitor voltage or resistance values using a DVOM while attempting to reproduce conditions causing intermittent fault. A status change on DVOM indicates a fault has been located.

Use a DVOM to pinpoint faults. When monitoring voltage, ensure ignition switch is in ON position or engine is running. Ensure ignition is in OFF position or negative battery cable is disconnected when monitoring circuit resistance. Status changes on DVOM during test procedures indicate area of fault.