Problem Diagnosis

If system does not set a DTC, use scan tool or DVOM to monitor voltage or resistance values while attempting to reproduce conditions which will create an intermittent problem.

When monitoring voltage, ensure ignition switch is in RUN position or engine is running. When monitoring resistance, ensure ignition switch is in LOCK position or negative battery cable is disconnected. A status change on scan tool or DVOM while performing test procedures indicates area of problem.

Intermittent problem diagnosis requires duplication of circuit or component failure in order to identify problem. See TEST PROCEDURES  . These procedures may lead to Powertrain Control Module (PCM) recording a DTC which may help diagnosis.