Problem Diagnosis

CAUTION: Electronic modules are sensitive to static electrical charges. Proper grounding of technician and workplace is essential to prevent damage.

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 Diagnostic Trouble Code (DTC) which may help diagnosis.

If system does not set a DTC, use scan tool or Digital Volt-Ohmmeter (DVOM) to monitor voltage or resistance values while attempting to reproduce conditions which will create an intermittent problem. See INTERMITTENT SIMULATION under TEST PROCEDURES.

When monitoring voltage, ensure specified test conditions are met. 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.