Intermittent Simulation

Intermittent problem diagnosis requires duplication of circuit or component failure in order to identify problem. These procedures may lead to PCM recording a DTC which may help 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.

To reproduce conditions causing intermittent problem(s) apply light vibration to components, apply small amount of heat to component, wiggle or bend wiring harness and remove/apply vacuum supply source.

Monitor circuit/component voltage or resistance while attempting to simulate intermittent. If vehicle is running, monitor for DTCs. Use test results to identify problem component or circuit.