Diagnostic Aids
An intermittent may be caused by a poor connection, rubbed through wire insulation or a wire broken inside insulation. Check for:
- Poor Connection Or Damaged Harness: Inspect PCM harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection and damaged harness.
- Intermittent Test: If connections and harness are okay, monitor a DVOM connected between affected terminal and ground while moving related connectors and wiring harness. If failure is induced, voltage reading will change.
- Checks will diagnose an incorrect EGR pintle position sensor input signal. This test verifies a 5 volts reference at EGR valve.
- Ensures position signal circuit is not shorted to ground.
- Checks position signal circuit for an open.