Diagnostic Aids
An intermittent may be caused by a poor connection, rubbed through wire insulation, or a wire broken inside the insulation. Check for the following conditions:
- Poor Connection or Damaged Harness. Inspect ECM harness connectors for backed out terminal BD4, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection and damaged harness.
- Intermittent Test. If connections and harness check okay, monitor EI78 display, while moving related connectors and wiring harness. If failure is induced, reading will change. This will help to isolate location of the malfunction.