Diagnostic Aids

Check for the following conditions:

• A poor connection or damaged harness - Inspect ECM harness connectors for the following:
  • Backed out terminals
  • Improper mating
  • Broken locks
  • Poor wire to terminal connections
• Intermittent test - Monitor a scan tool or digital voltmeter connected between the related circuits while moving the connectors and harnesses. If the failure is induced, the voltage reading will change. This will help locate a circuit problem. Refer to
• For an intermittent condition, refer to Intermittent Conditions in Engine Controls - 2.0L (L34).