Diagnostic Aids
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Always use Connector Test Adapter Kit (J 35616-A) or Flat Wire Probe Adapter Kit (J 42675) to front probe terminals. Do not use paper clips or other substitutes as they can damage terminals and cause incorrect measurements.
Do not operate AIR pump for more than 60 seconds. Continuous operation of AIR pump in excess of 60 seconds will damage AIR pump.
If the problem is intermittent, See INTERMITTENT CONDITIONS under SELF-DIAGNOSTIC SYSTEM.
An AIR pump that had become inoperative and had shown indications of having exhaust gases in the outlet port would indicate check valve failure.