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Re: 96 jimmy 4.3 trouble codes
Unplug the module connector and check resistance on the black wire in the harness connector to a good, clean chassis ground. Must be less than 5 ohms. If you have battery voltage for "pump prime" at the harness connector grey wire for 2 seconds, and ground resistance checks good, the pump is the problem.
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You have to know how it works,
to figure out why it doesn't.
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