Diagnostic Aids
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It may be possible to locate the fault by disconnecting one component at a time from the 5-volt reference circuit while viewing the 5-Volt Reference circuit parameter on the scan tool. The scan tool parameter would change from Fault to OK when the source of the fault is disconnected.
If all 5-volt reference components have been disconnected and a Fault is still indicated, the fault may exist in the wiring harness.