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Diagnostic Aids

WARNING: This page is about a different car, the 2002 Isuzu Trooper. However, it is still accessible from the selected car via links, so may be relevant.

An intermittent may be caused by a poor connection, rubbed-through wire insulation or a broken wire inside insulation. Inspect harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal-to-wire connection, and damaged harness. If wiring harness appears okay. Disconnect PCM Blue 80-pin harness connector E-21. PCM is located at right rear of engine compartment. Connect DVOM to ground and PCM harness connector E-21 terminal No. 73 (CKP input) and wiggle harness and connectors. See WIRING DIAGRAMS article. A change in voltage will indicate area of problem. If DTC cannot be duplicated, check scan tool FAILURE RECORDS to determine mileage since last DTC was set.

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