Diagnostic Aids

Some scan tools require an external power feed. Ensure correct power feed is being used. Try scan tool on another vehicle to ensure scan tool and/or communication cables are not at fault. Ensure correct vehicle, model year and VIN code is selected on scan tool.

An intermittent malfunction may be caused by a poor connection, rubbed-through wire insulation, or a wire broken inside insulation. Inspect harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, or poor terminal-to-wire connections before component replacement.