Inspection and Verification

Visually inspect the components. Check for damaged components, blown fuses, loose or corroded connections. Check the wiring harness for obvious signs of shorts, opens, bad connections or damage.

Verify circuit operation. Verify speedometer and odometer operation by road testing the vehicle.

Possible malfunctions of the PSOM are:

• Inoperative speedometer or odometer. Refer to Pinpoint Test G.
• Improper operation such as an erratic, jumpy or hesitating speedometer or scrambled digits on the odometer. Refer to Pinpoint Test H.
• Inaccuracy concerns such as the odometer not indicating the proper mileage after traveling a known distance or the speedometer higher or lower than expected to travel a known distance in the proper amount of time. Refer to Pinpoint Test F.
• Loss of speed output signal to engine control computer, transmission or speed control. Refer to Pinpoint Test J.