Odometer Symptom Chart

System Block Diagram, PSOM.:

Block Wiring Diagram, Programmable Speedometer/Odometer Module.:

Possible malfunctions of the PSOM are:
a. Inoperative speedometer or odometer. Refer to Pinpoint Test A.
b. Improper operation such as an erratic, jumpy or hesitating speedometer or scrambled digits on the odometer. Refer to Pinpoint Test B.
c. 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 C.
d. Loss of speed output signal to Engine Control computer, Transmission, or Speed Control. Refer to Pinpoint Test D.