Odometer Circuit Fault

Odometer Circuit Fault:

Odometer Dark Or Displaying Incorrectly:

The speedometer/odometer is controlled by electronics within the instrument panel cluster and by the vehicle speed signal (5000 pulses per mile) provided by the PCM. This signal is based on the raw vehicle speed signal that the PCM receives from the Vehicle Speed Sensor (VSS), and the tire size information programmed into the PCM.

IMPORTANT: Do not leave the speedometer test running for an extended period of time. The odometer will accumulate mileage while this test is running.

Diagnostic Aids
Speedometer test points can be accessed on the Scan tool.

SPEEDO FEEDBACK can be accessed on the Scan tool data lists.
^ Using the Scan tool, monitor the VSS input and verify that the signal is steady.
^ If numbers can be seen on the odometer but the odometer is not illuminated, check the odometer bulb.