1. Disconnect the instrument cluster.
2. Disconnect either the vehicle speed sensor (VSS) calibrator for diesel engine vehicles or the vehicle control module (VCM) for gasoline engine vehicles.
3. Use a J 39200 DMM to measure the resistance from the instrument cluster connector,cavity 14 and the VSS calibrator connector, cavity 15, or the VCM connector C 4, cavity 4.

Refer to Using Connector Test Adapters in Wiring Systems.

Is the resistance greater than the specified value?

1.0 ohms

Go to Step 2

Go to Step 3

Repair the open in CKT 389 (DK GRN) between the instrument cluster connector and the VSS calibrator connector, or the VCM connector C 4.

Is the repair complete?

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System OK

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Use a J 39200 DMM to measure the resistance between the instrument cluster connector, cavity 14, and ground.

Does the resistance measure less than the specified value?

1 M ohms

Go to Step 4

Go to Step 5

Repair the short to ground in CKT 389 (DK GRN) between the instrument cluster connector and the VSS calibrator connector, or the VCM connector C 4.

Is the repair complete?

--

System OK

--

Use a J 39200 DMM to measure the voltage between the instrument cluster connector, cavity 14, and ground.

Is the voltage greater than the specified value?

1.0 V

Go to Step 6

Go to Step 7

Repair the short to voltage in CKT 389 (DK GRN) between the instrument cluster connector and the VSS calibrator connector, or the VCM connector C 4.

Is the repair complete?

--

System OK

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Refer to DTC P0500 Vehicle Speed Sensor (VSS) Circuit for the 4.3 L , Refer to DTC P0500 Vehicle Speed Sensor (VSS) Circuit for the 5.7 L , Refer to DTC P0500 Vehicle Speed Sensor (VSS) Circuit for the 7.4 L , Refer to DTC P0501 Vehicle Speed Sensor (VSS) Performance for the 6.5 L (L65), Refer to DTC P0501 Vehicle Speed Sensor (VSS) Performance for the 6.5 L (L57) in Engine Controls to diagnose the speedometer signal.

Is the repair complete?

--

System OK

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