Schematic Reference: Instrument Cluster Schematics

1

Did you perform the Instrument Cluster Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Instrument Cluster

1. Install a scan tool.
2. Raise the vehicle drive wheels. Refer to Lifting and Jacking the Vehicle in General Information.
3. Start the engine.
4. Place the transmission into drive.
5. With a scan tool, observe the Vehicle Speed Sensor parameter in the PCM Engine Data 1 list.

Does the Vehicle Speed Sensor parameter match the speedometer display?

Go to Step 3

Go to Step 4

Does the odometer work properly?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 9

1. Turn the ignition OFF.
2. Disconnect the PCM connector C1.
3. Turn the ignition ON, with the engine OFF.
4. Measure the voltage from the vehicle speed signal circuit to a good ground.

Does the voltage measure greater than 9.0 volts?

Go to Step  6

Go to Step  5

Test the vehicle speed signal circuit for an open, for a short to ground, or for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step  12

Go to Step  7

Test the vehicle speed signal circuit for a short to battery. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step  12

Go to Step  8

Test the ignition 1 voltage circuit of the instrument cluster for an open or for a short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step  12

Go to Step  9

Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step  12

Go to Step 11

Inspect for poor connections at the harness connector of the IPC. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step  12

Go to Step 10

Replace the instrument panel cluster. Refer to Instrument Cluster Replacement .

Did you complete the replacement?

Go to Step  12

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Important: Program the replacement PCM.

Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls- 4.0L.

Did you complete the replacement?

Go to Step  12

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Operate the system in order to verify the repair.

Use the scan tool in order to clear the DTC's that may have set in other modules during diagnosis.

Did you correct the condition?

System OK

Go to Step 2