Schematic Reference: Instrument Cluster Schematics

Connector End View Reference: Master Electrical Component List

1

Did you perform the Diagnostic System Check - Vehicle?

--

Go to Step 2

Go to Diagnostic System Check - Vehicle

1. Turn the ignition OFF.
2. Disconnect the powertrain control module (PCM) connector C2 (LBZ, LLY, LMM, LF8, and L18) or C3 (LG4).
3. Install one lead of the J 33431-C to the vehicle speed signal circuit at the PCM harness connector and the other lead to a good ground.
4. Turn the ignition ON, with the engine OFF.
5. Set the J 33431-C to generate a speedometer signal.

Does the vehicle speedometer indicate approximately 88.5 km/h (55 mph)?

--

Go to Step 3

Go to Step 4

Does the odometer operate correctly?

--

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 9

4

1. Turn the ignition OFF.
2. Disconnect the PCM connector C2 (LBZ, LLY, LMM, LF8, and L18) or C3 (LG4).
3. Turn the ignition ON.
4. Measure the voltage from the vehicle speed signal circuit to a good ground.

Does the voltage measure greater than the specified value?

9.0 V

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 .

Did you find and correct the condition?

--

Go to Step 11

Go to Step 7

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

Did you find and correct the condition?

--

Go to Step 11

Go to Step 8

Inspect for poor connections at the harness connector of the instrument panel cluster (IPC). Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .

Did you find and correct the condition?

--

Go to Step 11

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 .

Did you find and correct the condition?

--

Go to Step 11

Go to Step 10

Replace the IPC. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

--

Go to Step 11

--

Replace the PCM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

--

Go to Step 11

--

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2