Schematic Reference: Instrument Cluster Schematics

Did you perform the Diagnostic System Check - Vehicle?

--

Go to Step 2

Go to Diagnostic System Check - Vehicle

1. Install a scan tool.
2. Start the engine.
3. With the scan tool, observe the Engine Speed parameter in the engine control module (ECM) Engine Data 1 data list.

Does the Engine Speed parameter match the tachometer display?

--

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

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

Does the voltage measure greater than the specified value?

9 V

Go to Step 6

Go to Step 4

Test the engine speed signal circuit for an open or for a high resistance. Refer to Circuit Testing and to Wiring Repairs .

Did you find and correct the condition?

--

Go to Step 9

Go to Step 5

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 9

Go to Step 7

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

Did you find and correct the condition?

--

Go to Step 9

Go to Step 8

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

Did you complete the replacement?

--

Go to Step 9

--

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

Did you complete the replacement?

--

Go to Step 9

--

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2