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Test Description

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 3:  Further circuit diagnosis may require IPC removal. Test the circuit from the PCM to the tachometer for being open, shorted to ground or, voltage. If you can not find any trouble, follow the appropriate IPC diagnostic procedure.
DTC P0654

Step Action Values Yes No
Schematic Reference:  Instrument Cluster Schematics  
1 Did you perform the IPC Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - Instrument Cluster 
2 With the engine running, does the vehicles tachometer indicate engine RPM? - Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3 
  1. Turn the ignition OFF.
  2. Disconnect the PCM connector located on the same side as the manufacturer's logo. Refer to Powertrain Control Module (PCM) Replacement in Engine Controls.
  3. Install the Signal Generator Tester between the engine speed signal circuit and a good ground.
  4. Turn the ignition ON.
  5. Set the Signal Generator Tester to generate a tachometer signal.
Does the tachometer indicate a RPM?		 - Go to Step 5  Go to Step 4 
4 Test the engine speed signal circuit for an open, high resistance, or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 9  Go to Step 7 
5 Inspect for poor connections at the PCM connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 9  Go to Step 6 
6 Inspect for poor connections at the harness connector of the IPC. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 9  Go to Step 8 
7
IMPORTANT: Program the replacement PCM.
Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement in Engine Controls.Did you complete the replacement?		 - Go to Step 9  -
8 Replace the IPC. Refer to Instrument Panel Cluster (IPC) Replacement .
Did you complete the replacement?		 - Go to Step 9  -
9
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the conditions for running the DTC.
Does the DTC reset?		 - Go to Step 2  System OK
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