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Conditions for Clearing the MIL/DTC

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DTC P0654 Diagnostic Table

Step Action Yes No
Schematic Reference:  Instrument Cluster Schematics  
Connector End View Reference:  Instrument Panel, Gages, and Console Connector End Views  ,  Powertrain Control Module (PCM) Connector End Views  , or  Powertrain Control Module (PCM) Connector End Views 
1 Did you perform the instrument panel cluster (IPC) Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Instrument Cluster 
2
  1. Install a scan tool.
  2. Start the engine.
  3. With the scan tool, observe the Engine Speed parameter in the PCM Engine Data 3 data list.
Does the Engine Speed parameter match the tachometer display?		 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 following powertrain control module (PCM) connector:
    • C1 (LL8)
    • C2 (LM4)
  3. Install one J 33431-C  Signal Generator and Instrument Panel Tester lead to the engine speed signal circuit at the PCM harness connector, and connect the other lead to a good ground. See Special Tools and Equipment .
  4. Turn the ignition ON, with the engine OFF.
  5. Set the J 33431-C  to generate a tachometer signal. See Special Tools and Equipment .
Does the vehicle tachometer indicate an RPM reading?		 Go to Step 5  Go to Step 4 
4 Test the engine speed signal circuit for a short to voltage or for a short to ground. Refer to Circuit Testing and toWiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 9  Go to Step 6 
5 Inspect for poor connections at the PCM connector. 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 9  Go to Step 7 
6 Inspect for a poor connection at the harness connector of the IPC. Refer toTesting for Intermittent Conditions and Poor Connections and to 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 - 4.2L or to Powertrain Control Module (PCM) Replacement in Engine Controls - 4.8L, 5.3L, or 6.0L.
Did you complete the replacement?		 Go to Step 9  -
8
IMPORTANT: Program the replacement IPC.
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 vehicle within the Conditions for Running this DTC.
Does the DTC reset?		 Go to Step 2  System OK
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