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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1401 (Instrument Panel System Displays, Gauges And Console) >> Diagnostic Information and Procedures >> DTC B0540: Speedometer Circuit >> Conditions for Clearing the DTC

Conditions for Clearing the DTC

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DTC B0540 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 IPC Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Instrument Cluster 
2
  1. Install a scan tool.
  2. Raise the vehicle's drive wheels. Refer to Lifting and Jacking the Vehicle in General Information.
  3. Start the engine.
  4. Place the transmission into drive for an automatic transmission and third gear for a manual transmission.
  5. With the scan tool, observe the Vehicle Speed parameter in the PCM Engine Data 1 data list.
Does the Vehicle Speed parameter match the speedometer 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 PCM connector:
    • C1 (LL8)
    • C2 (LM4)
  3. Install the J 33431-C  Signal Generator and Instrument Panel Tester lead to the vehicle speed signal circuit at the PCM harness connector, and 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 speedometer signal. See Special Tools and Equipment .
Does the vehicle speedometer indicate a reading?		 Go to Step 5  Go to Step 4 
4 Test the vehicle speed signal circuit for an open, short to voltage 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 6 
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 7 
6 Inspect for a poor connection 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 - 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 DTC's.
  2. Operate vehicle within the conditions for running this DTC as specified in the supporting text.
Does the DTC reset?		 Go to Step 2  System OK
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