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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 P0608: Vehicle Speed Output Circuit >> Conditions for Clearing the MIL/DTC

Conditions for Clearing the MIL/DTC

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DTC P0608 Diagnostic Table

Step Action Value(s) 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 either drive for an automatic transmission, or third gear for a manual transmission.
  5. With the scan tool, observe the Vehicle Speed Sensor parameter in the PCM Engine Data 3 data list.
Does the Vehicle Speed Sensor 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. Turn the ignition ON, with the engine OFF.
  4. Measure the voltage from the vehicle speed signal circuit of the PCM to a good ground.
Does the voltage measure greater than the specified value?		 9.5 V Go to Step 4  Go to Step 5 
4 Test the vehicle speed signal circuit for a short to battery voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 6 
5 Test the vehicle speed signal circuit for an open, for a short to voltage, or for a short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 7 
6 Inspect for poor connections at harness connector of the PCM. 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 10  Go to Step 8 
7 Inspect for poor connections at the harness connector of the IPC. 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 10  Go to Step 9 
8
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 10  -
9
IMPORTANT: Perform the set up procedure for the replacement instrument panel cluster (IPC).
Replace the IPC. Refer to Instrument Panel Cluster (IPC) Replacement .Did you complete the replacement?		 - Go to Step 10  -
10
  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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