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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1570 (Instrument Panel, Gauges & Console) >> Diagnostic Information and Procedures >> Speedometer and/or Odometer Inaccurate or Inoperative

Speedometer and/or Odometer Inaccurate or Inoperative

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Speedometer and/or Odometer Inaccurate or Inoperative

Step Action Yes No
Schematic Reference: Instrument Cluster Schematics 
Connector End View Reference: Instrument Panel, Gages, and Console Connector End Views 
1 Did you perform the Instrument Cluster Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Instrument Cluster 
2
  1. Turn ON the ignition, with the engine OFF.
  2. Install a scan tool.
  3. With the scan tool, perform the segments test in the instrument panel cluster (IPC) scan tool output controls.
Do all of the segments of the driver information center (DIC) illuminate?		 Go to Step 3  Go to Step 6 
3
  1. Install a scan tool.
  2. Raise the vehicles drive wheels. Refer to LIFTING AND JACKING THE VEHICLE .
  3. Start the engine.
  4. Place the transmission into drive for automatic transmission or third gear for manual transmission.
  5. With the scan tool, observe the Vehicle Speed Sensor (VSS) parameter in the IPC Data 1 data list.
Does the VSS parameter match the speedometer display?		 Go to TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS in Wiring Systems Go to Step 4 
4 Test the vehicle speed signal circuit for a high resistance between the IPC and the powertrain control module (PCM). Refer to CIRCUIT TESTING and WIRING REPAIRS in Wiring Systems.
Did you find and correct the condition?		 Go to Step 7  Go to Step 5 
5 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 7  Go to Step 6 
6
IMPORTANT: Program the replacement IPC.
Replace the IPC. Refer to Instrument Panel Cluster (IPC) Replacement .Did you complete the replacement?		 Go to Step 7  -
7 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 3 
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