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Test Description

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

  1. 1:  Lack of communication may be due to a malfunction of the serial data circuits. The specified procedure will determine the particular condition.
  2. 3:  The presence of DTCs may be related to an engine electrical condition. The specified procedure will compile all the available information before tests are performed.
Diagnostic System Check - Instrument Cluster

Step Action Yes No
1  Install a scan tool.
Does the scan tool power up?		 Go to Step 2  Go to Scan Tool Does Not Power Up in Data Link Communications
2
  1. Turn ON the ignition, with the engine OFF.
  2. Attempt to establish communication with the engine control module (ECM).
Does the scan tool communicate with the ECM?		 Go to Step 3  Go to Scan Tool Does Not Communicate with Component in Data Link Communications
3  Select the Display DTCs function for the ECM.
Does the scan tool display DTC P0461, P0462, P0463 or P0464?		 Go to Diagnostic Trouble Code (DTC) List  Go to Symptoms - Instrument Panel, Gages and Console 
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