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Test Description

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

  1. 4. Lack of communication may be because of a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
  2. 5. The symptom list in Symptoms will determine the correct diagnostic procedure to use.
  3. 6. The presence of DTCs which begin with a "U" indicate some other module is not communicating.

    The specified procedure will collect all the available information before you perform tests.

    Fig 1: Diagnostic System Check - Engine Electrical
    G01969689Courtesy of GENERAL MOTORS CORP.
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