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Test Description

The numbers below refer to the step numbers in the diagnostic procedure.

  1. 2

    Lack of communication may be due to 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. 4

    Checks for DTCs in the BCM and the PCM.

  3. 5

    The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.
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