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Test Description

WARNING: This page is about a different car, the 2002 GMC Yukon. However, it is still accessible from the selected car via links, so may be relevant.

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

  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. 3. Check for the presence of DTCs
  3. 4. 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.
  4. 5. Check for the presence of DTCs.
Fig 1: Diagnostic System Check - Real Time Damping (1 Of 2)
G01662886Courtesy of GENERAL MOTORS CORP.
Fig 2: Diagnostic System Check - Real Time Damping (2 Of 2)
G01662887Courtesy of GENERAL MOTORS CORP.
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