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Home >> GMC >> 2002 >> Yukon Denali >> Repair and Diagnosis >> External Pages >> Different car >> Section 343 (ENGINE CONTROLS - SELF-DIAGNOSTICS - 4.8L, 5.3L & 6.0L - Flex Fuel & Gasoline) >> Self-Diagnostic System >> Diagnostic System Check - Engine Cooling >> Test Description

Test Description

WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 2003 Hummer H2, 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 GMC Sierra, and 2003 GMC Cab & Chassis Sierra. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 3

    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

    Determine if the Instrument Panel Cluster (IPC) or Powertrain Control Modules (PCM) have DTCs set which may affect engine cooling operation.

  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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