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Home >> Pontiac >> 2004 >> Aztek Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 155 (Engine Cooling System) >> Diagnostic Information and Procedures >> Diagnostic System Check - Engine Cooling >> Test Description

Test Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. 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. 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 cluster or powertrain control modules (PCMs) have set DTCs which may affect Engine Cooling operation are present.
  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.
  4. 6:  If DTC P1484 or P0495 is set along with DTC P0113 and the weather conditions are cold, the cooling fan codes may be false.
Diagnostic System Check - Engine Cooling

Step Action Yes No
1 Did you review a Diagnostic Starting Point-Engine Cooling? Go to Step 2  Go to Diagnostic Starting Point - Engine Cooling 
2 Install a scan tool.
Does the scan tool power up?		 Go to Step 3  Go to Scan Tool Does Not Power Up in Data Link Communications
3 
  1. Turn ON the ignition, with the engine OFF.
  2. Attempt to establish communication with the following control modules:
    • The instrument cluster
    • The powertrain control module
Does the scan tool communicate with the control modules?		 Go to Step 4  Go to Scan Tool Does Not Communicate with Class 2 Device (W/O Immobilizer) or Scan Tool Does Not Communicate with Class 2 Device (W/ Immobilizer) in Data Link Communications
4  Select the powertrain control module display DTCs function on the scan tool.
Does the scan tool display any DTCs?		 Go to Step 5  Go to Symptoms - Engine Cooling 
5  Does the scan tool display any DTCs which begin with a "U"? Go to Scan Tool Does Not Communicate with Class 2 Device (W/O Immobilizer) or Scan Tool Does Not Communicate with Class 2 Device (W/ Immobilizer) in Data Link Communications Go to Step 6 
6  Does the scan tool display any DTCs that are associated with the Engine Cooling System? Go to Diagnostic Trouble Code (DTC) List  Go to Diagnostic Trouble Code (DTC) List in Engine Controls - 4.2L or Diagnostic Trouble Code (DTC) List in Engine Controls - 4.8L, 5.3L, and 6.0L
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