Test Description
The numbers below refer to the step numbers on the diagnostic table.
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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.
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Determine if the instrument cluster or powertrain control modules (PCMs) have set DTCs which may affect Engine Cooling operation are present.
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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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If DTC P1484 or P0495 is set along with DTC P0113 and the weather conditions are cold, the cooling fan codes may be false.
Step | Action | Yes | No | ||||
|---|---|---|---|---|---|---|---|
1 | Did you review a Diagnostic Starting Point-Engine Cooling? | Go to Step 2 | |||||
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 | ||||
Does the scan tool communicate with the control modules? | Go to Step 4 | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | |||||
Select the powertrain control module display DTCs function on the scan tool. Does the scan tool display any DTCs? | Go to Step 5 | ||||||
Does the scan tool display any DTCs which begin with a "U"? | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | Go to Step 6 | |||||
Does the scan tool display any DTCs that are associated with the Engine Cooling System? | 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 |
