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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This step determines if the engine control module (ECM) has set any DTCs related to the HVAC system.
Step | Action | Yes | No | ||||||||
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1 | Did you review the HVAC Preliminary Checks in Heating, Ventilation, and Air Conditioning? | Go to Step 2 | Go to HVAC Preliminary Checks in Heating, Ventilation and Air Conditioning | ||||||||
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 ECM? | Go to Step 4 | Go to Scan Tool Does Not Communicate with Component in Data Link Communications | |||||||||
Select the display DTCs function on the scan tool for the ECM. Does the scan tool display DTC P0532, P0533, or P0645? | Go to Step 5 | ||||||||||
5 | Does the scan tool display any other DTCs? |
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