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Pinpoint Test

  1. CHECK THE ENGINE COOLING FAN (FAN_DSD) PCM PID OPERATION
    1. Ignition ON.
    2. Using a scan tool, view PCM PIDs  .
    3. Monitor the PCM PID FAN_DSD.
    4. Command the to drive the cooling fan from 0 to 100% of performance and confirm the fan increases speed as the percentage of performance commanded is increased.

    Does the fan speed increase as the commanded performance is increased? 

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