W/Harness Inspection

Engine

Engine Control - P0480 Fan 1 Control Circuit - W/Harness Inspection

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?






Power Supply Circuit Inspection

1. IG "OFF" and disconnect Cooling fan module connector.
2. IG "ON" & ENG "OFF"
3. Measure voltage between terminal 1 of Cooling fan module harness connector and chassis ground.

Specification : Approx. B+




4. Is the measured voltage within specification






Control Circuit Inspection

1. IG "OFF"
2. Disconnect Cooling fan module connector.
3. IG "ON" & ENG "OFF"
4. Measure signal waveform at terminal 2 of cooling fan module.

Reference signal waveform :




5. Is the measured signal waveform normal?






NOTE:
There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by PCM. After testing PCM on the vehicle, use this function to reuse the PCM on the others