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?
YES
> Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO
> Go to " Power Circuit Inspection " procedure

Power Supply Circuit Inspection

Check voltage
1. IG "OFF".
2. Disconnect Cooling fan relay (low) (Radiator fan relay).
3. IG "ON" and ENG "OFF"
4. Measure voltage between battery power supply terminals of Cooling fan relay (low) (Radiator fan relay) harness connector and chassis ground.
A. Specification : B+








5. Is the measured voltage within specification?
YES
1) Go to "Control Circuit Inspection" procedure.
NO
1) Check if cooling fan fuse is open or not installed.
2) Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.

Control Circuit Inspection

1. IG "OFF"
2. Disconnect the Cooling fan relay (low) (Radiator fan relay)
3. IG "ON" & ENG "OFF"
4. Measure voltage between Fan Relay Control (Low) terminal of Cooling fan relay (low) (Radiator fan relay) harness connector and chassis ground.
A. Specification : Approx. 2.5 V








5. Is the measured voltage within specifications?
YES
1) Substitute with a known - good PCM and check for proper operation.
If the problem is corrected, replace PCM and go to "Verification of Vehicle Repair" procedure.

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

NO
1) Repair open or short in control circuit, and go to "Verification of Vehicle Repair" procedure.