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

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.
A. Specification : Approx. B+




4. Is the measured voltage within specification?
YES
1) Go to "Control Circuit Inspection" procedure.
NO
1) Check if cooling fan fusible link 60A is open or not installed.
2) Check if cooling fan relay is not installed or faulty
3) Check if the line between cooling fan relay and Cooling fan module is open.
4) Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.

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.
A. Reference signal waveform :




5. Is the measured signal waveform normal?
YES
1) If the problem is corrected after substituting with a known - good Cooling Fan module, replace it.
If the problem is pending, check for proper operating after substituting with a known - good PCM.
and then if the problem is corrected, replace PCM and go to "Verification of Vehicle Repair" procedure.
NO
1) Check that harness connected at engine compartment junction block is disconnected or not.
2) Check the line between terminal 2 of Cooling Fan module harness connector and terminal 66 of PCM harness connector for open.
3) Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.

CAUTION:
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.