W/Harness Inspection

Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness and terminal condition. 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. Check voltage
(1) IG "OFF".
(2) Disconnect the Radiator fan relay (Low).
(3) IG "ON" and ENG "OFF"
(4) Measure the voltage between terminal 30, 85 of the Radiator fan relay (Low) 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 Radiator 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 Radiator fan relay (Low)
3. IG "ON" & ENG "OFF"
4. Measure voltage between terminal 86 of the Radiator fan relay (Low) harness connector and chassis ground.
A. Specification : Approx. 2.5V




5. Is the measured voltage within specifications?
YES
1) Replace Radiator fan relay (Low) and check for proper operation.
If the problem is not corrected, 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.
NO
1) Repair open or short in control circuit, and go to "Verification of Vehicle Repair" procedure.

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