W/Harness Inspection

4WD Control
U0001 CAN Communication Malfunction - Inspection/Repair:_: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?






CAN register and communication line inspection

CAN register and communication line inspection 1
1. IG KEY OFF.
2. Connect PCM, 4WD ECM, TCM, ABS connector.
3. Measure registance between terminal 3 and 11 of diagnostic connector.

Specification :About 60 Ohms








4. Is the measured resistance within specification ?





CAN register and communication line inspection 2
1. .IG KEY OFF
2. Disconnect PCM, IPM connector.
3. Measure resistance between terminal CAN Low and CAN High of ECM.

Specification :About 120 Ohms








4. Is the measured resistance within specification ?






CAN communcation line inspection

Check short to battery in CAN communication line.
1. IG KEY OFF
2. Disconnect PCM, 4WD ECM, TCM and ABS connector.
3. IG KEY OFF
4. Measure voltage between CAN high terminal(# 3) of diagnostic connector and chassis ground.
5. Measure voltage between CAN low terminal(#11) of diagnostic connector and chassis ground.

Specification :About 0V

Check short to ground in CAN communication line
1. IG KEY OFF.
2. Disconnect PCM, 4WD ECM, TCM and ABS connector.
3. Measure resistnace between CAN high terminal (# 3) of diagnostic connector and chassis ground.
4. Measure resistance between CAN low terminal (# 11) of diagnostic connector and chassis ground.

Specification :Infinity Ohms








5. Is the measured value within specification ?