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?






Signal Circuit Inspection

Check CAN BUS resistance in Data Link Connector
1. IG "OFF"
2. Measure the resistance between CAN-HIGH and CAN-LOW terminals of data link connector (Measurement "A")
3. Disconnect PCM and ABS/ESC ECU connector.
4. Measure the resistance between CAN-HIGH and CAN-LOW terminals of data link connector (Measurement "B")

Specification : ECM, ABS/ESC ECU connected : 60 ± 3 Ohms (Measurement "A"), PCM disconnected : 120 ± 3 Ohms (Measurement "B")









5. Is the measured resistance within specification?





Check short to ground in CAN BUS
1. IG "OFF" and disconnect ECM and ABS/ESC ECU connector.
2. Check resistance between CAN-HIGH terminal of Data Link Connector and chassis ground. (CAN HIGH line)
3. Check resistance between CAN-LOW terminal of Data Link Connector and chassis ground. (CAN LOW line)

Specification : Infinite





4. Is the measured resistance within specification?





Check short to battery in CAN BUS
1. IG "OFF" and disconnect ECM and ABS/ESC ECU connector.
2. IG "ON"
3. Measure the voltage between CAN-HIGH terminal of Data Link Connector and chassis ground. (CAN HIGH line)
4. Measure the voltage between CAN-LOW terminal of Data Link Connector and chassis ground. (CAN LOW line)

Specification : 0.0V ~ 0.1V





5. Is the measured voltage within specification?





Check open in CAN BUS line
1. IG "OFF" and disconnect ECM and ABS/ESC ECU connector.
2. Check resistance between CAN-HIGH terminal of Data Link Connector and CAN-HIGH terminal of each module. (Measurement "A")
3. Check resistance between CAN-LOW terminal of Data Link Connector and CAN-LOW terminal of each module. (Measurement "B")

Specification : Below 1.0 Ohm









4. Is the measured resistance within specification?