CAN Communication Line Check

■ CAN Communication Circuit Inspection (ESC↔ 4WD ECU) 

1. Ignition "OFF"
2. Disconnect 4WD ECU connector and ESC connector.
3. Measure the resistance between CAN-HIGH terminal of 4WD ECU harness connector and CAN-HIGH terminal of ESC harness connector.
4. Measure the resistance between CAN-LOW terminal of 4WD ECU harness connector and CAN-LOW terminal of ESC harness connector.

   Specification:  below 1Ω

5. Is the measured resistance within specification?

   YES 

   • Check 4WD ECU connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

   NO 

   • If the measured value is ∞ Ω, repair or replace the open in CAN High/CAN Low circuit. And then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.

■ Check Short to Ground in CAN Communication Line 

1. IG Key "OFF".
2. Measure resistance between CAN high terminal (# 3) of diagnostic connector and chassis ground.
3. Measure resistance between CAN low terminal (# 11) of diagnostic connector and chassis ground.

   Specification:  ∞ Ω

4. Is the measured value within specification?

   YES 

   • Check PCM, 4WD ECU, TCM and ESC PCM connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

   NO 

   • Check short to battery in communication line. And then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
   • Check short to ground in communication line. And then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.