CAN communication circuit inspection (MCU ↔ A.A.F)

Ignition "OFF".
Disconnect A.A.F connector and MCU connector.
Measure the resistance between CAN-HIGH terminal of A.A.F harness connector and CAN-HIGH terminal of MCU harness connector.
Measure the resistance between CAN-LOW terminal of A.A.F harness connector and CAN-LOW terminal of MCU harness connector.
Specification : below 1Ω
Is the measured resistance within specification?
YES
- Check MCU, A.A.F 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 for open/short in harness.
- Substitute with a known-good MCU and check for proper operation. If the problem is corrected, replace MCU and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
- Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.