W/Harness Inspection

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.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
YES
- Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Go to " CAN communication circuit inspection" procedure.

CAN communication circuit inspection (AFLS ECU ↔ ECM)
1. Ignition "OFF"
2. Disconnect ECM connector and AFLS ECU connector.
3. Measure the resistance between CAN-HIGH terminal of ECM harness connector and CAN-HIGH terminal of AFLS ECU harness connector.
4. Measure the resistance between CAN-LOW terminal of ECM harness connector and CAN-LOW terminal of AFLS ECU harness connector.
  Specification: below 1Ω
  
  Fig 1: Measuring Resistance Between CAN-HIGH/LOW Terminal Of ECM And AFLS ECU
  Courtesy of HYUNDAI MOTOR AMERICA
5. Is the measured resistance within specification?
  YES
  - Substitute with a known - good ECU (AFLS ECU or ECM) and check for proper operation. If the problem is corrected, replace ECU and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Check for open/short in harness.
  - Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.