Signal Circuit Inspection

[With ABS]

Check for open in circuit
1. Ignition "OFF".
2. Disconnect ECM and ABS or ESP Control Module connectors.
3. Measure resistance between terminals 22 of the ECM harness connector and 3 of the ABS Control Module harness connector (W/ABS)
  Specification: Approx. 0Ω
  
  Fig 1: Measuring Resistance Between Terminals Of ECM Harness Connector And ABS Control Module Harness Connector
  Courtesy of HYUNDAI MOTOR CO.
4. Is resistance within the specification?
  YES:
  - Go to next step below.
  NO:
  - Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check for short to ground in circuit.
1. Measure resistance between terminal 22 of the ECM harness connector and chassis ground.
  Specification: Infinite
  
  Fig 2: Measuring Resistance Between Terminal 22 Of ECM Harness Connector And Chassis Ground
  Courtesy of HYUNDAI MOTOR CO.
2. Is resistance within the specification?
  YES:
  - Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO:
  - Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

[Without ABS system]

Check for open in circuit.
1. Ignition "OFF".
2. Disconnect ECM and wheel speed sensor (front right) harness connector.
3. Measure resistance between wheel speed sensor harness connector and ECM harness connector.
  Specification: Approx. 0Ω
  - Terminal 1 (sensor) & Terminal 38(ECM)
  - Terminal 2(sensor) & Terminal 39(ECM)
  Fig 3: Measuring Resistance Between Wheel Speed Sensor Harness Connector And ECM Harness Connector
  Courtesy of HYUNDAI MOTOR CO.
4. Is resistance within the specification?
  YES:
  - Go to next step below.
  NO:
  - Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Check for short to ground in circuit.
1. Measure resistance between terminal 38 of the ECM harness connector and chassis ground.
2. Measure resistance between terminal 39 of the ECM harness connector and chassis ground.
  Specification: Infinite
  
  Fig 4: Measuring Resistance Between Terminal Of ECM Harness Connector And Chassis Ground
  Courtesy of HYUNDAI MOTOR CO.
3. Is resistance within the specification?
  YES:
  - Check wheel speed sensor (FR) as follow:
    - Gap between ABS sensor and trigger wheel (Air gap: 0.3~0.9 mm(0.011 ~ 0.035 in))
    - Trigger wheel condition.
    - Sensor resistance: Approx. 1,275~1,495 Ω at 20°C (68°F)
  - Replace wheel speed sensor as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO:
  - Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.