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C1112 ABS Power Relay Coil Short Circuit To Ground

The OBD2 code C1112 indicates a short circuit in the ABS power relay coil to ground, which means there is an electrical fault causing the relay to malfunction, potentially affecting the anti-lock braking system's...

Definition

The OBD2 code C1112 indicates a short circuit in the ABS power relay coil to ground, which means there is an electrical fault causing the relay to malfunction, potentially affecting the anti-lock braking system's operation

Common causes

  • Damaged wiring or connectors
  • Shorted relay coil
  • Faulty ABS control module
  • Corroded terminals
  • Grounding issues
  • Water intrusion or moisture damage
  • Improper installation or modifications

Common misdiagnoses

  • Faulty ABS module
  • Damaged wiring or connectors
  • Defective power relay
  • Shorted ABS sensor
  • Malfunctioning brake control system
  • Battery or charging system issues
  • Faulty ground connections
  • Incorrectly installed aftermarket components

Troubleshooting steps

  1. 1. Visual Inspection

    Wiring and Connectors: Check the wiring harness and connectors related to the ABS power relay. Look for signs of damage, fraying, corrosion, or loose connections

  2. 2. Relay Condition

    Inspect the ABS power relay for any physical damage or signs of overheating

  3. 3. Check the Relay

    Test the Relay: If possible, test the ABS power relay using a multimeter. Check for continuity and ensure it operates correctly when energized

  4. 4. Swap the Relay

    If the relay is suspected to be faulty, consider swapping it with a similar relay in the vehicle (if applicable) to see if the issue persists

  5. 5. Inspect Ground Connections

    Ground Points: Check all ground connections related to the ABS system. Ensure they are clean, tight, and free of corrosion

  6. 6. Ground Circuit Testing

    Use a multimeter to test the ground circuit for continuity and resistance. A high resistance or open circuit can cause issues

  7. 7. Check for Short Circuits

    Wiring Inspection: Look for any signs of short circuits in the wiring harness, especially where the wires may rub against metal or other components

  8. 8. Use a Multimeter

    Measure resistance between the relay coil terminals and ground to check for unintended shorts

  9. 9. Scan Tool Diagnosis

    Read Codes: Use an OBD-II scanner to read any additional trouble codes that may be present. This can provide more context for the issue

  10. 10. Live Data

    Check live data from the ABS system to see if there are any abnormal readings that could indicate a problem

  11. 11. Check Power Supply

    Voltage Check: Ensure that the ABS power relay is receiving the correct voltage. Use a multimeter to measure the voltage at the relay terminals

  12. 12. Fuses

    Check the relevant fuses for the ABS system to ensure they are intact and functioning

  13. 13. Inspect ABS Module

    Module Condition: If all other components check out, the ABS control module itself may be faulty. Inspect for any signs of damage or water intrusion

  14. 14. Reprogramming/Resetting

    In some cases, reprogramming or resetting the ABS module may be necessary

  15. 15. Professional Help

    If the issue persists after performing these steps, consider seeking help from a professional mechanic or an automotive technician who specializes in ABS systems. By following these steps, you should be able to identify the cause of the C1112 code and take appropriate action to resolve the issue