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C code chassis High severity

C1179 Speed Control Actuator Assembly Cable Slack Failure

The OBD2 code C1179 indicates a malfunction related to the speed control actuator assembly, specifically due to excessive slack in the actuator cable, which can affect the proper functioning of the cruise control system

Definition

The OBD2 code C1179 indicates a malfunction related to the speed control actuator assembly, specifically due to excessive slack in the actuator cable, which can affect the proper functioning of the cruise control system

Common causes

  • Worn or damaged actuator cable
  • Improper cable routing
  • Loose or corroded connections
  • Faulty speed control actuator
  • Misalignment of components
  • Mechanical obstruction in the throttle system
  • Software or calibration issues in the vehicle's control module

Common misdiagnoses

  • Throttle position sensor failure
  • Accelerator pedal position sensor issue
  • Cruise control module malfunction
  • Wiring harness problems
  • Faulty speed control actuator
  • Engine control module (ECM) issues
  • Brake switch malfunction
  • Vacuum leak in the cruise control system

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are multiple issues

  2. 2. Inspect the Cruise Control System

  3. 3. Wiring and Connectors

    Examine the wiring and connectors associated with the speed control actuator. Look for any signs of damage, corrosion, or loose connections

  4. 4. Cable Condition

    Inspect the actuator cable for fraying, kinks, or excessive slack. Ensure that the cable is properly routed and not obstructed

  5. 5. Test the Speed Control Actuator

  6. 6. Functionality

    Manually test the speed control actuator to ensure it operates correctly. You may need to use a multimeter to check for continuity and proper voltage

  7. 7. Actuator Movement

    Check if the actuator moves freely without any binding or obstruction

  8. 8. Check the Throttle Position Sensor (TPS)

    The TPS is crucial for the cruise control system. Ensure that it is functioning correctly and providing accurate readings. If the TPS is faulty, it may affect the actuator's performance

  9. 9. Inspect the Brake Pedal Position Switch

    The brake pedal position switch is a safety feature that disengages cruise control when the brake is pressed. Ensure that this switch is functioning correctly and not causing the system to think the brake is engaged

  10. 10. Check for Vacuum Leaks

    If the cruise control system uses a vacuum actuator, inspect for any vacuum leaks in the hoses or connections that could affect performance

  11. 11. Clear the Codes and Test Drive

    After performing the inspections and repairs, clear the trouble codes using the OBD-II scanner. Take the vehicle for a test drive to see if the code reappears

  12. 12. Consult the Service Manual

    If the issue persists, refer to the vehicle's service manual for specific troubleshooting procedures related to the cruise control system and the C1179 code

  13. 13. Seek Professional Help

    If you are unable to resolve the issue after these steps, it may be best to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these steps, you should be able to diagnose and potentially resolve the C1179 code related to the speed control actuator assembly