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Home >> Ford >> 2012 >> Mustang Base, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 153 (Anti-Lock Brake System And Stability Control - F-150) >> Diagnosis And Testing >> Anti-Lock Control >> Pinpoint Tests >> Pinpoint Test I: DTCs C109D, C109E and C109F >> PINPOINT TEST I: DTCs C109D, C109E AND C109F

PINPOINT TEST I: DTCs C109D, C109E AND C109F

WARNING: This page is about a different car, the 2012 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. I1 CHECK THE ABS MODULE DTCs 
    • Review the DTCs recorded during Inspection and Verification.
    • Was DTC C109D the only recorded DTC? 
      • Yes  : GO to I2.
      • No  : If DTC C109E and/or C109F was retrieved, GO to  I6. For all other DTCs, REFER to the ABS Module DTC Chart  .
  2. I2 CHECK DTC RETURNABILITY 
    • Using the scan tool, clear the ABS module DTCs.
    • Ignition OFF.
    • Disconnect the scan tool.
    • Start the engine.
      • NOTE: It may take up to 3 minutes for DTC C109D to set.
    • Allow the vehicle to idle for a minimum of 4 minutes. Apply and release the brake pedal for a minimum of 3 times per minute with normal pedal force for up to 3 minutes
    • Ignition OFF.
    • Connect the scan tool.
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: Self Test - ABS Module.
    • Is DTC C109D the only vacuum sensor DTC present? 
      • Yes  : GO to I3.
      • No  : If DTC C109E and/or C109F was retrieved, GO to  I6. For all other DTCs, REFER to the ABS Module DTC Chart  .

        If no DTC is set, the system is operating correctly as this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTC. REPEAT the self-test.

  3. I3 CHECK THE ENGINE VACUUM 
  4. I4 CHECK THE BRAKE BOOSTER 
    • Carry out the Brake Booster Component Test. REFER to BRAKE SYSTEM - GENERAL INFORMATION .
    • Do the brake booster and check valve pass the component test? 
      • Yes  : GO to I5.
      • No  : REPAIR or INSTALL new as necessary. CLEAR the DTC. REPEAT the self-test.
  5. I5 CHECK THE BRAKE BOOSTER VACUUM LEVEL (BBVACLVL) PID 
    • Connect the scan tool.
    • Start the engine.
    • Enter the following diagnostic mode on the scan tool: DataLogger - ABS Module.
    • Compare the recorded vacuum reading the brake booster vacuum level PID.
    • Does the PID match the recorded vacuum reading of ±3.386 kPa (1 in-Hg)? 
      • Yes  : REPAIR any vacuum leaks at the vacuum system. For 4x4 vehicles, REPAIR any vacuum leaks from the vacuum hub lock system. REPEAT the ABS module self-test.
      • No  : INSTALL a new brake booster vacuum sensor. REFER to POWER BRAKE ACTUATION . CLEAR the DTCs. TEST the system for normal operation.
  6. I6 CHECK THE BRAKE BOOSTER VACUUM SENSOR 
    • Inspect the vacuum sensor ambient air pressure inlet ports.
    • Are both ports free of contamination, debris and/or foreign material? 
      • Yes  : GO to I7.
      • No  : REPAIR or INSTALL a new vacuum sensor as necessary. REFER to POWER BRAKE ACTUATION . CLEAR the DTCs. REPEAT the self-test.
  7. I7 CHECK THE BRAKE BOOSTER VACUUM SENSOR CIRCUITS FOR A SHORT TO GROUND 
    • Disconnect: ABS Module C135.
    • Disconnect: Brake Booster Vacuum Sensor C149.
    • Measure the resistance between ground and:
      • brake booster vacuum sensor C149-1, circuit VCA22 (GN/BN), harness side.
      • brake booster vacuum sensor C149-2, circuit GD120 (BK/GN), harness side.
      • brake booster vacuum sensor C149-3, circuit CCA22 (GY/YE), harness side.
      Fig 1: Measuring Resistance Between Ground And Brake Booster Vacuum Sensor C149-1, Circuit VCA22 (GN/BN), Harness Side
      G06453252Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10, 000 ohms? 
      • Yes  : GO to I8.
      • No  : REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.
  8. I8 CHECK THE BRAKE BOOSTER VACUUM SENSOR CIRCUITS FOR AN OPEN 
    • Measure the resistance between the ABS module C135, harness side and the brake booster vacuum sensor C149, harness side as follows:
      ABS Module Circuit Vacuum Sensor
      C135-10 VCA22 (GN/BN) C149-1
      C135-28 GD120 (BK/GN) C149-2
      C135-2 CCA22 (GY/YE) C149-3
      Fig 2: Measuring Resistance Between ABS Module C135, Harness Side And Brake Booster Vacuum Sensor C149, Harness Side
      G06453253Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
      • Yes  : GO to I9.
      • No  : REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.
  9. I9 CHECK THE BRAKE BOOSTER VACUUM SENSOR CIRCUITS FOR A SHORT TOGETHER 
    • Measure the resistance between:
      • brake booster vacuum sensor C149-1, circuit VCA22 (GN/BN), harness side and brake booster vacuum sensor C149-2, circuit GD120 (BK/GN), harness side.
      • brake booster vacuum sensor C149-1, circuit VCA22 (GN/BN), harness side and brake booster vacuum sensor C149-3, circuit CCA22 (GY/YE), harness side.
      • brake booster vacuum sensor C149-2, circuit GD120 (BK/GN), harness side, and brake booster vacuum sensor C149-3, circuit CCA22 (GY/YE), harness side.
      Fig 3: Measuring Resistance Between Brake Booster Vacuum Sensor C149-1, Circuit VCA22 (GN/BN) And Brake Booster Vacuum Sensor C149-2, Circuit GD120 (BK/GN)
      G06453254Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10, 000 ohms? 
      • Yes  : GO to I10.
      • No  : REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.
  10. I10 CHECK THE ACTIVE BRAKE BOOSTER VACUUM SENSOR CIRCUITS FOR A SHORT TO VOLTAGE 
    • Ignition ON.
    • Measure the voltage between ground and:
      • brake booster vacuum sensor C149-1, circuit VCA22 (GN/BN), harness side.
      • brake booster vacuum sensor C149-2, circuit GD120 (BK/GN), harness side.
      • brake booster vacuum sensor C149-3, circuit CCA22 (GY/YE), harness side.
      Fig 4: Measuring Voltage Between Ground And Brake Booster Vacuum Sensor C149-1, Circuit VCA22 (GN/BN), Harness Side
      G06453255Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
      • Yes  : REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test.
      • No  : GO to I11.
  11. I11 CHECK THE BRAKE BOOSTER VACUUM SENSOR CONNECTOR 
    • Ignition OFF.
    • Check brake booster vacuum sensor connector for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect: Brake Booster Vacuum Sensor C149.
    • Make sure the connector seats correctly, then operate the system and verify the concern is still present.
    • Is the concern still present? 
      • Yes  : INSTALL a new vacuum sensor. REFER to POWER BRAKE ACTUATION . CLEAR the DTCs. REPEAT the self-test. If DTC C109E or C109F return, GO to I12.
      • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
  12. I12 CHECK THE ABS MODULE CONNECTORS 
    • Ignition OFF.
    • Disconnect: ABS Module C135.
    • Check ABS module connector for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect: ABS Module C135.
    • Make sure the connector seats correctly, then operate the system and verify the concern is still present.
    • Is the concern still present? 
      • Yes  : INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module  . TEST the system for normal operation.
      • No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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