PINPOINT TEST C: DTCs C0020:12, C0020:15 AND C0020:71

WARNING: This page is about a different car, the 2013 Ford Mustang. 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.

NOTE: Failure to disconnect the battery when instructed results in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

C1 CHECK THE PUMP MOTOR (PMP_MOTOR) ACTIVE COMMAND
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: ABS Module DataLogger.
- Toggle the PMP_MOTOR active command ON.
- Listen for the ABS pump motor noise, does the ABS pump motor run for approximately 2 seconds?
- Yes : GO to C2.
- No : TOGGLE the PMP_MOTOR active command OFF. GO to C3.
C2 CHECK FOR FAULT REPEATABILITY
- Drive the vehicle at speeds greater than 20 km/h (12 mph).
- Enter the following diagnostic mode on the scan tool: ABS Module Self Test.
- Are DTCs C0020:12, C0020:15 or C0020:71 retrieved?
- Yes : GO to C3.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
C3 CHECK THE ABS MODULE GROUND EYELET AT THE CHASSIS
- Ignition OFF.
- Remove the bolt retaining GD120, in the engine compartment, LH side front.
  - Clean the body mating surface and ground eyelets.
  - Install the ground eyelet to the chassis with the retaining bolt.
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: ABS Module Self-Test.
- Are DTCs C0020:12, C0020:15, C0020:71 retrieved?
- Yes : GO to C4.
- No : The concern was caused by a loose or corroded connector. CLEAR the DTCs. REPEAT self-test.
C4 CHECK THE PUMP MOTOR VOLTAGE SUPPLY TO THE ABS MODULE
- Ignition OFF.
- Disconnect: ABS Module C135.
- Measure the voltage between ABS module C135-1, circuit SBB08 (VT/RD), harness side and ground.
  
  Fig 1: Measuring Voltage Between ABS Module C135-1, Circuit SBB08 (VT/RD) And Ground
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : GO to C5.
- No : VERIFY that BJB fuse 8 (40A) is OK. If OK, REPAIR circuit SBB08 (VT/RD). If not OK, REFER to the OEM WIRING DIAGRAMS to identify the cause of the circuit short. CLEAR the DTCs. REPEAT the self-test.
C5 CHECK THE ABS MODULE GROUND CIRCUITS FOR AN OPEN
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between ABS module C135-13, circuit GD120 (BK/GN), harness side and ground and the ABS module C135-38, circuit GD120 (BK/GN), harness side and ground.
  
  Fig 2: Checking ABS Module Ground Circuits For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to C6.
- No : REPAIR circuit GD120 (BK/GN) for an open circuit.
  CLEAR the DTCs. REPEAT the self-test.
C6 CHECK FOR CORRECT ABS MODULE OPERATION
- Disconnect: ABS Module.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect: ABS Module.
- Make sure the connector is seated 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 . GO to C7.
- 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.
C7 CHECK FOR FAULT REPEATABILITY
- Drive the vehicle at speeds greater than 20 km/h (12 mph).
- Enter the following diagnostic mode on the scan tool: ABS Module Self Test.
- Are DTCs C0020:12, C0020:15, C0020:71 retrieved?
- Yes : INSTALL a new HCU. REFER to HYDRAULIC CONTROL UNIT (HCU) . TEST the system for normal operation.
- No : The repairs are complete. The system is operating correctly at this time.