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Visual Inspection and Diagnostic Pre-checks

WARNING: This page is about a different car, the 2019 Ford F-550 Super Duty, 2019 Ford F-450 Super Duty, 2019 Ford F-350 Super Duty, and 2019 Ford F-250 Super Duty. 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 cause damage to the connector.
  1. V1: CHECK FOR DTC C0047:16, C0047:1C, C0047:1E AND C0047:64 
    • Ignition ON, engine OFF.

      Carry out the ABS self-test.

    • Is DTC C0047:16, C0047:1C, C0047:1E or C0047:64 present? 
    Yes No
    Go to PINPOINT TEST C . Go to  V2.
  2. V2: CHECK FOR DTC P258A:14 
    • Review the results form the ABS module self-test.
    • Is DTC P258A:14 present? 
    Yes No
    Go to  V7. Go to  V3.
  3. V3: CHECK THE BRAKE BOOSTER AND VACUUM HOSES FOR LEAKS 
    • Verify all the vacuum hoses are fully connected to their ports.
    • Inspect the following items for leaks:
      • brake booster body
      • brake booster-to-master cylinder seal
      • booster shell at master cylinder seal
      • brake booster-to-bulkhead seal
      • brake booster vacuum sensor seal
      • brake booster-to-vacuum pump hose
    • Are all hoses connected and are all items free of any leaks? 
    Yes No
    Go to  V4. CONNECT or INSTALL new components as necessary.
  4. V4: CHECK THE ABS MODULE VACUUM/PRESSURE SENSOR SIGNAL 1 (VAC_PRS_S1) PID 
    • Ignition ON, engine running.
    • Access the ABS and monitor the VAC_PRS_S1 (PRESS) PID.
    • Apply and release the brake pedal while monitoring the PID.
    • Does the PID display change when the pedal is applied? 
    Yes No
    Go to  V5. Go to PINPOINT TEST C .
  5. V5: CHECK THE BRAKE VACUUM PUMP RELAY 
    • Ignition OFF.
    • Remove the vacuum pump relay.
    • Substitute a known good relay.
    • Ignition ON, engine OFF.
    • Does the vacuum pump continue to run? 
    Yes No
    REMOVE the known good relay.
    Go to  V6.    		 REMOVE the known good relay. INSTALL a new brake vacuum pump relay.
  6. V6: CHECK THE BRAKE VACUUM PUMP RELAY OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE 
    • Measure the voltage between:
      (+) Vacuum Pump Relay Relay Connector, Harness Side (-)
      VPRO Ground
    • Is any voltage present? 
    Yes No
    REPAIR the circuit. Go to  V7.
  7. V7: CHECK THE BRAKE VACUUM PUMP RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Remove the brake vacuum pump relay (if not previously removed).
    • ABS Module connector disconnected. (C135)
    • Measure the resistance between:
      (+) Vacuum Pump Relay Relay Connector, Harness Side (-)
      VPRC Ground
    • Is the resistance greater than 10, 000 ohms? 
    Yes No
    Go to  V8. REPAIR the circuit.
  8. V8: CHECK THE VACUUM IN THE BRAKE BOOSTER 
    • ABS Module connector connected. (C135)
    • Ignition ON, engine OFF.
      NOTE: Subtract 3.3863 kPa (1 in-Hg) from the reading for every 304.8 m (1, 000 ft.) of elevation above sea level.
    • Access the ABS and monitor the VAC_PRS_S1 (PRESS) PID.
      NOTE: 100mbar = 10 kPa = 3 in Hg
    • Is the PID displaying higher than 71.11 kPa (21 in-Hg)? 
    Yes No
    Go to  V9. The elevation in your area is causing the brake vacuum pump to run continuously. This is a normal condition.
  9. V9: CHECK FOR CORRECT ABS MODULE OPERATION 
    • Ignition OFF.
    • ABS Module connector disconnected. (C135) (if not previously disconnected)
    • Using a good light source, inspect all disconnected electrical connectors for the following:
      • corrosion - install new connector or terminal and clean the module pins
      • damaged or bent pins - install new terminals or pins
      • pushed-out pins - install new pins as necessary
      • spread terminals - install new terminals as necessary
    • Reconnect the ABS module connector. Make sure it seats and latches correctly.
    • Operate the system and determine if the concern is still present.
    • Is the concern still present? 
    Yes No
    INSTALL a new ABS module.
    CHECK OASIS for any service articles: TSB, GSB, SSM or FSA.
    If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions.
    If no services articles address this concern, INSTALL a new ABS module. REFER to the Anti-Lock Brake System (ABS) and Stability Control article.
    ORDER a replacement ABS module and INCLUDE the RVC on the form.
    If this is a Ford paid repair, INCLUDE the RVC on the warranty claim form.    		 The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.
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