LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2017 >> Fusion Energi Platinum >> Repair and Diagnosis (Single Page) >> Brakes >> Anti-Lock Brakes >> Anti-Lock Brake System Component Testing (Hybrid/ENERGI) >> Pinpoint Tests >> Pinpoint Tests C: Brake Booster Vacuum Sensor Faults >> Visual Inspection and Diagnostic Pre-checks

Visual Inspection and Diagnostic Pre-checks

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.
Fig 1: Antilock Braking System (ABS) Module Connector - C135
GFDW80265Courtesy of FORD MOTOR COMPANY
CONNECTOR PIN REFERENCE (HARNESS SIDE)

Circuit Pin
VREF (Reference Voltage) - LCA37 44 (YELLOW/ORANGE)
SIGRTN (Signal Return) - RCA37 45 (WHITE/BLUE)
SRef (Signal Reference Voltage) - VCA38 36 (BROWN/VIOLET)
Fig 2: Brake Booster Vacuum Sensor Connector - C149
G11915857Courtesy of FORD MOTOR CO.
CONNECTOR PIN REFERENCE (HARNESS SIDE)

Circuit Pin
VREF (Reference Voltage) - LCA37 3 (YELLOW/ORANGE)
SIGRTN (Signal Return) - RCA37 2 (WHITE/BLUE)
SRef (Signal Reference Voltage) - VCA38 1 (BROWN/VIOLET)
  1. C1: VERIFY ALL WIRING CONNECTIONS 
    • Ignition OFF.
    • ABS Module connector disconnected. (C135)
    • Brake Booster Vacuum Sensor connector disconnected. (C149)
    • Using a good light source, inspect each connector terminal for any corrosion.
    • Inspect both connectors for any pushed-out pins. Refer to OEM Connector Repair Procedures (Hybrid/Energi) .
    • Using a suitable mating terminal, check each female terminal for deformed or enlarged contacts by comparing the mating terminal's fit between each of the following pins:
      • C135-36
      • C135-44
      • C135-45
      • C149-1
      • C149-2
      • C149-3
    • Are both connectors free of corrosion, pushed-out pins and deformed or enlarged contacts? 
      Yes No
      Go to  C2. REPAIR the terminals in question.
  2. C2: CHECK THE ABS MODULE DTCS 
    • ABS Module connector connected. (C135)
    • Brake Booster Vacuum Sensor connector connected. (C149)
    • Ignition ON, engine OFF.
    • Carry out the ABS self-test.
    • Is DTC C0021:09, C0047:26 or C0047:64 present? 
      Yes No
      Go to  C3. Go to  C4.
  3. C3: CHECK THE BRAKE BOOSTER AND VACUUM HOSES FOR LEAKS 
    • Inspect the vacuum hoses, brake booster and brake booster seals for leaks or evidence of leaks.
    • Are the vacuum hoses, brake booster and brake booster seals free from leaks? 
      Yes No
      Go to  C4. REPAIR or INSTALL new components as necessary.
  4. C4: CHECK THE VACUUM SENSOR WIRING FOR A SHORT TO VOLTAGE 
    • Ignition OFF.
    • ABS Module connector disconnected. (C135)
    • Brake Booster Vacuum Sensor connector disconnected. (C149)
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      (+) ABS Module (C135) Connector, Harness Side (-)
      VREF - LCA37 (YELLOW/ORANGE) - Pin 44 Ground
      SIGRTN - RCA37 (WHITE/BLUE) - Pin 45 Ground
      SRef - VCA38 (BROWN/VIOLET) - Pin 36 Ground
    • Measure the voltage between:
      (+) PCM_B (C1915B) Connector, Harness Side (-)
      VAC GND Ground
      VAC SIG Ground
      VAC SNS P Ground
    • Is any voltage present? 
      Yes No
      REPAIR the circuit in question. Go to  C5.
  5. C5: CHECK THE VACUUM SENSOR WIRING FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Measure the resistance between:
      (+) ABS Module (C135) Connector, Harness Side (-)
      VREF - LCA37 (YELLOW/ORANGE) - Pin 44 Ground
      SIGRTN - RCA37 (WHITE/BLUE) - Pin 45 Ground
      SRef - VCA38 (BROWN/VIOLET) - Pin 36 Ground
    • Measure the resistance between:
      (+) PCM B (C1915B) Connector, Harness Side (-)
      VAC GND Ground
      VAC SIG Ground
      VAC SNS P Ground
    • Are the resistances greater than 10, 000 ohms? 
      Yes No
      Go to  C6. REPAIR the circuit in question.
  6. C6: CHECK THE VACUUM SENSOR WIRING FOR AN OPEN 
    • Measure the resistance between:
      (+) ABS Module (C135) Connector, Harness Side (-) Brake Booster Vacuum Sensor (C149) Connector, Harness Side
      VREF - LCA37 (YELLOW/ORANGE) - Pin 44 VREF - LCA37 - Pin 3
      SIGRTN - RCA37 (WHITE/BLUE) - Pin 45 SIGRTN - RCA37 - Pin 2
      SRef - VCA38 (BROWN/VIOLET) - Pin 36 SRef - VCA38 - Pin 1
    • Measure the resistance between:
      (+) PCM_B (C1915B) Connector, Harness Side (-) Brake Booster Vacuum Sensor (C149) Connector, Harness Side
      VAC GND VAC GND
      VAC SIG VAC SIG
      VAC SNS P VAC SNS P
    • Are the resistances less than 3 ohms? 
      Yes No
      Go to  C7. REPAIR the circuit in question.
  7. C7: CHECK THE VACUUM SENSOR WIRING FOR A SHORT TOGETHER 
    • Measure the resistance between:
      (+) ABS Module (C135) Connector, Harness Side (-) ABS Module (C135) Connector, Harness Side
      SIGRTN - RCA37 (WHITE/BLUE) - Pin 45 SRef - VCA38 - Pin 36
      SIGRTN - RCA37 (WHITE/BLUE) - Pin 45 VREF - LCA37 - Pin 44
      SRef - VCA38 (BROWN/VIOLET) - Pin 36 VREF - LCA37 - Pin 44
    • Measure the resistance between:
      (+) PCM_B (C1915B) Connector, Harness Side (-) PCM_B (C1915B) Connector, Harness Side
      VAC GND VAC SIG
      VAC GND VAC SNS P
      VAC SIG VAC SNS P
    • Are the resistances greater than 10, 000 ohms? 
      Yes No
      Go to  C8. REPAIR the circuits in question.
  8. C8: CHECK THE ABS MODULE OUTPUT 
    • ABS Module connector connected. (C135) Make sure the connector seats and latches correctly.
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      (+) Brake Booster Vacuum Sensor (C149) Connector, Harness Side (-)
      VREF - LCA37 (YELLOW/ORANGE) - Pin 3 Ground
    • Is the voltage approximately 4.7 volts? 
      Yes No
      INSTALL a new brake booster vacuum sensor. Go to  C9.
  9. C9: CHECK FOR CORRECT ABS MODULE OPERATION 
    • Ignition OFF.
    • ABS Module connector disconnected. (C135)
    • Inspect all disconnected electrical connectors for the following, repair as necessary:
      • 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
    • ABS Module connector connected. (C135) Make sure the connector seats and latches correctly.
    • Brake Booster Vacuum Sensor connector connected. (C149) Make sure the connector 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 applicable 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 service actions address this concern, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) And Stability Control (Hybrid/Energi) .
      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.
      When complete, SELECT the "X" in the top right corner to CLOSE this procedure and RETURN to the PTS web site.      		 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.
      If this is a Ford paid repair, INCLUDE the RVC on the warranty claim form.
      When complete, SELECT the "X" in the top right corner to CLOSE this procedure and RETURN to the PTS web site.
  10. C10: CHECK THE ABS MODULE OUTPUT 
    • PCM_B connector connected. (C1915B) Make sure the connector seats and latches correctly.
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      (+) Brake Booster Vacuum Sensor (C149) Connector, Harness Side (-)
      VAC SNS P Ground
    • Is the voltage approximately 4.7 volts? 
      Yes No
      INSTALL a new brake booster vacuum sensor. Go to  C11.
  11. C11: CHECK FOR CORRECT PCM OPERATION 
    • Ignition OFF.
    • PCM_B connector disconnected. (C1915B)
    • Inspect all disconnected electrical connectors for the following, repair as necessary:
      • 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
    • PCM_B connector connected. (C1915B) Make sure the connector seats and latches correctly.
    • Brake Booster Vacuum Sensor connector connected. (C149) Make sure the connector 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 PCM.
      CHECK OASIS for any applicable 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 service actions address this concern, INSTALL a new PCM. REFER to Electronic Engine Controls article.      		 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.
      If this is a Ford paid repair, INCLUDE the RVC on the warranty claim form.
      When complete, SELECT the "X" in the top right corner to CLOSE this procedure and RETURN to the PTS web site.
scientia non olet · About LEMON Manuals