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PINPOINT TEST J: DTCs B108A:01 AND B1142:29

NOTE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
  1. J1 IDENTIFY THE IGNITION SYSTEM 
    • Verify that the vehicle is equipped with a start/stop switch.
    • Is the vehicle equipped with a start/stop switch? 
      • Yes:  GO to  J6.
      • No:  GO to J2  .
  2. J2 CHECK THE IGNITION SWITCH STATE (IGN_SW_STATE) PID 
    • Ignition ON.
    • Enter the following diagnostic mode on the scan tool: DataLogger - BCM  .
    • Monitor the IGN_SW_STATE PID while turning the ignition switch through all 4 positions (OFF, ACC, RUN and START).
    • Does the PID match each ignition switch position? 
      • Yes:  GO to  J13.
      • No:  GO to J3  .
  3. J3 CHECK THE ACC CIRCUIT FOR AN OPEN OR SHORT TO VOLTAGE 
    • Ignition In ACC.
    • Monitor the IGN_SW_STATE PID with the ignition switch in the ACC position.
    • Does the PID display "Acc"? 
      • Yes:  GO to J4  .
      • No:  If the PID displays "Off" or "Unknown", REPAIR circuit CDC33 (VT/GN) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the PID displays "Run" or "Start", REPAIR circuit CDC34 (WH/OG) (RUN) or CDC35 (BU/WH) (START) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  4. J4 CHECK THE RUN CIRCUIT FOR AN OPEN OR SHORT TO VOLTAGE 
    • Ignition ON.
    • Monitor the IGN_SW_STATE PID with the ignition switch in the RUN position.
    • Does the PID display "Run"? 
      • Yes:  GO to J5  .
      • No:  If the PID displays "Off" or "Unknown", REPAIR circuit CDC34 (WH/OG) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the PID displays "Acc" or "Start", REPAIR circuit CDC33 (VT/GN) (ACC) or CDC35 (BU/WH) (START) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  5. J5 CHECK THE START CIRCUIT FOR AN OPEN OR SHORT TO VOLTAGE 
    • Monitor the IGN_SW_STATE PID with the ignition switch in the START position.
    • Does the PID display "Start"? 
      • Yes:  GO to  J13.
      • No:  If the PID displays "Off" or "Unknown", REPAIR circuit CDC35 (BU/WH) for an open. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If the PID displays "Acc" or "Run", REPAIR circuit CDC33 (VT/GN) (ACC) or CDC34 (WH/OG) (RUN) for a short to voltage. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  6. J6 REVIEW THE RFA MODULE DTCs 
    • Review the RFA  module DTCs retrieved during Inspection and Verification.
    • Is DTC B108A:12 present? 
      • Yes:  DIAGNOSE DTC B108A:12 first. GO to PINPOINT TEST K .
      • No:  GO to J7  .
  7. J7 CHECK THE START/STOP SWITCH 
    • Disconnect: Start/Stop Switch C2195.
    • Carry out the start/stop switch component test.

      Refer to appropriate SYSTEM WIRING DIAGRAMS article for component testing.

    • Does the switch pass the test? 
      • Yes:  GO to J8  .
      • No:  INSTALL a new start/stop switch. REFER to START/STOP SWITCH . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  8. J8 CHECK FOR VOLTAGE TO THE START/STOP SWITCH 
    • Measure the voltage between start/stop switch C2195-4, circuit SBP28 (BU/RD), harness side and ground.
      Fig 1: Identifying Measuring Voltage Between Start/Stop Switch C2195-4 And Ground Connector Terminal Identification
      G07397746Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
      • Yes:  GO to J9  .
      • No:  VERIFY BCM  fuse 28 (15A) is OK. If OK, REPAIR circuit SBP28 (BU/RD). If not OK, REFER to the appropriate SYSTEM WIRING DIAGRAMS article to identify the possible cause of the circuit short. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  9. J9 CHECK THE BCM START/STOP SWITCH VOLTAGE INPUT CIRCUIT FOR AN OPEN 
    • Disconnect: BCM  C2280B.
    • Measure the resistance between start/stop switch C2195-1, circuit CPK34 (BN/VT), harness side BCM  C2280B-41, circuit CPK34 (BN/VT), harness side.
      Fig 2: Identifying Measuring Resistance Between Start/Stop Switch C2195-1 BCM C2280B-41 Connector Terminal Identification
      G07397747Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
      • Yes:  GO to J10  .
      • No:  REPAIR circuit CPK34 (BN/VT). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  10. J10 CHECK THE BCM START/STOP SWITCH GROUND INPUT CIRCUIT FOR AN OPEN 
    • Measure the resistance between start/stop switch C2195-6, circuit CPK35 (YE/OG), harness side BCM  C2280B-44, circuit CPK35 (YE/OG), harness side.
      Fig 3: Identifying Measuring Resistance Between Start/Stop Switch And BCM Connector Terminal Identification
      G07397748Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
      • Yes:  GO to J11  .
      • No:  REPAIR circuit CPK35 (YE/OG). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  11. J11 CHECK THE BCM START/STOP SWITCH GROUND INPUT CIRCUIT FOR A SHORT TO GROUND 
    • Measure the resistance between start/stop switch C2195-6, circuit CPK35 (YE/OG), harness side and ground.
      Fig 4: Identifying Measuring Resistance Between Start/Stop Switch And Ground Connector Terminal Identification
      G07397749Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
      • Yes:  GO to J12  .
      • No:  REPAIR circuit CPK35 (YE/OG). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  12. J12 CHECK THE START/STOP SWITCH GROUND CIRCUIT FOR AN OPEN 
    • Measure the resistance between start/stop switch C2195-3, circuit GD115 (BK/GY), harness side and ground.
      Fig 5: Identifying Measuring Resistance Between Start/Stop Switch And Ground Connector Terminal Identification
      G07397750Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
      • Yes:  GO to J13  .
      • No:  REPAIR circuit GD115 (BK/GY). CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  13. J13 CHECK FOR CORRECT BCM OPERATION 
    • Disconnect: All BCM  Connectors.
    • Check BCM  connectors for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect: All BCM  Connectors.
    • Connect: Start/Stop Switch C2195 (if previously disconnected).
    • Make sure the connectors are seated correctly, then carry out a BCM  self-test.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
      • Yes:  INSTALL a new BCM  . REFER to MULTIFUNCTION ELECTRONIC MODULES . REPEAT the self-test. 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. TEST the system for normal operation.
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