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Pinpoint Test A: The Shift Interlock System Does Not Release/Lock Correctly

  1. A1 TEST THE BRAKE LIGHTS 
    • Apply the brake pedal and view the brake lights.
    • Do the brake lights illuminate? 
  2. A2 TEST FUSE C34 (30A) 
    • Check fuse: Fuse C34 (30A) Power Distribution Box.
    • Is the resistance of the fuse 5 ohms or less? 
  3. A3 TEST FUSE C18(10A) 
    • Check fuse: Fuse C18 (10A) Smart Junction Box.
    • Is the resistance of the fuse 5 ohms or less? 
  4. A4 TEST CIRCUIT 1050 (LG/PK) FOR SHORT TO GROUND 
    • Disconnect: Ignition Switch C250.
    • Measure the resistance between ignition switch C250 pin 1, circuit 1050 (LG/PK) harness side and ground.
      Fig 1: Testing Circuit 1050 (LG/PK) For Short To Ground
      G03991949Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : GO to A5.
    • No  : REPAIR circuit 1050 (LG/PK). TEST the system for normal operation.
  5. A5 TEST CIRCUIT 1050 (LG/PK) FOR AN OPEN 
    • Disconnect: Ignition Switch C250.
    • Disconnect: Smart Junction Box (SJB) C2280b.
    • Measure the resistance between SJB C2280b pin 32, circuit 1050 (LG/PK), harness side and ignition switch C250 pin 1, harness side.
      Fig 2: Testing Circuit 1050 (LG/PK) For An Open
      G03991950Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to A6.
    • No  : REPAIR circuit 1050 (LG/PK). TEST the system for normal operation.
  6. A6 TEST CIRCUIT 1140e (PK) FOR BATTERY VOLTAGE 
    • Key in OFF position.
    • Disconnect: Brake Pedal Position (BPP) Switch C278.
    • Measure the voltage between BPP switch C278 pin 1, circuit 1140e (PK), harness side and ground.
      Fig 3: Testing Circuit 1140E (PK) For Battery Voltage
      G03991951Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to A7.
    • No  : REPAIR circuit 1140e (PK). TEST the system for normal operation.
  7. A7 TEST CIRCUIT 1140e (PK) FOR A SHORT TO GROUND 
    • Disconnect: Brake Pedal Position (BPP) Switch C278.
    • Measure the resistance between BPP switch C278 pin 2, circuit 1140e (PK), harness side and ground.
      Fig 4: Testing Circuit 1140E (PK) For Short To Ground
      G03991952Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : GO to A8.
    • No  : REPAIR circuit 1140e (PK). TEST the system for normal operation.
  8. A8 TEST CIRCUIT 1140e (PK) FOR AN OPEN 
    • Disconnect: Smart Junction Box (SJB) C265.
    • Measure the resistance between SJB C2280a pin 27 and BPP switch C278 pin 2, circuit 1140e (PK), harness side.
      Fig 5: Testing Circuit 1140E (PK) For An Open
      G03991953Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to A9.
    • No  : REPAIR circuit 1140e (PK). TEST the system for normal operation.
  9. A9 TEST THE BRAKE PEDAL POSITION (BPP) SWITCH 
    • Measure the resistance between BPP switch C278 pin 1 and pin 2, while OPEN (off) and CLOSED (on).
      Fig 6: Testing Brake Pedal Position (BPP) Switch
      G03991954Courtesy of FORD MOTOR CO.
    • Is the resistance of the switch greater than 10,000 ohms while OFF and 5 ohms or less while ON? 
    • Yes  : GO to A10.
    • No  : INSTALL a new BPP switch. TEST the system for normal operation.
  10. A10 TEST CIRCUIT 810 (RD/LG) FOR A SHORT TO GROUND 
    • Disconnect: Floor Shifter Harness Assembly C3245.
    • Measure the resistance between floor shifter harness assembly C3245 pin 1, circuit 810 (RD/LG), harness side and ground.
      Fig 7: Testing Circuit 810 (RD/LG) For Short To Ground
      G03991955Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : GO to A11.
    • No  : REPAIR circuit 810 (RD/LG). TEST the system for normal operation.
  11. A11 TEST CIRCUIT 810 (RD/LG) FOR AN OPEN 
    • Measure the resistance between BPP switch C278 pin 1, circuit 810 (RD/LG), harness side and floor shifter harness assembly C3245 pin 1, circuit 810 (RD/LG), harness side.
      Fig 8: Testing Circuit 810 (RD/LG) For An Open
      G03991956Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to A12.
    • No  : REPAIR circuit 810. TEST the system for normal operation.
  12. A12 TEST CIRCUIT 810 (RD/LG) FOR BATTERY VOLTAGE 
    • Connect: Brake Pedal Position (BPP) Switch C278.
    • Disconnect: Floor Shifter Harness Assembly C3245.
    • Depress the brake pedal.
    • Measure the voltage on floor shifter harness assembly C3245 pin 1, circuit 810 (RD/LG), harness side and ground.
      Fig 9: Testing Circuit 810 (RD/LG) For Battery Voltage
      G03991957Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : REPAIR circuit 810 (RD/LG). TEST the system for normal operation.
    • No  : GO to A13.
  13. A13 TEST CIRCUIT 409 (TN/BK) FOR A SHORT TO GROUND 
    • Disconnect: Floor Shifter Harness Assembly C3245.
    • Measure the resistance between floor shifter harness assembly C3245 pin 8, circuit 409 (TN/BK), harness side and ground.
      Fig 10: Testing Circuit 409 (TN/BK) For Short To Ground
      G03991958Courtesy of FORD MOTOR CO.
    • Is the resistance less than 10,000 ohms? 
    • Yes  : REPAIR circuit 409 (TN/BK). TEST the system for normal operation.
    • No  : GO to A14.
  14. A14 TEST CIRCUIT 409 (TN/BK) FOR AN OPEN 
    • Disconnect: Ignition Switch C250.
    • Disconnect: Floor Shifter Harness Assembly C3245.
    • Measure the resistance between floor shifter harness assembly C3245 pin 8, and ignition switch C250 pin 3, circuit 409 (TN/BK), harness side.
      Fig 11: Testing Circuit 409 (TN/BK) For An Open
      G03991959Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : REPAIR circuit 409 (TN/BK). TEST the system for normal operation.
    • No  : GO to A15.
  15. A15 TEST CIRCUIT 1205NZ (BK) FOR A SHORT TO GROUND 
    • Disconnect: Floor Shifter Harness Assembly C3245.
    • Measure the resistance between floor shifter harness assembly C3245 pin 4, circuit 1205NZ (BK), harness side and ground.
      Fig 12: Testing Circuit 1205NZ (BK) For Short To Ground
      G03991960Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : INSTALL a new shifter, REFER to SELECTOR LEVER . TEST the system for normal operation.
    • No  : REPAIR circuit 1205NZ (BK). TEST the system for normal operation.
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