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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? 
    1. YES  : Go to  A2.
    2. NO  : REFER to EXTERIOR LIGHTING article.
  2. A2 TEST FUSE C34 (30A) 
    • Check fuse: Fuse C34 (30A) Power Distribution Box
    • Is the resistance of the fuse 5 ohms or less? 
    1. YES  : Go to  A3.
    2. NO  : REFER to STARTING SYSTEM article.
  3. A3 TEST FUSE C18 (10A) 
    • Check fuse: Fuse C18 (10A) Smart Junction Box
    • Is the resistance of the fuse 5 ohms or less? 
    1. YES  : Go to  A4.
    2. NO  : REFER to STARTING SYSTEM article.
  4. A4 TEST CIRCUIT 1050 (LG/PK) FOR SHORT TO GROUND 
    • Disconnect: Ignition Switch C250
      • Fig 1: Checking Circuit For Short To Ground
      GF0017822Courtesy of FORD MOTOR CO.
    • Measure the resistance between ignition switch C250 pin 1, circuit 1050 (LG/PK) harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  A5.
    2. 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
      • Fig 2: Checking Circuit For Open
      GF0017823Courtesy of FORD MOTOR CO.
    • Measure the resistance between SJB C2280b pin 32, circuit 1050 (LG/PK), harness side and ignition switch C250 pin 1, harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A6.
    2. 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
      • Fig 3: Checking Circuit For Voltage
      GF0017824Courtesy of FORD MOTOR CO.
    • Measure the voltage between BPP switch C278 pin 1, circuit 1140e (PK), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  A7.
    2. 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
      • Fig 4: Checking Circuit For Short To Ground
      GF0017825Courtesy of FORD MOTOR CO.
    • Measure the resistance between BPP switch C278 pin 2, circuit 1140e (PK), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  A8.
    2. 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
      • Fig 5: Checking Circuit For Open
      GF0017826Courtesy of FORD MOTOR CO.
    • Measure the resistance between SJB C2280a pin 27 and BPP switch C278 pin 2, circuit 1140e (PK), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A9.
    2. NO  : REPAIR circuit 1140e (PK). TEST the system for normal operation.
  9. A9 TEST THE BRAKE PEDAL POSITION (BPP) SWITCH 
      Fig 6: Checking Brake Pedal Position (BPP) Switch
      GF0017827Courtesy of FORD MOTOR CO.
    • Measure the resistance between BPP switch C278 pin 1 and pin 2, while OPEN (off) and CLOSED (on).
    • Is the resistance of the switch greater than 10,000 ohms while OFF and 5 ohms or less while ON? 
    1. YES  : Go to  A10.
    2. 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
      • Fig 7: Checking Circuit For Short To Ground
      GF0017828Courtesy of FORD MOTOR CO.
    • Measure the resistance between floor shifter harness assembly C3245 pin 1, circuit 810 (RD/LG), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  A11.
    2. NO  : REPAIR circuit 810 (RD/LG). TEST the system for normal operation.
  11. A11 TEST CIRCUIT 810 (RD/LG) FOR AN OPEN 
      Fig 8: Checking Circuit For Open
      GF0017829Courtesy of FORD MOTOR CO.
    • 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.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A12.
    2. 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.
      • Fig 9: Checking Circuit For Voltage
      GF0017830Courtesy of FORD MOTOR CO.
    • Measure the voltage on floor shifter harness assembly C3245 pin 1, circuit 810 (RD/LG), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : REPAIR circuit 810 (RD/LG). TEST the system for normal operation.
    2. NO  : Go to  A13.
  13. A13 TEST CIRCUIT 409 (TN/BK) FOR A SHORT TO GROUND 
    • Disconnect: Floor Shifter Harness Assembly C3245
      • Fig 10: Checking Circuit For Short To Ground
      GF0017831Courtesy of FORD MOTOR CO.
    • Measure the resistance between floor shifter harness assembly C3245 pin 8, circuit 409 (TN/BK), harness side and ground.
    • Is the resistance less than 10,000 ohms? 
    1. YES  : REPAIR circuit 409 (TN/BK). TEST the system for normal operation.
    2. NO  : Go to  A14.
  14. A14 TEST CIRCUIT 409 (TN/BK) FOR AN OPEN 
    • Disconnect: Ignition Switch C250
    • Disconnect: Floor Shifter Harness Assembly C3245
      • Fig 11: Checking Circuit For Open
      GF0017832Courtesy of FORD MOTOR CO.
    • Measure the resistance between floor shifter harness assembly C3245 pin 8, and ignition switch C250 pin 3, circuit 409 (TN/BK), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : REPAIR circuit 409 (TN/BK). TEST the system for normal operation.
    2. NO  : Go to  A15.
  15. A15 TEST CIRCUIT 1205NZ (BK) FOR A SHORT TO GROUND 
    • Disconnect: Floor Shifter Harness Assembly C3245
      • Fig 12: Checking Circuit For Short To Ground
      GF0017833Courtesy of FORD MOTOR CO.
    • Measure the resistance between floor shifter harness assembly C3245 pin 4, circuit 1205NZ (BK), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : INSTALL a new selector lever, REFER to Selector Lever . TEST the system for normal operation.
    2. NO  : REPAIR circuit 1205NZ (BK). TEST the system for normal operation.
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