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

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. A1 CHECK FOR CLUTCH PEDAL POSITION (CPP) JUMPER PLUG ON AUTOMATIC TRANSMISSION EQUIPPED VEHICLES 
    • Inspect CPP jumper plug for correct installation.
    • Is the CPP jumper plug correctly installed? 
    1. Yes  : GO to A2.
    2. No  : INSTALL the CPP jumper plug. TEST the system for normal operation.
  2. A2 TEST THE BRAKE LIGHTS 
    • Apply the brake pedal and view the brake lights.
    • Do the brake lights illuminate? 
    1. Yes  : GO to  A8.
    2. No  : GO to A3.
  3. A3 TEST F2.32 (5A) 
    • Key in OFF position.
    • Check fuse: Fuse F2.32 (5A).
    • Is the resistance less than 5 ohms? 
    1. Yes  : GO to  A5.
    2. No  : GO to A4.
  4. A4 TEST CIRCUIT 276 (BN) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Brake ON/OFF Switch C278.
    • Measure the resistance of circuit 276 (BN) at brake ON/OFF switch C278.
      Fig 1: Testing Circuit 276 (BN) For A Short To Ground
      G03276058Courtesy of FORD MOTOR CO.
    • Is the resistance 10K ohms or less? 
    1. Yes  : REPAIR circuit 276 (BN) for a short to ground. TEST the system for normal operation.
    2. No  : GO to A5.
  5. A5 TEST CIRCUIT 276 (BN) FOR AN OPEN 
    • Measure the resistance between the output side of fuse F2.32 (5A) and the brake ON/OFF switch C278, circuit 276 (BN).
      Fig 2: Testing Circuit 276 (BN) For An Open
      G03276059Courtesy of FORD MOTOR CO.
    • Is resistance 5 ohms or less? 
    1. Yes  : GO to A6.
    2. No  : REPAIR circuit 276 (BN) for an open. TEST the system for normal operation.
  6. A6 TEST THE BRAKE PEDAL POSITION SWITCH 
    • Measure the resistance of the brake pedal position switch while open (OFF) and closed (ON).
      Fig 3: Testing Brake Pedal Position Switch
      G03276060Courtesy of FORD MOTOR CO.
    • Is the resistance of the switch greater than 10K ohms while OFF and 5 ohms or less while ON? 
    1. Yes  : GO to A7.
    2. No  : INSTALL a new brake pedal position switch. TEST the system for normal operation.
  7. A7 TEST CIRCUIT 810 (RD/LG) FOR A SHORT TO GROUND 
    • Disconnect: Shift Lock Actuator C2008.
    • Measure the resistance of circuit 810 (RD/LG), shift lock actuator C2008.
      Fig 4: Testing Circuit 810 (RD/LG) For A Short To Ground
      G03276061Courtesy of FORD MOTOR CO.
    • Is the resistance 10K ohms or less? 
    1. Yes  : REPAIR circuit 810 (RD/LG) for a short to ground. TEST the system for normal operation.
    2. No  : GO to A8.
  8. A8 TEST CIRCUIT 810 (RD/LG) FOR AN OPEN 
    • Measure the resistance of circuit 810 (RD/LG) between the shift lock actuator C2008 and the brake ON/OFF switch C278.
      Fig 5: Testing Circuit 810 (RD/LG) For An Open
      G03276062Courtesy of FORD MOTOR CO.
    • Is the resistance 5 ohms or less? 
    1. Yes  : GO to A9.
    2. No  : REPAIR circuit 810 (RD/LG) for an open. TEST the system for normal operation.
  9. A9 TEST FOR B+ ON CIRCUIT 605 (RD) 
    • Key in ON position.
    • Measure the voltage at the shift lock actuator C2008, circuit 605 (RD).
      Fig 6: Testing For B+ On Circuit 605 (RD)
      G03276063Courtesy of FORD MOTOR CO.
    • Is B+ present? 
    1. Yes  : GO to  A13.
    2. No  : GO to A10.
  10. A10 TEST FUSE F2.20 (10A) 
    • Key in START position.
    • Check fuse: Fuse F2.20 (10A).
    • Is the resistance of the fuse 5 ohms or less? 
    1. Yes  : GO to  A12.
    2. No  : GO to A11.
  11. A11 TEST CIRCUIT 605 (RD) FOR A SHORT TO GROUND 
    • Measure the resistance at shift lock actuator C2008, circuit 605 (RD).
      Fig 7: Testing Circuit 605 (RD) For A Short To Ground
      G03276064Courtesy of FORD MOTOR CO.
    • Is the resistance 10K ohms or less? 
    1. Yes  : REPAIR the circuit for a short to ground. TEST the system for normal operation.
    2. No  : GO to A12.
  12. A12 TEST CIRCUIT 605 (RD) FOR AN OPEN 
    • Measure the resistance of circuit 605 (RD) between the output side of fuse F2.20 (10A) and the shift lock actuator C2008.
      Fig 8: Testing Circuit 605 (RD) For An Open
      G03276065Courtesy of FORD MOTOR CO.
    • Is the resistance 5 ohms or less? 
    1. Yes  : GO to A13.
    2. No  : REPAIR circuit 605 (RD) for an open. TEST the system for normal operation.
  13. A13 TEST CIRCUIT 57 (BK) FOR AN OPEN 
    • Measure the resistance of the shift lock actuator C2008, circuit 57 (BK).
      Fig 9: Testing Circuit 57 (BK) For An Open
      G03276066Courtesy of FORD MOTOR CO.
    • Is the resistance 5 ohms or less? 
    1. Yes  : INSTALL a new shift lock actuator. TEST the system for normal operation.
    2. No  : REPAIR circuit 57 (BK) for an open. TEST the system for normal operation.
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