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

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
  1. A1 TEST THE BRAKE LIGHTS 
    • Apply brake pedal and view brake lights.
    • Do brake lights illuminate? 
    • Yes  : GO to  A7.
    • No  : GO to A2.
  2. A2 TEST FUSE 30 (15A) 
    • Key in OFF position.
    • Check fuse: BJB Fuse 50 (15A).
    • Is resistance of fuse 5 ohms or less? 
    • Yes  : GO to  A4.
    • No  : GO to A3.
  3. A3 TEST THE CIRCUIT FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Brake Pedal Position (BPP) Switch.
    • Measure the resistance pin 2 and ground.
      Fig 1: Measuring Resistance Pin 2 And Ground
      G03949390Courtesy of FORD MOTOR CO.
    • Is the resistance 10 ohms or less? 
    • Yes  : REPAIR circuit for short to ground. TEST the system for normal operation.
    • No  : GO to A4.
  4. A4 TEST THE CIRCUIT FOR AN OPEN 
    • Measure the resistance between output side of fuse 50 (15A) and brake pedal position switch connector pin 2.
      Fig 2: Measuring Resistance Between Output Side Of Fuse 50 (15A) And Brake Pedal Position Switch Connector Pin 2
      G03949391Courtesy of FORD MOTOR CO.
    • Is the resistance 5 ohms or less? 
    • Yes  : GO to A5.
    • No  : REPAIR circuit for open. TEST the system for normal operation.
  5. A5 TEST THE BRAKE PEDAL POSITION (BPP) SWITCH 
    • Measure the resistance of brake pedal position switch while open (OFF) and closed (ON).
      Fig 3: Measuring Resistance Of Brake Pedal Position Switch While Open (OFF) And Closed (ON)
      G03949392Courtesy of FORD MOTOR CO.
    • Is resistance of switch greater than 10 ohms while OFF and 5 ohms or less while ON? 
    • Yes  : GO to A6.
    • No  : INSTALL a new switch. TEST the system for normal operation.
  6. A6 TEST THE CIRCUIT FOR A SHORT TO GROUND 
    • Disconnect: Shift Lock Actuator.
    • Measure the resistance of pin 2 and ground.
      Fig 4: Measuring Resistance Of Pin 2 And Ground
      G03949393Courtesy of FORD MOTOR CO.
    • Is resistance 10 ohms or less? 
    • Yes  : REPAIR circuit for short to ground. TEST the system for normal operation.
    • No  : GO to A7.
  7. A7 TEST THE CIRCUIT 810 FOR AN OPEN 
    • Measure the resistance between shift lock actuator pin 2 and brake pedal position switch connector pin 1.
      Fig 5: Measuring Resistance Between Shift Lock Actuator Pin 2 And Brake Pedal Position Switch Connector Pin 1
      G03949394Courtesy of FORD MOTOR CO.
    • Is resistance 5 ohms or less? 
    • Yes  : GO to A8.
    • No  : REPAIR circuit for open. TEST the system for normal operation.
  8. A8 TEST FOR B+ 
    • Key in ON position.
    • Measure the voltage at shift lock actuator pin 3 and ground.
      Fig 6: Measuring Voltage At Shift Lock Actuator Pin 3 And Ground
      G03949395Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to  A12.
    • No  : GO to A9.
  9. A9 TEST FUSE 15 (7.5A) 
    • Key in OFF position.
    • Check fuse: Fuse 15 (7.5A).
    • Is resistance of fuse 5 ohms or less? 
    • Yes  : GO to  A11.
    • No  : GO to A10.
  10. A10 TEST THE CIRCUIT FOR A SHORT TO GROUND 
    • Measure the resistance at pin 3 and ground.
      Fig 7: Measuring Resistance At Pin 3 And Ground
      G03949396Courtesy of FORD MOTOR CO.
    • Is resistance 10 ohms or less? 
    • Yes  : REPAIR circuit for short to ground. TEST the system for normal operation.
    • No  : GO to A11.
  11. A11 TEST THE CIRCUIT FOR AN OPEN 
    • Measure the resistance between output side of fuse 15 (7.5A) and the shift lock actuator pin 3.
      Fig 8: Measuring Resistance Between Output Side Of Fuse 15 (7.5A) And Shift Lock Actuator Pin 3
      G03949397Courtesy of FORD MOTOR CO.
    • Is resistance 5 ohms or less? 
    • Yes  : GO to A12.
    • No  : REPAIR circuit for open. TEST the system for normal operation.
  12. A12 CHECK THE CIRCUIT FOR AN OPEN 
    • Measure the resistance of shift lock actuator pin 1 and ground.
      Fig 9: Measuring Resistance Of Shift Lock Actuator Pin 1 And Ground
      G03949398Courtesy of FORD MOTOR CO.
    • Measure the resistance of shift lock actuator pin 6 and ground.
      Fig 10: Measuring Resistance Of Shift Lock Actuator Pin 6 And Ground
      G03949399Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes  : Shift lock actuator is not serviced. INSTALL a new steering column. REFER to STEERING SYSTEM-GENERAL INFORMATION . TEST the system for normal operation.
    • No  : REPAIR circuit for open. TEST the system for normal operation.
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