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

WARNING: This page is about a different car, the 2005 Ford RV Cutaway, 2005 Ford Econoline, 2005 Ford E450 Super Duty, and 2005 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. A1 TEST 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 F2.11 (15A) 
    • Key in OFF position.
    • Check fuse: CJB Fuse F2.11 (15A).
    • Is the resistance 5 ohms or less? 
    • Yes  : GO to  A4.
    • No  : GO to A3.
  3. A3 TEST CIRCUIT 10 (LG/RD) FOR SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Brake Pedal Position (BPP) Switch C278.
    • Measure the resistance of circuit 10 (LG/RD) at C278.
      Fig 1: Measuring Resistance Of Circuit 10 (LG/RD) At C278
      G03889689Courtesy of FORD MOTOR CO.
    • Is the resistance 10,000 ohms or less? 
    • Yes  : REPAIR circuit 10 (LG/RD) for short to ground. TEST the system for normal operation.
    • No  : GO to A4.
  4. A4 TEST CIRCUIT 10 (LG/RD) FOR OPEN 
    • Measure the resistance between output side of fuse F2.11 (15A) and brake pedal position switch C278, circuit 10 (LG/RD).
      Fig 2: Measuring Resistance Between Output Side Of Fuse And Brake Pedal Position Switch For Open Circuit
      G03889690Courtesy of FORD MOTOR CO.
    • Is the resistance 5 ohms or less? 
    • Yes  : GO to A5.
    • No  : REPAIR circuit 10 (LG/RD) for open. TEST the system for normal operation.
  5. A5 TEST BRAKE PEDAL POSITION 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)
      G03889691Courtesy 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 A6.
    • No  : INSTALL a new brake pedal position switch. TEST the system for normal operation.
  6. A6 TEST CIRCUIT 511 (LG) FOR SHORT TO GROUND 
    • Disconnect: Shift Lock Actuator C2008.
    • Measure the resistance of circuit 511 (LG), pin C2008-3.
      Fig 4: Measuring Resistance Of Circuit 511 (Lg), Pin C2008-3 To Ground
      G03889692Courtesy of FORD MOTOR CO.
    • Is the resistance 10,000 ohms or less? 
    • Yes  : REPAIR circuit 511 (LG) for short to ground. TEST the system for normal operation.
    • No  : GO to A7.
  7. A7 TEST CIRCUIT 511 (LG) FOR OPEN 
    • Measure the resistance of circuit 511 (LG) between shift lock actuator C2008-3 and brake pedal position switch C278.
      Fig 5: Measuring Resistance Between Shift Lock Actuator And Brake Pedal Position Switch For Open Circuit
      G03889693Courtesy of FORD MOTOR CO.
    • Is the resistance 5 ohms or less? 
    • Yes  : GO to A8.
    • No  : REPAIR circuit 511 (LG) for open. TEST the system for normal operation.
  8. A8 TEST FOR B+ ON CIRCUIT 298 (BK/OG) 
    • Key in ON position.
    • Measure the voltage at shift lock actuator pin C2008-1, circuit 298 (BK/OG).
      Fig 6: Measuring Voltage At Shift Lock Actuator To Ground
      G03889694Courtesy of FORD MOTOR CO.
    • Is B+ present? 
    • Yes  : GO to  A12.
    • No  : GO to A9.
  9. A9 TEST FUSE F2.6 (10A) 
    • Key in OFF position.
    • Check fuse: Fuse F2.6 (10A).
    • Is the resistance 5 ohms or less? 
    • Yes  : GO to  A11.
    • No  : GO to A10.
  10. A10 TEST CIRCUIT 298 (BK/OG) FOR SHORT TO GROUND 
    • Measure the resistance at pin C2008-1, circuit 298 (BK/OG).
      Fig 7: Measuring Resistance At Circuit 298 To Ground
      G03889695Courtesy of FORD MOTOR CO.
    • Is the resistance 10,000 ohms or less? 
    • Yes  : REPAIR circuit 298 (BK/OG) for short to ground. TEST the system for normal operation.
    • No  : GO to A11.
  11. A11 TEST CIRCUIT 298 (BK/OG) FOR OPEN 
    • Measure the resistance of circuit 298 (BK/OG) between output side of fuse 6 (10A) and shift lock actuator pin C2008-1.
      Fig 8: Measuring Resistance Between Output Side Of Fuse 6 And Shift Lock Actuator For Open Circuit
      G03889696Courtesy of FORD MOTOR CO.
    • Is the resistance 5 ohms or less? 
    • Yes  : GO to A12.
    • No  : REPAIR circuit 298 (BK/OG) for open. TEST system for normal operation.
  12. A12 TEST CIRCUIT 57 (BK) FOR OPEN 
    • Measure the resistance of shift lock actuator C2008-2, circuit 57 (BK).
      Fig 9: Measuring Resistance Of Shift Lock Actuator For Open Circuit
      G03889697Courtesy of FORD MOTOR CO.
    • Is the resistance 5 ohms or less? 
    • Yes  : INSTALL a new shift lock actuator. TEST the system for normal operation.
    • No  : REPAIR circuit 57 (BK) for open. TEST the system for normal operation.
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