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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 67 (Automatic Transmission External Controls -- F250-F550 Super Duty) >> Diagnosis And Testing >> External Controls >> Pinpoint Tests >> Pinpoint Test A: The Shift Interlock System Does Not Release/Lock Correctly

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

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. A1 TEST BRAKE LIGHTS 
    • Apply the brake pedal and view the brake lights.
    • Do the brake lights illuminate? 
    • Yes  : GO to  A7.
    • No  : GO to A2.
  2. A2 TEST FUSE F2.34 (10A) 
    • Key in OFF position.
    • Check fuse: Fuse F2.34 (10A).
    • Is the resistance 5 ohms or less? 
    • Yes  : GO to  A4.
    • No  : GO to A3.
  3. A3 TEST CIRCUIT 22 (LB/BK) FOR SHORT TO GROUND 
    • Measure the resistance of circuit 22 (LB/BK) at C278 pin 3.
      Fig 1: Measuring Resistance Of Circuit 22 (LB/BK) At C278 Pin 3
      G03964421Courtesy of FORD MOTOR CO.
    • Is the resistance 10,000 ohms or less? 
    • Yes  : SERVICE circuit 22 (LB/BK) for short to ground. TEST the system for normal operation.
    • No  : GO to A4.
  4. A4 TEST CIRCUIT 22 (LB/BK) FOR OPEN 
    • Measure the resistance between the output side of fuse F2.34 (10A) and brake pedal position switch C278 pin 3, circuit 22 (LB/BK).
      Fig 2: Measuring Resistance Between Output Side Of Fuse F2.34 (10A) And Brake Pedal Position Switch C278 Pin 3, Circuit 22 (LB/BK)
      G03909485Courtesy of FORD MOTOR CO.
    • Is the resistance 5 ohms or less? 
    • Yes  : GO to A5.
    • No  : SERVICE circuit 22 (LB/BK) for open. TEST the system for normal operation.
  5. A5 TEST BRAKE PEDAL POSITION SWITCH 
    • Measure the resistance of the brake pedal position switch while open (OFF) and closed (ON).
      Fig 3: Measuring Resistance Of Brake Pedal Position Switch
      G03909486Courtesy of FORD MOTOR CO.
    • Is the resistance of 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 810 (RD/LG) FOR SHORT TO GROUND 
    • Disconnect: Brake Pedal Position Switch C278.
    • Measure the resistance of circuit 810 (RD/LG), C2008 pin 3.
      Fig 4: Measuring Resistance Of Circuit 810 (RD/LG), C2008 Pin 3
      G03889692Courtesy of FORD MOTOR CO.
    • Is the resistance 10,000 ohms or less? 
    • Yes  : SERVICE circuit 810 (RD/LG) for short to ground. TEST the system for normal operation.
    • No  : GO to A7.
  7. A7 TEST CIRCUIT 810 (RD/LG) FOR OPEN 
    • Measure the resistance of circuit 810 (RD/LG) between shift lock actuator C2008 pin 3 and brake pedal position switch C278 pin 2.
      Fig 5: Measuring Resistance Of Circuit 810 (RD/LG) Between Shift Lock Actuator C2008 Pin 3 And Brake Pedal Position Switch C278 Pin 2
      G03923244Courtesy of FORD MOTOR CO.
    • Is the resistance 5 ohms or less? 
    • Yes  : GO to A8.
    • No  : SERVICE circuit 810 (RD/LG) for open. TEST the system for normal operation.
  8. A8 TEST FOR B+ ON CIRCUIT 295 (LG/PK) 
    • Key in ON position.
    • Measure the voltage at shift lock actuator C2008 pin 1, circuit 295 (LG/PK).
      Fig 6: Measuring Voltage At Shift Lock Actuator C2008 Pin 1, Circuit 295 (LG/PK)
      G03889694Courtesy of FORD MOTOR CO.
    • Is B+ present? 
    • Yes  : GO to  A12.
    • No  : GO to A9.
  9. A9 TEST FUSE F2.27 (15A) 
    • Key in OFF position.
    • Check fuse: Fuse F2.27 (15A).
    • Is the resistance of fuse 5 ohms or less? 
    • Yes  : GO to  A11.
    • No  : GO to A10.
  10. A10 TEST CIRCUIT 295 (LB/PK) FOR SHORT TO GROUND 
    • Measure the resistance at C2008 pin 1, circuit 295 (LB/PK).
      Fig 7: Measuring Resistance At C2008 Pin 1, Circuit 295 (LB/PK)
      G03889695Courtesy of FORD MOTOR CO.
    • Is the resistance 10,000 ohms or less? 
    • Yes  : SERVICE circuit 295 (LB/PK) for short to ground. TEST the system for normal operation.
    • No  : GO to A11.
  11. A11 TEST CIRCUIT 295 (LB/PK) FOR OPEN 
    • Measure the resistance of circuit 295 (LB/PK) between the output side of fuse F2.27 (15A) and shift lock actuator C2008 pin 1.
      Fig 8: Measuring Resistance Of Circuit 295 (LB/PK) Between Output Side Of Fuse F2.27 (15A) And Shift Lock Actuator C2008 Pin 1
      G03923247Courtesy of FORD MOTOR CO.
    • Is the resistance 5 ohms or less? 
    • Yes  : GO to A12.
    • No  : SERVICE circuit 295 (LB/PK) for open. TEST the system for normal operation.
  12. A12 TEST CIRCUIT 57 (BK) FOR OPEN 
    • Measure the resistance of shift lock actuator C2008 pin 2, circuit 57 (BK).
      Fig 9: Measuring Resistance Of Shift Lock Actuator C2008 Pin 2, Circuit 57 (BK)
      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  : SERVICE circuit 57 (BK) for open. TEST the system for normal operation.
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