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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 761 (Automatic Transmission External Controls - F150 & Mark LT) >> Diagnostic Tests >> External Controls >> Pinpoint Tests >> Pinpoint Test C: The Shift Interlock System Does Not Release/Lock Correctly

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

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. C1 TEST FUSE F16 (10A) 
    • Key in OFF position.
    • Check fuse: Fuse F16 (10A)
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  C3.
    2. NO  : INSTALL the fuse. TEST the system for normal operation. If the fuse fails again, go to  C2 .
  2. C2 TEST SHIFT INTERLOCK CIRCUIT FOR SHORT TO GROUND 
    • Measure the resistance between the brake pedal position (BPP) switch connector pin 5 and ground.
      • Fig 1: Testing Shift Interlock Circuit For Short To Ground
      GF0003763Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : REPAIR circuit. RECONNECT all components. TEST the system for normal operation.
    2. NO  : Go to  C3.
  3. C3 TEST SHIFT INTERLOCK CIRCUIT FOR OPEN 
    • Measure the resistance between the output side of fuse F16 (10A) and BPP switch connector pin 5.
      • Fig 2: Testing Shift Interlock Circuit For Open
      GF0003764Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  C4.
    2. NO  : REPAIR circuit. RECONNECT all components. TEST the system for normal operation.
  4. C4 TEST BRAKE PEDAL POSITION (BPP) SWITCH 
    • Measure the resistance between the BPP switch, pin 5 and pin 6 while open (OFF) and closed (ON).
      • Fig 3: Testing Brake Pedal Position (BPP) Switch
      GF0003765Courtesy of FORD MOTOR CO.
    • Is the resistance of the switch greater than 10,000 ohms while OFF and less than 5 ohms while ON? 
    1. YES  : Go to  C5.
    2. NO  : INSTALL a new BPP switch. TEST the system for normal operation.
  5. C5 TEST SHIFT INTERLOCK SOLENOID CIRCUIT FOR SHORT TO GROUND 
    • Disconnect: Brake Pedal Position (BPP) Switch
    • For vehicles equipped with a column shifter, measure the resistance between shift interlock solenoid connector pin 2 and ground.
      • Fig 4: Testing Shift Interlock Solenoid Circuit For Short To Ground (1 Of 2)
      GF0003766Courtesy of FORD MOTOR CO.
    • For vehicles equipped with a floor shifter, measure the resistance between the shift control electrical connector pin 1 and ground.
      • Fig 5: Testing Shift Interlock Solenoid Circuit For Short To Ground (2 Of 2)
      GF0003767Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : REPAIR circuit. RECONNECT all components. TEST the system for normal operation.
    2. NO  : Go to  C6.
  6. C6 TEST SHIFT INTERLOCK ACTUATOR CIRCUIT FOR OPEN 
    • For vehicles equipped with a column shifter, measure the resistance between the shift interlock actuator connector pin 2 and the BPP switch connector pin 6.
      • Fig 6: Testing Shift Interlock Actuator Circuit For Open (1 Of 2)
      GF0003768Courtesy of FORD MOTOR CO.
    • For vehicles equipped with a floor shifter, measure the resistance between the shift control electrical connector pin 1 and the BPP switch connector pin 6.
      • Fig 7: Testing Shift Interlock Actuator Circuit For Open (2 Of 2)
      GF0003769Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : If equipped with a column shifter, go to  C10 . If equipped with a floor shifter, go to  C7 .
    2. NO  : REPAIR circuit. RECONNECT all components. TEST the system for normal operation.
  7. C7 TEST FUSE F15 (5A) 
    • Key in OFF position.
    • Check fuse: F15 (5A)
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  C8.
    2. NO  : INSTALL the fuse and TEST the system for normal operations. If the fuse fails again, go to  C8 .
  8. C8 TEST FLOOR SHIFTER CIRCUIT FOR SHORT TO GROUND 
    • Measure the resistance between the shift control electrical connector pin 2 and ground.
      • Fig 8: Testing Floor Shifter Circuit For Short To Ground
      GF0003770Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : REPAIR circuit. RECONNECT all components. TEST the system for normal operation.
    2. NO  : Go to  C9.
  9. C9 TEST FLOOR SHIFTER CIRCUIT FOR OPEN 
    • Measure the resistance between the output side of fuse F15 (5A) and shift control electrical connector pin 2.
      • Fig 9: Testing Floor Shifter Circuit For Open
      GF0003771Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  C10.
    2. NO  : REPAIR circuit. RECONNECT all components. TEST the system for normal operation.
  10. C10 TEST SHIFT INTERLOCK ACTUATOR GROUND CIRCUIT FOR OPEN 
    • If equipped with a column shifter, measure the resistance between shift interlock actuator connector pin 4 and ground.
      • Fig 10: Testing Shift Interlock Actuator Ground Circuit For Open (1 Of 2)
      GF0003772Courtesy of FORD MOTOR CO.
    • If equipped with a floor shifter, measure the resistance between shift control electrical connector pin 6 and ground.
    • Is the resistance 5 ohms or less? 
      • Fig 11: Testing Shift Interlock Actuator Ground Circuit For Open (2 Of 2)
      GF0003773Courtesy of FORD MOTOR CO.
    1. YES  : INSTALL a new shift lock actuator. TEST the system for normal operation.
    2. NO  : REPAIR circuit. RECONNECT all components. TEST the system for normal operation.
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