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

A1 TEST THE BRAKE LIGHTS
- Apply the brake pedal and view the brake lights.
  
  Fig 1: Applying Brake Pedal
  Courtesy of FORD MOTOR CO.
- Do the brake lights illuminate?
- Yes : GO to A7.
- No : GO to A2.
A2 TEST FUSE 14 (15A)
- Check fuse: Fuse 14 (15A).
- Is the resistance of the fuse 5 ohms or less?
- Yes : GO to A4.
- No : GO to A3.
A3 TEST CIRCUIT 10 (LG/RD) FOR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: Brake Pedal Position (BPP) Switch C278.
- Measure the resistance between C278 pin 1, circuit 10 (LG/RD), harness side and ground.
  
  Fig 2: Testing Circuit 10 (LG/RD) For Short To Ground
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 10,000 ohms?
- Yes : REPAIR circuit 10 (LG/RD). TEST the system for normal operation.
- No : GO to A4.
A4 TEST CIRCUIT 10 (LG/RD) FOR AN OPEN
- Measure the resistance between Fuse 14 (15A), output side and C278 pin 1, circuit 10 (LG/RD), harness side.
  
  Fig 3: Testing Circuit 10 (LG/RD) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to A5.
- No : REPAIR circuit 10 (LG/RD). TEST the system for normal operation.
A5 TEST THE BRAKE PEDAL POSITION (BPP) SWITCH
- Measure the resistance between BPP switch pin 1 and pin 2, while open (off) and closed (on).
  
  Fig 4: Testing Brake Pedal Position Switch
  Courtesy 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 BPP switch. TEST the system for normal operation.
A6 TEST CIRCUIT 810 (RD/LG) FOR A SHORT TO GROUND
- Disconnect: Shift Lock Actuator C2008.
- Measure the resistance between C2008 pin 1, circuit 810 (RD/LG), harness side and ground.
  
  Fig 5: Testing Circuit 810 (RD/LG) For Short To Ground
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 10,000 ohms?
- Yes : REPAIR circuit 810 (RD/LG). TEST the system for normal operation.
- No : GO to A7.
A7 TEST CIRCUIT 810 (RD/LG) FOR AN OPEN
- Measure the resistance between C2008 pin 1, circuit 810 (RD/LG) harness side and C278 pin 1, circuit 810 (RD/LG) harness side.
  
  Fig 6: Testing Circuit 810 (RD/LG) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to A8.
- No : REPAIR circuit 810. TEST the system for normal operation.
A8 TEST FOR B+ ON CIRCUIT 1087C (OG)
- Key in ON position.
- Measure the voltage between C2008 pin 3, circuit 1087C (OG) harness side and ground.
  
  Fig 7: Testing For B+ ON Circuit 1087C (OG)
  Courtesy of FORD MOTOR CO.
- Is there battery voltage?
- Yes : GO to A12.
- No : GO to A9.
A9 TEST FUSE 57 (10A)
- Key in OFF position.
- Check fuse: Fuse 57 (10A).
- Is the resistance less than 5 ohms?
- Yes : GO to A11.
- No : GO to A10.
A10 TEST CIRCUIT 1087C (OG) FOR A SHORT TO GROUND
- Measure the resistance between C2008 pin 3, circuit 1087C (OG) harness side and ground.
  
  Fig 8: Testing Circuit 1087C (OG) For Short To Ground
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 10,000 ohms?
- Yes : REPAIR circuit 1087C (OG). TEST the system for normal operation.
- No : GO to A11.
A11 TEST CIRCUIT 1087C (OG) FOR AN OPEN
- Measure the resistance between Fuse 57 (10A), output side and C2008 pin 3, circuit 1087C (OG) harness side.
  
  Fig 9: Testing Circuit 1087C (OG) For An Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : GO to A12.
- No : REPAIR circuit 1087C (OG) for an open. TEST the system for normal operation.
A12 TEST CIRCUIT 57E (BK) FOR AN OPEN
- Measure the resistance between C2008 pin 2, circuit 57E (BK) harness side and ground.
  
  Fig 10: Testing Circuit 57E (BK) For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : INSTALL a new shift lock actuator. TEST the system for normal operation.
- No : REPAIR circuit 57E (BK). TEST the system for normal operation.