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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 2008 Ford RV Cutaway, 2008 Ford Econoline, 2008 Ford E450 Super Duty, and 2008 Ford Cutaway. 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? 
    1. YES  : Go to  A7.
    2. NO  : Go to  A2.
  2. A2 TEST FUSE 2.11 (15A) 
    • Key in OFF position.
    • Check fuse: Central Junction Box (CJB) Fuse 2.11 (15A)
    • Is the resistance 5 ohms or less? 
    1. YES  : Go to  A4.
    2. NO  : Go to  A3.
  3. A3 TEST CIRCUIT 10 (LG/RD) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Brake Pedal Position (BPP) Switch C278-2
      • Fig 1: Checking Circuit 10 (LG/RD) For A Short To Ground
      GF0012475Courtesy of FORD MOTOR CO.
    • Measure the resistance of circuit 10 (LG/RD) at BPP switch C278.
    • Is the resistance 10,000 ohms or less? 
    1. YES  : REPAIR circuit 10 (LG/RD) for a short to ground. TEST the system for normal operation.
    2. NO  : Go to  A4.
  4. A4 TEST CIRCUIT 10 (LG/RD) FOR AN OPEN 
      Fig 2: Checking Circuit 10 (LG/RD) For An Open
      GF0012476Courtesy of FORD MOTOR CO.
    • Measure the resistance between the output side of fuse 2.11 (15A) and BPP switch C278-2, circuit 10 (LG/RD).
    • Is the resistance 5 ohms or less? 
    1. YES  : Go to  A5.
    2. NO  : REPAIR circuit 10 (LG/RD) for an open. TEST the system for normal operation.
  5. A5 TEST THE BPP SWITCH 
      Fig 3: Checking BPP Switch
      GF0012477Courtesy of FORD MOTOR CO.
    • Measure the resistance of BPP switch C278 while open (OFF) and closed (ON).
    • Is the resistance of the switch greater than 10,000 ohms while OFF and 5 ohms or less while ON? 
    1. YES  : Go to  A6.
    2. NO  : INSTALL a new BPP switch. TEST the system for normal operation.
  6. A6 TEST CIRCUIT 569 (DG) FOR A SHORT TO GROUND 
    • Disconnect: BSIA C2008
      • Fig 4: Checking Circuit 569 (DG) For A Short To Ground
      GF0012478Courtesy of FORD MOTOR CO.
    • Measure the resistance of circuit 569 (DG), pin C2008-3.
    • Is the resistance 10,000 ohms or less? 
    1. YES  : REPAIR circuit 569 (DG) for a short to ground. TEST the system for normal operation.
    2. NO  : Go to  A7.
  7. A7 TEST CIRCUIT 569 (DG) FOR AN OPEN 
      Fig 5: Checking Circuit 569 (DG) For An Open
      GF0012479Courtesy of FORD MOTOR CO.
    • Measure the resistance of circuit 569 (DG) between brake shift interlock actuator (BSIA) C2008-3 and BPP switch C278.
    • Is the resistance 5 ohms or less? 
    1. YES  : Go to  A8.
    2. NO  : REPAIR circuit 569 (DG) for an open. TEST the system for normal operation.
  8. A8 TEST FOR B+ ON CIRCUIT 294 (WH/LB) 
    • Key in ON position.
      • Fig 6: Testing For B+ On Circuit 294 (WH/LB)
      GF0007065Courtesy of FORD MOTOR CO.
    • Measure the voltage at BSIA C2008-1, circuit 294 (WH/LB).
    • Is B+ present? 
    1. YES  : Go to  A12.
    2. NO  : Go to  A9.
  9. A9 TEST FUSE 2.6 (10A) 
    • Key in OFF position.
    • Check fuse: Fuse 2.6 (10A)
    • Is the resistance 5 ohms or less? 
    1. YES  : Go to  A11.
    2. NO  : Go to  A10.
  10. A10 TEST CIRCUIT 294 (WH/LB) FOR A SHORT TO GROUND 
      Fig 7: Checking Circuit 294 (WH/LB) For A Short To Ground
      GF0012480Courtesy of FORD MOTOR CO.
    • Measure the resistance at BSIA C2008-1, circuit 294 (WH/LB).
    • Is the resistance 10,000 ohms or less? 
    1. YES  : REPAIR circuit 294 (WH/LB) for a short to ground. TEST the system for normal operation.
    2. NO  : Go to  A11.
  11. A11 TEST CIRCUIT 294 (WH/LB) FOR AN OPEN 
      Fig 8: Checking Circuit 294 (WH/LB) For An Open
      GF0012481Courtesy of FORD MOTOR CO.
    • Measure the resistance of circuit 294 (WH/LB) between the output side of fuse 2.6 (10A) and BSIA C2008-1.
    • Is the resistance 5 ohms or less? 
    1. YES  : Go to  A12.
    2. NO  : REPAIR circuit 294 (WH/LB) for an open. TEST system for normal operation.
  12. A12 TEST CIRCUIT 57 (BK) FOR AN OPEN 
      Fig 9: Testing Circuit 57 (BK) For An Open
      GF0007068Courtesy of FORD MOTOR CO.
    • Measure the resistance of BSIA C2008-2, circuit 57 (BK).
    • Is the resistance 5 ohms or less? 
    1. YES  : INSTALL a new BSIA. TEST the system for normal operation.
    2. NO  : REPAIR circuit 57 (BK) for an open. TEST the system for normal operation.
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