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

  1. A1 TEST THE BRAKE LIGHTS 
    • Apply the brake pedal and view the brake lights.
    • Do the brake lights illuminate? 
    1. YES  : Go to  A2.
    2. NO  : REFER to EXTERIOR LIGHTING .
  2. A2 TEST SMART JUNCTION BOX (SJB) FUSE 5 (10A) 
    • Key in OFF position.
    • Check fuse: 5 (10A)
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  A3.
    2. NO  : INSTALL a new fuse. Go to  A3.
  3. A3 TEST SHIFT INTERLOCK ACTUATOR POWER CIRCUIT 
    • Disconnect: Selector Lever Harness Connector C3245
    • Key in ON position.
      • Fig 1: Measuring Voltage Between Selector Lever Harness Connector C3245-1, Circuit CET53 (BU/OG) & Ground
      GF0029866Courtesy of FORD MOTOR CO.
    • Measure the voltage between selector lever harness connector C3245-1, circuit CET53 (BU/OG) and ground, while applying the brake pedal.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  A6.
    2. NO  : Go to  A4.
  4. A4 TEST THE SHIFT INTERLOCK ACTUATOR POWER CIRCUIT FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: SJB C2280C
      • Fig 2: Measuring Resistance Between Selector Lever Harness C3245-1, Circuit CET53 (BU/OG) & Ground
      GF0031984Courtesy of FORD MOTOR CO.
    • Measure the resistance between selector lever harness C3245-1, circuit CET53 (BU/OG) and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  A5.
    2. NO  : REPAIR circuit CET53 (BU/OG) for a short to ground. TEST the system for normal operation.
  5. A5 TEST THE SHIFT INTERLOCK ACTUATOR POWER CIRCUIT FOR AN OPEN 
      Fig 3: Measuring Resistance Between Selector Lever Harness C3245-1, CET53 (BU/OG) & SJB C2280C-23
      GF0031985Courtesy of FORD MOTOR CO.
    • Measure the resistance between selector lever harness C3245-1, circuit CET53 (BU/OG) and SJB C2280C-23, circuit CET53 (BU/OG).
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new SJB. TEST the system for normal operation.
    2. NO  : REPAIR circuit CET53 (BU/OG) for an open.
  6. A6 TEST SHIFT INTERLOCK ACTUATOR GROUND CIRCUIT 
    • Key in OFF position.
      • Fig 4: Measuring Resistance Between Floor Selector Lever Harness Connector C3245-4, GD112 (BK/GN) & Ground
      GF0031986Courtesy of FORD MOTOR CO.
    • Measure the resistance between floor selector lever harness connector C3245-4, circuit GD112 (BK/GN) and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new selector lever. REFER to Selector Lever .
    2. NO  : REPAIR circuit GD112 (BK/GN). TEST the system for normal operation.
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