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Home >> Mercury >> 2008 >> Milan Base, 2.3 Z, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1419 (Automatic Transmission External Controls) >> Diagnostic Tests >> External Controls >> Pinpoint Tests >> Pinpoint Test A: The Brake Shift Interlock System Does Not Release/Lock Correctly

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

WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
  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 article.
  2. A2 TEST Brake Shift Interlock Actuator (BSIA) POWER CIRCUIT 
    • Disconnect: Selector Lever Electrical C3245 (2.3L/3.0L engine) or C3233 (3.5L engine)
    • Key in ON position.
      • Fig 1: Testing Shift Interlock Actuator Power Circuit - 3.0L or a 2.3L
      GF0029865Courtesy of FORD MOTOR CO.
    • Vehicles equipped with a 3.0L or a 2.3L engine, measure the voltage between selector lever harness C3245-1, circuit VET13 (GY/BU), vehicle harness side and ground, while applying the brake pedal.
      • Fig 2: Measuring Voltage
      GF0029866Courtesy of FORD MOTOR CO.
    • Vehicles equipped with a 3.5L engine, measure the voltage between selector lever harness C3233-1, circuit VET13 (GY/BU), vehicle harness side and ground, while applying the brake pedal.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  A5.
    2. NO  : Go to  A3.
  3. A3 TEST THE BSIA POWER CIRCUIT FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Smart Junction Box (SJB) C2280C
      • Fig 3: Testing BSIA Power Circuit For A Short To Ground
      GF0041471Courtesy of FORD MOTOR CO.
    • Vehicles equipped with a 3.0L or a 2.3L engine, measure the resistance between the selector lever harness C3245-1, circuit VET13 (GY/BU), vehicle harness side and ground.
      • Fig 4: Measuring Resistance Between Selector Lever Harness C3245-1, Circuit CET53 (BU/OG) & Ground
      GF0031984Courtesy of FORD MOTOR CO.
    • Vehicles equipped with a 3.5L engine, measure the resistance between selector lever harness C3233-1, circuit VET13 (GY/BU), vehicle harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  A4.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. A4 TEST THE BSIA POWER CIRCUIT FOR AN OPEN 
    • Key in OFF position.
      • Fig 5: Testing BSIA Power Circuit For An Open
      GF0041472Courtesy of FORD MOTOR CO.
    • Vehicles equipped with a 3.0L or a 2.3L engine, measure the resistance between the selector lever harness C3245-1, circuit VET13 (GY/BU), vehicle harness side and SJB C2280C-14, circuit VET13 (GY/BU), vehicle harness side.
      • Fig 6: Measuring Resistance Between Selector Lever Harness C3245-1, Circuit VET13 (GY/BU)
      GF0041473Courtesy of FORD MOTOR CO.
    • Vehicles equipped with a 3.5L engine, measure the resistance between the selector lever harness C3233-1, circuit VET13 (GY/BU), vehicle harness side and SJB C2280C-14, circuit VET13 (GY/BU), vehicle harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new SJB. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  5. A5 TEST THE BSIA GROUND CIRCUIT 
    • Key in OFF position.
      • Fig 7: Testing Shift Interlock Actuator Ground Circuit - 3.0L or a 2.3L
      GF0029867Courtesy of FORD MOTOR CO.
    • Vehicles equipped with a 3.0L or a 2.3L engine, measure the resistance between the selector lever harness C3245-4, circuit GD116 (BK/VT), vehicle harness side and ground.
      • Fig 8: Measuring Resistance
      GF0029868Courtesy of FORD MOTOR CO.
    • Vehicles equipped with a 3.5L engine, measure the resistance between selector lever harness C3233-5, circuit GD116 (BK/VT), vehicle harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new selector lever. REFER to Selector Lever .
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
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