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Pinpoint Test C: The Transmission Control Switch Is Inoperative

  1. C1 CHECK THE CIRCUIT FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Brake Shift Interlock Module
    • Key in ON position.
      • Fig 1: Checking Circuit For Voltage
      GF0025262Courtesy of FORD MOTOR CO.
    • Measure the voltage between brake shift interlock module pin 4, harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  C2.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  2. C2 CHECK THE TRANSMISSION CONTROL SWITCH 
      Fig 2: Checking Transmission Control Switch
      GF0025263Courtesy of FORD MOTOR CO.
    • While cycling the transmission control switch, measure the resistance between brake shift interlock module pin 4 and pin 1, component side.
    • Does the resistance change from greater than 10,000 ohms to less than 5 ohms? 
    1. YES  : Go to  C3.
    2. NO  : INSTALL a new brake shift interlock module. TEST the system for normal operation.
  3. C3 CHECK THE CIRCUIT FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Powertrain Control Module (PCM)
    • Measure the resistance between brake shift interlock module pin 1 and the PCM connector pin C29.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  C4.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. C4 CHECK THE CIRCUIT FOR A SHORT TO GROUND 
    • Measure the resistance between PCM connector pin C29 and chassis ground.
    • Is the resistance greater than 10,000 ohms. 
    1. YES  : Go to  C5.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  5. C5 CHECK THE CIRCUIT FOR A SHORT TO VOLTAGE 
    • Measure the voltage between PCM connector pin C29 and chassis ground.
    • Is voltage present? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : REFER to the INTRODUCTION - GASOLINE ENGINES article.
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