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Pinpoint Test D: Transmission Control Indicator Lamp (TCIL) Does Not Illuminate

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
  1. D1 CHECK THE TRANSMISSION CONTROL INDICATOR LAMP (TCIL) CIRCUIT 915 FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Powertrain Control Module (PCM).
    • Key in ON position.
    • Measure the voltage at pin 4 and ground
    • Is the voltage reading greater than 10 volts? 
    • Yes  : INSTALL a new PCM. CYCLE the transmission control switch (TCS) to check the operation of the TCIL. TEST the system for normal operation.
    • No  : CHECK the indicator bulb and the fuse. If OK, GO to D2.
  2. D2 CHECK THE TRANSMISSION CONTROL INDICATOR LAMP (TCIL) CIRCUIT 729 FOR VOLTAGE 
    • Disconnect the instrument cluster.
    • Key in ON position.
    • Measure the voltage at pin 17 and ground
    • Is the voltage greater than 10 volts 
    • Yes  : INSTALL a new PCM. CYCLE the transmission control switch (TCS) to check the operation of the TCIL. TEST the system for normal operation.
    • No  : REPAIR circuit. TEST the system for normal operation.
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