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Normal Operation

WARNING: This page is about a different car, the 2014 Lincoln MKX and 2014 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

When the ignition switch - push button start is pressed in combination with the brake pedal, the Remote Function Actuator (RFA) module, Body Control Module (BCM) and PCM  receive signals requesting to crank and start the engine. The PCM  and Remote Function Actuator (RFA) module receive notification from the Transmission Range (TR) sensor that the gear selector is in PARK or NEUTRAL. The PCM  requires a voltage signal from the RUN/START relay to operate. The PCM  then supplies voltage and ground to the starter relay coil. The energized coil causes the starter relay contacts to close which allows voltage to be supplied from Battery Junction Box (BJB) fuse 19 to the starter solenoid coil. The starter solenoid coil is grounded at the starter motor. Energizing the starter solenoid closes the solenoid contacts allowing voltage directly from the battery to the starter motor, engaging the starter drive into the ring gear causing the engine to crank. The PCM  disengages the starter motor once an engine Revolutions Per Minute (RPM) threshold is reached, a set crank time is exceeded or the ignition switch - push button start is pressed indicating an engine shutdown request.

This pinpoint test is intended to diagnose the following: 

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