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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.

The BCM  and PCM  receive a request to crank the engine when the ignition switch is turned to the START position. When the PCM  receives the correct inputs from the BCM  , voltage from the RUN/START relay, and notification from the TR sensor that the gear selector is in PARK or NEUTRAL, the PCM  then supplies voltage and ground to the starter relay coil. The energized coil causes the starter relay contacts to close. This allows voltage to be supplied from the BJB  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 has been turned to the OFF position.

This pinpoint test is intended to diagnose the following: 

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