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Home >> Mercury >> 2009 >> Sable Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1497 (Starting System) >> Diagnosis And Testing >> Starting System >> Pinpoint Tests >> Pinpoint Test A: The Engine Does Not Crank >> Normal Operation
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Normal Operation

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

Under normal operation, constant power is supplied to the starter relay on circuit SBB05 (GY/RD), the starter on circuit SBB02 (RD) and to the ignition switch on circuit SBP27 (BU/RD). When the key is placed in the START position, with the vehicle in PARK or NEUTRAL or with the clutch pedal depressed, power flows to the starter motor relay through CE336 (GN/WH). Inputs from the Transmission Range (TR) sensor and clutch cutoff switch to the PCM provide a ground to the starter relay on circuit CDC12 (YE). When the coil of the relay is energized, it sends power to the starter motor on circuit CDC25 (BN/GN).

This pinpoint test is intended to diagnose the following: 

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