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Normal Operation

WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.

In normal operation, voltage from the Bussed Electrical Center (BEC) is supplied to the ignition switch through circuit 1050 (LG/PK). When the ignition switch is placed in the START position, voltage is supplied through circuit 1522 (DG) to the Smart Junction Box (SJB).

For automatic transmission equipped vehicles, voltage is supplied from the SJB on circuit 32 (RD/LB) to the BEC, from the BEC power is supplied to the Transmission Range (TR) sensor through circuit 33 (WH/PK). In PARK or NEUTRAL, voltage is supplied from the TR sensor through circuit 33 (WH/PK) to the starter relay coil located in the BEC. The starter relay coil is supplied ground from the PCM through circuit 1419 (LG/YE).

For manual transmission equipped vehicles, when the clutch pedal is depressed, the Clutch Pedal Position (CPP) supplies a ground to the PCM through circuit 92 (LB/YE). The starter relay coil is supplied ground from the PCM through circuit 1419 (LG/YE). Voltage is supplied to the starter relay coil located in the BEC through circuit 33 (WH/PK).

When the starter relay is energized, voltage supplied to the relay switch is sent to the starter motor solenoid through circuit 113 (YE/LB). Battery voltage is supplied to the starter motor through circuit 2037 (RD) at all times.

This pinpoint test is intended to diagnose the following:

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