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Pinpoint Test C: Unusual Starter Noise: Notes

WARNING: This page is about a different car, the 2008 Ford RV Cutaway, 2008 Ford Econoline, 2008 Ford E450 Super Duty, and 2008 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

Refer to SYSTEM WIRING DIAGRAMS - E350 SUPER DUTY for schematic and connector information.

In normal operation, voltage from power distribution box (PDB) fuse 7 (60A) is supplied to the ignition switch through circuit 1050 (LG/VT). When the ignition switch is placed in the START position, voltage is supplied through circuit 0033 (WH/PK) to instrument panel fuse 33 (10A). Power is then supplied from the instrument panel fuse panel to the starter relay through circuit 1093 (TN/RD). The starter relay is supplied ground from the PCM through circuit 1419 (LG/YE). Power is supplied at all times to the starter motor from the battery, circuit 2037 (RD). The starter relay has voltage supplied at all times from PDB fuse 18 (60A), circuit 1523 (DG). When the starter relay is energized, voltage supplied to the starter relay is sent to the starter motor solenoid through circuit 0113 (YE/LB). The starter motor is disengaged when the key is released from the START position.

This pinpoint test is intended to diagnose the following:

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