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Home >> Ford >> 2003 >> Cutaway 7.3 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 2125 (Transfer Case - Four Wheel Drive (4WD) Systems -- F250-F550 Super Duty) >> Diagnostic Tests >> Four Wheel Drive (4WD) Systems - Electronic Shift >> Pinpoint Tests >> Pinpoint Test J: Low to High (Clockwise)/High to Low (Counterclockwise) Relay Circuitry Functional Test >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2008 Ford Pickup, 2008 Ford F550 Super Duty, 2008 Ford F450 Super Duty, and 2008 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

When the low to high shift occurs, circuit CCF28 (VT/GY) provides the 4X4 control module-switched ground path for the clockwise rotation relay. While the low to high (clockwise) relay coil is energized, circuit CCF07 (BN/GN) sends battery voltage from the battery junction box (BJB) fuse 26 (30A) and circuit SBB26 (YE/RD). Circuit CCF08 (GY/OG) provides ground for the transfer case shift motor to operate in the clockwise direction. When the high to low shift occurs, circuit CCF27 (GY) provides the 4X4 control module-switched ground path for the counterclockwise rotation relay. While the high to low counterclockwise relay coil is energized, circuit CCF08 (GY/OG) sends battery voltage from the BJB fuse 48 (30A) and circuit SBB48 (VT/RD). Circuit CCG07 (BN/GN) provides ground for the transfer case shift motor to operate in the counterclockwise direction.

This pinpoint test is intended to diagnose the following:

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