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Home >> Ford >> 2005 >> Escape Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 861 (Transfer Case - Four Wheel Drive (4WD) Systems -- F250-F550 Super Duty) >> Diagnostic Tests >> Four Wheel Drive (4WD) Systems - Electronic Shift >> Pinpoint Tests >> Pinpoint Test K: 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 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 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 782 (BR/WH) provides the 4X4 control module-switched ground path for the clockwise rotation relay. While the low to high (clockwise) relay is energized, circuit 777 (YE) sends battery voltage from the battery junction box (BJB) fuse 3 (30A) and circuit 704 (DG/LG). Circuit 778 (OG) provides ground for the transfer case shift motor to operate in the clockwise direction. When the high to low shift occurs, circuit 781 (OG/LB) provides the 4X4 control module-switched ground path for the counterclockwise rotation relay. While the high to low counterclockwise relay is energized, circuit 778 (OG) sends battery voltage from the battery junction box (BJB) fuse 3 (30A) and circuit 704 (DG/LG). Circuit 777 (YE) provides ground for the transfer case shift motor to operate in the counterclockwise direction.

Possible Causes

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