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Home >> Ford >> 2002 >> Cutaway 7.3 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 2451 (Transfer Case - Four Wheel Drive (4WD) Systems -- F250-F550 Super Duty) >> Diagnostic Tests >> Four Wheel Drive (4WD) Systems - Electronic Shift >> Pinpoint Tests >> Pinpoint Test P: Transmission Four Wheel Drive (4X4) Mode Select Switch Failure >> 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.

The mode select switch (MSS) communicates the operator's choice to the 4X4 control module. The 4X4 control module controls the shift solenoid, transfer case motor and pulse vacuum hub locks (PVHs) as necessary. If the vehicle is not responding to the operator's intentions, systematically check the necessary inputs and outputs of the MSS and the 4X4 control module. Check all circuits for opens and shorts to power or ground.

This pinpoint test is intended to diagnose the following:

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