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Pincipales Problemas De Los Vehiculos Ford 4x4

Ensayos de Calidad: Pincipales Problemas De Los Vehiculos Ford 4x4
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Enviado por:  elbros  08 mayo 2013
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the Electric Shift 4 X 4

The Ford "Touch Drive" shift-on-the-fly system is currently available on Ranger, Bronco, F-Series and Explorer. Following are the six common concerns most often expressed by customers:

1. Nothing happens (dead system).

2. No range shift.

3. Attempt to shift into 4H from 2H or 4L results in the module clicking and chattering and the system stops in 2H.

4. At start up, the vehicle shifts on its own.

5. Indicator lights don't register the correct information.

6. Shifting on the fly isn't smooth and may require stopping in order to complete the shift.

Figure 21

All these conditions can be best understood by taking a close look at a schematic of the electrical system (Figure 21). We will be referring to this schematic throughout this article.

Power In

Power is supplied to the system at 3 points (P1, P2 and P3 in schematic):

P1. This is a direct connection to the battery. This power drives the electric shift control motor and provides current to the instrument cluster lamps. This circuit goes to ground G1.

P2. The electronic shift control module is tied into the ignition circuit. This circuit provides power to the computer and goes to ground G2.

P3. Nighttime illumination is provided by a connection to the vehicle's nighttime illumination circuit, which goes to ground G3.

The electronic shift control module directs power depending on the position of the control switches. You will notice that inputs and outputs to and from the shift module are labeled "A", "B" or "C." "A" circuits are power circuits, "B" circuits are data circuits from sensors and "C" circuits are activating switch and related lamp circuits.

We have already explained the power in circuits "A." The "B" circuits supply data from three sources: The speed sensor, the motor position sensor and either a neutral switch (for automatic transmissions) or a clutch switch (for

manual transmissions).

The speed sensor is important because the vehicle must be stopped for a shift into or out of 4L. The shift module won't make the shift if the vehicle is moving. The shift module also won't make a shift to 4L or back unless an automatic transmission is in neutral or the clutch is depressed on a manual transmission.

Figure 20

The motor position sensor indicates the position of the shift motor shaft. This shaft turns through approximately 270 degrees and should stop at three indexed points, 2H, 4H and 4L (Figure 20). The shift control module needs to know where the shaft is before making a new shift. When this sensor isn't functioning properly or the motor stops slightly off location, the shift control module may become "confused."

The "C" circuits involve the switches on the vehicle's control panel. When everything is working properly, activating a switch will result in either a shift from 2H to 4H or back, or a shift from 4H to 4L ...

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