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Attachment III - Technical Information





Table of Contents

OVERVIEW

This program involves removing the 4W1Z-14A411-BC Fused Jumper Harness (FJH) that was previously installed during service on the affected vehicles and installing a Universal Fused Jumper Harness (UFJH), or a new Speed Control Deactivation Switch (SCDS).

NOTE:
Do not perform an Interim Repair (SCDS Disconnect) on any of the affected vehicles in this program. Call the Special Service Support Center if you do not have the necessary parts to complete the final repairs.

SPEED CONTROL DEACTIVATION SWITCH (SCDS) LOCATION

In most late model year vehicles involved in this recall, the SCDS is located on the master cylinder. In early model year vehicles (1992-1998), the SCDS may be located on the master cylinder, but is often found on a brake line distribution block or on the brake proportioning valve. If in doubt, just follow the metal brake lines from the master cylinder until the switch is found.

^ On early model year E-Series vehicles, the SCDS is located on the left frame rail.

^ On E-450 models only, remove the 3 screws and position the coolant degas bottle forward to allow access to the SCDS and servo.

^ On F-53 vehicles, if the SCDS is not located on the master cylinder, it may be located in a brake line junction block approximately 457 mm (18 in) below the master cylinder. It may be necessary to reposition wiring harnesses and/or remove add-on equipment in order to locate the switch.

SPEED CONTROL DEACTIVATION SWITCH (SCDS) INSPECTION

NOTE:
On E-1 50/250/350 it may be necessary to lift the vehicle to disconnect the SCDS.

Remove the electrical connector from the speed control deactivation switch and check the fused jumper harness connector end for the presence of brake fluid. Cut the tie straps from the fused jumper harness 4W1 Z-1 4A41 1-BC and remove the fused jumper harness.

^ If there is no evidence of brake fluid on the connector, install a Universal Fused Jumper Harness.

^ If there is the presence of brake fluid on the connector, replace the Speed Control Deactivation Switch.

FUSED JUMPER HARNESS (FJH) IDENTIFICATION





The new universal fused jumper harness has a double fuse instead of a single fuse. See Figure 1.





PARTS APPLICATION CHART

UNIVERSAL FUSED JUMPER HARNESS (UFJH) INSTALLATION

1. Connect the universal fused jumper harness (Part Number 8W7Z-14A411-C) to the SCDS and the vehicle harness.





2. Secure the jumper harness to the existing harness with tie straps, making sure the fuse holders are positioned vertically with the cap facing upward. Wrap the tie straps underneath, then over the top of the existing harness and verify proper fuse holder orientation. See Figure 2.

LEAKING SPEED CONTROL DEACTIVATION SWITCH (SCDS) REPLACEMENT

NOTE:
The brake pedal must not be depressed during the removal and replacement of the SCDS.

1. Check the brake fluid level at the master cylinder and, if necessary, fill to maximum fluid level.

NOTICE:
DO NOT apply fluid to the electrical connector or damage to the connector may occur.





2. Add a few drops of Motorcraft High Performance DOT 3 Motor Vehicle Brake Fluid, PM1-1 or PM-1-C (US), CPM-1-C (Canada), to the fluid port at the threaded end of the new SCDS. See Figure 3.

NOTICE:
Do not allow any foreign material to enter the master cylinder port once the SCDS is removed.

NOTE:
Call the Special Service Support Center for assistance if brake fluid does not flow from the SCDS fitting when the SCDS is removed.

NOTE:
If the new SCDS is not installed immediately after the original switch is removed, the master cylinder brake fluid could drop below the minimum level and air could enter the brake system. If this should occur, air must be bled from the brake system at all 4 wheels. In this situation, the labor to bleed the brake system will not be covered under this program.

3. Remove the SCDS.

4. With the brake fluid reservoir cap removed, observe for brake fluid dripping/draining from the SCDS fitting. As soon as brake fluid begins to bleed from the fitting, install the new SCDS and tighten to 18 Nm (13 lb-ft).

5. Check the brake fluid level at the master cylinder, fill to maximum fluid level and install the brake fluid reservoir cap.





6. Disconnect the speed control servo and inspect the vehicle harness connector for heat damage. See Figure 4.

^ If no heat damage is found at the speed control servo connector (even if there is presence of brake fluid in the connector), proceed to new step.

^ If the speed control servo connector is heat damaged, call the Special Service Support Center for further instructions.

7. With the speed control servo disconnected, use shop air only to blow the SCDS harness electrical connector and the servo connector dry of any trace of brake fluid. Do not use any type of solvent to clean the connectors.

8. Cut approximately 3 mm (1/8 in) off the grease tube applicator tip.





9. Before installing the jumper harness, fill the vehicle harness end of the jumper (male pin connector end) with Motorcraft Electrical Grease II XG-15-A. See Figure 5.

10. Install the adapter jumper harness by connecting it to both the SCDS and the vehicle harness. Using the provided tie strap, secure the jumper harness to a nearby component such as the speed control cable or another wire harness.

NOTICE:
Be sure to apply an adequate amount of grease to the vehicle harness connector only. DO NOT apply the grease directly to the connector of the servo module.





11. Apply a 5 mm (3/16 in) high bead of Motorcraft Electrical Grease II XG-15-A across the entire width and length of the servo vehicle harness connector. See Figure 6.

12. Reconnect the servo connector.

13. Release the vehicle.
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