[Main page] [How it works] [Road test and preliminary checks] [Parts testing] [Wire diagrams] [EEC IV controlled Cruise Control]
Sorry some of the drawings aren't great, but they were done in a hurry. - Jeff
Very simple to operate. get the car up to speed, press the ON button and then the SET\ACCEL button. The car maintains the set speed (give or take a bit).
To move to a faster speed, press the SET\ACCEL button. The vehicle will start to accelerate. Release the button at the desired speed.
To lower your speed, press the COAST button. The cruise will disengage. Keep the button depressed until the vehicle slows to the speed you want and release the button.
If you step on the brake the cruise will disengage.
If you brake to slow down for something and want to get back to your previous set speed, you can use the RESUME button.
Notes: The cruise won't function below about 25 or 30 miles an hour so you must manually accelerate above this to use it.
It will also disengage if the speed drops too far below its set speed. This can happen in a heavy car up a steep grade.
The system does NOT use the brakes so it will gain speed going downhill.
In the 1990s, Ford started using a new cruise control with the servo and amplifier built into one unit. If I recall correctly, the F-Series trucks were among the first to use this. These systems do not use vacuum for the servo. It is electrically driven.
Some models used the Electronic Engine Control (EEC) processor to control the cruise control. Those system used the same basic Servo as this system so diagnosis of that is the same. The only difference is that the Servo doesn't have a feedback potentiometer. The EEC processor uses the throttle position sensor for feedback.
How do you know which you have?? That can be a tough question. :)
1. For one thing, if your cruise control buttons are on the dash or the turn signal stalk it's "hang on" cruise. Factory cruise buttons were always in the steering wheel pad.
|2. Easiest thing may be to look for a cruise control amplifier. It would be under the dash somewhere. MOST are near the steering column, but some were located over the glove box. There's a drawing of the Amp at right. They use one 6, and one 8 pin connector.|
3. You can trace where the servo wires go. If they tie into the main harness that goes to all the electronic engine control sensors then it's processor controlled because the EEC uses its own harness.
4. You can also try the EEC Cruise test on my other page [http://www.thorssell.net/hbook/cruise.html]. If the EEC processor goes through the test then it's built in.
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