I understand that this may not be the correct forum, but there is ZERO traffic anywhere else on this site. I have tried and tried in all other forums, but this is the ONLY place where I can get any help. Please restore my last thread so that I can have some help on this problem. I need help ASAP on this as I need to drive the vehicle to work tomorrow.... I was looking for help from Superfords, and any other Ford Tech that we have here. All I want is a little bit of help... PLEASE.... with sugar on top.

https://www.f150online.com/forums/sh...hreadid=152452

 

93cobra, my 98 expedition has air suspension, and it will fully inflate if there is an accident or you trigger a switch under the passenger side dash to fully inflate it. The explorer should have a similar switch as well. Check this switch and reset it, I think that is your problem.

 

Thanks so much for the reply - finally some traffic on the topic. It is a 99 Expedition, so it is the same as yours. I have an on/off switch in the pass. footwell that I checked yetserday. If I turn it off, that does nothing for me. It will not deflate, and the compressor does not come on anymore. It has to be one of the three items in the rear - height sensor, or one of the solenoids. Any other idea's what it could be? Fordpartsonline had each item at $68 ea. The rear end will just not drop back down at all.

 

Try disconecting the battery and resetting the computer. then do the switch in the footwell. It might help.

Also you might wanna try moving the position of the sensor downwards, maybe something hit it and it was forced up?

 

I turned the switch off last night, and then disconnected the battery... still the same thing this morning. How would I adjust the sensor? I was looking at it last night and saw how it disconnects from the rear axle, but had no idea how to adjust it if that was what it needed. Not even sure which way to adjust it so that it comes back down to normal level.
I think MMCGHILL has this same thing on his too... maybe he will see this too and have some pointers? The front is where it has always been, so I do not think there is a problem there. Auto Zone cannot read this code because it is not an engine related feature. Frustrating.

 

Is yours a 4x2 or 4x4 expedition?

I have always read that the sensor is on a "slider" of sorts and can be loosened and adjusted up and down.

 

It is a 4X4. I looked at it more and did not see how to adjust it.
Those jerk moderators at the Lightning forum keep moving this out of there.

 

Having trouble with my 98 Navigator with the compressor not coming on I have spent some time troubleshooting the Load Leveling Suspension. I would suggest getting the CD service manual. It's given me alot of help. This is from the section on the sensor opperation. "Air Suspension Height Sensor(s)

Two height sensors are mounted on the vehicle. The sensors send a voltage signal to the air suspension control module. The output ranges from approximately 4.75 volts at minimum height (when the vehicle is low or in full jounce), to 0.25 volts at maximum height (when the vehicle is high or in full rebound). The sensors have a useable range of 80 mm (3 in) compared to total suspension travel of 200-250 mm (8-10 in) at the wheel. Therefore, the sensors are mounted to the suspension at a point where full suspension travel at the wheel is relative to 80 mm (3 in) of travel at the height sensor. The front height sensor upper socket is attached to the frame bracket at the upper control arm mounting area and the lower height sensor socket is attached to the upper control arm bracket. The rear height sensor is attached between the No. 5 frame crossmember (upper socket) and the panhard rod (lower socket). Replace a sensor as a unit.

When the height sensor indicates that the vehicle is lower than trim under normal driving conditions, the air compressor will turn on and pump compressed air to the system. When the sensor indicates that the vehicle is raised above trim under normal driving conditions, this will cause the air to be vented from the system to lower the vehicle to its trim height level.

I also looked in the section for diagnosing failures with the height sensor.

Disconnect the lower end of the rear air suspension height sensor.

2 NGS

3

Select air suspension control module active command menu and activate PID RHGTSEN.

4 Note:
The voltage will inversely vary with the length of the air suspension height sensor.

While watching the PID display, slowly move the rear air suspension height sensor up and down its full travel.

l Does the voltage vary between 0.25 volts and 5 volts?

è Yes

RECONNECT the rear air suspension height sensor. Go to «G3».

è No

REPAIR circuit 432 (BK/PK). TEST the system for normal operation.

Some of it is hard to make sense without the pictures as I cut and paisted the text.

This is what I would do...

1. Find the connector comming from the sensor, ther should be three wires.
2. Disconnect the lower end of the sensor from the bracket.
3. Somehow tap into the wires with a volt meter while connected with power on.
4. Black wire should be ground. Dark blue should be power, I'm guessing 5volts. Dark green should be the signal output.
5. When moving the arm up and down you should see the voltage change on the green wire from .25 to 5 volts.

My guess is it is stuck at somewhere around 4.75 volts so the control module is always trying to raise the height.

Good Luck

Smithj