Why doesn't the air ride suspension for my expedition air up?

Answer 1

The best thing that I can tell you to do is to first check the 3 fuses for

the system. They are Fuse #6 (5 amp) under the dash, and fuses #4 (15 amp) and

#15 (50 amp) in the engine bay fuse box.

Next, you will need to gain access to the air ride control module. Look at the

plug going into the side of the module and find pins 1, 4 and 21. Pins 1 and 21

will have power at all times (if not, you have a bad wire or a bad Air ride

Service switch (passenger foot well area). Pin 4 will have power when the

ignition switch is in the RUN position. If no power here, then you have a

wiring issue or a bad fuse (fuse #6 under the dash).

Next, put the truck into a position that it would normally raise the suspension

to normal height. Measure from pin 30 to chassis ground. Should have 12 VDC

there. If not, you have a bad control module.

Next, remove the relay for the compressor motor. Look on the relay and you will

see that the terminals are marked with the letters A, B, C, and D. Where

terminal A plugs in, verify that you have 12 VDC there. If not, you have a bad

50 amp fuse. Next, verify that you have ground where terminal D connects. If

you don't have ground here, then you have a bad wire between the relay and the

control module.

Finally, with the relay removed, install a jumper (14 gauge solid core wire)

between where terminals A and B are. Does the compressor work now? If no, then

you have a sensor issue (write me and I will help you with that).. If yes, then

you have a bad relay.

Hope this helps.