Air Ride 2002
Thread Starter
Member
Joined: May 2020
Posts: 56
Likes: 3
From: Mullica Hill NJ
Air Ride 2002
Hello All,
I have a 2002 Lincoln Backwood with Air Ride. This truck is based on a ford F150.
I recently noticed that the air ride / compressor has not been working. I had replaced the compressor 6 Months ago.
Upon visual inspection I found the rear ride height sensor was in terrible shape eaten up by salt rust and corrosion. I replaced that sensor and no response from the system.
The fuses all read good. I connected my scanner and it sees the air ride module and reporting no codes. I disconnected the SS Relay (four Wires) and get 12 volts on the
wo heavy wires, when jumped together the compressor comes on. The third wire and the Positive 12 Volts will drive a 12 volt window motor so I think I have good power there.
The fourth wire shows 4.8 volts when the key is on. I believe that is the signal wire commanding the compressor to turn on. At that point I thought the relay was suspect and
replaced it Still nothing. It would seem to me that the compressor should come on.
At this point Im at a loss.
Can anyone point me in the right direction?
Thank you
I have a 2002 Lincoln Backwood with Air Ride. This truck is based on a ford F150.
I recently noticed that the air ride / compressor has not been working. I had replaced the compressor 6 Months ago.
Upon visual inspection I found the rear ride height sensor was in terrible shape eaten up by salt rust and corrosion. I replaced that sensor and no response from the system.
The fuses all read good. I connected my scanner and it sees the air ride module and reporting no codes. I disconnected the SS Relay (four Wires) and get 12 volts on the
wo heavy wires, when jumped together the compressor comes on. The third wire and the Positive 12 Volts will drive a 12 volt window motor so I think I have good power there.
The fourth wire shows 4.8 volts when the key is on. I believe that is the signal wire commanding the compressor to turn on. At that point I thought the relay was suspect and
replaced it Still nothing. It would seem to me that the compressor should come on.
At this point Im at a loss.
Can anyone point me in the right direction?
Thank you
Senior Member
Joined: Mar 2021
Posts: 4,783
Likes: 2,387
Your air suspension bags must be holding up leak free or the truck would go low at some point.
If this is the case, the compressor will not come on for 'no reason' unless commanded to do so..
The sensors have to go below a certain point to signal the Module to turn the compressor on or nothing happens.
The compressor takes as lot of current. Be sure the fuse or link is not open and the relay and all connections are good.
Also the control switch is on and not faulty.
Only easy way to test if the compressor will come on is operate the rear sensor by disconnecting the mounting and moving the Arm.
You must be careful under the truck that the system don't vent the bags and let the truck down on you.
.
Other info:
The system has an air dryer or should have one to keep the air dry in cold temps to prevent lines from freezing and blocking the lines from the air dryer out to each air bag and freeze the solenoid from working..
In the air bags are solenoids that open when the compressor turns on for either filling or venting should a bag raise the truck height too high according to the sensor controlling it.
Good luck.
If this is the case, the compressor will not come on for 'no reason' unless commanded to do so..
The sensors have to go below a certain point to signal the Module to turn the compressor on or nothing happens.
The compressor takes as lot of current. Be sure the fuse or link is not open and the relay and all connections are good.
Also the control switch is on and not faulty.
Only easy way to test if the compressor will come on is operate the rear sensor by disconnecting the mounting and moving the Arm.
You must be careful under the truck that the system don't vent the bags and let the truck down on you.
.
Other info:
The system has an air dryer or should have one to keep the air dry in cold temps to prevent lines from freezing and blocking the lines from the air dryer out to each air bag and freeze the solenoid from working..
In the air bags are solenoids that open when the compressor turns on for either filling or venting should a bag raise the truck height too high according to the sensor controlling it.
Good luck.
Thread Starter
Member
Joined: May 2020
Posts: 56
Likes: 3
From: Mullica Hill NJ
Bluegrass, thank you for the reply, Yes I have gone under the truck disconnected the arm and still nothing. The ride height from Axle housing to the bumper is about an inch and a half.
The correct ride height is three and a half inches.
Akdoggie yes I have performed those very same tests. Thats why I dont understand why its not working..... Im not getting a DTC on my laptop.
Tomorrow is another day, Ill try again.
Thank you for your input, Ill keep you posted.
The correct ride height is three and a half inches.
Akdoggie yes I have performed those very same tests. Thats why I dont understand why its not working..... Im not getting a DTC on my laptop.
Tomorrow is another day, Ill try again.
Thank you for your input, Ill keep you posted.
Thread Starter
Member
Joined: May 2020
Posts: 56
Likes: 3
From: Mullica Hill NJ
Bluegress,
Yes you are correct
However the software on my laptop indicates a separate suspension control module along with
EATC
OBDII
IC
ABS
PCM
PAM
LTM
RCM
GEM
RAF
and of course RASM
the Rear Air Suspension Module
Yes you are correct
However the software on my laptop indicates a separate suspension control module along with
EATC
OBDII
IC
ABS
PCM
PAM
LTM
RCM
GEM
RAF
and of course RASM
the Rear Air Suspension Module