Question about 2000 GMC Jimmy

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Rear Air Shock Problems

We have wet shocks, the air compressor runs almost constantly, but the car is running level, not sagging in the back. The shocks feel fairly stable. Do I need new shocks, or new air lines or both?

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  • Anonymous Mar 18, 2014

    New shocks installed now clunking noise when hit a bump

  • Anonymous Mar 26, 2014

    Rear shocks dount charge up

  • Anonymous Mar 27, 2014

    i did rear shocks nad air bag so the car still down,i don't know why

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Springs & air bags in the shock hold the truck level
if they are wet with oil the seal is leaking
replace the shocks

Posted on Dec 13, 2008

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The car will still run level due to the fact the springs are holding them up. If the shocks are wet there internal seals are shot, so it is time to replace them.

Posted on Dec 13, 2008

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Ttrying to fine out where to put the air for the airshock


Vehicles: Cadillacs with ALC-controlled rear shock absorbers

Each rear shock absorber has an ALC (air) port. One may disconnect the ALC air line and try to add air, but this is unlikely to work, since there is no spring-loaded valve to close the port off immediately (like a tire).

A better method for inflating the rear shocks to see if they hold air is to supply 12V DC (from the battery) directly to the ALC system (air) compressor.

Debugging your Cadillac's ALC system can be a challenge. Here are a few basics.

Here's a depiction of the ALC port on the rear shock - found at the end of the ALC air tube.


12_2_2011_12_54_42_am.jpg

Fig. 1 The ALC connection on the rear shock absorber

Here's a close-up of the Cadillac ALC port on the rear shock


12_2_2011_12_59_49_am.jpg

Fig.2 Cadillac ALC air line fitting

---------------------------------------------------------------------------------------------
Automatic Level Control System - General Description
Vehicles Without Road Sensing Suspension

The Automatic Level Control (ALC) system automatically adjusts the rear height of the vehicle in response to changes in vehicle loading.

The ALC system consists of a height sensor, an air compressor assembly, an ALC compressor relay, an intake hose and filter, an air tube, and two rear shock absorbers . The air compressor assembly consists of an air compressor and an air dryer mounted on a bracket. The air compressor head is a replaceable part of the air compressor. The (air) exhaust solenoid is a non-replaceable part of the air compressor head.

The compressor is activated when the ignition is on, and weight is added to the vehicle. The exhaust solenoid is connected directly to the battery (+), enabling the system to exhaust with the ignition on or off when excess weight is removed.

Vehicles With Road Sensing Suspension
The Automatic Level Control (ALC) system automatically adjusts the rear height of the vehicle in response to changes in vehicle loading.

The ALC system consists of the CVRSS control module, two CVRSS position sensors, an air compressor assembly, an ALC compressor relay, an intake hose and filter, an air tube, and two rear shock absorbers. The air compressor assembly consists of an air compressor and an air dryer mounted on a bracket. The air compressor head is a replaceable part of the air compressor. The exhaust solenoid is a non-replaceable part of the air compressor head.

The vehicles rear vertical height is measured by the two CVRSS position sensors. These two position sensors convert this rear height measurement into an analog voltage (0 to 5 volts DC) which is read by the CVRSS control module. The control module then determines what action (exhaust, compress, or no action) shall take place. To compress, the CVRSS control module switches the low-side of the ELC compressor relay to ground.

The air compressor is enabled (switched to battery only when the ignition is on. The air compressor is activated when a sufficient amount of weight has been added to the vehicle.

The exhaust solenoid is enabled at all times. The exhaust solenoid is activated when weight is removed from the vehicle.

Automatic Level Control System Operation w/o F45

Raising the Vehicle
When a load is added to the vehicle, the vehicle body moves down causing the sensor actuating arm to rotate upward. The upward arm movement activates an internal timing circuit and, after an initial fixed delay of 17 to 27 seconds, the sensor provides a ground to complete the compressor relay circuit. The 12V (+) circuit to the compressor is then complete and the compressor runs, sending pressurized air to the shock absorbers through the air tubes.

As the shock absorbers inflate, the vehicle body moves upward rotating the actuating arm towards its original position. Once the body reaches its original height, +/- 25 mm (+/- 1 in), the sensor opens the compressor relay circuit, and the compressor is turned off.

Air Compressor Head Relief Sequence
In order to reduce current draw during air compressor starting, the height sensor performs an air compressor head relief sequence before air compressor operation. This sequence reduces the air pressure in the air compressor cylinder during start-up. The air compressor head relief sequence occurs as follows:

Exhaust solenoid is energized.
Air compressor is activated 1.3 seconds after the exhaust solenoid is energized.
Exhaust solenoid is de-energized 0.5 seconds after the air compressor is activated.
Lowering the Vehicle
When a load is removed from the rear of the vehicle, the body rises, causing the sensor actuating arm to rotate downward. This again activates the internal timing circuit. After the initial fixed delay, the sensor provides a ground to complete the exhaust solenoid circuit, energizing the solenoid. Now, air starts exhausting out of the shock absorbers, back through the air dryer and exhaust solenoid valve, and into the atmosphere.

As the vehicle body lowers, the actuating arm rotates to its original position. When the vehicle body reaches its original height, +/- 25 mm (+/- 1 in), the sensor opens the exhaust solenoid circuit, which closes the exhaust solenoid and prevents air from escaping.

Air Replenishment Cycle
The sensor actuating arm position is checked when the ignition is turned on. If the sensor indicates that no height adjustment is needed, an internal timer circuit is activated. After about 35 to 55 seconds, the compressor is turned on for 3 to 5 seconds. This ensures that the shock absorbers are filled with the proper residual pressure. If weight is added to or removed from the vehicle during the time delay, the air replenishment cycle is overridden, and the vehicle rises or lowers after the normal delay.

Automatic Level Control System Operation w/ F45

Raising the Vehicle
When a load is added to the vehicle, the vehicle body moves down causing the sensor actuating arm to rotate upward. The upward arm movement activates an internal timing circuit and, after an initial fixed delay, the CVRSS control module provides a ground to complete the compressor relay circuit. The 12V (+) circuit to the compressor is then complete and the compressor runs, sending pressurized air to the shock absorbers through the air tubes.

As the shock absorbers inflate, the vehicle body moves upward rotating the actuating arm towards its original position. Once the body reaches its original height, +/- 25 mm (+/- 1 in), the compressor relay circuit is opened and the compressor is turned off.

Air Compressor Head Relief Sequence
In order to reduce current draw during air compressor starting, the CVRSS control module performs an air compressor head relief sequence before air compressor operation. This sequence reduces the air pressure in the air compressor cylinder during start-up. The air compressor head relief sequence occurs as follows:

Exhaust solenoid is energized.
Air compressor is activated 1.3 seconds after the exhaust solenoid is energized.
Exhaust solenoid is de-energized 0.5 seconds after the air compressor is activated.

Lowering the Vehicle
When a load is removed from the rear of the vehicle, the body rises, causing the sensor actuating arm to rotate downward. This again activates the internal timing circuit. After the initial fixed delay, the CVRSS control module provides a ground to complete the exhaust solenoid circuit, energizing the solenoid. Now, air starts exhausting out of the shock absorbers, back through the air dryer and exhaust solenoid valve, and into the atmosphere.

As the vehicle body lowers, the actuating arm rotates to its original position. When the vehicle body reaches its original height, +/- 25 mm (+/- 1 in), the exhaust solenoid circuit is opened, which closes the exhaust solenoid and prevents air from escaping.

Air Replenishment Cycle
An air replenishment cycle (ARC) is commanded after each ignition-ON cycle. The purpose of the ARC is to ensure that the ALC system is operating at or above minimum air pressure (residual air pressure). The ARC occurs as follows:

The EXHAUST SOLENOID IS ENERGIZED 20 seconds after the ignition has been turned on.
The AIR COMPRESSOR IS ACTIVATED 1.3 seconds after the exhaust solenoid is energized.
The EXHAUST SOLENOID IS DE-ENERGIZED 0.5 seconds after the air compressor is activated.
The AIR COMPRESSOR IS DEACTIVATED 3.2 seconds after the exhaust solenoid is de-energized.

Dec 01, 2011 | 1998 Cadillac DeVille

1 Answer

How do iservice ride control


this is for the Auto Level for the rear axle,in "most cases" the compressor is bad, and one or both rear shocks leak air. What happens is a shock leaks air and the compressor tries to keep it up, but runs so long that it burns up or is worn out from running too much. plan on at least $1000.00. but have it checked out, YMMV

Sep 15, 2011 | 2003 GMC Yukon Denali

1 Answer

Rear air suspension problem on a 95 deville. i hear the compressor go on yet once the car is drive a service suspension light comes on


In my opinion the air ride suspension is one of automobile's biggest mistakes. I see this a lot.

The first thing you must do is isolate the problem.

Jack up the back of the car and remove the rear wheels.

Now your shocks are visible. Inspect the rubber boots in the midsection of the shock, If this is worn or torn they will need to be replaced as they dry out once the integrity of the boot is jeopardized.

Next turn the key forward to turn in the compressor that you hear. And follow the thin black air lines that run into the side of the shock. A lot of times, especially on a vehicle this age, these lines will at some point rub on the frame or other item and have holes. Just listening for air leaks and running your fingers along the lines (feeling for bumps or holes) will give you a quick answer on this.

The only thing left in the system is the compressor itself, just remove the air lines from the shocks and as the compressor runs feel the end for air pressure. If you feel it the compressor is working.

Once you have isolated the issue your vehicle faces, feel free to come back and ask for assistance in replacing them. Be thourough and check everything though because 1 bad element will make future problems inevitable.

Please feel free to rate my answer and come on back to FixYa anytime.

Sep 04, 2010 | 1995 Cadillac DeVille

1 Answer

Where is the a.i.r. pump located



The air pump for the secondary air system (emission control device) is located under the battery. If you do replace it, replace the check valve too, it is on top of the exhaust manifold and connected to the pump with a hose. The check valve fails and ruins the pump. Source(s): http://repairpal.com/volvo-850-1997/comm…
http://repairpal.com/air-pump-check-valv…
http://repairpal.com/air-pump

OR


I think they are talking about the pump to provide vacuum to the climate control when the turbo is putting boost in the intake manifold. The vacuum can come from an electric pump or from an engine driven pump, something like an old engine driven fuel pump. I needed an electric pump for my 765T, and all the wrecking yards wanted to sell me the engine driven form. (A new one was $500, and it wasn't that important to me.)

An engine that takes the engine driven pump will have a hole in it while the others will not have a hole. Source(s): 35 years maintaining my own cars, including 17 years with a 1985 765T


OR



Rear Suspension Leveling Air Compressor
RH front of vehicle, attached beneath the fascia

Rear Suspension Leveling Air Compressor Relay K19
Lower I/P, to the RH side of the steering column, on the relay box


Automatic Level Control System Operation Check
Support the rear wheels or support the rear lower control arms when certain tests require raising the vehicle on a hoist. Use two additional jack stands in order to support the rear lower control arms in the normal curb weight position when a frame type hoist is used. Refer to Trim Height Specifications in Suspension General Diagnosis.

Refer to ALC Suspension System Check for electrical troubleshooting of the Automatic Level Control (ALC) system, or if DTC's are present.

Diagnosing Leveling Complaints Without DTCs Present Procedure
Perform the following preliminary inspections before performing the system performance test:

Inspect the ignition (pin A & pin H) at the ALC sensor connector.
Ensure that the ignition (pin A & pin H) at the ALC sensor connector connection is secure.
Inspect the ground (pin E) at the ALC sensor connector.
Ensure that the ground (pin E) at the ALC sensor connector connection is secure.
Inspect the ALC sensor link.
Ensure that the ALC sensor link is properly secured to the actuator arm.
Inspect the ALC sensor actuator arm for damage.
ALC Diagnosis Table Step
Action
Value(s)
Yes
No

1
Has the ALC compressor assembly and the air tube been replaced?
--
Go to Step 7
Go to Step 2

2
Raise and support the vehicle. Lifting and Jacking the Vehicle in General Information.
Inspect the air tubes running from the ALC compressor to both rear shock absorbers.
Inspect the air tube connection at the ALC air dryer.
Are the air tubes damaged and/or disconnected?
--
Go to Step 13
Go to Step 3

3
Squeeze the left rear shock absorber in the middle of the air sleeve.

Did the air sleeve slightly compress?
--
Go to Step 5
Go to Step 4

4
Operate the ALC system for 60 seconds.
Test the air tube-to-air dryer connection for leaks using a soap bubble solution.
Is a leak evident?
--
Go to Step 20
Go to Step 5

5
Disconnect the air tube from the ALC dryer.
Connect the Pressure Gauge to the ALC dryer.
Close the toggle valve on the Pressure Gauge .
Operate the ALC compressor.
Did the pressure build to the specified value?
80 psi
Go to Step 6
Go to Step 10

6
Shut off the compressor when the pressure reaches 80 psi.
Monitor the gauge for 1 minute.
Did the pressure leak down?
--
Go to Step 10
Go to Step 7

7
Connect the Pressure Gauge to the right rear shock absorber. Ensure that the toggle valve on the Pressure Gauge is away from the shock absorber.
Close the toggle valve.
Pressurize the shock absorber at the toggle valve on the Pressure Gauge to 80 psi.
Monitor the gauge for 1 minute.
Did the system leak down?
--
Go to Step 11
Go to Step 8

8
Use the toggle valve on the Pressure Gauge in order to slowly release the air pressure.
Disconnect the Pressure Gauge from the right rear shock absorber.
Connect the Pressure Gauge to the left rear shock absorber.
Pressurize the Pressure Gauge to 80 psi.
Monitor the gauge for 1 minute.
Did the pressure leak down?
--
Go to Step 12
Go to Step 9

9
Use the toggle valve on the Pressure Gauge in order to slowly release the air pressure.
Disconnect the Pressure Gauge from the left rear shock absorber.
Connect the Pressure Gauge , inline, at the tee near the rear of the vehicle.
Reconnect the air tube to the ALC dryer.
Open the toggle valve on thePressure Gauge .
Using shop air, pressurize the system to 80 psi at the service connection of the Pressure Gauge .
Monitor the pressure gauge for 1 minute.
Did the pressure leak down?
--
Go to Step 14
Go to Step 20

10
Replace the following components:

• Replace the ALC compressor. Refer to Air Compressor Replacement .

• Replace the air tube. Refer to Air Tube Replacement .

Are the replacements complete?
--
Go to Step 20
--

11
Slowly open the toggle valve on the Pressure Gauge in order to relieve the air pressure.
Replace the right rear shock absorber. Refer to Shock Absorber Replacement in Rear Suspension.
Reconnect all of the air tube connections.
Is the shock absorber replaced, and are all of the air tube connections reconnected?
--
Go to Step 20
--

12
Slowly open the toggle valve on the Pressure Gauge in order to relieve the air pressure.
Replace the left rear shock absorber. Refer to Shock Absorber Replacement in Rear Suspension.
Reconnect all of the air tube connections.
Is the shock absorber replaced, and are all of the air tube connections reconnected?
--
Go to Step 20
--

13
Are any of the air tubes damaged?
--
Go to Step 14
Go to Step 18

14
Replace the air tube that runs from the air dryer to the two rear shock absorbers.

Is the replacement complete?
--
Go to Step 15
--

15
Remove the ALC air dryer from the compressor assembly.
Shake the ALC air dryer with the head connection down.
Did water/moisture come out of the ALC air dryer when the dryer was shaken?
--
Go to Step 16
Go to Step 17

16
Replace the ALC air dryer. Refer to Automatic Level Control Air Dryer Replacement .

Is the replacement complete?
--
Go to Step 17
--

17
Replace the air compressor head. Refer to Automatic Level Control Air Compressor Head Replacement .

Is the replacement complete?
--
Go to Step 18
--

18
Install the ALC compressor on the vehicle.
Reconnect all of the air tube connections.
Is the ALC compressor reinstalled, and are all of the air tube connections reconnected?
--
Go to Step 20
--

19
Repair the air tube-to-air dryer connection leak.

Is the repair complete?
--
Go to Step 20
--

20
Reconnect all of the connectors that were disconnected.
Reconnect all of the components that were removed.
Clear all of the codes with the ignition ON and with the engine OFF.
Wait at least 5 minutes.
Is the rear of the vehicle trim level?
--
System OK
--






Aug 04, 2010 | 1998 Cadillac Catera

2 Answers

Lift sensor for rear of 1988 Deville


To begin with, check the "ride level" fuse and make sure that the ride level compressor does work, and you should be able to hear that the ride level compressor is working when the ride level system is leveling the vehicle.

The ride level system uses an air compressor and either an air type of shocks or a type of air billow to raise and lower the vehicle, there is an adjustment to set the ride height and it is located under the vehicle and there is a control lever or rod that should be connected between the rear axle and a switch that is mounted on the body of the vehicle, and there will be an adjustment slot in the control lever between the switch and the body, and that is how you would adjust the ride level height, but be sure that the vehicle can not drop any further down if someone is under the vehicle trying to adjust the ride height.

However, you might find that the control lever to the ride level has fallen off from the switch on the body or it has come loose from the rear axle, and it is just hanging there not operating the switch on the body that controls the the ride level compressor, or there might be a blown out air shock or billow, or you might find that an air line from the compressor is leaking and the ride level compressor will just run continuously until it blows out the fuse, and if that is the case you might also find out that the air compressor has burned out from running continuously.

I hope that this information will help you to solve your ride level problem.

Jun 04, 2010 | 1988 Cadillac Sedan DeVille

2 Answers

I have 94'crown vic with rear air ride suspension problems. The back end won't rise. Any help is appreciated.


Start by checking the fuses for the air compressor for the rear suspension. these will be listed in your owners manual. Failing this it could be the compressor motor or wiring to the motor, unless you can hear the compressor working. If the compressor is running but not adjusting the back of the car then you have an air leak in one of the shocks or air lines.
if you find it is a fuse, also listen for the compressor motor running and an air leak, if the system is running constantly to make up for a leak , that may be what blew the fuse.

Hope this helps
Ed

Mar 29, 2010 | 1994 Ford Crown Victoria

1 Answer

Mazda mpv 96 problems with the leveler


Expensive to fix. There is a lever behind the spare tire which senses load and accordingly turns on the air compressor to pump up the rear shocks. The problem I've had is the one rear shock air line will develop a leak by rubbing against the shock cover which causes the system to continually bleed down. These shocks are about $400.00each to replace new.

Jan 04, 2010 | 1992 Mazda MPV

1 Answer

2000 buick LeSabre - rear leveling system problems


The rear leveling trip switch is located on driver's side near rear air shock on the frame. Check for leaks in air line.

Oct 10, 2009 | 2000 Buick LeSabre

2 Answers

97 catera leveling light flashes all the time


The problem is a leaking air shock(s). My 1997 catera had this problem also. I drove the rear wheels up on a set of ramps and went underneath. There is a sensor located close to the rear axle's that moves up when the car is loaded in the rear. (luggage/person in the back seat). When the car senses the extra weight, a small compressor located up under the hood pumps air to the air shocks until the car is back level again. With the key turned on, and the engine off, You can actually move this sensor with your hand and after about 45 seconds, you will hear the small electric compressor come on and see the rear of the car rise. Even if the shock is leaking, the car will still rise but you can hear/feel the air leak on the rubber boot of the shock. The reason the light never stops flashing is because of the air leak the car never really reaches proper leveling. I know what your thinking, "I didn't have extra weight in the car"..doesn't matter car still levels itself from time to time without extra load in the rear. Possible road conditions etc. and also the fact your basically riding around with only one rear shock working like it should. hope this helps......dave

Dec 10, 2008 | 1997 Cadillac Catera

2 Answers

Electronic level control


I had this problem once, I pulled the fuse on the air compressor, then released the air from the shock, by removing the air line from the shock. Then I replace the fuse. So far It seems to work again.
Must have somehow gotten out of range for the auto-level controller, letting the air out manually reset it. Worked for me!

Aug 24, 2008 | 1999 Chevrolet Venture

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