2005 denali service ride control / air suspension pump
My pump has gone out, it was pumping for some time each time we started the truck. I understand the pump needs replacing but that will not solve why. It is pumping due to a leak. There are many posts on replacing the expensive air shocks but nothing to just find the leak. If there is a leak, can't the leak be repaired? Buying 2 expensive air shocks seems overkill.
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Re: 2005 denali service ride control / air suspension...
The leak almost 100% of the time is in the air bags of the shocks, there are special tools for isolating the individual shocks and seeing if they leak, but as far as the home repair goes u just replace them or have the dealer test them.
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No. This is basically telling you that the electronic portion of the suspension system has a fault. All the basic mechanical items will still work as normal. It is common on those truck to have the Auto Ride pump go bad for the air suspension in the rear.
Would need to know what DTC'S - diagnostic trouble codes are stored in the module for the autoride suspension . Hooking up a professional type scan tool ,looking at input data to the module etc... Looking at a wiring diagram an testing electrical circuit's using a DMM - digital multi-meter . Reading how the system works ,what all involved in making the system work . This is how a professional Tech would go about diagnosing this .
The automatic level control (ALC) system maintains a desired rear suspension position under all types of towing, hauling and loading conditions. The following components are involved in the operation of the ALC system:
• Air line tubing--Pressurized air from the ALC compressor is pumped to each of the rear shocks via air line tubing.
• Air drier--Pressurized air from the compressor is run through a drier containing a moisture absorbing chemical preventing water accumulation in the rear shocks.
• Compressor--Supplies pressurized air to the rear shocks
• Compressor motor relay--The relay supplies battery positive voltage to the ALC compressor motor.
• Pressure sensor--The electronic suspension control module (ESCM) module provides a 5-volt reference and low reference to the ALC pressure sensor. The module receives the signal voltage that is relative to the air pressure applied to the rear shocks.
• ESCM--Controls the ALC system and electronic suspension control (ESC) system and detects failures in both. The module monitors inputs from the position sensors, and pressure sensor to determine when to raise and lower the vehicle to trim height as the vehicle is loaded or unloaded. The module limits pump activation to 255 seconds to prevent thermal damage.
• Exhaust valve--An electric solenoid activated by the ESCM to vent air pressure from the rear shocks.
• Left and right rear suspension position sensors--The module provides a 5-volt reference and low reference to all 4 of the body-to-wheel suspension position sensors. The sensors send the ESCM a signal voltage that is relative to the rear suspension ride height
• Left and right rear shock absorbers with internal air chambers and dampers--Dampens the rear suspension and maintains trim height depending on the air pressure applied.
if your engine starts up and dies right away the you probably have a fuel pump problem and the service ride control mean that your air ride compressor has gone bad just turn your key to the on position and wait about 30 seconds you will here buzzing from the left rear wheel area if the compressor is working
That is an indication that your air shocks at the rear needs to be replaced or there is a sensor that may have gone bad, event the air pump mey not be working. Most owners replace the more expensive air shocks with good conventional shocks like Monroe Reflex Shocks if there not towing heavy trailers. You can have the conventional shocks installed and have the ride control system deactivated. First check your fuse just t make sure the fuse to the air compressor has not gone bad, and the air ride leveling sensor, wire harness has not been damaged due to corrosion.
the only way to know is to call gm and if they have not changed anything on this unit it would be ok if they did not then you can not use the gm parts dept can tell you this immediatley as soon as they look it up/ Please rate my response thank you very much