Question about 2004 Land Rover Range Rover
Suspension Freezing at Normal Height (Warning Light on and "Suspension Inactive" Message)
Cause 1: Sticking Pressure Switch
The pressure switch (ANR3902) is subject to intermittent sticking, producing a false Testbook diagnosis of "inlet solenoid valve sticking". Replacement is s simple matter of unscrewing the old one from the valve block and putting the new one in with some Loktite (see diagram at right from Technical Service Bulletin). Even if you don't have a Testbook, shotgunning the problem by replacing this valve would be worthwhile and will very likely restore normal operation.
To prevent this problem, it might help to drain the air reservoir at least once a year so to minimize air valve corrosion. Stefan Joer of Germany reported that his 2002 build date RRIII, he received the dreaded "Air Suspension (Niveau System in German) Inactive" message and the dealer was unable to find the problem. So he got the workshop manual and traced the cause to the valve block. He reports "There are four airvalves, and inside these airvalves there is one small valve, which is operated by the outer solenoid. I took one apart and all what I could see was a lot of corrosion on the small inner valve, caused by the moisture/water of the compressed air. It is very important that you drain your air reservoir one time a year and that you check the drier of the EAS system. If the valve block or air reservoir needs replacing, unfortunately you get the valveblock only with the airreservoir at about 700 Euros!"
Cause 2: Compressor Overheat Signal
If the ECU thinks the compressor is overheating it will freeze height changes and display "Suspension Inactive". It will also store the code storing code 41 "Compressor Temperature Rises when Static". On 2003 and 2004 models up to VIN 4A155162 this can sometimes be overcome by updating the air suspension ECU software. The later software accepts higher readings from the compressor temperature sensor. Otherwise, the problem might be a faulty compressor or temperature sensor, or possibly a leak in the system causing the compressor to be on constantly.
Cause 3: Frozen Pressure Relief Valve
I think this is another possible cause of the "suspension inactive" signal. If the vehicle is already at standard height on a cold morning, it may be fine for driving but if you try to request a height change it will not respond (and might give the "Air Suspension Inactive" message until the pressure relief valve has thawed out. See "Failure to reach normal ride height" below.
Keep in mind that the Air Suspension Inactive usually means there is a problem with the Air Suspension. However, it will also come up when alternator or battery voltage is low, or when you reset (disconnect and then connect) the battery.
To reset it manually while in Park (P), turn steering wheel all the way left, hold few seconds, and then all the way right, hold few seconds. All the warning lights will go out. Most common failure is the passenger front air strut, since batteries are prone to leaking acid, it leaks right on top of the rubber airbag and burns through it.
Dealer willcharge you one hour to diagnose, or you can easily diagnose this by looking at the ride height of each particular corner of the truck. If its sits low, or emits hissing sound when you park the truck, its leaking. If you keep driving with leaky air strut, you risk burning up the air compressor, as its working extra hard to compensate for the leak.
Posted on Aug 05, 2010
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Posted on Jan 02, 2017
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