EAS pressure switch error

DesertRanger · Aug 10, 2014

Hi, recently I've replaced the entire EAS distribution block, including the compressor with a second hand unit purchased in the USA. I've cleaned the airways, replaced all o-rings, and installed it without previously testing all components, except for the conduction of each solenoid. For a week things worked like a charm, surprising me with a swift response of the system when going between each state of height level. At some point, while parked I've noticed the car sitting on the bumps, as if all air escaped from the system. After starting and waiting about 4 minutes, the system reached the urban cruise level and things seemed normal again. However, today after driving for 30 minutes and parking the level went down to the bump stops again and could not reach any other level. After waiting roughly 10 min the EAS went into error mode and the error reported was "Pressure switch always open". I've pulled the unit out and checked its DC resistance. I got 20Mohm, open circuit basically.
When applying a small pressure from a bike pump I got no state change.
Does anyone know how can the normal operation of the pressure sensor/switch be measured with a multimeter?
Thanks in advance.

Grrrrrr · Aug 10, 2014

Wouldn't expect the pressure switch to be open more than about 30% of the time. I'm no expert but I suspect either the switch is duff or there's a leak somewhere.

New switches aren't expensive.

wammers · Aug 10, 2014

DesertRanger said:
Hi, recently I've replaced the entire EAS distribution block, including the compressor with a second hand unit purchased in the USA. I've cleaned the airways, replaced all o-rings, and installed it without previously testing all components, except for the conduction of each solenoid. For a week things worked like a charm, surprising me with a swift response of the system when going between each state of height level. At some point, while parked I've noticed the car sitting on the bumps, as if all air escaped from the system. After starting and waiting about 4 minutes, the system reached the urban cruise level and things seemed normal again. However, today after driving for 30 minutes and parking the level went down to the bump stops again and could not reach any other level. After waiting roughly 10 min the EAS went into error mode and the error reported was "Pressure switch always open". I've pulled the unit out and checked its DC resistance. I got 20Mohm, open circuit basically.
When applying a small pressure from a bike pump I got no state change.
Does anyone know how can the normal operation of the pressure sensor/switch be measured with a multimeter?
Thanks in advance.

Your compressor is knackered you have a leak. Pressure switch is open circuit until 140 +- 7 PSI is applied to it then it should go closed circuit.

Grrrrrr · Aug 10, 2014

If you check the How To section, Wammers has done the definitive guide on checking your EAS including checking if the compressor needs overhauling. Good starting point. ;-)

DesertRanger · Aug 12, 2014

Thanks a lot for all answers. Indeed, the rear left valve was bleeding. Soapy water bubbles formed quickly at the base of the solenoid cover. I changed the O-rings, replaced the flat head machine screws and now things are tight. The compressor starts every 90 seconds or so after switching from highway to urban driving height. Eventually stops but it seems still as if something else might be leaking. I pulled out the delay relay switch out for the night and see in the morning what the status is.

EAS pressure switch error

DesertRanger

New Member

Grrrrrr

Technician, Bodgit & Scarper Ltd

wammers

No longer with us, RIP

Grrrrrr

Technician, Bodgit & Scarper Ltd

DesertRanger

New Member

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