EAS pressure switch

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Grrrrrr

Grrrrrr

Technician, Bodgit & Scarper Ltd
Posts
19,898
Location
Buckinghamshire, UK. ('95 DT)
Range Rover P38 1995 DT.

Should the EAS pressure switch trip out the EAS compressor pump before it vents the exhaust valve? I unscrewed the exhaust valve and the pump only seems to stop running after I hear the exhaust valve vent. Surely it should stop before this?

No faults logged according to the Nanocom.

Cheers,

J
 
Grrrrrr said:
Range Rover P38 1995 DT.

Should the EAS pressure switch trip out the EAS compressor pump before it vents the exhaust valve? I unscrewed the exhaust valve and the pump only seems to stop running after I hear the exhaust valve vent. Surely it should stop before this?

No faults logged according to the Nanocom.

Cheers,

J
Click to expand...

Sounds right to me, otherwise exhaust could blow back out through pump, supposing it's only moments you're talking about:)
 
Exhaust can't blow back through compressor. Power to compressor and to diaphragm solenoid valve are cut at the same time.
 
Correct. It pumps until there's a whoosh from the exhaust valve and then it cuts out.

I kind of thought it might stop before the whoosh and the whoosh was like the safety-valve on a steam locomotive, i.e. you've overdone it!
 
Grrrrrr said:
Correct. It pumps until there's a whoosh from the exhaust valve and then it cuts out.

I kind of thought it might stop before the whoosh and the whoosh was like the safety-valve on a steam locomotive, i.e. you've overdone it!
Click to expand...

The same gallery is used to fill the tank as is used to exhaust air from the bags on an height change. Whilst the compressor is running the exhaust is blocked by the diaphragm valve, when the exhaust solenoid valve applies air to below the diaphragm to seal it with pressure. The compressor relay supplies power to both the compressor and the diaphragm solenoid. When the pressure switch trips, the ECU cuts power to the pull side of relay. This switches off compressor and releases diaphragm solenoid. Air holding the diaphragm shut is exhausted via the 4 mm pipe into the wiring loom. Air from the pressurised gallery exhausts past the diaphragm so it can become the exhaust gallery.
 
That makes sense. Thanks.

Another bonus: the missus actually noticed something was different when I took the exhaust filter off. Amazing. I swear she could drive 40 miles with a dead deer carcass dragging under the car and step out onto its bloodied corpse and not notice but she picked up the change in noise. Progress.

Reminds me, better put the filter back.
 
Grrrrrr said:
That makes sense. Thanks.

Another bonus: the missus actually noticed something was different when I took the exhaust filter off. Amazing. I swear she could drive 40 miles with a dead deer carcass dragging under the car and step out onto its bloodied corpse and not notice but she picked up the change in noise. Progress.

Reminds me, better put the missus back.
Click to expand...

Bit harsh:D
 
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