P38A More EAS diagnostic help needed

300bhp/ton said:

To follow up from my previous thread.

I’ve managed to figure a few things out on my 99 4.6 EAS issue.

- The compressor is working. Just couldn’t hear it over the exhaust. Have the cover off the EAS box under the bonnet and can confirm the compressor is working as normal.

- I can trigger the compressor by removing the RL20 relay and jumping the connectors also. But it kicks in fine as normal when you start the engine.

- Have used a multi meter to check the thermal switch which seems fine.

- I’ve bought some valves and manually inflated each air bag by removing the lines from the valve block. They all inflate and aren’t the problem.

This leads me to think the problem is not the air springs or pump. But I’m unsure how or what to check next.

I wonder if the diaphragm valve isn’t working correctly. Or if there is an air leak on the tank or the dryer.

I’m getting no fault codes at all. But when all connected the car just sits on the bump stops and doesn’t move even a mm.

Meaning that while the compressor is pumping air in. It isn’t reaching any of the air bags.

What should I check next?

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kurtjohnson10 said:

Diaphragm split in the valve block?

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300bhp/ton said:

Is there an easy way to check this? Not sure if there is a sticky or not. Ta.

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300bhp/ton said:

Is there an easy way to check this? Not sure if there is a sticky or not. Ta.

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kurtjohnson10 said:

dont let the compressor run too long whilst you have a suspected leak you will burn it out pretty quick

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Saint.V8 said:

You say the compressor runs - have you actually checked it generates pressure?

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300bhp/ton said:

No I haven’t. What would be a good way to test this?

I was thinking of fitting a valve to the line to the air tank to check that the tank holds pressure (it looks really corroded under the Vehcile).

And I guess I could do similar and use my tyre compressor in place of the vehicle one on the valve block.

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Grrrrrr said:

Good colour choice. ;-)

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300bhp/ton said:

Is there an easy way to check this? Not sure if there is a sticky or not. Ta.

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wammers said:

Question i am asking myself is why did i write a long drawn out explanation of how to check EAS in tech archive.

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300bhp/ton said:

Do have a link please? Have found one. Which I used to check the thermal switch. But it didn’t specially answer my questions. Thanks.

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DanClarke said:

+1 Wot he said. nice colour.

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wammers said:

Same colour as mine. But mine has proper wheels on it, no side steps and most importantly a diesel engine. So it's betterer.

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wammers said:

Same colour as mine. But mine has proper wheels on it, no side steps but a stair lift and most importantly a diesel engine. So it's betterer.

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Edited for accuracy, same as mine.​

300bhp/ton said:

I have more wheels. And steps have been on it since before I owned it.

A manual diesel does sometimes seem appealing for the mpg. But the 4.6 is a lot quicker.

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