L322 When should the EAS compressor run?

simple as the title. L322, when should the compressor kick in?

Mine currently kicks in for a few seconds when the ignition is turned on. No engine running, just ignition on. Is that correct or should it not kick in until engine is running. It runs for these few seconds. I’m still trying to sort my EAS inactive problems and am slowly thinking it’s either a goosed ECU or damaged wiring

it could be the middle block next to the compressor thats no good.its normal fo it to come on for a few seconds to top up the pressure in the res


. if you change an ECU YOU WILL NEED IT PROGRAMMING TO THE THE CAR

What do you mean the

philip pickard said:

it could be the middle block next to the compressor thats no good.its normal fo it to come on for a few seconds to top up the pressure in the res


. if you change an ECU YOU WILL NEED IT PROGRAMMING TO THE THE CAR

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middle block?

there is an air block { splitter} that divides air to front bags and back bags if its got any old powder from the compressor stuck in it or its valves are worn. then it stops working. causing codes to come up.

philip pickard said:

there is an air block { splitter} that divides air to front bags and back bags if its got any old powder from the compressor stuck in it or its valves are worn. then it stops working. causing codes to come up.

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I can’t access the ECU to find out what the codes are. The only code I have to work with is air suspension can error which was in the abs module

you need to get it on a diagnostics that show you. else you will be changing things that are not broken.

philip pickard said:

you need to get it on a diagnostics that show you. else you will be changing things that are not broken.

Click to expand...

I don’t think you quite get what I’m on about. I’ve been on several diagnostics, both land rover specialist and my own Snap On Verus plus another. None can talk to the EAS ECU. All come up with communication errors. Either the can bus has a broken wire or my EAS ECU is faulty. I’ve now tried disconnecting ECU’s like the ABS and Headlight Levelling and still can’t access the EAS ECU.

Some light bed time reading....

Goesthrough how the CAN works and diagnosing it....

Yours probs has had the headlamp leveling ecu removed as they are a common cause of CAN issues.

The Valve Block for the EAS is mounted to the airtank under the drivers door sill.....

I would think an ECU on the CAN is blocking the transmission of data....if one fails it drags the entire CAN down with it.

Saint.V8 said:

Some light bed time reading....

Goesthrough how the CAN works and diagnosing it....

Yours probs has had the headlamp leveling ecu removed as they are a common cause of CAN issues.

The Valve Block for the EAS is mounted to the airtank under the drivers door sill.....

I would think an ECU on the CAN is blocking the transmission of data....if one fails it drags the entire CAN down with it.

Click to expand...

Would that stop me reading other ECU’s? I can access the ABS, SAS etc. I have noted in the wiring diagrams that the ABS and instrument cluster have both can bus wires labelled x18835 and x18836, the EAS ECU however is labelled x18826 and x18827. How is the CAN bus wired? I have a second hand EAS ECU arriving tomorrow.

I’ve tried unplugging the headlight levelling module and it had no effect. The wiring diagram only shows the headlight levelling module connected to the k bus though. Not the can bus. So would that still pull the can bus down?

Saint.V8 said:

Some light bed time reading....

Goesthrough how the CAN works and diagnosing it....

Yours probs has had the headlamp leveling ecu removed as they are a common cause of CAN issues.

The Valve Block for the EAS is mounted to the airtank under the drivers door sill.....

I would think an ECU on the CAN is blocking the transmission of data....if one fails it drags the entire CAN down with it.

Click to expand...

Interesting read.

I also found a LR tech bulletin which went through testingthe supply to the EAS ECU and the can bus wires to the instrument pack, thenthe instrument pack to the OBD port. All checked out fine. The last step was if it checked out fine to replace the speedo (if it tested faulty!) which I have a tested one coming tomorrow. As far as I can make out. The EAS talks to the ABS which talks to the speedo? Am I right? This came from reading the LR electronic Libary.

“K Line Bus
The following are connected to the diagnostic socket (C0040) via the K Line Bus on WP wires:
Transfer box ECU (C1319).
ABS ECU (C0506).
LH Xenon Lamp ECU (C0009).
RH Xenon Lamp ECU (C0011).
Steering angle sensor (C0862).
Instrument pack (C0233).”

Now I can talk to the transfer box as I found some codes in there. I can also talk to the ABS module. So I’m starting to pull my hair out. If the K Line was down and defunct, surely I wouldn’t be able to?

Update, replacement instrument cluster didnt solve it. Now ABS ECU is winging its way here for delivery tomorrow. Will try that. If that doesnt fix it, the centre console is coming out to find the Airbag ECU as thats the other one i cant communicate with!

You are on the slippery slope to replace. Thinking that’s gonna finally fix it after you have emptied your wallet.

Suggest you take a breath

I am sorry but I don’t know the answer and know nothing about “k”line bus (I only ever caught the 66 red one)

But somebody knows here how to walk you through, think I read somewhere unplug all and work back to find the issue. (Not sure)

Do you have a manual?

I know it’s not much help but you seem to be running around in a china shop, and maybe just need to slow down a bit

J

marjon said:

You are on the slippery slope to replace. Thinking that’s gonna finally fix it after you have emptied your wallet.

Suggest you take a breath

I am sorry but I don’t know the answer and know nothing about “k”line bus (I only ever caught the 66 red one)

But somebody knows here how to walk you through, think I read somewhere unplug all and work back to find the issue. (Not sure)

Do you have a manual?

I know it’s not much help but you seem to be running around in a china shop, and maybe just need to slow down a bit

J

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All the parts are coming from a breakers and are being returned if they don’t fix it. We have an agreement

I have been through every thread on here, tried everything people have done before including unplugging various ECU’s & components. Nothing is working so replacing the ABS ECU is the next logical step to do followed by the airbag module. The Air Suspension, ABS and Airbag both use k line. I can only access the abs out of the three.

Oh and yes, I have the electrical library book and the electrical wiring diagram book too.

Hi

Hope u didn’t mind me saying and understand with faults it can feel like ur pulling ur hair out,

If ur replacing items with second hand parts there’s no 100% guarantee that there not faulty as well

When you’ve cleared all the faults what ones if any have come back please with the code numbers

Also this may sound daft , have u checked to ensure all ur lights, inc brake lights work ok , is battery also giving out a good bolt reading

Understand as I’ve got a D3 and even a blown bulb can cause all sorts of issues

If I may say the members here are extremely knowledgeable, think as a base line need to establish

1) all lights work, inc brake lights
2) battery voltage is ok with the engine off and then engine running
3) earth battery cables are clean on post and body
4 ) EAS ecu has no missing or dirty pins

Hopefully it’s something simple , but also if I may say replacing parts with second hand parts u might start opening a large can of worms , especially if the software gets corrupted ur end up with a non starting motor

Got some ecu info sheets somewhere , will try and find them for u

Lastly , we all understand how frustrating it can be

@t20bigjim

Don’t know if you’ve seen this , hopefully might help u in a small way

https://blackbox-solutions.com/help/SM131.html

Another link

https://www.rangerovers.net/rrmkiiiremedies.html#brakeswitch

Thanks. That link deals with post 2005 L322’s and mine is an 02.

I have the parts coming from a trader in Somerset who specialist in range rovers. They have assured me that the parts are perfectly functional. They also had this problem and was caused by the loom to the airbag ECU being crushed. I have yet to get my centre console out to check it. I’ve found two people having the fault which was caused by the ABS ECU hence I’m now changing mine. If it doesn’t fix it, I will remove the centre console test the wiring and also try with the module disconnected.

t20bigjim said:

Thanks. That link deals with post 2005 L322’s and mine is an 02.

I have the parts coming from a trader in Somerset who specialist in range rovers. They have assured me that the parts are perfectly functional. They also had this problem and was caused by the loom to the airbag ECU being crushed. I have yet to get my centre console out to check it. I’ve found two people having the fault which was caused by the ABS ECU hence I’m now changing mine. If it doesn’t fix it, I will remove the centre console test the wiring and also try with the module disconnected.

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Swapping parts or leaving things disconnected is not a good strategy on the L322 because so many ECU's are interconnected. Designed by the Marx brothers