L322 L322 EAS (second-hand) ECU Replacement ?

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SortedHSE

Member
Posts
35
Location
Scotland
Background:

2004 L322 TD6 HSE AUTO developed EAS fault.

Air suspension inactive, Max 35MPH on dash, EAS led went out and stayed out.

Codes stored for RHF height sensor fault & LHR height sensor fault. Tried clearing those but they were reoccurring. Called out the AA. Patrolman checked EAS fuses, they were all okay. He found same fault codes and they wouldn’t clear. Car was then dropped off at my local(ish) independent LR garage.

They found the same faults. They tried a test height sensor and the faults remained. They then suspected wiring fault and checked that. They couldn’t find any wiring fault. They then tried replacing the sensors on a sale or return basis. RHF fault cleared and stayed clear, LHR fault remained.

They then used a test wiring loom and wired the LHR sensor directly to the EAS ECU and the fault remains. They say this and other tests they’ve carried out points to the ECU being faulty and requires replacement.

I have AA breakdown repair insurance. The AA say they will cover the cost of a second-hand EAS ECU. The Indy has come back to me and said that they can’t be sure a S/H ECU will work due to coding. The only way to be sure is to buy new and that’s about £550 inc. VAT.

I’ve had a dig around and from what I can find what the Indy says is correct. Some say a S/H ECU will work others say it won’t and it needs to be new.

Question is, has anyone any experience of replacing the EAS ECU with a second-hand unit, can it be reset and recalibrated to my/another vehicle?

I’ve also found a new, old stock ECU which I’ve passed onto the Indy which is more expensive than a second-hand part, but half the cost of a brand new part.

I’ve also found this service bulletin on the EAS ECU which I’ve passed to the Indy in the hope it helps? They’re really very good, honest folk who know LR’s inside out. They’ve not come across this fault before so no direct experience of swapping out the ECUs.

http://rangerover.x10host.com/l322/tb/LM204-001 EAS ECU Incorrect Diagnosis.pdf

More. Both front airstruts were replaced in Oct 2019 due to leaks. Indy reported at the time that the EAS wouldn't run through the full calibration setup despite them trying to get it to 2 or three times. It was within tolerance though and was working fine so they left it at that. I wonder if this was a sign that all was not right with the EAS ECU then?

Many thanks in advance. John.
 
Welcome.
I'm not one of the Gurus, apprentice gurus , or sven clever about these things, if I'm honest. However I'll start with the basics : What are /were the codes? Has a hard reset been tried? Has anyone mentioned a thing called an RLM ( bring @Saint.V8 in on this as he is a Guru)
Back on to EAS ECU at signal already lit but will shine it wider @Henry_b @kds @biketeacherdave @holidaychicken and others
 
Thanks @gold rover. I don't have the codes, just that they pointed to faults with RHF & LHR height sensors. The RHF cleared with a new sensor, LHR remains. Unsure if a hard reset? has been tried and never heard of an RLM.
 

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The obvious thing is to read the live data from the sensors and see what's happening.
If the live data changes when the wheel moves it's unlikely to be the ecu.
Also, your AA "warranty" should cover new parts. It's ludicrous saying they will pay for s/h parts.
 
Well ......in the 1st instance I dont think its your ecu.

If they have replaced height sensors they need recalibrating and all hard faults cleared.
You do not mention this in your post. What diag is your garage using ?? Most generic diag wont clear hard faults or calibrate sensors.

Bit more info will help us help you
 
The obvious thing is to read the live data from the sensors and see what's happening.
If the live data changes when the wheel moves it's unlikely to be the ecu.
Also, your AA "warranty" should cover new parts. It's ludicrous saying they will pay for s/h parts.
Good old EU law says that secondhand parts must be used where available:rolleyes:
 
As Wazzajnr said, the garage should be looking at live data from the sensors. IMO it's unlikely to be the ECU, corroded connectors maybe. There is no guarantee that the garages's attempt at direct wiring the sensor was done correctly.
 
Well ......in the 1st instance I dont think its your ecu.

If they have replaced height sensors they need recalibrating and all hard faults cleared.
You do not mention this in your post. What diag is your garage using ?? Most generic diag wont clear hard faults or calibrate sensors.

Bit more info will help us help you

Thanks. Garage in question is LR Indy using professional diag. They cleared the faults, but can't clear the remaining LHR fault even with a new sensor fitted. They then wired up the LHR sensor directly to the ECU and the fault/air suspension fault on the dash remains. Which as they state rules out a wiring loom fault on the car and points the finger of blame at the ECU?
 
Thanks. Garage in question is LR Indy using professional diag. They cleared the faults, but can't clear the remaining LHR fault even with a new sensor fitted. They then wired up the LHR sensor directly to the ECU and the fault/air suspension fault on the dash remains. Which as they state rules out a wiring loom fault on the car and points the finger of blame at the ECU?
There are a lot of things on the L322 that can cause the air suspension to be inactive including low battery volts. I repeat, they need to look at live data for the sensors. Many professional garage diagnostics do not work correctly with the L322.
 
@SortedHSE as stated, I'm not clever like @Wazzajnr , etc. So time for me to sit back, learn, and watch your journey. In the hope the clever types have an answer. Good luck getting Ronnie sorted :D
I'm far from clever!
However, ecu's fail relatively rarely and it's normally corrosion on pins or total failure.
The fact that they've been able to clear 1 code and the ecu has then logged the 2nd code again suggests that the ecu is doing its tests so is operational.
The logical thing to do then is look at the live values and see what they are and if they change.
 
Hello mate. I confess my first thought on this was EAS contacts rather than the EAS itself, but if they were getting odd data from it when they replaced the airbags then maybe it is on its way out.
It seems reasonable that a replacement unit will need coding to the car, but I am not clear why this might only be possible with a new one. The only time I have heard of this was when Volvo wanted £1200 to supply, fit and code a new infotainment module to my V70. I could buy and fit a secondhand one myself for £50, but it needed a Volvo dealer to code it and they would only do it with a new one they had supplied themselves. This is ironically an anti-theft measure.
If your guys can code it then I would try a secondhand one.
 
Hello mate. I confess my first thought on this was EAS contacts rather than the EAS itself, but if they were getting odd data from it when they replaced the airbags then maybe it is on its way out.
It seems reasonable that a replacement unit will need coding to the car, but I am not clear why this might only be possible with a new one. The only time I have heard of this was when Volvo wanted £1200 to supply, fit and code a new infotainment module to my V70. I could buy and fit a secondhand one myself for £50, but it needed a Volvo dealer to code it and they would only do it with a new one they had supplied themselves. This is ironically an anti-theft measure.
If your guys can code it then I would try a secondhand one.

Cheers, mucker. Just spoke with Scott. He's read through the LR service bulletin that I sent him and is now going to work through that to double check he hasn't missed anything before committing to a replacement ECU. The last thing either of us want is to replace the ECU and the fault remains.... That would be a total ball ache and a waste of his time and my money.

http://rangerover.x10host.com/l322/tb/LM204-001 EAS ECU Incorrect Diagnosis.pdf

Hopefully it's a bad earth etc. and this can be found and sorted.

Thanks for all the replies folks.
 
Just a thought , tangent to the thread. As you seem to have a decent LR indy, that you seem to trust. Any chance of sharing them? It is always handy to know of another decent Indy.
 
Just a thought , tangent to the thread. As you seem to have a decent LR indy, that you seem to trust. Any chance of sharing them? It is always handy to know of another decent Indy.

Yeah, happy to share their details. Will wait until the car is sorted and back and do that in a seperate post. Cheers.
 
(I see he found my list of Tech Bulletins I saved from Topix a while ago and stored on my xhost site....hee hee :D:D:D:D:D )

I am not sure, but if the replacement s/h ecu is from the same model (i.e. Petrol or Diesel, same year etc) the only thing is should need is the ride heights calibrating....the EAS ECU knows nothing else other than it is an EAS ECU and it has to open and close valves and tell the compressor relay to turn on or off....then tell the ABS ECU what the current ride heights are etc.....it stores no other vehicle information like security codes, mileage, VIN etc as far as I know.

Unlike the LCM or IKE which is very much vehicle specific.

I stand ready to be corrected though!
 
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