Quote:
Originally Posted by LVR
Hi
ISTA is the newer version of INPA (as I understand it). I use it to remove errors and reset EHCII module which is what controls the system. It allows diagnosis and test programmes etc.
I highly recommend it.
From those pics the first thing that stands out is that you have the same issue I did, which is a plausibility error on your front left sensor. If you look at the voltages on all of your other sensors, you'll see that they are within a similar range, except for that one.
If you use INPA, look at the Offset Values from the ECU screen. In my case the offset value was -5145 whilst the other wheels were all around 400 - 450.
The sensors when operating correctly put out a voltage depending on where the arm is (ie ride height). When you are setting the ride height you are telling the system which voltage you want and it goes to that point.
It has a limited range and the sensors are also prone to being knocked out of place or water ingress messing them up.
This is how I found my sensor
You can see the arm pointing down.
It should be like this
If it is in the right location I would be starting by replacing the sensor. They're pretty cheap and easy to install.
Then reset the ride heights etc.
If that doesn't work then I used a combo of INPA and ISTA to re-write the error in the sensor range to get it back. |
Thanks for this, I have checked the sensors and both front sensors are in the correct location, the front left was replaced a few months ago (aftermarket) as I thought this was the root cause of the problem but it didn't change the implausibility error I was getting at the time. I was still able to adjust the ride height using the laptop though.
Then I found the right rear sensor was seized so I replaced that, first with an aftermarket one but I found the bolt pattern was not the same as the one I removed. I fitted it anyway while the new one was on order from BMW and then I replaced the new aftermarket one with a new genuine BMW one, but this didn't clear the error - annoyingly I can't remember if I got a different error after this. At this point I was still able to adjust the suspension using the laptop.
The a few weeks later the car dropped to the ground and I got the ehc74 error.
The LPG tank is now out and I have bitten the bullet and booked it into a specialist on Tuesday as I am flummoxed! I will have another look this weekend but I don't really know where to look next. I will check the battery compartment and probably remove the side trim to see where the cabling and air pipe goes but I don't really know what I am looking at.
Will keep you updated and will post with the diagnosis from the garage.
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Current Transport:
2005 BMW X5 4.8is (LPG)
2000 Saab 95 Aero HOT (chipped to 275bhp)
1995 Audi 80 Cabriolet
London Underground
Previously Owned:
Mercedes ML55 AMG (LPG), BMW 540i Touring, BMW 535is, Mercedes CLK 200, Toyota Celica, Honda Prelude, Mercedes 190e, Ford Sierra / Escort / Fiesta, Vauxhall Nova, Rover 214sei, Golf Mk1, Mazda Bongo
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