EWS-II fault... Urgent assistance please!

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  1. EWS-II fault... Urgent assistance please! 
    #1
    Omi
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    Hi folks, going to put as much detail as I can in here and hope someone can help. - Already posted on E36Coupe, but they're an unhelpful buch of... Erm. Hi!

    Fitted M52B28 into my E30 a few months ago. Yes, it goes like a cat with 2 rockets up it's bum...

    Donor car was crash damaged and had sat for some time with battery disconnected. - Started fine when reconnected. 2nd time we tried to start it, ignition position 3 (crank) didn't do anything. Locked it all back up, retried. Started fine, thought nothing else of it. - Seller said it was the first time this had happened.

    Whole assembly was removed, rewired and reinstalled in the E30. Started 1st time, and was all beautiful.

    A few starts later, I got the same failure to respond. Left it a while, retried, all was fine. - Another time I'd turn to Pos3 to crank and nothing would happen for 1/2 a second, up to 5 seconds when it would suddenly decide it was happy and start turning over. The car would intermittently fail to start maybe every 4th attempt.

    A month ago the EWS decided it was no longer happy at all... No amount of waiting or retrying would give the characteristic relay click from the EWS module, signalling that the starter would engage and the DME was happy to run.

    I swapped out antenna ring, send/receive module and went through all the wiring very carefully and methodically. All was fine. - Went to BMW, spoke to a technician and he said it was likely to be a broken down transponder chip and that I should replace the key... Another key was ordered, arrived and started the car on the first attempt, every attempt.

    Until about 4 days later, when the same non-start occurred. Waited, was fine.

    Over the last few weeks the same degraded service from the key has been experienced. Exactly like before... This morning I drove to work, an hour later I drove to get some breakfast... Got back in the car with breakfast and failed to start. Have checked wiring again, even tried the old transponder chip. Nothing.

    I'm quite familiar with the electronics (having done the swap and wired in the EWS) and the problem is definately not with the starter motor, crank position sensor etc., as I've seen mentioned in similar threads.

    When the EWS accepts the key as valid it confirms ISN with the DME and enables injection and ignition in the DME. It also completes the starter circuit, which comprises the audible relay click. As I'm not getting the click, it's pointless searching for faults any further than the EWS-II system.

    It's really odd that this has occurred with subsequent keys in exactly the same way over roughly the same time period/number of starts. I seem to recall there are 10,000 rolling code combinations, but is there anything that might run out of combinations after 50-100 vehicle starts? Nothing changed between starting the car successfully and total EWS lockdown on both occasions.

    Does anyone understand exactly what an EWS alignment does, have access to GT1/DIS, or have any further information on EWS-II that might account for something I'm missing? Can the code tumblers be reset, or can CarSoft 6.5 align/read key whitelist etc.?

    Huge thanks in advance!

    Omi

    p.s. - Jan '96 built 328i Sport (manual) if req.
    Last edited by Omi; 08-09-2008 at 15:23. Reason: Correcting Speeling.
     
     

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    Hi and welcome to the forum, this is going to be a tricky one!

    First off have a read here http://www.europeantransmissions.com...0EWS%20BMW.pdf.

    page 10 and 11 may be relevant to your problem
     
     

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    #3
    Omi
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    Already scoured that document... - Noted the sequence on Pg12-13 and compared to a post somewhere else on here by another Mod saying EWS could be bypassed. Can't see how unless you can configure the EWS Module to send the ISN every time it's powered on... Would be interesting to hear his thoughts on this, as if he knows the module that well he may be able to tell me what's going on here.

    BMW won't touch the car, as it's an abomination to them! Local Indy wants £70 an hour and I didn't get the impression he'd have a clue where to start.

    Wish you could write to proper BMW engineers asking them how their designs work and get diagnostic advice! - Can't buy a DIS to solve it. :P
     
     

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    Omi
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    Further Info...

    -- -- -- -- -- -- -- -- -- --

    Black/Yellow was already snipped from a previous alarm, so I wired the starter inhibitor relay in. - I bypassed it last month when it failed and it would crank forever, but EWS wasn't accepting the key so was pointless. - Didn't need to reset anything when the key was replaced, just fired immediately, exactly as it should.

    It seems like the key is sometimes misread and has eventually been misread enough for the code to be right out of the list of recently acceptable codes... Like the EEPROM in the key isn't getting the new Rolling code.

    Is that right? - EWS keeps a list of valid recent codes and the 10 new key codes. If mine wasn't writing the new codes back to the transponder chip it would eventually drop off the list?

    -- -- -- -- -- -- -- -- -- --

    Local Indy Specialist didn't inspire a lot of confidence. He didn't quite grasp the swap I'd done and didn't think the OBD2 port would work. - Wanted £40 to try and read the codes and it would mean dragging the car 10 miles to him. - £70 per hour plus parts when he doesn't know what's wrong isn't good for me.

    I've bought CarSoft, is on a slowboat from China for £35. Local auto locksmith who has worked with BMWs before with a transponder sensor will tell me whether the antenna ring is broadcasting the 125KHz AM induction frequency.

    I'm wondering if there's a bad signal that EWS is deciding "eventually" (maybe after 50 starts) that it doesn't like, and locking down the key. The list of 10 key-codes in the EWS system can go into a BlackList if lost, stolen, tampered...

    BMW won't give me the time of day because it's an abomination in their eyes, so I can't get them to check this list. Few folks in BMW dealerships have been asking their techs, but so far no-one's really come back and said "Yes, I've had that before, it's because this piece has a fault."

    For the £100 BMW would charge, I can buy a new Antenna loop, pay for the CarSoft and possibly even an EWS module, if CarSoft will really do the realign. Already have a send/receive unit spare (thanks Ian) - I can read the OBD2 errors, sort any of those that are detailed.

    If at that stage it doesn't work, I've got no choice but to buy another key and hope the bits I've swapped out have solved whatever has caused this on the last 2 keys... - The fact that the first time it ever did the intermittent non-start was when still in the complete donor car after the battery had been off for a month or so makes me wonder what that Live feed on the EWS is for.

    Any further thoughts or ideas, folks?
     
     

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    #5
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    you could get a second hand ecu,ews,key and transponder combo from somebody breaking that model
    they normaly do get sold as a set
     
     

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