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Vito 115CDI Won't Crank/Start - ECU fault? - Please advise..

 
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PostPosted: Sun Jun 17, 2012 10:09 pm    Post subject: Vito 115CDI Won't Crank/Start - ECU fault? - Please advise.. Reply with quote

Hi All,

I'm having an issue with a Vito 115 CDI (VIN: WDF63960323176835).

What happens is the Vito starts up only when left in the sun for a couple of hours. It takes about 10 minutes to start when the ECU is slid out & placed in the sun, I hope i'm wrong but I did try this a few times!

Below I have listed the faults that come up on my scan tool:

- 5501 - CAN Communication is faulty
- EZS - Electronic ignition switch
- P2364 - Engine Control Module - Internal Malfunction
- B1101 N30/4 (Electronic Stability Program(ESP)):Fault or defect in CAN Communication
- B1102 - N3/20 (Common rail (CDI)):Fault or defect in CAN Communication
- B1105 - Interior CAN bus: CAN bus OFF


The frustrating thing is that these errors disappear (without deleting them with the scan tool) when the ECU has 'warmed-up' in the sun, it starts and drives as it should, but if it's left to cool off, the engine doesn't even turn over if you attempt a start.

Have any of you come across this issue before or have some possible advice? I have sent the ECU to be looked at by 'ECU repair specialists' just for confirmation.

Many thanks in advance for all your replies!
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PostPosted: Mon Jun 18, 2012 3:48 am    Post subject: vito no start Reply with quote

Cool   looks like you have codes to support your theroy. I was wondering what your scantool data looked like when it was not starting? I have never worked on that type of car,but do know alot about feul injection and most ecu"s.  If you do not have any scantool data streem until the computer is warmed up, I would think you have found your problem.
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PostPosted: Mon Jun 18, 2012 7:24 am    Post subject: Reply with quote

Does sound very much like a faulty ecu, did you try heating and cooling it?

I.e warming it up with a hot air gun and once it starts cool it down with brake cleaner etc and see what happens.

Sounds like your on the right track anyway, do let us know what was internally wrong with the ecu if it is the ecu if you find out.

Andy
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PostPosted: Mon Jun 18, 2012 10:47 am    Post subject: Reply with quote

Scope the CAN Bus lines from the ECU. Check the signal levels / amount of CAN data flowing. Compare when its not starting / starting. Open ECU and check for a bit of green death in there. Sounds like water ingress. If it starts when its hot then ECU shouldn't be that bad, clean and resolder bad bits.
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PostPosted: Mon Jun 18, 2012 6:28 pm    Post subject: Reply with quote

i would tend to agree with timstewart

sounds like water has got into the unit

can you open the case and see/dry it out
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PostPosted: Tue Jun 19, 2012 9:33 pm    Post subject: Reply with quote

Thanks for all your replies!

The ECU is on it's way back from an ECU testing centre, apparently they aren't able to find anything wrong with it (visibly and when plugged in), but they were only able to check one side of the board as it's glued in to the point  that the 'PCB will break' if removed. Once I get it back, I will run some tests on the CAN system as suggested, I will keep you all updated.

Thanks again!
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PostPosted: Wed Jun 20, 2012 8:44 am    Post subject: Reply with quote

A quick update, I plugged the ECU back in and the same faults were there. Now, I ran through all the tests I possibly could and I am unable to connect to the CGW-Central Gateway which from my knowledge is one of the modules that controls the CAN Bus system.

Has anyone here dealt with this before?
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PostPosted: Wed Jun 20, 2012 10:38 am    Post subject: Reply with quote

.:TIT:.:1327 wrote:
A quick update, I plugged the ECU back in and the same faults were there. Now, I ran through all the tests I possibly could and I am unable to connect to the CGW-Central Gateway which from my knowledge is one of the modules that controls the CAN Bus system.

Has anyone here dealt with this before?


Most cars have a CAN bus system like a ring main sort of thing. Each module is connected to a two wire ring that goes to every other module. Some have two totally separate CAN bus's (like transits, one for engine and one for diag and body stuff). My understanding is that the Mercs have 2 or 3 different CAN bus's (engine / body / diag) and instead of being totally separate these bus's data can be fed from one bus to another via the gateway. A bit like the PSA stuff where the BSI acts as a hub and the VAN bus modules all go through the BSI to communicate with each other. Can anyone elaborate further?
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PostPosted: Mon Jun 25, 2012 8:34 pm    Post subject: Reply with quote

Hi All,

Another update...

I managed to get the Vito started today and drove about 40km to the only people in the country who have a genuine Star Diagnostics kit. They checked the vehicle over while I watched. The Vito was starting after one or two tries after the trip (a few times even straight away), that really annoyed me! But the longer they took to look at it, the less it wanted to start. They weren't able to update firmware on the ECU as the Benz server in Germany was having issues. There is also a possibility that there is something draining the battery, and the issues may have come from this, so the aftermarket radio was removed, there is also a possibility that the vehicle has a tracking system (owner unable to confirm as the Vito is second hand). The chap who looked at the Vito said he would put his money on either the ECU being faulty, CAN fault somewhere (anywhere in the vehicle's wiring), or some work that had been previously done (possibly the tracker?!).

Anyways, I drove the 40km back and once parked for a while I tried starting the Vito 5 times, no issues what so ever....I'm at a loss...

I was really considering buying a Vito for myself, but after this headache, I'm getting something else...
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PostPosted: Sat Oct 13, 2012 6:58 pm    Post subject: Reply with quote

Job done! Used ECU ordered and copied data from one and transferred it to the other. Runs like new again...



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