Omega Owners Forum - help - mv6 ecu problems?

buzz

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help - mv6 ecu problems?
01. Oct 2007 at 10:28

I have an ex police mv6. Recently the car cut out, preceeded by most of the warning lights illuminating (batt/ecu/traction/abs/airbag) and the rpm/mph needles falling to zero. There was no throttle response and then eventually cut out. I suspect that the ecu has failed. The ecu is bosch motronic 0 261 204589 gm 90 566 817. Can I buy a secondhand replacement - or is there some immobiliser code/veh specific code? If I can - any suggestions as to the best place to buy? Huh

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Kevin Wood

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Re: help - mv6 ecu problems?
Reply #1 - 01. Oct 2007 at 10:39

I wouldn't be so quick to blame the ECU. They VERY rarely fail.

Crank sensor is probably the most likely culprit for engine just stopping, but check the battery voltage as it sounds like it could have just run out of electrical power due to a charging problem.

If you can get it running, read the fault codes from the ECU and post back. If it won't start with a fully charged a battery, check for fuel and spark and if these aren't there, change the crank sensor.

Kevin

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buzz

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Re: help - mv6 ecu problems?
Reply #2 - 01. Oct 2007 at 11:39

VMT. Couple of bone questions - is the crank sensor easily replaced? How do you check the fault codes. I am currently searching for the answer on the internet - any ideas.

The alternator was replaced about 12 months ago, so I suspect the volts are ok. A day after its initial failure I managed to start the car, but lumbered for a couple of minutes and cut out.

I am in the Odiham area - any (cheap) local specialists

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Entwood Omega King Offline Quietly Confident Posts: 13708 North Wiltshire Gender: Drives: 3.2 Elite (with LPG)	Re: help - mv6 ecu problems? Reply #3 - 01. Oct 2007 at 11:51 Paperclip test is here : http://www.omegaowners.com/forum/YaBB.pl?num=1189022687 you don't say which engine you have so not sure if this applies or you need to plug in to a tech2
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buzz Newbie Offline Posts: 5	Re: help - mv6 ecu problems? Reply #4 - 01. Oct 2007 at 12:06 VMT - very useful - I will crack on!!!
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Marks DTM Calib

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Re: help - mv6 ecu problems?
Reply #5 - 01. Oct 2007 at 12:25

Dont rule out the alternator just because it was changed in the last 12 months....it could be a bog basic re-con one which are not known for their reliability so measure the battery voltage with the engine running.....asuming the engine will start.

I to suspect a failed alternator because there are to many systems simultaneously dying for it to be the engine ECU. e.g.

ABS/Tc ecu
Engine ecu
Instrument ecu
Airbag ecu...

The giveaway is the airbag one because its a stand alone item which takes no inputs from the main ecu.

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Kevin Wood Global Moderator Admin Team Offline Posts: 20377 Alton, Hampshire Gender: Drives: 3.2 MV6 (LPG), Westfield	Re: help - mv6 ecu problems? Reply #6 - 01. Oct 2007 at 12:31 buzz wrote on 01. Oct 2007 at 11:39: I am in the Odiham area - any (cheap) local specialists I live in Four Marks near Alton. I'd be happy to cast an eye over it sometime if you like? Kevin
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Kevin Wood

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Re: help - mv6 ecu problems?
Reply #7 - 01. Oct 2007 at 12:40

In addition, I've seen a few cars where the cable that connects the alternator & starter to the battery terminal has become loose where it's crimped to the battery terminal. A bad connection here would cause loss of electrical power.

First step is to fully charge the battery and see if it starts and runs, then measure the battery voltage with the engine running at a fast idle - see if the battery is being charged.

Kevin

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buzz Newbie Offline Posts: 5	Re: help - mv6 ecu problems? Reply #8 - 01. Oct 2007 at 13:27 Hi all - just did a diagnostic and got 12 - 48 - 31 -12. Thoughts?
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magnul Junior Member Offline Posts: 156 Trondheim, Norway Gender:	Re: help - mv6 ecu problems? Reply #9 - 01. Oct 2007 at 13:35 12 is just for showing that the sequence is initiating/restarting. 31=No engine rpm signal (not necessarily a fault if the engine wasn't running) 48=battery voltage low Sounds like alternator to me, but wait and see what the grown-ups say. -Magnus-
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Marks DTM Calib Administrator Offline Ex Member Posts: 25671 Northern Hemisphere Gender: Drives: Astra J, Mum Bus, Dexta Tractor, 108 DMU wip	Re: help - mv6 ecu problems? Reply #10 - 01. Oct 2007 at 13:43 Yup....48 is the key....31 is standard with the engine not running and 12 is start and end of code cycle indicator.
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buzz Newbie Offline Posts: 5	Re: help - mv6 ecu problems? Reply #11 - 01. Oct 2007 at 20:27 TVM I have jump started the car and ran for a few minutes with the ign/charge light glowing. I will now charge the battery and start searching for a new alternator!! (Did'nt get much life out of the last one!!) Any top tips on the best source of reconditioned units??
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