MK2 ECU

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MK2 ECU

Postby rell_001 » Mon Jun 29, 2015 8:12 pm

Hi. New member.
(Edit: obviously I've put this post in the wrong place. Sorry. )
My MX5, 1.6, MK2, 2000 reg has been left out over winter.
Started and ran well for first 100 miles or so in May. Then conked out at traffic lights in ABZ.
Got it started again but misbehaves at idle and feels rough.
Following some reading of this forum I lifted the passenger carpet. I have a flooded passenger footwell and a badly corroded ECU coverplate.
Removed the plate and the ECU also shows signs of corrosion. Removed the connectors and discovered one pin has corroded and broken in the plug.
Removed the ECU. Its a B6ML.

I'm going to dry it out and I can probably get a jumper lead to replace the broken pin but this might not work.
Can anyone kindly suggest where I might source a working replacement ECU? Do I need to use exactly the same model number?
Do I need to also replace other parts (immobiliser, locks, keys etc) or will the old ones still work if I change the ECU?

Don't want to miss the Aberdeenshire summer :-)
Thanks in advance
R
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Re: MK2 ECU

Postby drumtochty » Mon Jun 29, 2015 9:00 pm

Yes it is a pain.

You need the ECU with the same number, the matching Lucas immobiliser box and the matching key.

So try and get the ecu repaired and get those cabin drains cleared.

Check the charging voltage if it starts as it may be up at 19 volts as the ECU on the Mk2 has the voltage regulator in it.

It should be nearer 14 to 15 volts.

If you are not up to spec on electrics etc and it starts bring it out to Drumtochty at the weekend if you want a second opinion.

PM me a phone number if you want to talk as this is not a change you realy want to make.
Last edited by drumtochty on Mon Jun 29, 2015 10:13 pm, edited 1 time in total.
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Re: MK2 ECU

Postby drumtochty » Mon Jun 29, 2015 9:29 pm

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Re: MK2 ECU

Postby sclements » Mon Jun 29, 2015 10:23 pm

I have a B6MV ecu along with the immobiliser, inductor ring, ignition lock, door locks, boot lock and 2 keys - £100

However can't advise if it is a suitable alternative.

Scott
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Re: MK2 ECU

Postby rell_001 » Tue Jun 30, 2015 7:31 am

Thanks for the prompt replies.
I'm going to try to fix the ECU first. Looks like I can jump the broken terminal.
Will post progress and may need more help.
R
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Re: MK2 ECU

Postby drumtochty » Tue Jun 30, 2015 8:01 am

Good luck!
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Re: MK2 ECU

Postby rell_001 » Mon Jul 06, 2015 11:09 pm

Hi again
I cleaned the ECU up and soldered a lead to jump the broken pin.
The car is running well again. Very smooth and the idle is behaving properly also.
I have also cleaned out the drains so hopefully it won't happen again anytime soon.
Thanks for the advice.
R
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Re: MK2 ECU

Postby drumtochty » Tue Jul 07, 2015 8:00 pm

Have you also cleared the eight tiny sill drains one in front and to the rear of each jacking point front and rear.

They will hod water in the sill if not clear, this is over and above the drains behind the seatbelt towers
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Re: MK2 ECU

Postby rell_001 » Sun Apr 22, 2018 10:52 pm

Just reviving an old post from 2015 - I did get my car running but only for a year or so. However ...

In summer 2016 it died while driving. Loud click form under dash and electrics died. Eventually started but then did same again. This ws very scary as it happened on a busy road. I took it home and parked it.
Last summer I set about restoring the chassis arms, sills, suspension etc.. All was going along fine but then the stop start problem happened again. I don't really want to scrap it but I guess its not worth very much if it can't be trusted.
Its a MX5 NB 1.6 2000 (W) (not an import). The Cam Angle Sensor has been replaced and the battery is good.

Symptoms
Turn key to accessory position - Accessories work (radio)
Turn key to ignition on - Air bag warning light illuminates. Ignition warning light does not illuminate. Engine security warning lamp does not light. Can't hear fuel pump start.
Turn key to start position - Starter motor cranks engine. Engine will not fire

Very occasionally and randomly the Ignition warning light illuminates and the car starts. However it runs for either 2 seconds or sometimes around 30 seconds. There is a click under the dash and the ignition dies. Following this the ignition light does not come on and the car won't start. I think this means the immobiliser/ECU is failing
The ECU has previously been wet (drains etc from old post in 2015) but is dry now and has worked since.

Question
I think its the immobiliser - can this be removed/bypassed or do I need to replace the ECU and all the components that are coded together?
Should the immobiliser prevent starter cranking?
Any other suggestions?
Thanks in advance
R
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Re: MK2 ECU

Postby drumtochty » Mon Apr 23, 2018 8:35 am

You are well aware of the answer to your question.
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Re: MK2 ECU

Postby OldSpice » Mon Apr 23, 2018 10:40 am

:lol:
Mornin' Eddie!
There is always an imbecile you never bargained for. Usually in a Tescon carpark with a dented Zafira minus hubcaps
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Re: MK2 ECU

Postby rell_001 » Mon Apr 23, 2018 1:31 pm

Thanks for that Drumtochty?
I’ll pm you my number.
R
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