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Engine Bay Fuse Box


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#1 tom1

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Posted 01 September 2019 - 02:43 PM

Hi, I have a mpi with a 4 way fuse box under the bonnet, at the front on the fly wheel side. Which end/fuse, is number 1 and which is number 4? The fuse which has blown, is the one nearest the middle of the car (all are 30 amp). I don't know if this is the problem, or something I have just found, in looking why it won't start.

 

The problem I have is that it won't turn over\start. The immobilizer light goes out.  It had a new start motor on Wednesday & has been going great.

 

If you could help me with which fuse it is, then I have got more chance, looking at the wiring diagram.

 

Thanks Tom



#2 RedRuby

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Posted 01 September 2019 - 03:00 PM

Looking at it from the front of the car number 1 on the left, therefore it would seem that your blown fuse is number 4 which controls the MEMS Relay and the manifold heater relay if an ex Japanese import.

Function

1. 30 amp Passenger compartment fuse box - fuses A9, B1, B6, B9 and C4

2. 30 amp Ignition switch, auxiliary relay

3. 30 amp Lighting switch

4. 30 amp MEMS relay module / manifold heater relay (Japan)


Please see the attached file, the fuse box and it’s circuits are on page 2.1

Attached File  77DE08AE-1E1E-45D5-BD92-22306B6772C5.png   150.9K   1 downloads

Edited by RedRuby, 01 September 2019 - 03:18 PM.


#3 tom1

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Posted 01 September 2019 - 03:20 PM

Thanks for that.

Not a jap import as far as I know.

Mini spare do I new 1 for £86.39. but I am unable to say at this point if this is faulty unit ?

I am also out of large 30 amp fuse, to do much more testing on a Sunday afternoon. 

I think my next step, will be to unplug the MEMS relay module and then fit a new fuse and see if it blows.

 

please fell free to comment on any of this.



#4 tom1

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Posted 02 September 2019 - 06:55 PM

 I have removed plugs from the engine management unit & replaced the fuse. Turned the key and this time the fuse didn't blow.

Do I pay for a new management unit ?

I can't think how this could make the fuse blow ? But could see that if it was faulty, how the mini wouldn't start.

Any one got any good ideas ? 



#5 Bat

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Posted 02 September 2019 - 08:50 PM

Hi,

The starter motor relay is in the mems relay module.

As is the relay for the lambda sensor, the fuel pump and the ECU main relay.

By leaving the ECU unplugged the relays have not activated so thats why the fuse hasn't blown.

Cheers :)



#6 tom1

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Posted 02 September 2019 - 09:09 PM

So do you think that a faulty ECU could be the sole course of the problem ? non starting and fuse blowing ?






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