18 replies to this topic

[Mrio]

Hello Everyone,

 

I have a 1.3 SPI mini with manual gearbox from 1995. One day when driving, the engine just stops. After months i've found out that 2 wires had melted somehow (see picture 1 and 2). After repairing this, the car wouldn't start. When turning the key to the 2nd position, you would normaly hear the fuel pump for a few seconds then stop. When you turn the key to the last position, the engine should crank. Both does not work.

 

All electrical stuff (lights, horn, wipers, etc) works. You would normally hear a click comming from the relay box. Nothing.

 

So I replaced the loom from the engine bay all the way to the back with a new one without alarm. I've also replaced my ECU and relay box, STILL NOTHING!

 

So I went to opened my relay box and pressed all 4 transistors (or what it's called) and voila, fuel pump working, engine cranking. But engine won't start because the ECU is not opening the nozzle on the injectors.

 

I've studied the Haynes manual and notice a switch for the automatic gear box. I went searching and found a white plug, which I then hopefully bypass (see picture 3).

 

STILL NOTHING! AARG!

 

What am i still missing? Hoe do I force the ECU to send fuel to the Injectors? What are the checks performed by the ECU to at least crank the engine? I've tested every cable (except sensors). Need help, I'm stuck for months now.

 

Thanks in advance!

 

https://www.dropbox....0614_105203.jpg

 

https://www.dropbox....0614_105208.jpg

 

https://www.dropbox....0626_142310.jpg

Edited by Mrio, 26 June 2014 - 02:07 PM.

[xrocketengineer]

This should be moved to the injection section.  Is the car auto? Does it have an alarm?

[Mrio]

Car is not auto and have no alarm.

[lsto]

If the auto gearbox switch was at fault the engine would not turn over. If yours is manual then don't worry because its not connected. If your engine turns over but does not fire then your prob not getting a signal to your crank sensor. Check this has a feed, if it has the sensor may be at fault or if it has no feed you may have blown a fuse.

[coopdog]

If the auto gearbox switch was at fault the engine would not turn over. If yours is manual then don't worry because its not connected. If your engine turns over but does not fire then your prob not getting a signal to your crank sensor. Check this has a feed, if it has the sensor may be at fault or if it has no feed you may have blown a fuse.

inertia switch?

[Mrio]

Engine does not turn over. There is no clicks in the relay pack. I've tested the relay pack and switched with 3 others. But still no "click". Inertia switch works properly. Have tested also with another one.

How can I test the crank sensor with a multimeter? Just put multimeter in plug and crank the engine?

[nz_seamless]

Does the relay pack get a signal?

Have you checked all the fuses, especially inline ones. A melting short is likely to have blown some safety points.

[Fast Ivan]

I don't think a faulty crank sensor would cause the problems you are having, it would prevent it firing up but not cranking over. Your problem is at or before the relay pack I recon.

first up I would do as nz has mentioned and double check all the fuses, also there is a pinned section in the injection area that deals with the relay pack in some detail.

However it does also have the symptoms of an immobiliser issue. 

[xrocketengineer]

What is the ECU part number? It must be MNE1010XX. If it is MNE1011XX it requires a matched alarm/immobiliser or the code has to be removed to operate without that. That is what I have on mine.

[FlyingScot]

Moved to injection section
FS

[FlyingScot]

As per xrocketengineer , please give details of the change of ECU and MFU (relay unit) part numbers please.
Crank sensor will as Rob Mac has already written will not prevent cranking of the engine. The MEMS ECU looks for a signal during cranking of the motor to check for rotation, if it's not present it prevents fuelling.

Without more information it's a little difficult, I could be you damaged your original ECU with the shorts and the issue you have now is unrelated. What colour wires were shorted ? (Difficult to see I your pictures) as this may give us a clue.

FS

[Mrio]

Been testing every single fuse including a piece cable (to make sure it has a connection) this weekend, but everything is good.

The relay pack does not receive signal from the ecu, but does receive 12 volts. So it must be before the relay pack. Are there any fuses between the relay pack and ECU? Haynes manual says none?

I have no immobilizer.

@FlyingScot: is it worth replacing the crank sensor? I tried cranking by putting 12 volts on the startmotor...but no fuel is comming out the injection spray.

Color brown and red blue was melted together. I'v replaced the whole loom, ecu and relay pack.

How can i force fuel out of the nozzle? Anyone a electrical schema of an ecu?

Edited by Mrio, 29 June 2014 - 02:10 PM.

[FlyingScot]

No fuse, please let me have ECU part number to rule out that you replaced ECU with one which is expecting a code from the immobiliser. I appreciate you don't have one now.

FS

Edited by FlyingScot, 29 June 2014 - 03:55 PM.

[Mrio]

My ECU number is MNE10078 3401 4036 (Thats a whole other number!)
Relay box also has a number YMB 10022-F

I also have an ECU without a number?!

Edited by Mrio, 30 June 2014 - 09:50 AM.

[xrocketengineer]

My ECU number is MNE10078 3401 4036 (Thats a whole other number!)
Relay box also has a number YMB 10022-F

I also have an ECU without a number?!

 

MNE10078E ELECTRONIC CONTROL UNIT, Manual, Cooper, up to (VIN) 060487, Japan.

 

from:

http://www.somerford...page=page&id=76

 

Does it have two connectors? It appears to be too old for a 1995 Cooper which should be MNE101070 or MNE101170 (with alarm) with a single connector. My 1994 Japanese Cooper with no alarm came with the MNE101070.  Now it has an uncoded MNE101170 so it works without the alarm.

 

http://www.minispare...ck to catalogue

 

 

YWB10022 RELAY, engine management 1991-96; fuel injected models.

 

from:

http://www.somerford...page=page&id=88