Race Engine Forum UK

I used this scheme to check my ECU cables with multimeter.


And here what I found out:


Could this be the reason why injectors aren't opening(I checked,they dont)?

It would certainly cause some unexpected behaviour - the fact that the main relay is not earthed would stop the relay working and without the relay working properly the whole system would misbehave.

The broken connection to the coolant temperature sensor is less critical but ultimately this will need fixing too.

Ah... THANK YOU Julian.

I remember when i first tryed to start the engine relay started the fuel pump but it didn't stopped it after 10sec or so.
Now I now what the problem is.

Thank you everyone.
'll post when I fix this problem.

Well I solved one of the problems(at least I think so).
Bad earth to ECU.
But car didn't started again.
Injectors just don't want to open.
And pump is not stoping after some time(it should stop working after 10sec. I think).
When I crank the engine i sounds like it's going to start but then nothing,it just continue to cranking.

I took multimeter and measured some REALLY strange things.
I switched it to Ohm's just to check are the right devices connected to right pins,but this is what I measured:
PIN12>>>>>87(on relay)=8.0
PIN9>>>>>>87(on relay)=0.1
PIN13>>>>>PIN9=8.0
PIN1>>>>>>31(on relay)=0.8
PIN1>>>>>>30(on relay)=0.6
PIN1>>>>>>1(on relay)=nothing
PIN1>>>>>>15(on relay)=0.2
PIN1>>>>>>87(on relay)=nothing
PIN1>>>>>>87b(on relay)=nothing
1(on relay)>>>>>>wire from ecu which connects to coil(bobina on scheme) 0.7
PIN12>>>>>>>Injector1=one side9.0,other side 3.8
PIN12>>>>>>>Injector2=one side11.6,other side3.8
PIN12>>>>>>>Injector3=one side19.5,other side3.8
PIN12>>>>>>>Injector4=one side nothing,other side 3.9

Loos like that two wires which are coming to each injector are in some connection and as the scheme says they shouldn't,or I dont see it.