M50 wiring help?

[tonytony]

i checked my crank pulley and its on there how it should be, i answered one of yoru questions jason, and i'm not getting any power at the fuse. It should be hot while the key is still in the on position correct?

[tonytony]

I'm glad yours started up!!!! but mine unfortunately is still struggling to start, i'll go recheck my crank pulley i'm sure it's in there tight and at the right spot.

[eko]

IT RUNS!!!!!!!

Right an explanation as to why it wouldnt run

Was fitting the induction filter today,and when i looked down the front of the engine i thought,that bottom pulley looks a bit skew wiff
Put my hand down there only to find the thing virtually hanging off!

Only explanation i can come up with is -
I took off the air con pulley before putting the engine in,replaced all 6 bolts and tightened them,well when i first attempted to start it once fitted all i got was a clunk,like the engine was siezed.
I narrowed it down at the time to the original 6 bolts being a bit too long and i loosened them all off to check the engine turned over,and it did.
Thats where it ends till today.
All 6 bolts had worked themselves right out,hence the pulley was sat about half inch away from the crank sensor - no spark or fuel!

Put 6 shorter bolts in it,turned the key and the thing fired first go,couldnt believe it when it fired

So,looks like im the wanker of the week

I took a short video of it firing up and the noise
Tried hosting the video but it is playing up!

Big thanks to Ian332isport and anyone else who i pressured for help,couldnt have done this without you

Still loads of jobs to do,but at least it runs,I am a happy man(but a bit embarrased).

[Addissimo]

You're using an e34 harness?

Are you absolutely sure that the grounds are done properly? I thought I was for like a month, then I rewired some of the wires near the battery terminal & got it running. If I remember correctly, there is only 1 power wire and 2 grounds. Have you verified you're actually getting voltage to the ecu? Pin 6 on your c101 helps with that.

[eko]

I thought that going from the positive on a battery thru the bulb would test ground when cranking?

[Jason89i]

Nice one Jason!
I am using a bulb from ashtray light to test for power.

Basically,i switch ignition on,put one end of my tester in the first red/white,touch the other end to earth and it illuminates,
repeat the process on the other red/white and it illuminates too.

Then using the same method,i put one end of tester to battery positive and the other to brown/green to see if it would earth when i crank the engine but it didnt?

brn/green is a switched ground signal from the ecu. (hence the BROWN color to the wire.) WHY are you sending 12v to an ecu ground signal? never mind....i really dont want to know.
jason

[eko]

Nice one Jason!
I am using a bulb from ashtray light to test for power.

Basically,i switch ignition on,put one end of my tester in the first red/white,touch the other end to earth and it illuminates,
repeat the process on the other red/white and it illuminates too.

Then using the same method,i put one end of tester to battery positive and the other to brown/green to see if it would earth when i crank the engine but it didnt?

[Jason89i]

I know the pump and relay are working ok because i fed a temp 12v to the green/violet wire and it pumped fuel up!

I am getting power into the fuel relay thru the 2 red/white wires.
Not getting and 12v from the relay at cranking???????

As you can tell i am very naive when it comes to car electrics!

nothing wrong with being naive. but i HIGHLY recommend understanding how a wiring diagram works, and how the engine management works. i will gladly help walk you through ANY questions you have regarding understanding the wiring diagrams.

go buy a bentley. turn to page ele-77 (its an electrical diagram.) it shows all the engine management items for the m50 to run. its very simple. look for the fuel pump relay. it will show 4 wires coming out of the fuel pump relay. it will also show what relay pin number AND the color of the wire. you can then start to trace where power should be coming from, and where it should be going.

ok, back to your question......

so your telling me that relay pin 85 (red/wht) and relay pin 86(red/wht) are getting power.....but.....whats not getting power when you are cranking?
(wire color or relay pin number.)
grn/vio i assume???

please verify.


cheers, jason

[eko]

how do you know the fuel relay is working fine?

ok, time for some more information. diagnostics is simply working backwards. just answer these simple questions and viola......the answer will show itself.

is there any fuel pressure if you disconnect the supply line from the fuel rail?
is your fuel supply line connected to the radiator side of the fuel rail?

now get a voltometer
is your fuel pump getting power?
is the fuse blown?
is the fuse receiving power when your trying to start?
is the fuel pump relay sending power out the green/violet wire?

I know the pump and relay are working ok because i fed a temp 12v to the green/violet wire and it pumped fuel up!

I am getting power into the fuel relay thru the 2 red/white wires.
Not getting and 12v from the relay at cranking???????

As you can tell i am very naive when it comes to car electrics!

[Jason89i]

Done that lot already,and double checked!
Fuel relay is working fine and there is 12v at both red/white wires going to it ?

how do you know the fuel relay is working fine?

ok, time for some more information. diagnostics is simply working backwards. just answer these simple questions and viola......the answer will show itself.

is there any fuel pressure if you disconnect the supply line from the fuel rail?
is your fuel supply line connected to the radiator side of the fuel rail?

now get a voltometer
is your fuel pump getting power?
is the fuse blown?
is the fuse receiving power when your trying to start?
is the fuel pump relay sending power out the green/violet wire?

[eko]

Check your ground wires, check your relays , and check your fuses. You might have the wiring correct already and something small like a fuse might be holding you back.

Done that lot already,and double checked!
Fuel relay is working fine and there is 12v at both red/white wires going to it but from what Ian has told me the ECU is not telling it to supply fuel.
Also no spark so imagine these 2 are related?

[aeryk7]

Check your ground wires, check your relays , and check your fuses. You might have the wiring correct already and something small like a fuse might be holding you back.

[eko]

im doing my best to stay off my soapbox regarding doing your own work......ETK is your friend.

there are A LOT of different wiring configurations. i doubt it has anything to do with the c101 though. there's only one wire that will keep the nv-m50 from firing.

cheers, jason

I meant the M50 wires going to the C101.

Which wire do you refer to for not firing?

[Jason89i]

I sent you the link last week for addismo's correct?

im doing my best to stay off my soapbox regarding doing your own work......ETK is your friend.

there are A LOT of different wiring configurations. i doubt it has anything to do with the c101 though. there's only one wire that will keep the nv-m50 from firing.

cheers, jason

[eko]

you did,but thats for later model E30`s!