EEC IV problems - No start
 

Hi folks, tried to start the car today but no joy whatsoever. I have the earths and +12 permanent and 12 v switched all going to the ECU but when I turn it on the pump does not run. If I measure the output from the ecu it seems to be trying to do something as it switches from 0 volts to about 0.35 volts for a couple of seconds. Looking at the Haynes diagram the pump relay has a live on one side, the ecu feeds the other side so I would expect to see 12 volts between pin 22 and the 12 volt terminal when first switched on.
Just to expand a bit I have earth on pins 16, 40 and 60, perm 12 volts on pin 1 and switched 12 volts on pins 37 and 57 of the ECU.
I have tried hooking up a strobe and there is no spark when cranking.
Am I missing something obvious? Everything looks connected up ok but I am scratching my head at the moment.
Thanks in advance,
Enoch

I think there is a pinout on my website for the noncat twincam.

Do you have +12v switched live to the coil?

TT

Whats switching to .35v??

TT

Is the fuel pump feed from the ecu to the relay an earth or +12v?

Pin 22 should drop from floating to earth. So measured with a meter from the +12V on the battery to pin 22 should give a few seconds of +12V to prime the pump. Do this with relay D disconected.

IS 20 Grounded?

TT

Hi folks, thanks for taking an interest in this - a bit more info. When the ignition is off the pump is running. When I turn the ignition on the pump stops. Pin 20 is grounded, sorry missed it off the list.
The 0.35 volts is the reading from ground to pin 22 when I switch the ignition on. All I seem to get is a click ( sounds like an injector) when I switch on, nothing else seems to happen - no spark - nuffink, the injectors don't fire.
Most confusing.

have you been rewiring? the pump should never run with the ignition off.

TT

Don't measure voltage to ground from pin 22, you won't get any sensible reading. 22 is pulled to ground inside the ecu, you either need to try a continuity test from ground via pin 22 ( no continuity ignition off , 2 seconds with ignition on whilst prime takes place ). Or the same with +12V from the battery through the meter using 22 as the ground and meter on voltage.

TT

Hi there, you are quite correct - it should not run with ign off. I just went and redid it so that the +ve side of the relay goes to a switched live instead of perm live. What now happens is that when the ignition is switched on the pump runs for about 3 seconds then stops (I think this is correct?). Still not getting any spark or sound of injectors firing. Think I am getting CPS signal because when I stop cranking the pump runs again for a couple of seconds - I assume the pump will run when the cpu sees crank pulses and the rail pressure is low?
Bloody witchcraft:)

Also Have you bypassed the antitheaft module? You won't get +12V at the coil or to the engine management relay XI if the imobaliser module is not bypassed or the module is in alarmed mode ( it's a black module about 3" x 2" 16pins in 2 rows).

TT

I have hardwired perm 12 to pin 1 and switched 12 to 37 and 57. I have not hardwired the coil +ve though. Will have a look and see if it has 12V on it.

Actually - a quick thought. Does the coil have 12 v one side and the other side get switched by the ECU / ignition amplifier?

Coil negative is switched my the ingnition amp

coil +12 is ignition live via imobaliser

and injector system voltage is fed from relay XI , but you should have back feed if your living up 37 & 57.

TT

The Black Pin on the 8 pin oval plug ( C2053 ) is you ignition live feed that would come from Relay XI.

TT

P.S. I am supping beer. Your not allowed to till it fires, I will be here steadily geting tipsizier

TT

Hi TT - Some progress!! I have been drinking beer too, I had to do a barbie earlier and it's illegal in Bracknell to cook without drinking beer:D I have now got a spark and the pump kicking in when it should. I had missed the live off the ignition amp when connecting the live direct to the coil. It's one hell of a bleedin' spark on it - does the coil take the full 12 volts? There is a small component near the coil that I can't identify. It is in the black wire - it terminates in a 6mm threaded terminal. Is this a ballast or something? I know the green wire has a suppressor in it but this is something else.
Thanks for the help so far, I feel the smell of exhaust fumes is ever closer...
Enoch

Right, if you have spark, and the pumps running then finaly check you have +12V at the injectors on their black wire. If this checks out we should be running or at least firing.

I would pull the plugs and pop em on the barby for 15 mins followed by a light rub with some wire wool/ pan scourer/ wet'n'dry to clean em up... She wil probably fire after that.



TT

yes it's a 12v coil.

The item in line is a filter or choke or something...

TT

Thanks matey, it's too late now and we have a guardian of public morals and sensibilities lives next door to us so I best not push it:) Will be at a car boot in the morning but hope to get back in time to try it before the footy.
Will let you know how I get on.
Best and all that,
Enoch

Pull the plugs now, will give the vapour in the cylinders a good chance to clear off before tomorrow.

TT

Just spotted the neighbour going out. I had not put fuel in up until now as I wanted to make sure everything was ok (spark, pump, injectors) before going for it. So put some fuel in, furned the ignition on and off 5 times until I could hear the pump pushing fuel back in to the tank, held my breath and.......



















SHE LIVES!!!! Started first time and ran as smooth as a cashmere codpiece. Bit louder than I thought and I suspect very rich but it ran. Turned it off pretty quick as it is a bit late but will get back to it tomorrow. All the wiring is in dangley mode at the moment so I will cut it all back, rejoin it and tidy it all up. Then just need to get my prop from D&F and I can give it a quick once around a private car park. Happy days.
Thanks for all those that helped, especially the fountain of all knowledge - TT.
Best and all that,
Dave.
PS don't ask me for a video I have no idea how to do that.:)

Fanmadgeatastc :)

TT

Brilliant - congratulations on getting the engine going - I hope the obligatory video is to follow :p