Ive reached that stage where Id like to here engine like noises. Im building a ZX12r engined stuart taylor, Ive got a complete running package form a bike i have seen running, The engine is mounted in the car and I have just connected the bike loom, but I can't achieve any outputs from the ecu, I have checked all conections against the wiring diagram, figured out all the safety lockouts so that it will turn over on the button, but their are no outputs from the ECU, I have checked all its lives and earths and everything is in order, but Im not getting either a fuel pump output to the solinoid or any other output for that matter, Im pretty certain the ECU is dead. the bike did have an alarm that appeared only to breakout onto the indicator wiring as far as ive noticed. so the bottom line is, all the ecu inputs are there, the fuses are fine, the diagnostic lamp just stays on if you earth the diagnostic lead and turn the key (no blink codes) is it safe to assume its dead or is there something stairing me in the face that im missing as I can't see how it would have died, It looks imaculate and hasn't been exposed to welding, kryptonite or the cat. any ideas?
Now that's strange. I've got the same problem I think the ECU is dead. I have no FI light,fuel pump and no spark but the engine will turn
over on the starter motor. Have you got a copy of the zx12 manual. What I did to confirm that the ECU is faulty is work through the manual testing all
the senders for continuity,input & output voltage and resistance. after the first few test it says
"blah,blah,blah Replace the ECU
I've just picked up a second-hand ecu from the post office this morning that I bought from eBay so I will keep you informed.
Carl
Check your voultage feed to your ecu.
On the bike there is a resistror on the back of the ign key barrel dont think it shows it on the wiring diagrame, think the ECU needs 9v therfore
giving it 12v tends to blow it up.
I think I have that right sure someone will be along shortly to put me on the right lines.
Regards
Agriv8
yes, ive got the zx12-r bible, the starter motor circuit seems seperate of the ecu so you can crank it over without an ecu pluged in, I will check the
vehicle down sensor and connectors to see if that is the problem, as that would make sense as I would imagine it to cut the pump and spark.
thats a good point about the resistor, I recal a few folk having blown resistors in the past. I have got a live feed, however I think its above 9v.
I just want to rule out every possibility incase Ive damaged the ecu somehow and do the same to a replacement.
Hi there
Yes the ZX9R needs a 100 Ohm resistor in the wiring to start, I believe it was part of an anti theft device so that it could not be hot wired?
Would suspect the zx12r might have the same?
Cheers
Ian
Yes you do need a 100ohm resistor
Here
Carl
quote:
Originally posted by mackei23b
Hi there
Yes the ZX9R needs a 100 Ohm resistor in the wiring to start, I believe it was part of an anti theft device so that it could not be hot wired?
Would suspect the zx12r might have the same?
Cheers
Ian
Yep resistor off 100 ohms in the grey wire of the lock too ecu.
And make sure it is getting power from the switch not permanent...... power.
Daniel
Right my problem is not the ECU as I've fitted this new one (secondhand) and the problem still persists. So bigbravedave if you need an ECU
I've got 2 The numbers are 21175-1065 & 112100-0470 12v tbcf02. So back to the testing for me!!!!!!
You need to have an earth at pins 18,26,27,35,60 with 0 resistance
You also need 12.5 volts or more at pins 17,43 with the ign switch on and when you turn the switch off the power at pin 17 should be zero volts. If
you don't get this then check
Power source wiring
ecu fuse
ecu relay
ign fuse
main fuse
Carl
Cheers, I may take u up on that offer!
I have been through that diangonsis, and have posative and earth feeds as you've described, I been using a 12v gel cell so far with loads of
grunt, Ive got the correct battery for it now so, ill put that on.
another question I have is should the FI light flash continuously when you press the start button?
where abouts is the 100 ohm resistor? Im yet to find it!
It's built into the ignition lock on the bike, if you don't have that you need to fit your own resistor.
thankyou, I have been on a couple of zx12-r forums and the general consenious is that if you get a flashing fault code LED when you press the start
button, but can't enter any of the diagnostic modes then the mystery grey wire isn't delivering its mystery voltage to activate the ecu. I
have poped the cover off the back of the ignition switch and can't see a resistor in it, aparently complete bike "lock sets" are worth
a bit, and I may have a different ZX..... ignition lock without a resistor in it.
ahh well the good news is that my ecu might be ok, ill get the multimeter out and investigate the grey wires voltage/resistance.
Thanks for all your help so far, much appreciated
Fit one in the grey wire and try it if everything else works, just cut the wire and join it back together with the resistor. I got 3 for £1 from the local electronics shop.
Thanks a million folks, got the engine finally running and everythings happy especially me :-)
Despite having the entire loom and parts and seeing the engine running before purchasing it, the breakers must have swapped the ignition switch for a
zx9 one without the 100ohm resistor in it! I took it apart and no resistor, then realised it had a slightly yellower discoloured plug on it then its
mating connector also the wires where marginally larger in gauge. I multimetered the grey wire and it showed 1.9ohms. so in went the 100om resistor,
on went the ignition, fuel pump primed (for the first time) put the plugs back in and it started on the button.
Thanks a million guys, you've made my evening! ..... simple things aye!
And I started mine tonight as well, You need a 100 ohm resistor with at least a wattage rating of 5 watts. It cost me about 30p from Maplins.