2004 US NON HISS Wiring Diagram (help)

If you look on the bottom of your ignition does it look like this? On U.S the ecm is looking for less than 12volts to turn on the fuel pump. They installed a zener diode to drop the voltage to tell the ecm to turn on.

If someone could help me with this it would be great. I'm about to start smashing things up! Haha

I've been down to the local electronics shop and brought 3 different Zener diodes, 3.3v, 3.6v, 4.3v.

I've got my feed coming off my switch which is reading 12.3v on the meter.

I've connected each diode with the black band facing towards this feed (+, positive) and these are the readings I'm getting at the other side of the diode.

3.3v = 11.15v

3.6v = 10.8v

4.3v = 10.2v

Obviously this isn't enough of a drop which I find strange as everyone seems to say 3.3v does the job. Also, 3.3v doesn't seem to relate to the voltage drop.

Anyway, I thought I would see what happened if you link these up in series to see if that worked.

3.6v + 4.3v = 9.15v

3.3v + 3.6v + 4.3v = 8v

Still, none of the above voltages are starting the bike???

I've got a wire coming from the neg side of the diode going to the black connector on the ECU, slot number 30. I'm wondering if I have the wire going to the wrong slot on the ECU? I've got it going there as this is where the pink wire goes when coming from the HISS on my EU ECU. I downloaded a manual for the us bike but the quality is to poor to actually read the slot numbers on the connector so maybe this is wrong. If someone could check there manual for me it would be great.

Anyone got any idea what I'm doing wrong?




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Long/short side correlates to the picture I posted above.


Something else you can check is your fuel pump relay. On the US bikes it triggers a ground from the ecm to turn on the pump. If you manually ground the relay it should still come on.

Question if the bottom of my ignition switch looks like this does that mean I have HISS?
I have a 2003 Honda CBR600RR with this same ignition switch.


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Grimmy said:

Would any of you American guys be able to post up a clear picture of a wiring diagram for the 2004 non hiss bike for me. I have found a couple on google but none are clear enough to read.

Or does anyone have a link to one I can download.

Basically, I've just had a NON HISS 04 ECU sent over from the US with the aim of removing the key start on my trackbike, but I can't seem to get it working with my modified EU wiring harness. Not sure if it's something I've wired wrong like the side stand etc, or if the US ECU needs another 12v feed like I've see one guy doing on a vfr.

Everything seems ok apart from the fuel pump not priming, all it would with a EU ECU with the immobiliser still on.

Has anyone tried doing this yet and had any luck?

Any help would be much appreciated!


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Click to expand...

Here you go bruv



I have no idea why they turned upside down. Lol