ECU Power Assistance - Wrist Twisters
 
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post #1 of 22 Old 08-15-2019, 08:35 AM Thread Starter
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ECU Power Assistance

Good Day all,

I need some assistance with the american ECU, Im from South africa and struggling to find the correct information.

Basically, i purchased a wrecked bike and busy rebuilding the bike. The issue is the key was never found after the accident, and as you all know there i no way to bypass HISS...

So, i purchased an 02 ecu from ebay from California and it has just arrived. I know that the only difference between the USA and EU ecu was the USA had additional power to the ecu, but i cannot seem to find a consistent opinion on which pin i need to add the additional power line to and how much power i need to supply.

The best info i can find is that pin 29 on the light plug needs an additional 9V, but i do not want to short anything. can anyone confirm this information?

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post #2 of 22 Old 08-15-2019, 08:52 AM
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The DropBox account for the site contains the US service manual, which has the wiring diagram in it - that should help tell you what goes where.

1986 Honda Nighthawk 700S
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post #3 of 22 Old 08-15-2019, 08:54 AM Thread Starter
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Quote:
Originally Posted by CB700S View Post
The DropBox account for the site contains the US service manual, which has the wiring diagram in it - that should help tell you what goes where.
Thank you!

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post #4 of 22 Old 08-15-2019, 09:11 AM Thread Starter
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So i took a look, and i cannot find the additional power source, or even pin 29. Looks like the connector goes to up to pin 22...

Anyone have any experience with ecu wiring

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post #5 of 22 Old 08-15-2019, 09:34 AM Thread Starter
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I see on my wire harness, I have pin 20 wired in on pink, but pin 19 is open. And in the manual, pin 20 is open and pin 19 is wired with pink. Should I just swap the pins? Could I fry the ecu?

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post #6 of 22 Old 08-15-2019, 12:13 PM
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For myself, I'd be tempted to check this part here: "I know that the only difference between the USA and EU ecu was the USA had additional power to the ecu"

Where did that information come from?

I would also be inclined to plug everything together as is, and see if that yields a result..

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post #7 of 22 Old 08-15-2019, 12:14 PM
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Can you check one wiring diagram against the other?

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post #8 of 22 Old 08-15-2019, 03:17 PM
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Found my hard copy workshop manual, which has two different wiring diagrams, one for "02-03" model labelled 030Z-MCZ-6700 and 030Z-MCZ-7700, the other for "after 03" model labelled 030Z-MCZ-A100 and 030Z-MCZ-L100.

Can't see a mention of HISS on either of them. You might already have access, but if you would like a pic of the wiring shown to the ECU, let me know.

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post #9 of 22 Old 08-15-2019, 11:23 PM
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I would chase the wires down on the diagram - don't assume that the same color wire does the same thing on two different markets' wiring. Doing so is a good way to kill electronics and start fires.

1986 Honda Nighthawk 700S
2002 Honda 919
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post #10 of 22 Old 08-16-2019, 07:37 AM Thread Starter
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Quote:
Originally Posted by K1w1Boy View Post
Can you check one wiring diagram against the other?
I cant seem to find an EU wiring diagram.

i plugged the ecu in and there is no more HISS light on the dash, but fuelpump doesnt prime and there is no spark. If i ground the fuel pump relay i get the pump working, and the ignition coils tested good.

in searching online on ways to bypass HISS, i came across videos of guys showing on different honda models, and how they go about it. the just of it is, that they supply additional power to the USA ECU's with 9v on a specific pin and the bike starts up. If they do not do this, the result is the same as what i am getting. No HISS on dash, but no prime or spark.

Could you send me a pic of your wiring on your ECU (Light grey side) if you have it available, dont want you stripping your whole bike for this.

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post #11 of 22 Old 08-16-2019, 07:37 AM Thread Starter
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Quote:
Originally Posted by K1w1Boy View Post
Found my hard copy workshop manual, which has two different wiring diagrams, one for "02-03" model labelled 030Z-MCZ-6700 and 030Z-MCZ-7700, the other for "after 03" model labelled 030Z-MCZ-A100 and 030Z-MCZ-L100.

Can't see a mention of HISS on either of them. You might already have access, but if you would like a pic of the wiring shown to the ECU, let me know.
Do you Have HISS on your bike?

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post #12 of 22 Old 08-16-2019, 03:26 PM
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I think that 9V is probably from or to the instrument pod. That's the only thing I can think of as providing 9V in the system.

1986 Honda Nighthawk 700S
2002 Honda 919
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post #13 of 22 Old 08-16-2019, 04:06 PM
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Quote:
Originally Posted by Mookasaur View Post
Do you Have HISS on your bike?
Yes, I do.

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post #14 of 22 Old 08-16-2019, 08:04 PM Thread Starter
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Quote:
Originally Posted by CB700S View Post
I think that 9V is probably from or to the instrument pod. That's the only thing I can think of as providing 9V in the system.
How do I go about asking someone in the forum who has a non hiss bike to send a picture of their ecu plugs to check what’s going where

Also, is there an EU service manual floating around on the web or available here?

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post #15 of 22 Old 08-16-2019, 08:04 PM Thread Starter
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Quote:
Originally Posted by K1w1Boy View Post
Quote:
Originally Posted by Mookasaur View Post
Do you Have HISS on your bike?
Yes, I do.
Thanks, I would need a non hiss system I think

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post #16 of 22 Old 08-16-2019, 08:32 PM
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Quote:
Originally Posted by Mookasaur View Post
How do I go about asking someone in the forum who has a non hiss bike to send a picture of their ecu plugs to check what’s going where

Also, is there an EU service manual floating around on the web or available here?

As for the latter, no idea. There's a UK-based Hornet board that serves all the Hornets, including the 900 aka the 919, but I've not seen a manual over there that I recall. This forum tends to be US-focused.


My 919 is currently not being used due to weather and a nagging health issue, I may be able to go check it over the weekend.

1986 Honda Nighthawk 700S
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post #17 of 22 Old 08-16-2019, 08:35 PM
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Quote:
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Thanks, I would need a non hiss system I think
Fair enough.

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post #18 of 22 Old 08-16-2019, 08:38 PM
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I wonder if this guy could help?
https://rover.ebay.com/rover/0/0/0?m...2F251497699854
Maybe post him your old ECU and he could do his thing.

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post #19 of 22 Old 08-16-2019, 08:46 PM Thread Starter
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Originally Posted by Islandboy View Post
I wonder if this guy could help?
https://rover.ebay.com/rover/0/0/0?m...2F251497699854
Maybe post him your old ECU and he could do his thing.
Thank you, i will contact him and see if he can offer any advice

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post #20 of 22 Old 08-17-2019, 11:07 PM
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Apply the 9 volts to the pin that you need to. You can use a linear voltage regulator (pin 1 is 12V, pin 2 is ground, pin 3 is the output 9V.) You can use the LM7809. is very popular and cheap.

Date here: https://www.mouser.ca/ProductDetail/...PqjPjXZOpljMCU

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post #21 of 22 Old 08-17-2019, 11:10 PM
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post #22 of 22 Old 08-18-2019, 11:21 PM Thread Starter
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Quote:
Originally Posted by Dario_hawk View Post
Apply the 9 volts to the pin that you need to. You can use a linear voltage regulator (pin 1 is 12V, pin 2 is ground, pin 3 is the output 9V.) You can use the LM7809. is very popular and cheap.

Date here: https://www.mouser.ca/ProductDetail/...PqjPjXZOpljMCU
Thanx, the issue is i am uncertain what pin needs the additional voltage, im struggling to see this n the wiring diagram.

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