I think I need a new ECU! — Electrical

#1 ratbiker Thread starter

11 Jun 2010 19:29

Hi all due to my tachometer not working I have carried out the tests from the manual, the yellow / green wire into the back of the clocks is only receiving .88 volts when the engine is running. The manual states it should be getting at least 10.5 volts. So it looks like the ECU is up the spout.

I don't suppose someone would mind checking the voltage on their yellow green wire coming out of the clocks or the end that goes into the light grey connector on the ECU?

I would be so grateful as I know an ECU is not going to be cheap!

#2 Veefer800Canuck

11 Jun 2010 19:44

Could you test that same wire where it comes out of the ECU and see if the voltage is the same?

I'm thinking that it may be broken/poor contact somewhere in the wiring loom.

SebSpeed posted a spare wiring harness that he unwrapped and dismantled, and Honda uses a TON of splices in their wiring harnesses which frankly scares the crap out of me.

If I were doing it, it would be one continuous wire from point A to point B with no splices.

#3 ratbiker Thread starter

11 Jun 2010 19:54

[image: View Post]Veefer800Canuck, on 11 June 2010 - 02:44 PM, said:

Could you test that same wire where it comes out of the ECU and see if the voltage is the same?

I'm thinking that it may be broken/poor contact somewhere in the wiring loom.

SebSpeed posted a spare wiring harness that he unwrapped and dismantled, and Honda uses a TON of splices in their wiring harnesses which frankly scares the crap out of me.

If I were doing it, it would be one continuous wire from point A to point B with no splices.

Sadly its the same voltage coming out of the ECU! :(

#4 Veefer800Canuck

11 Jun 2010 20:01

Well, at least you aren't in the same boat as this guy :laughing6-hehe: :laughing6-hehe: :laughing6-hehe:

http://www.zxforums....-need-help.html

#5 ratbiker Thread starter

11 Jun 2010 20:09

[image: View Post]Veefer800Canuck, on 11 June 2010 - 03:01 PM, said:

Well, at least you aren't in the same boat as this guy :laughing6-hehe: :laughing6-hehe: :laughing6-hehe:

http://www.zxforums....-need-help.html

That is quite funny I have to say... still in the same sort of boat as we both need one...least he has been offered one!!! LOL

#6 SEBSPEED

12 Jun 2010 14:55

Hey ratbiker, what kind of bike do you have??

#7 ratbiker Thread starter

12 Jun 2010 17:19

[image: View Post]SEBSPEED, on 12 June 2010 - 09:55 AM, said:

ratbiker, what kind of bike do you have??
hi

Hey Buddy

I have the 03 Vtec model. Non ABS.

Update, when the clocks are plugged in i get 0.91 ignition on engine not running, and 0.88 with engine running.

When the clocks are unplugged i get 12.3 volts ignition on engine not running and 9.3 volts engine running.

#8 ratbiker Thread starter

13 Jun 2010 11:55

The story so far and the checks I have done.

1. Tachometer stopped working whilst balancing the starter valves.
2. Ignition pulse generator working fine.
3. All earths are fine.
4. All fuses are fine.
5. No loose wires.
6. Continuity checked between the ECU and the Tachometer plug into back of clocks, and then into the clocks to the soldered joints, all fine.
7. Voltage checks:

Clocks not plugged in

ECU providing 12.3 volts ignition on engine off
ECU providing 9.3 volts ignition on engine running

Clocks plugged in

ECU providing 0.88 volts ignition on engine not running
ECU providing 0.88 volts ignition on engine running

Lost the plot now and I have run out of ideas. I am thinking again that it looks like the ECU.

Any ideas would be realy helpful at this point. Thank you.