No power to igniter from ECU??
Thread Starter
Joined: Aug 2006
Posts: 5
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From: Ottawa, ON, Canada
No power to igniter from ECU??
Hi,
I went out to go to work this morning .. any my 91 EXR wouldn't start.. fuel pump is running, so I went to check the igniter/coil.
The wire (yellow/black) that runs from the ECU to the igniter was only producing 0.02 volts. What is strange is that if I disconnect the harness on the passenger side, the terminal that correspons with the one connected to the igniter has 10V supplied. Continunity between the terminal and the igniter checks out. So I cut the wire coming out of the harness thinking that it may be shorting with something else, and if I plug the harness back in, it again only provides 0.02 volts. Is something else shorting out causing the ECU to not send a signal to the igniter???
Thanks!
-Matt
I went out to go to work this morning .. any my 91 EXR wouldn't start.. fuel pump is running, so I went to check the igniter/coil.
The wire (yellow/black) that runs from the ECU to the igniter was only producing 0.02 volts. What is strange is that if I disconnect the harness on the passenger side, the terminal that correspons with the one connected to the igniter has 10V supplied. Continunity between the terminal and the igniter checks out. So I cut the wire coming out of the harness thinking that it may be shorting with something else, and if I plug the harness back in, it again only provides 0.02 volts. Is something else shorting out causing the ECU to not send a signal to the igniter???
Thanks!
-Matt
Thread Starter
Joined: Aug 2006
Posts: 5
Likes: 0
From: Ottawa, ON, Canada
Re: (v4lu3s)
Grounds check out, ECU is powering up OK (~5V at MAP sensor terminals, and battery and oil pressure lights illuminated)
Could the ECU be bad?? I find it stange why I'm getting 10V KOEO at the wiring harness with it disconnected, but when I attach the harness, the voltage disappears. This is with the three distributor connectors disconnected. It seems to be pointing to a) shorting causing ECU to drop signal, or b) bad ECU
Does anyone have a link to a pinout of the main wiring harnesses, specifically the one on the passenger side with the ignition signals.
Cheers
Could the ECU be bad?? I find it stange why I'm getting 10V KOEO at the wiring harness with it disconnected, but when I attach the harness, the voltage disappears. This is with the three distributor connectors disconnected. It seems to be pointing to a) shorting causing ECU to drop signal, or b) bad ECU
Does anyone have a link to a pinout of the main wiring harnesses, specifically the one on the passenger side with the ignition signals.
Cheers
Member
Joined: Oct 2003
Posts: 3,702
Likes: 2
From: Fayettenam, Ar, US
Re: No power to igniter from ECU?? (wafro)
Throw a coil at it. Coil in cap setup is known to have overheated coils, probably the reason Honda changed the setup in 92.
FYI the ECU doesn't send the signal, it gets a pulse count signal from the dist. and then grounds a pin of the ignitor to let the coil fire the spark.
FYI the ECU doesn't send the signal, it gets a pulse count signal from the dist. and then grounds a pin of the ignitor to let the coil fire the spark.
Thread Starter
Joined: Aug 2006
Posts: 5
Likes: 0
From: Ottawa, ON, Canada
Re: No power to igniter from ECU?? (hondadude)
So I guess the Haynes manual is wrong again (it says battery voltage should be supplied on the yel/grn wire to the igniter KOEO) The helms manual does NOT say this, which made me think there is probably nothing wrong with the ECU. Helms manual just says to check the circuit from the yel/grn wire to the ECU.
The distributor subassembly and igniter were changed approx 4 years ago ~100k KM, the coil only reads 9.9kOhm between terminal A and secondary winding. That was close to around 72 degrees. I guess I will start with the coil
Thanks guys!
Cheers
The distributor subassembly and igniter were changed approx 4 years ago ~100k KM, the coil only reads 9.9kOhm between terminal A and secondary winding. That was close to around 72 degrees. I guess I will start with the coil
Thanks guys!
Cheers
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