01-29-2020, 01:30 AM
From what you are measuring it appears you are correct, the circuit is open, the coil cannot "generate" the ac signal the ecu needs to determine at what time
the spark fires and also the fuel injection operation, it stops both functions.
These two are exactly the symptoms you have and as far as i can tell this is the only part on the bike that can cause this fault.
But like i said it only happens in very few cases, it seems a robust system that has to operate at hot temperatures that is not good
for the life of electronic parts so the coil is a good solution.
Here is what a reluctor sensor looks like inside;
1= the coil.
2= soft iron core.
3=permanent magnet.
If a ferrous metal moves past the tip of the sensor it generates an ac voltage as a result
of the magnetic field variation through the soft iron core
To verify if the ecu is ok you can measure the connector pin that would have the yellow wire in it.
in my case i measured 0.3 volts dc on it, you may measure a higher value but it shows
that the ecu is connected and the input is working, measured with the key on.
So if you are convinced that the coil is defective then you have to replace it, this coil is used on a wide variety of honda engines, but you need one that has the right type of connector, grommet with right angle rubber boot and correct length of cable to match your bike.
here is a picture of the page with the partnumber seven;
And a link to partsfish for that page, it has pricing and partnumbers;
https://www.partsfish.com/oemparts/a/hon...case-cover
And what it looks like without the cover and sensor;
It is not difficult to replace it and for someone like yourself that should be simple to do.
There is an opening in the lower crankcase as far as i can tell so maybe the oil is below that level when the bike is on the sidestand but i am not sure, the sight glass with the oil level suggests that
the oil is below the cover and there seems to be no gasket as a spare part.
So some type of silicone sealant appears to be required similat to what you did with the valve cover, maybe someone with a service manual can explain.
the spark fires and also the fuel injection operation, it stops both functions.
These two are exactly the symptoms you have and as far as i can tell this is the only part on the bike that can cause this fault.
But like i said it only happens in very few cases, it seems a robust system that has to operate at hot temperatures that is not good
for the life of electronic parts so the coil is a good solution.
Here is what a reluctor sensor looks like inside;
1= the coil.
2= soft iron core.
3=permanent magnet.
If a ferrous metal moves past the tip of the sensor it generates an ac voltage as a result
of the magnetic field variation through the soft iron core
To verify if the ecu is ok you can measure the connector pin that would have the yellow wire in it.
in my case i measured 0.3 volts dc on it, you may measure a higher value but it shows
that the ecu is connected and the input is working, measured with the key on.
So if you are convinced that the coil is defective then you have to replace it, this coil is used on a wide variety of honda engines, but you need one that has the right type of connector, grommet with right angle rubber boot and correct length of cable to match your bike.
here is a picture of the page with the partnumber seven;
And a link to partsfish for that page, it has pricing and partnumbers;
https://www.partsfish.com/oemparts/a/hon...case-cover
And what it looks like without the cover and sensor;
It is not difficult to replace it and for someone like yourself that should be simple to do.
There is an opening in the lower crankcase as far as i can tell so maybe the oil is below that level when the bike is on the sidestand but i am not sure, the sight glass with the oil level suggests that
the oil is below the cover and there seems to be no gasket as a spare part.
So some type of silicone sealant appears to be required similat to what you did with the valve cover, maybe someone with a service manual can explain.