06-13-2019, 02:29 AM
Thanks Quintastic, Flynrider pointed out something interesting, normally when the red "engine stop switch" on the right handlebars is off whilst switching the ignition key on the meters sweep because their internal processor in the meter cluster is stepping through the startup procedure independent of the electronic control module on the bike.
However the pump does not prime ( the sound you cannot hear at the moment ) and the orange " check engine light" stays off, this is important!
If the red e.stop switch is functioning correctly and is in the normal ON ( run ) position, the orange c.e.light lights up for the amount of time the fuel pump primes and dims again.
This indicates that the 12v. is supplied TO the e.c.m. and the fuel pump relay.
The next thing that happens is the fuel pump relay is commanded ON for 2 seconds to pressurize the fuel system by the e.c.m., it then switches the fuel pump relay off and waits for the engine to start and meter x amount of fuel through the injectors before it switches the fuel pump on and off again depending on how much fuel the e.c.m. "thinks" it has metered out and repeats this to keep the engine supplied with sufficient fuel pressure.
So if in your case the pump does not run check if the orange c.e.light is on and next listen if the relay in the fuse-box under the seat ( the rear one ) clicks on and off when the ihnition key is switched on, you may be able to hear/feel it.
![[Image: eecd28df14e2963cf658ea86455f856b.jpg]](https://cb1100forum.net/forum/uploads/imp/201906/eecd28df14e2963cf658ea86455f856b.jpg)
As long as the green neutral light is lit the sidestand switch is not used for safety, the engine ignores it's position until the gearbox is engaged and the green neutral light is off.
If the orange light remains off it means the 12v supply to the fuel relay is not present.
Causes for this are;
1; red engine cutoff switch, ( some members have experienced this ).
2; bank angle sensor or;
3; engine cutoff relay; in that order.
Hope that helps to find out which part is causing the fuel pump to remain silent, the fuel cutoff relay is capable of switching 25 Amps and is used in a lot of vehicles as a standard relay, the fuel pump uses slightly more that 3 Amps so normally it should have a long life expectancy.
However the pump does not prime ( the sound you cannot hear at the moment ) and the orange " check engine light" stays off, this is important!
If the red e.stop switch is functioning correctly and is in the normal ON ( run ) position, the orange c.e.light lights up for the amount of time the fuel pump primes and dims again.
This indicates that the 12v. is supplied TO the e.c.m. and the fuel pump relay.
The next thing that happens is the fuel pump relay is commanded ON for 2 seconds to pressurize the fuel system by the e.c.m., it then switches the fuel pump relay off and waits for the engine to start and meter x amount of fuel through the injectors before it switches the fuel pump on and off again depending on how much fuel the e.c.m. "thinks" it has metered out and repeats this to keep the engine supplied with sufficient fuel pressure.
So if in your case the pump does not run check if the orange c.e.light is on and next listen if the relay in the fuse-box under the seat ( the rear one ) clicks on and off when the ihnition key is switched on, you may be able to hear/feel it.
As long as the green neutral light is lit the sidestand switch is not used for safety, the engine ignores it's position until the gearbox is engaged and the green neutral light is off.
If the orange light remains off it means the 12v supply to the fuel relay is not present.
Causes for this are;
1; red engine cutoff switch, ( some members have experienced this ).
2; bank angle sensor or;
3; engine cutoff relay; in that order.
Hope that helps to find out which part is causing the fuel pump to remain silent, the fuel cutoff relay is capable of switching 25 Amps and is used in a lot of vehicles as a standard relay, the fuel pump uses slightly more that 3 Amps so normally it should have a long life expectancy.