02-08-19, 01:23 PM
I made a simplified version of the Haynes wiring diagram, only showing things relevant for the ignition/starter/fuel pump/etc (can't seem to upload it right now)... and now I think I get it:
Spark requires ECU ground via alarm SS pins, which go to ignition switch, then to diode box, and to ground via side stand switch (when up) or neutral switch (when in neutral).
Starter requires starter cut-off relay to be grounded via neutral switch (in neutral), or clutch switch, then side stand switch (side stand up AND clutch lever pulled in).
I've confirmed the switched ground at the ECU is only grounded when the ignition is switched on AND the immobiliser is disarmed.
So I think that leaves me with the following possibilities:
- Break between kill switch and ignition coils
- Break in any ECU wires
- Break in wire from SS- to ignition
- Break in wire from ignition to diode box
- Fault in immobiliser/alarm
- Fault in ECU
- Fault in crank sensor
- Fault in diode box?!
The diagram also shows a wire from the neutral switch to the ECU, no idea what function that serves.
Spark requires ECU ground via alarm SS pins, which go to ignition switch, then to diode box, and to ground via side stand switch (when up) or neutral switch (when in neutral).
Starter requires starter cut-off relay to be grounded via neutral switch (in neutral), or clutch switch, then side stand switch (side stand up AND clutch lever pulled in).
I've confirmed the switched ground at the ECU is only grounded when the ignition is switched on AND the immobiliser is disarmed.
So I think that leaves me with the following possibilities:
- Break between kill switch and ignition coils
- Break in any ECU wires
- Break in wire from SS- to ignition
- Break in wire from ignition to diode box
- Fault in immobiliser/alarm
- Fault in ECU
- Fault in crank sensor
- Fault in diode box?!
The diagram also shows a wire from the neutral switch to the ECU, no idea what function that serves.