Reply To: GV650 EFI Wiring issues
I fear that we may possibly have to clean the ECU connectors hard , then dry it off , but the ECU only having a dry clean (air blast only) and try to see if we can use the service manual to trigger a blinking red FI light. It’s that Fi blinking confirms the communication to the ECU and it will tell us the code by either telling us the number on the dash or doing a series of sequence blinks (most likely)
Can you also try to trick the ECU to throw an error code to see why it is not sending sparks ?
Or although the stator shows good readings but could we have an internal fault with the pulse sensor of the stator unit , in such that it can’t tell the ECU’s how fast the drum is spinning, thefore the ECU can’t send the pulses to the Sparking Coils to light up the spark plugs
The ECU should be alive , as only the ECU triggers the pump to prime => which should mean its ready to go? but you have power to the coils which is strange , i would also see if changing the HT caps & HT wires makes any difference incase of an internal fault with the HT wire or HT cap itself.
The last thing to do is a long process of stripping the harness and using a meter to very every “end to end” connection is verified and there is no lost readings in any of the wires you probe to test (incase of a short somewhere along the harness or a broken internal wire that is not visible but the meter would say zero (ie. Fuel Gauge Connector to Dash board – the yellow wire is dead , so explains why the fuel gauge is not telling what fuel level is in the tank etc or the pins have oxidized too much, so need some rescue)