So how that diode works on the cbr is the diode puts out exactly 9v in the initial start up , the ECM receives the 9v in a sort of handshake. After the ECM receives the "handshake" the fuel pump will be triggered. After the bike starts the diode will no longer be required, the handshake will be valid for 30 seconds after the bike is still shut off.
When the diode blows in the ignition from hotwiring it is caused by the 12v constant power to the ignition being supplied reverse into the diode when it is meant to supply the 9v conversion to the ecm.
This will also cause the main fuse behind the air filter to blow.
When the diode has failed it can be emulated with a regular 9v battery from the positive (+) battery terminal on the 9v to the orange wire (cbr300) or the pink wire (cbr250) and the negative(-) terminal on the 9v to the negative 12v battery terminal.
This will mimic the diode. Causing the Fuel pump to engage.
Please correct me if I am wrong but my bike was once successfully stolen and never started.
Also you can mimic the diode with the 9v battery and then use a toggle for the two other wires to the ignition. These ignitions are a hassle to replace because of the headless bolts I believe.
Last edited by imilatz; 12-05-2015 at 07:34 PM.