2006-2008 Polaris Snowmobiles FS/FST Service Manual., Page 302Get this manual
Chassis Electrical System and FST snowmobilesThese sequences are critical to the starting and stopping process and should be used in any troubleshooting methods2
Operator moves the key to the "START" positionThis action supplies battery voltage to the ECU (PIN 206)In order for the starter motor to engage, the safety slap switch must be in the "UP" positionIf the safety slap switch is in the "DOWN" position, the ECU will not engage the starter motorWith the key turned to "START" and the safety slap switch in the "UP" position, the ECU will activate the EFI relay via PIN 322Power to the EFI relay is supplied directly from the batteryThe ECU will then activate the ignition relay, fuel pump relay, and the ground side of the start relayThe start relay provides the ground path for the starter motor solenoidThe engine should turnover and start at this pointThe chassis relay is activated once the ECU determines the engine can maintain sufficient engine RPM to compensate for the increased electrical loadsThe chassis relay supplies power to the lights, power points,