2008 Polaris Sportsman 500 EFI/X2/Touring/500 H.O. Service Manual, Page 353Get this manual
ELECTRICAL RELAYS
OperationEFI Models
The relays, located next to the ECU, assist with component operation such as the fan, fuel pump, etcThe fan relay, controlled by the ECU, operates the fanThe ECU relay, controlled by the key switch, operates the ECU The Ignition Coil and Fuel Pump relay, controlled by the ECU, turns on power for components such as the fuel pump, injectors, etcThe differential relay, controlled by the AWD switch and ECU, operates the differential solenoidGrayBlack COLOR RedWhite
ECU RELAY
FUNCTION KEY-ON Battery power supply, switched on by the key and LH control switches, enables power to relayRelay "ON" commandThe ECU supplies ground which closes the relay, supplying power to run the fuel pump, injectors, etcFused 15-amp, unswitched battery power IN supply for EFI component operationEFI power output'ON' when ECU sends signal on the GRYW wire, closing the relaySupplies 15-amp power for ECUoperation of EFI components
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