1990-1998 Arctic Cat Snowmobiles Repair Manual, Page 263Get this manual
FUEL SYSTEM-FUEL-INJECTED MODELS
3Remove the fasteners attaching the ECU mounting bracket4Tip the ECU mounting bracket forward, then remove the four screws attaching the ECU housing to the mounting bracket5Installation is the reverse of removal
7After assembly is complete, tum the ignition switch ON, but do not start the engineTurning on the ignition switch will energize the fuel pump for about seconds8Check for fuel leaksWARNING Do not start the engine if there is the slightest fuel leakAny leakage is hazardous
Changing the EPROM chip
Except for the Eraseable Programable Read Only Memory (EPROM) chip, individual components of the ECU are not available separately1Make sure the ignition switch is OFFDisconnect ground cable from the negative terminal of the battery2Remove the screws attaching the cover to the ECU housingOn 1996 and earlier models, see Figure 31On 1997 and later models, the cover is located under the ECU housingNOTE The cover may be sealed onto the housingDo not damage the cover or housing when removing