1990-1998 Arctic Cat Snowmobiles Repair Manual, Page 256Get this manual
CHAPTER SEVEN
depending on engine speedIf the following readings are indicated, replace the sensor: (32 F) at 0-3,000 rpm; 30 (86 F) at 3,000-5,000 rpm; 60 (140 F) over 5,000 rpm5Install new sensor if tests are much different than indicated in Table 36Apply Teflon tape to the threads of the sensor before installingAir temperature sensor-To test the inlet air temperature sensor (Figure 16, typical), make sure the engine is not running and ignition is off1Detach the electrical connectors from the sensor2Attach an ohmmeter to the sensor terminalsMeasure the resistance of the unit3Compare the measured resistance with the values in Table 4The temperature of the sensor should be as indicated4The condition of the intake air temperature sensor can also be checked by measuring the voltage using the Arctco analyzer (part No0644-212)aCompare the measured voltage with the values in Table 4bIf the indicated temperature is -40 and of, but the temperature is much different, the sensor has failedThe ECU automatically sets the temperature to -40 and of if the sensor fails5Install new sensor if tests are much different than indicated in Table 4Barometric pressure sensor-The barometric pressure sensor, an integral part of the ECU assembly, cannot be replaced separately1The condition of the barometric pressure sensor can be checked using the Arctco analyzer (part No0644-212)2Check with local weather service to obtain the current barometric pressure3Compare the barometric pressure indicated by the analyzer with the actual barometric pressure