2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 111Get this manual
1A-47 Engine General Information and Diagnosis:
DTC "C21" (P0110-HL): IAT Sensor Circuit Malfunction
Detected condition and possible cause Detected condition Possible cause Output voltage is not with in the following IAT sensor circuit open or shortrangeC21 IAT sensor malfunction0.2 Sensor voltage4.9 ECM malfunctionSensor voltage is higher than specified IAT sensor circuit open or ground circuit openH valueP0110 Sensor voltage is lower than specified IAT sensor circuit shorted to the groundL valueWiring diagram