2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 104Get this manual
Engine General Information and Diagnosis:
DTC "C17" (P1750-HL): IAP Sensor Circuit Malfunction
Detected condition and possible cause Detected condition IAP sensor voltage is not within the following range0.2 Sensor voltage4.1 NOTE C17 Note that atmospheric pressure varies depending on weather conditions as well as altitudeTake that into consideration when inspecting voltageSensor voltage is higher than specified valueSensor voltage is lower than specified value
B933H21104013
Possible cause Clogged vacuum passage between throttle body and IAP sensor Air being drawn from vacuum passage between throttle body and IAP sensor IAP sensor circuit open or shorted to the ground IAP sensor malfunction ECM malfunction