2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 86Get this manual
Engine General Information and Diagnosis: Malfunction code C21 IAT sensor P0110 Detected item Detected failure condition Check for
C23 TO sensor P1651 C24 P0351 C31 P0705 C32 P0201 C41 Fuel pump relay Fuel injector Gear position signal Ignition signal
The sensor voltage should be the following0.2 sensor voltage4.9 IAT sensor, lead wirecoupler In other than the above range, C21 (P0110) is connectionindicatedIAT sensor circuit open or Sensor voltage is higher than specified valueground circuit openIAT sensor circuit shorted to Sensor voltage is lower than specified valuethe groundThe sensor voltage should be the following for secand more, after ignition switch is turned ONTO sensor, lead wirecoupler 0.2 sensor voltage4.7 connectionIn other than the above value, C23 (P1651) is indicatedTO sensor circuit shorted to Sensor voltage is higher than specified valueVCC or ground circuit openTO sensor circuit open or Sensor voltage is lower than specified valueshorted to the ground or VCC circuit openCKP sensor (pick-up coil) signal is produced, Ignition coil, wiringcoupler but signal from ignition coil is interrupted connection, power supply from times or more continuouslyIn this case, the the batterycode C24 (P0351) is indicatedGear position signal voltage should be higher than the following for seconds and moreGP switch, wiringcoupler Gear position sensor voltage 0.9 Vconnection, gearshift cam, etcIf lower than the above value, C31 (P0705) is indicatedCKP sensor (pick-up coil) signal is produced, Fuel injector, wiringcoupler but fuel injector signal is interrupted times or connection, power supply to more continuouslyIn this case, the code C32 the injector(P0201) is indicatedNo voltage is applied to the fuel pump, although fuel pump relay is turned ONFuel pump relay, lead wire NOTE The FP relay is incorporated in the ECMcoupler connection, power source to the fuel pump relay and fuel injectorsCooling fan relay, lead wire coupler connection