2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 116Get this manual
Engine General Information and Diagnosis:
DTC "C23" (P1651-HL): TO Sensor Circuit Malfunction
Detected condition and possible cause Detected condition The sensor voltage should be the following for secand more, after ignition C23 switch is turned ON0.2 Sensor voltage4.7 Sensor voltage is higher than specified valueP1651 Sensor voltage is lower than specified valueWiring diagram
TO sensor BrW BBr ECM 13 VCC 10 TOS 24 E2
B933H21104015
Possible cause TO sensor circuit open or short TO sensor malfunction ECM malfunction TO sensor circuit open or shorted to VCC or ground circuit open TO sensor circuit shorted to ground or VCC circuit open