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DTC P0037, P0038, P0057, P0058 HO2S2 HEATER EC-171 C D E F G H I J K L M A EC 2007 Pathfinder DTC P0037, P0038, P0057, P0058 HO2S2 HEATER PFP:226A0 Description UBS00K51 SYSTEM DESCRIPTION The ECM performs ON/OFF control of the heated oxygen sensor 2 heater corresponding to the engine speed, OPERATION CONSULT-II Reference Value in Data Monitor Mode UBS00K52 Specification data are reference values. On Board Diagnosis Logic UBS00K53 Sensor Input signal to ECM ECM function Actuator Camshaft position sensor (PHASE) Engine speed Heated oxygen sensor 2 Heated oxygen sensor 2 heater Engine coolant temperature sensor Engine coolant temperature Mass air flow sensor Amount of intake air Engine speed rpm Heated oxygen sensor 2 heater Above 3,600 OFF Below 3,600 rpm after the following conditions are met. ● Engine: After warming up ● Keeping the engine speed between 3,500 and 4,000 rpm for 1 ON MONITOR ITEM CONDITION SPECIFICATION HO2S2 HTR (B1) ● Engine speed: Below 3,600 rpm after the following conditions are met. – Engine: After warming up – Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and ON ● Engine speed: Above 3,600 rpm OFF DTC No. Trouble diagnosis name DTC detecting condition Possible cause P0037 Heated oxygen The current amperage in the heated oxygen sen- ● Harness or connectors ● Heater oxygen sensor 2 heater P0057 P0038 Heated oxygen The current amperage in the heated oxygen sen- ● Harness or connectors ● Heater oxygen sensor 2 heater P0058 |