P0037

DTC P0037 - HO2S HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 2)

OUTLINE OF DIAGNOSIS
Detect open or short circuit of rear oxygen sensor heater. Rear oxygen sensor heater conducted the duty control, and the output terminal voltage at ON is 0 V seconds and the output terminal voltage at OFF is the battery voltage. Judge NG when the terminal voltage remains Low.




COMPONENT DESCRIPTION




ENABLE CONDITION

GENERAL DRIVING CYCLE
Perform the diagnosis continuously after engine starting.

DIAGNOSTIC METHOD




Judge NG when the continuous time of completing the malfunction criteria becomes more than 5 seconds. Judge OK and clear the NG when the malfunction criteria are not completed.

DTC CLEAR CONDITION
- When the OK idling cycle was completed 40 times in a row
- When "Clear Memory" was performed

MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
- When the OK driving cycle was completed 3 times in a row
- When "Clear Memory" was performed

FAIL SAFE
Sub feedback control: Not allowed

ECM OPERATING AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)