P0031

DTC P0031 - HO2S HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 1)

OUTLINE OF DIAGNOSIS
Detect the open or short circuit of front oxygen (A/F) sensor heater.
Diagnosis is performed using A/F microcomputer, and communication is established between A/F microcomputer and main microcomputer. Judge NG when the data of open circuit and shortage NG is transmitted.




COMPONENT DESCRIPTION




ENABLE CONDITION

GENERAL DRIVING CYCLE
Terminate the diagnosis if the open or short circuit becomes NG once by performing diagnosis continuously.

DIAGNOSTIC METHOD




Judge NG when the continuous time of completing all the malfunction criteria becomes more then 4.5 seconds.

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
None

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