P0150

DTC P0150 - O2 SENSOR CIRCUIT (BANK 1 SENSOR 1)

OUTLINE OF DIAGNOSIS
Detect the short circuit of front oxygen (A/F) sensor heater. Diagnosis is performed using front oxygen (A/F) sensor IC, and communication is established between front oxygen (A/F) sensor IC and main IC. Front oxygen (A/F) sensor judges NG when the data of voltage (AFC, AFV) is abnormal.




COMPONENT DESCRIPTION




ENABLE CONDITION

GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.

DIAGNOSTIC METHOD




Front oxygen (A/F) sensor judges NG when the continuous time of completing the malfunction criteria becomes more than the time needed for diagnosis (4.6 seconds). Front oxygen (A/F) sensor judges OK and clear 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
- Front oxygen (A/F) sensor IC communication: Not allowed to communicate
- Front oxygen (A/F) sensor main learning correction: Not allowed to calculate
- Correction when re-starting at high temperature: Normally minimum value 0.06 -> 0
- Purge control: Not allowed to purge

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