P0137

DTC P0137 O2 SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 2)

OUTLINE OF DIAGNOSIS
Detect the malfunction of rear oxygen sensor open or short circuit. Judge NG when the rear oxygen sensor voltage may be abnormal from rear oxygen sensor voltage value with considering the conditions such as intake air amount, engine coolant temperature, main feedback control.




COMPONENT DESCRIPTION




ENABLE CONDITION (USED ONLY FOR MALFUNCTION JUDGMENT)

GENERAL DRIVING CYCLE
Perform the diagnosis once after starting the engine.

DIAGNOSTIC METHOD




- Abnormality Judgment
Judge NG when the malfunction criteria are completed.




- Normality Judgment
Judge OK when the malfunction criteria are 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)