P0037

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

1. OUTLINE OF DIAGNOSIS
Detect oxygen sensor heater open or short circuit.
The oxygen sensor heater performs duty control, and the output terminal voltage at ON is 0 V, and the output terminal voltage at OFF is the battery voltage.
Judge as NG when the terminal voltage remains Low.




2. COMPONENT DESCRIPTION




3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE
Perform the diagnosis continuously after starting the engine.

5. DIAGNOSTIC METHOD




Abnormality Judgment
Judge as NG when the continuous time while meeting all of the malfunction criteria below is more than 2560 milliseconds (10 cycles).




Normality Judgment
Judge as OK and clear the NG when the malfunction criteria below are completed.

6. DTC CLEAR CONDITION
- When the OK idling cycle is completed 40 times in a row
- When "clear Memory" is performed

7. MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
- When the OK driving cycle is completed 3 times in a row
- When "clear Memory" is performed

8. FAIL SAFE
Sub feedback control: Not allowed.

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