Code No. P2251: Linear A/F Sensor COM Line (open)




OPERATION


The linear A/F sensor and the engine-ECU are connected by the following 3 lines to detect the air-fuel ratio.


FUNCTION




TROUBLE JUDGEMENT


Check Conditions
Judgement Criteria

FAIL-SAFE AND BACKUP FUNCTION




PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. Check harness between linear A/F sensor connector terminal and engine-ECU connector terminal LEFL.



  • Check signal line for open circuit.

Q. Is the check result normal?

Go to Step 2.
Repair or replace the connector, or repair the damaged harness wire.

STEP 2. Replace the linear A/F sensor



  • After replacing the linear A/F sensor, reconfirm whether the diagnosis code is stored.

Q. Is the diagnosis code stored?

Replace the engine-ECU.
Check end.