Code No. P2252: Oxygen Sensor Offset Circuit Low Voltage




OPERATION




FUNCTION




TROUBLE JUDGEMENT


Check Conditions
Judgement Criterion

FAIL-SAFE AND BACKUP FUNCTION




PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. Check oxygen sensor (rear) itself.



  • Oxygen sensor (rear) connector check.
  • Oxygen sensor check (Refer to ).

Q. Is the check result normal?

Go to Step 2.
Repair or replace the connector, or replace the oxygen sensor (rear).

STEP 2. Perform voltage measurement at oxygen sensor (rear) connector.



  • Disconnect engine-ECU connector, and connect special tool power plant ECU check harness (MB992110) to measure at connector for inspection.
  • Power supply mode of electric motor switch: ACC
  • Voltage between terminal engine-ECU ORLE and body earth.
OK: 0.4 - 0.6 V

Q. Is the check result normal?

Go to Step 4.
Go to Step 3.

STEP 3. Check harness between oxygen sensor (rear) connector terminal and engine-ECU connector terminal ORLE.



  • Check earthing line for short circuit.

Q. Is the check result normal?

Go to Step 4.
Repair or replace the connector, or repair the damaged harness wire.

STEP 4. M.U.T.-III diagnosis code



  • Reconfirmation of diagnosis code.

Q. Is the diagnosis code stored?

Replace the engine-ECU.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).