Code No. P2253: Oxygen Sensor Offset Circuit High Voltage




OPERATION




FUNCTION




TROUBLE JUDGEMENT


Check Condition
Judgement Criterion
FAIL-SAFE AND BACKUP FUNCTION

PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. Check oxygen sensor (front) itself.



  • Oxygen sensor check (Refer to ).

Q. Is the check result normal?

YES : Go to Step 2.
Replace the oxygen sensor (front).

STEP 2. Check oxygen sensor (rear) itself.



  • Oxygen sensor check (Refer to ).

Q. Is the check result normal?

Go to Step 3.
Replace the oxygen sensor (rear).

STEP 3. Perform voltage measurement at engine-ECU connector.



  • Measure engine-ECU terminal voltage.
  • Ignition switch: ON
  • Voltage between terminal OFLE line and earth.
OK: 0.4 - 0.6 V

Q. Is the check result normal?

Go to Step 7.
Go to Step 4.

STEP 4. Check of short to power supply in OFLE line between oxygen sensor (front) connector and engine-ECU connector.


Q. Is the check result normal?

Go to Step 5.
Repair the connector(s) or wiring harness.

STEP 5. Check of short to power supply line in O2FL line between oxygen sensor (front) connector and engine-ECU connector.


Q. Is the check result normal?

Go to Step 6.
Repair the connector(s) or wiring harness.

STEP 6. M.U.T.-III diagnosis code



  • Reconfirmation of diagnosis code.

Q. Is the diagnosis code set?

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

STEP 7. Perform voltage measurement at engine-ECU connector.



  • Measure engine-ECU terminal voltage.
  • Ignition switch: ON
  • Voltage between terminal ORLE line and earth.
OK: 0.4 - 0.6 V

Q. Is the check result normal?

Go to Step 6.
Go to Step 8.

STEP 8. Check of short to power supply in ORLE line between oxygen sensor (rear) connector and engine-ECU connector.


Q. Is the check result normal?

Go to Step 9.
Repair the connector(s) or wiring harness.

STEP 9. Check of short to power supply in O2RL line between oxygen sensor (rear) connector and engine-ECU connector.


Q. Is the check result normal?

Go to Step 6.
Repair the connector(s) or wiring harness.





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