Code No. P2253: Oxygen Sensor Offset Circuit High Voltage <Except low CO2 specification, FFV>








OPERATION



FUNCTION



TROUBLE JUDGMENT


Check Condition
Judgement Criterion

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-45 oxygen sensor (front) connector and D-31 oxygen sensor (rear) connector

Q. Are the check results normal?
Go to Step 2 .
Repair or replace the connector.

STEP 2. Check oxygen sensor (front) itself.

  • Check oxygen sensor (front) itself (Refer to ).

Q. Is the check result normal?
Go to Step 3 .
Replace the oxygen sensor (front).

STEP 3. Check oxygen sensor (rear) itself.

  • Check oxygen sensor (rear) itself (Refer to ).

Q. Is the check result normal?
Go to Step 4 .
Replace the oxygen sensor (rear).

STEP 4. Connector check: B-08 engine-ECU connector

Q. Is the check result normal?
Go to Step 5 .
Repair or replace the connector.

STEP 5. Perform voltage measurement at B-08 engine-ECU connector.

  • Disconnect engine-ECU connector, and connect special tool power plant ECU check harness (MB992110) to measure at connector for inspection.
  • Ignition switch: ON
  • Voltage between terminal No. 39 and earth.
OK: 0.4 - 0.6 V

Q. Is the check result normal?
Go to Step 9 .
Go to Step 6 .

STEP 6. Check harness between C-45 (terminal No. 4) oxygen sensor (front) connector and B-08 (terminal No. 39) engine-ECU connector.
note Before checking harness, check intermediate connector A-11, and repair if necessary.

  • Check earthing line for short circuit.

Q. Is the check result normal?
Go to Step 7 .
Repair the damaged harness wire.

STEP 7. Check harness between C-45 (terminal No. 3) oxygen sensor (front) connector and B-08 (terminal No. 38) engine-ECU connector.
note Before checking harness, check intermediate connector A-11, and repair if necessary.

  • Check output line for short circuit.

Q. Is the check result normal?
Go to Step 8 .
Repair the damaged harness wire.

STEP 8. 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 9. Perform voltage measurement at B-08 engine-ECU connector.

  • Disconnect engine-ECU connector, and connect special tool power plant ECU check harness (MB992110) to measure at connector for inspection.
  • Ignition switch: ON
  • Voltage between terminal No. 41 and earth.
OK: 0.4 - 0.6 V

Q. Is the check result normal?
Go to Step 8 .
Go to Step 10 .

STEP 10. Check harness between D-31 (terminal No. 4) oxygen sensor (rear) connector and B-08 (terminal No. 41) engine-ECU connector.
note Before checking harness, check intermediate connectors A-11 and C-29, and repair if necessary.

  • Check earthing line for short circuit.

Q. Is the check result normal?
Go to Step 11 .
Repair the damaged harness wire.

STEP 11. Check harness between D-31 (terminal No. 3) oxygen sensor (rear) connector and B-08 (terminal No. 40) engine-ECU connector.
note Before checking harness, check intermediate connectors A-11 and C-29, and repair if necessary.

  • Check output line for short circuit.

Q. Is the check result normal?
Go to Step 8 .
Repair the damaged harness wire.

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