Code No. P0037: Right Bank Oxygen Sensor (rear) Heater Circuit Low Input




OPERATION




FUNCTION




TROUBLE JUDGEMENT


Check Conditions
Judgement Criterion
Check Conditions
Judgement Criterion

FAIL-SAFE AND BACKUP FUNCTION




PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. Check right bank oxygen sensor (rear) itself.



  • Right bank oxygen sensor (rear) check (Refer to ).

Q. Is the check result normal?

Go to Step 2.
Replace the right bank oxygen sensor (rear).

STEP 2. Voltage measurement at right bank oxygen sensor (rear) connector (power supply line).


(1)Disconnect the connector, and measure at the wiring harness side.
(2)Ignition switch: "ON"
(3)Check the voltage between the right bank oxygen sensor (rear) connector (power supply line) and body earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 3.

    Repair or replace the connector(s), or check and repair the harness of short to earth, and open circuit in power supply line between right bank oxygen sensor (rear) connector and engine control relay connector.

STEP 3. Check of short to earth, open circuit and damage in OHRR line between right bank oxygen sensor (rear) connector and engine-ECU connector.


Q. Is the check result normal?

Go to Step 4.
Repair the connector(s) or wiring harness.

STEP 4. Check of harness damage in power supply line between right bank oxygen sensor (rear) connector and engine control relay connector.


Q. Is the check result normal?

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

STEP 5. M.U.T.-III diagnosis code



  • Reconfirmation of diagnosis code.

Q. Is 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 ).





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