Toyota
Nissan Versa
 Sedan Service Manual
Engine » Engine control system (EC) » P0139 HO2s2
Diagnosis Procedure

1.CHECK GROUND CONNECTION

  1. Turn ignition switch OFF.
  2. Check ground connection E15. Refer to Ground Inspection in GI, "Circuit Inspection".

Is the inspection result normal?

YES >> GO TO 2.

NO >> Repair or replace ground connection.

2.CLEAR THE MIXTURE RATIO SELFLEARNING VALUE

  1. Clear the mixture ratio selflearning value. Refer to EC, "Work Procedure".
  2. Run engine for at least 10 minutes at idle speed.

Is the 1st trip DTC P0171 or P0172 detected? Is it difficult to start engine?

YES >> Perform trouble diagnosis for DTC P0171 or P0172. Refer to EC, "DTC Logic" or EC, "DTC Logic".

NO >> GO TO 3.

3.CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT

  1. Turn ignition switch OFF.
  2. Disconnect heated oxygen sensor 2 (HO2S2) harness connector.
  3. Disconnect ECM harness connector.
  4. Check the continuity between HO2S2 harness connector and ECM harness connector.

CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT

    5.   Also check harness for short to ground and short to power.

Is the inspection result normal?

YES >> GO TO 4.

NO >> Repair open circuit or short to ground or short to power in harness or connectors.

4.CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

    1.   Check the continuity between HO2S2 harness connector and ECM harness connector.

CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

    2.   Check the continuity between HO2S2 harness connector or ECM harness connector and ground.

CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

    3.   Also check harness for short to power.

Is the inspection result normal?

YES >> GO TO 5.

NO >> Repair open circuit or short to ground or short to power in harness or connectors.

5.CHECK HEATED OXYGEN SENSOR 2

Refer to EC, "Component Inspection".

Is the inspection result normal?

YES >> GO TO 6.

NO >> Replace heated oxygen sensor 2. Refer to EX, "Exploded View".

6.CHECK INTERMITTENT INCIDENT

Refer to GI, "Intermittent Incident".

>> INSPECTION END

    More about «P0139 HO2s2»:

    DTC Logic

    Component Function Check

    Diagnosis Procedure

    Component Inspection

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