Toyota
Nissan Versa
 Sedan Service Manual
Engine » Engine control system (EC) » P0037, P0038 HO2s2 heater
Diagnosis Procedure

1.CHECK HO2S2 POWER SUPPLY CIRCUIT

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

CHECK HO2S2 POWER SUPPLY CIRCUIT

Is the inspection result normal?

YES >> GO TO 2.

NO >> Repair or replace errordetected parts.

2.CHECK HO2S2 OUTPUT SIGNAL CIRCUIT

  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Check the continuity between HO2S2 harness connector and ECM harness connector.

CHECK HO2S2 OUTPUT SIGNAL CIRCUIT

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

Is the inspection result normal?

YES >> GO TO 3.

NO >> Repair or replace errordetected parts.

3.CHECK HEATED OXYGEN SENSOR 2 HEATER

Check the heated oxygen sensor 2 heater. Refer to EC, "Component Inspection".

Is the inspection result normal?

YES >> Check intermittent incident. Refer to GI, "Intermittent Incident".

NO >> GO TO 4.

4.REPLACE HEATED OXYGEN SENSOR 2

Replace heated oxygen sensor 2. Refer to EX, "Exploded View".

CAUTION: - Discard any sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.

- Before installing new sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner [commercial service tool (J4389718 or J4389712)] and approved Antiseize Lubricant (commercial service tool).

>> INSPECTION END

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