Nissan Versa

 Sedan Service Manual

Engine » Engine control system (EC) » P0138 HO2s2
Component Inspection

1.INSPECTION START

Do you have CONSULT?

YES >> GO TO 2.

NO >> GO TO 3.

2.CHECK HEATED OXYGEN SENSOR 2

With CONSULT

1. Turn ignition switch ON and select "ENGINE" using CONSULT.
2. Select "DATA MONITOR" mode.
3. Start engine and warm it up to the normal operating temperature.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
6. Let engine idle for 1 minute.
7. Select "FUEL INJECTION" in "ACTIVE TEST" mode, and select "HO2S2 (B1)" as the monitor item with CONSULT.
8. Check "HO2S2 (B1)" at idle speed when adjusting "FUEL INJECTION" to +-25%.

"HO2S2 (B1)" should be above 0.68 V at least once when the "FUEL INJECTION" is +25%.

"HO2S2 (B1)" should be below 0.36 V at least once when the "FUEL INJECTION" is −25%.

Is the inspection result normal?

YES >> INSPECTION END

NO >> GO TO 6.

3.CHECK HEATED OXYGEN SENSOR 2I

Without CONSULT

1. Start engine and warm it up to the normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
4. Let engine idle for 1 minute.
5. Check the voltage between ECM harness connector terminals under the following condition.

Is the inspection result normal?

YES >> INSPECTION END

NO >> GO TO 4.

4.CHECK HEATED OXYGEN SENSOR 2II

Check the voltage between ECM harness connector terminals under the following condition.

Is the inspection result normal?

YES >> INSPECTION END

NO >> GO TO 5.

5.CHECK HEATED OXYGEN SENSOR 2III

Check the voltage between ECM harness connector terminals under the following condition.

Is the inspection result normal?

YES >> INSPECTION END

NO >> GO TO 6.

6.REPLACE HEATED OXYGEN SENSOR 2

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

CAUTION:

• Discard any heated oxygen 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 oxygen 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

DTC Logic

Component Function Check

Diagnosis Procedure

Component Inspection