Nissan Frontier D22. Manual - part 277

DTC P0138 HO2S2

EC-211

[KA24DE]

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EC

Wiring Diagram

UBS00D4N

BBWA1057E

EC-212

[KA24DE]

DTC P0138 HO2S2

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

Diagnostic Procedure

UBS00D4O

1. 

RETIGHTEN GROUND SCREWS

1.

Turn ignition switch OFF.

2.

Loosen and retighten engine ground screws.

>> GO TO 2.

2. 

CHECK INPUT SIGNAL CIRCUIT

1.

Disconnect heated oxygen sensor 2 harness connector and ECM harness connector.

2.

Check harness continuity between ECM terminal 56 and HO2S2 terminal 1.
Refer to Wiring Diagram.

3.

Check harness continuity between ECM terminal 56 or HO2S2 terminal 1 and ground.
Refer to Wiring Diagram.

4.

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

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors M58, F28

●

Harness for open or short between heated oxygen sensor 2 and ECM

>> Repair open circuit or short to ground or short to power in harness or connectors.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

56

OR

Heated oxygen sensor 2

[Engine is running]

●

Warm-up condition

●

Revving engine from idle up to 3,000 rpm 
quickly after the following conditions are met.

–

Keeping the engine speed between 3,500 and 
4,000 rpm for 1 minute and at idle for 1 minute 
under no load

0 - Approximately 1.0V

BBIA0431E

Continuity should exist.

Continuity should not exist.

DTC P0138 HO2S2

EC-213

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4. 

CHECK GROUND CIRCUIT

1.

Check harness continuity between heated oxygen sensor 2 terminal 4 and engine ground.
Refer to Wiring Diagram.

2.

Also check harness for short to power.

OK or NG

OK

>> GO TO 6.

NG

>> GO TO 5.

5. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors M58, F28

●

Harness for open or short between heated oxygen sensor 2 and engine ground

>> Repair open circuit or short to power in harness or connectors.

6. 

CHECK HARNESS CONNECTOR

Check heated oxygen sensor 2 harness connector for water.
Water should not exist. 

OK or NG

OK

>> GO TO 7.

NG

>> Repair or replace harness connector.

7. 

CHECK HEATED OXYGEN SENSOR 2

Refer to 

EC-213, "Component Inspection"

OK or NG

OK >> GO 

TO 

8.

NG

>> Replace heated oxygen sensor 2.

8. 

CHECK INTERMITTENT INCIDENT

Perform 

EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END.

Component Inspection

UBS00D4P

HATED OXYGEN SENSOR 2

 With CONSULT-II

1.

Reconnect all harness connectors disconnected.

2.

Start engine and warm it up to the normal operating temperature.

3.

Turn ignition switch OFF and wait at least 5 seconds.

4.

Start engine and keep engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

5.

Let engine idle for 1 minute.

Continuity should exist.

EC-214

[KA24DE]

DTC P0138 HO2S2

6.

Select “FUEL INJECTION” in “ACTIVE TEST” mode, and select
“HO2S2 (B1)” as the monitor item with CONSULT-II.

7.

Check “HO2S2 (B1)” at idle speed when adjusting “FUEL INJECTION” to 

±25%.

“HO2S2 (B1)” should be above 0.68V at least once when the “FUEL INJECTION” is +25%. “HO2S2
(B1)” should be below 0.55V at least once when the “FUEL INJECTION” is 

−25%.

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 tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

 Without CONSULT-II

1.

Reconnect all harness connectors disconnected.

2.

Start engine and warm it up to the normal operating temperature.

3.

Turn ignition switch OFF and wait at least 5 seconds.

4.

Start engine and keep engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

5.

Let engine idle for 1 minute.

6.

Set voltmeter probes between ECM terminals 56 (Heated oxy-
gen sensor 2 signal) and engine ground.

7.

Check the voltage when revving up to 4,000 rpm under no load
at least 10 times.
(Depress and release accelerator pedal as soon as possible.)
The voltage should be above 0.68V at least once.
If the voltage is above 0.68V at step 4, step 5 is not neces-
sary.

8.

Check the voltage when revving up to 5,000 rpm under no load.
Or keep vehicle at idling for 10 minutes, then check the voltage.
Or check the voltage when coasting from 80 km/h (50 MPH) in
3rd gear position (M/T), D position with “OD” OFF (A/T).
The voltage should be below 0.55V at least once.

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 tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

SEF662Y

PBIB2169E

AEC874A