Nissan Frontier D22. Manual - part 256

DTC P0031, P0032 HO2S1 HEATER

EC-127

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DTC Confirmation Procedure

UBS00D20

NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch OFF and wait at
least 5 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm battery voltage is more than 11V at idle.

 WITH CONSULT-II

1.

Start engine and warm it up to normal operating temperature.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Turn ignition switch ON and select “DATA MONITOR” mode with
CONSULT-II.

4.

Start engine and run it for at least 6 seconds at idle speed.

5.

If 1st trip DTC is detected, go to 

EC-129, "Diagnostic Procedure"

.

 WITH GST

1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Start engine and warm it up to normal operating temperature.

3.

Start engine and run it for at least 6 seconds at idle speed.

4.

Turn ignition switch OFF and wait least 5 seconds.

5.

Start engine and run it for at least 6 seconds at idle speed.

6.

Select “MODE 3” with GST.

7.

If DTC is detected, go to 

EC-129, "Diagnostic Procedure"

 .

●

When using GST, “DTC Confirmation Procedure” should be performed twice as much as when
using CONSULT-II because GST cannot display MODE 7 (1st trip DTC) concerning this diagnosis.
Therefore, using CONSULT-II is recommended.

SEF174Y

EC-128

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DTC P0031, P0032 HO2S1 HEATER

Wiring Diagram

UBS00D21

BBWA0436E

DTC P0031, P0032 HO2S1 HEATER

EC-129

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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

UBS00D22

1. 

CHECK POWER SUPPLY

1.

Turn ignition switch OFF.

2.

Disconnect heated oxygen sensor 1 harness connector.

3.

Turn ignition switch ON.

4.

Check voltage between terminal 1 and ground with CONSULT-II
or tester.

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 2.

2. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors M59, F27

●

15A fuse

●

Fuse block (J/B) connector M26

●

Harness for open or short between heated oxygen sensor 1 and 15A fuse

>> Repair harness or connectors.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

119

BR/Y

Heated oxygen sensor 1 
heater

[Engine is running]

●

Engine speed is below 3,600 rpm.

Approximately 0.4V

[Engine is running]

●

Engine speed is above 3,600 rpm.

BATTERY VOLTAGE
(11 - 14V)

BBIA0430E

Voltage

: Battery voltage

SEF213W

EC-130

[KA24DE]

DTC P0031, P0032 HO2S1 HEATER

3. 

CHECK OUTPUT SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between heated oxygen sensor 1 terminal 3 and ECM terminal 119.
Refer to Wiring Diagram.

4.

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

OK or NG

OK

>> GO TO 4.

NG

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

4. 

CHECK HEATED OXYGEN SENSOR 1 HEATER

Check resistance between terminals 3 and 1.

Check continuity between terminals 2 and 1, 3 and 2.

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 sur-
face 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.

OK or NG

OK

>> GO TO 5.

NG

>> Replace heated oxygen sensor 1.

5. 

CHECK INTERMITTENT INCIDENT

Perform 

EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END.

Removal and Installation

UBS00D23

HEATED OXYGEN SENSOR 1

Refer to 

EM-13, "OUTER COMPONENT PARTS"

 .

Continuity should exist.

Resistance

: 3.3 - 4.0 

Ω [at 25°C (77°F)]

Continuity should not exist.

SEF220W