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Nissan Frontier D22. Manual - part 274

DTC P0133 HO2S1

EC-199

[KA24DE]

10.

CHECK FRONT HEATED OXYGEN SENSOR

Refer to

EC-199, "Component Inspection"

OK or NG

>> GO TO 11.

>> Replace heated oxygen sensor 1.

11.

CHECK INTERMITTENT INCIDENT

Refer to

EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

>> INSPECTION END.

Component Inspection

UBS00D48

HEATED OXYGEN SENSOR 1

With CONSULT-II

Reconnect all harness connectors disconnected.

Start engine and warm it up to normal operating temperature.

Select “MANU TRIG” in “DATA MONITOR” mode, and the trig-
ger point is adjusted to 100%.

Select “HO2S1 (B1)” and “HO2S1 MNTR (B1)” in item selection.

Hold engine speed at 2,000 rpm under no load during the follow-
ing steps.

Touch “START” on CONSULT-II screen.

Check the following.

–

“HO2S1 MNTR (B1)” in “DATA MONITOR” mode changes from
“RICH” to “LEAN” to “RICH” 5 times in 10 seconds.
5 times (cycles) are counted as shown below:

–

“HO2S1 (B1)” voltage goes above 0.6V at least once.

–

“HO2S1 (B1)” voltage goes below 0.3V at least once.

–

“HO2S1 (B1)” voltage never exceeds 1.0V.

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.

SEF646Y

SEF217YA

SEF648Y

EC-200

[KA24DE]

DTC P0133 HO2S1

Without CONSULT-II

Reconnect all harness connectors disconnected.

Start engine and warm it up to normal operating temperature.

Set voltmeter probes between ECM terminal 50 [Heated oxygen
sensor 1 signal] and engine ground.

Check the following with engine speed held at 2,000 rpm con-
stant under no load.

–

The voltage fluctuates between 0 to 0.3V and 0.6 to 1.0V more
than five times within 10 seconds.
1 time: 0 - 0.3V

→ 0.6 - 1.0V → 0 - 0.3V

2 times: 0 - 0.3V

→ 0.6 - 1.0V → 0 - 0.3V → 0.6 - 1.0V → 0 -

0.3V

–

The maximum voltage is over 0.6V at least 1 time.

–

The minimum voltage is below 0.3V at least 1 time.

–

The voltage never exceeds 1.0V.

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.

MASS AIR FLOW SENSOR

Turn ignition switch ON.

Start engine and warm it up to normal operating temperature.

Check voltage between ECM terminal 54 (Mass air flow sensor
signal) and ground.

*: Check for linear voltage rise in response to increases to about 4,000 rpm in
engine speed.

If the voltage is out of specification, disconnect mass air flow sensor harness connector and connect it
again. Repeat above check.

If NG, remove mass air flow sensor from air duct. Check hot wire
for damage or dust.

PCV VALVE

With engine running at idle, remove PCV valve from breather separator.

AEC873A

Conditions

Voltage [V]

Ignition switch ON (Engine stopped.)

Less than 1.0

Idle (Engine is warmed-up to normal
operating temperature.)

0.9 - 1.8

2,500 rpm (Engine is warmed-up to nor-
mal operating temperature.)

1.9 - 2.3

Idle to about 4,000 rpm*

1.3 - 1.7 to Approx. 3.0

SEF326V

SEF893J

DTC P0133 HO2S1

EC-201

[KA24DE]

A properly working valve makes a hissing noise as air passes
through it. A strong vacuum should be felt immediately when a
finger is placed over the valve inlet.

Removal and Installation

UBS00D49

HEATED OXYGEN SENSOR 1

Refer to

EM-13, "OUTER COMPONENT PARTS"

SEF244Q

EC-202

[KA24DE]

DTC P0134 HO2S1

PFP:22690

Component Description

UBS00D4A

The heated oxygen sensor 1 is placed into the exhaust manifold. It
detects the amount of oxygen in the exhaust gas compared to the
outside air. The heated oxygen sensor 1 has a closed-end tube
made of ceramic zirconia. The zirconia generates voltage from
approximately 1V in richer conditions to 0V in leaner conditions. The
heated oxygen sensor 1 signal is sent to the ECM. The ECM adjusts
the injection pulse duration to achieve the ideal air-fuel ratio. The
ideal air-fuel ratio occurs near the radical change from 1V to 0V.

CONSULT-II Reference Value in Data Monitor Mode

UBS00D4B

Specification data are reference values.

On Board Diagnosis Logic

UBS00D4C

Under the condition in which the heated oxygen sensor 1 signal is
not input, the ECM circuits will read a continuous approximately
0.3V. Therefore, for this diagnosis, the time that output voltage is
within 200 to 400 mV range is monitored, and the diagnosis checks
that this time is not inordinately long.

SEF463R

SEF288D

MONITOR ITEM

CONDITION

SPECIFICATION

HO2S1 (B1)

●

Engine: After warming up

Maintaining engine speed at 2,000
rpm

0 - 0.3V

←→ Approx. 0.6 - 1.0V

HO2S1 MNTR (B1)

LEAN

←→ RICH

Changes more than 5 times during
10 seconds.

SEF237U

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0134

Heated oxygen sensor
1 circuit no activity
detected

The voltage from the sensor is constantly
approx. 0.3V.

●

Harness or connectors
(The sensor circuit is open or shorted)

●

Heated oxygen sensor 1

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