Nissan Frontier D22. Manual - part 280

DTC P0139 HO2S2

EC-223

[KA24DE]

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

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

Reconnect all harness connectors disconnected.

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

Turn ignition switch OFF and wait at least 5 seconds.

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

Let engine idle for 1 minute.

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

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.

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

EC-224

[KA24DE]

DTC P0139 HO2S2

Removal and Installation

UBS00D4Z

HEATED OXYGEN SENSOR 2

Refer to

EX-3, "EXHAUST SYSTEM"

DTC P0171 FUEL INJECTION SYSTEM FUNCTION

EC-225

[KA24DE]

DTC P0171 FUEL INJECTION SYSTEM FUNCTION

PFP:16600

On Board Diagnosis Logic

UBS00D50

With the Air-Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the
theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensor 1. The
ECM calculates the necessary compensation to correct the offset between the actual and the theoretical
ratios.
In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the
ECM judges the condition as the fuel injection system malfunction and lights up the MIL (2 trip detection logic).

DTC Confirmation Procedure

UBS00D51

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.

WITH CONSULT-II

Start engine and warm it up to normal operating temperature.

Turn ignition switch OFF and wait at least 5 seconds.

Turn ignition switch ON and select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CON-
SULT-II.

Clear the self-learning control coefficient by touching “CLEAR”.

Select “DATA MONITOR” mode with CONSULT-II.

Start engine again and let it idle for at least 10 minutes.
The 1st trip DTC P0171 should be detected at this stage, if a
malfunction exists. If so, go to

EC-228, "Diagnostic Procedure"

If it is difficult to start engine at step 6, the fuel injection system
has a malfunction.

Crank engine while depressing accelerator pedal. If engine
starts, go to

EC-228, "Diagnostic Procedure"

. If engine does not

start, visually check for exhaust and intake air leak.

Sensor

Input Signal to ECM

ECM function

Actuator

Heated oxygen sensor 1

Density of oxygen in exhaust gas
(Mixture ratio feedback signal)

Fuel injection & mixture
ratio control

Fuel injector

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0171

Fuel injection system too
lean

●

Fuel injection system does not operate properly.

●

The amount of mixture ratio compensation is too
large. (The mixture ratio is too lean.)

●

Intake air leaks

●

Heated oxygen sensor 1

●

Fuel injector

●

Exhaust gas leaks

●

Incorrect fuel pressure

●

Lack of fuel

●

Mass air flow sensor

●

Incorrect PCV hose connection

SEF215Z

SEF058Y

EC-226

[KA24DE]

DTC P0171 FUEL INJECTION SYSTEM FUNCTION

WITH GST

Start engine and warm it up to normal operating temperature.

Turn ignition switch OFF and wait at least 5 seconds.

Disconnect mass air flow sensor harness connector. Then
restart and run engine for at least 3 seconds at idle speed.

Stop engine and reconnect mass air flow sensor harness con-
nector.

Select “MODE 7” with GST. Make sure DTC P0102 is detected.

Select “MODE 4” with GST and erase the DTC P0102.

Start engine again and run it for at least 10 minutes at idle
speed.

Select “MODE 7” with GST. The 1st trip DTC P0171 should be
detected at this stage, if a malfunction exists. If so, go to

EC-

228, "Diagnostic Procedure"

If it is difficult to start engine at step 8, the fuel injection system has a malfunction.

10. Crank engine while depressing accelerator pedal. If engine starts, go to

EC-228, "Diagnostic Procedure"

If engine does not start, visually check for exhaust and intake air leak visually.

AEC131A

Content .. 278 279 280 281 ..