Nissan Frontier D22. Manual - part 328

DTC P0605 ECM

EC-415

[KA24DE]

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EC

Diagnostic Procedure

UBS00D9N

1. 

INSPECTION START

 With CONSULT-II

1.

Turn ignition switch ON.

2.

Select “SELF DIAG RESULTS” mode with CONSULT-II.

3.

Touch “ERASE”.

4.

Perform “DTC Confirmation Procedure”.
See previous page.

5.

Is the 1st trip DTC P0605 displayed again?

 With GST

1.

Turn ignition switch ON.

2.

Select MODE 4 with GST.

3.

Touch “ERASE”.

4.

Perform “DTC Confirmation Procedure”.
See previous page.

5.

Is the 1st trip DTC P0605 displayed again?

Yes or No

Yes

>> Replace ECM.

No

>> INSPECTION END.

EC-416

[KA24DE]

DTC P1143 HO2S1

DTC P1143 HO2S1

PFP:22690

Component Description

UBS00D9O

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

UBS00D9P

Specification data are reference values.

On Board Diagnosis Logic

UBS00D9Q

To judge the malfunction, the output from the heated oxygen sensor
1 is monitored to determine whether the “rich” output is sufficiently
high and whether the “lean” output is sufficiently low. When both the
outputs are shifting to the lean side, the malfunction will be detected.

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.

SEF300U

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1143

Heated oxygen sensor 
1 lean shift monitoring

The maximum and minimum voltage from the 
sensor are not reached to the specified voltages.

●

Heated oxygen sensor 1

●

Heated oxygen sensor 1 heater

●

Fuel pressure

●

Fuel injector

●

Intake air leaks

DTC P1143 HO2S1

EC-417

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DTC Confirmation Procedure

UBS00D9R

CAUTION:

Always drive vehicle at a safe speed.

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:

●

Always perform at a temperature above 

−10°C (14°F).

●

Before performing the following procedure, confirm that battery voltage is more than 11V at idle.

 WITH CONSULT-II

1.

Start engine and warm it up to normal operating temperature.

2.

Stop engine and wait at least 5 seconds.

3.

Turn ignition switch ON and select “HO2S1 (B1) P1143” of
“HO2S1” in “DTC WORK SUPPORT” mode with CONSULT-II.

4.

Touch “START”.

5.

Start engine and let it idle for at least 3 minutes.

NOTE:
Never raise engine speed above 3,600 rpm after this step. If
the engine speed limit is exceeded, return to step 5.

6.

When the following conditions are met, “TESTING” will be dis-
played on the CONSULT-II screen. Maintain the conditions con-
tinuously until “TESTING” changes to “COMPLETED”. (It will
take approximately 50 seconds or more.)

If “TESTING” is not displayed after 5 minutes, retry from
step 2.

7.

Make sure that “OK” is displayed after touching “SELF-DIAG
RESULTS”. If “NG” is displayed, refer to 

EC-418, "Diagnostic

Procedure"

 .

Overall Function Check

UBS00D9S

Use this procedure to check the overall function of the heated oxygen sensor 1 circuit. During this check, a
DTC might not be confirmed.

 WITH GST

1.

Start engine and warm it up to normal operating temperature.

LEC054A

ENG SPEED

1,200 - 3,150 rpm

Vehicle speed

Less than 100 km/h (Less than 62 MPH)

B/FUEL SCHDL

3.5 - 15 msec

Selector lever

Suitable position

LEC053A

LEC055A

EC-418

[KA24DE]

DTC P1143 HO2S1

2.

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

3.

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

–

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

–

The minimum voltage is over 0.1V at least 1 time.

4.

If NG, go to 

EC-418, "Diagnostic Procedure"

 .

Diagnostic Procedure

UBS00D9T

1. 

RETIGHTEN HEATED OXYGEN SENSOR 1

1.

Turn ignition switch OFF.

2.

Loosen and retighten heated oxygen sensor 1.

>> GO TO 2.

AEC873A

Tightening torque

:40 - 60 N·m
(4.1 - 6.1 kg-m, 30 - 44 ft-lb)

BBIA0429E