Infiniti M45 (Y34). Manual - part 445

DTC P1143, P1163 HO2S1

EC-469

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DTC Confirmation Procedure

ABS002OC

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 10 seconds before conducting the next test.

TESTING CONDITION:

●

Always perform at a temperature above 

−

10

°

C (14

°

F).

●

Before performing 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 10 seconds.

3.

Turn ignition switch ON and select “HO2S1 (B1) P1143” of “HO2S1” or “HO2S1 (B2) P1163” 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 3,000 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 40 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-470, "Diagnostic

Procedure"

 .

PBIB0546E

ENG SPEED

1,100 - 2,000 rpm

VHCL SPEED SE

Less than 100 km/h (62 MPH)

B/FUEL SCHDL

1.6 - 12.0 msec

Selector lever

Suitable position

PBIB0547E

SEC769C

EC-470

DTC P1143, P1163 HO2S1

Overall Function Check

ABS002OD

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

 WITH GST

1.

Start engine and warm it up to normal operating temperature.

2.

Set voltmeter probes between ECM terminal 114 [HO2S1(B1) signal] or 115 [HO2S1(B2) signal] and
ground.

3.

Check one of the following with engine speed held at 2,000 rpm
constant 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-470, "Diagnostic Procedure"

 .

Diagnostic Procedure

ABS002OE

1. 

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten two ground screws. 
Refer to 

EC-141, "Ground Inspection"

 .

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2. 

RETIGHTEN HEATED OXYGEN SENSOR 1

Loosen and retighten corresponding heated oxygen sensor 1.

>> GO TO 3.

PBIB0063E

PBIB1118E

Tightening torque: 40 - 50 N·m (4.1 - 5.1 kg-m, 30 - 37 ft-lb)

PBIB0016E

DTC P1143, P1163 HO2S1

EC-471

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3. 

CLEAR THE SELF-LEARNING DATA

 With CONSULT-II

1.

Start engine and warm it up to normal operating temperature.

2.

Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT-II.

3.

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

4.

Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171, P0174 detected?
Is it difficult to start engine?

 Without CONSULT-II

1.

Start engine and warm it up to normal operating temperature.

2.

Turn ignition switch OFF.

3.

Disconnect mass air flow sensor harness connector, and restart
and run engine for at least 5 seconds at idle speed.

4.

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

5.

Make sure DTC P0102 is displayed.

6.

Erase the DTC memory. Refer to 

EC-62, "HOW TO ERASE

EMISSION-RELATED DIAGNOSTIC INFORMATION"

 .

7.

Make sure DTC P0000 is displayed.

8.

Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171, P0174 detected?
Is it difficult to start engine?

Yes or No

Yes

>> Perform trouble diagnosis for DTC P0171, P0174. Refer to 

EC-266

 .

No

>> GO TO 4.

4. 

CHECK HEATED OXYGEN SENSOR 1 HEATER

Refer to 

EC-164, "Component Inspection"

 .

OK or NG

OK

>> GO TO 5.

NG

>> Replace malfunctioning heated oxygen sensor 1.

5. 

CHECK HEATED OXYGEN SENSOR 1

Refer to 

EC-472, "Component Inspection"

 .

OK or NG

OK

>> GO TO 6.

NG

>> Replace malfunctioning heated oxygen sensor 1.

6. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

For circuit, refer to 

EC-216, "Wiring Diagram"

 .

>> INSPECTION END

SEF968Y

PBIB1119E

EC-472

DTC P1143, P1163 HO2S1

Component Inspection

ABS002OF

HEATED OXYGEN SENSOR 1 

 With CONSULT-II

1.

Start engine and warm it up to normal operating temperature.

2.

Select “MANU TRIG” and adjust “TRIGGER POINT” to 100% in
“DATA MONITOR” mode with CONSULT-II. 

3.

Select “HO2S1 (B1)/(B2)” and “HO2S1 MNTR (B1)/(B2)”.

4.

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

5.

Touch “RECORD” on CONSULT-II screen.

6.

Check the following.

●

“HO2S1 MNTR (B1)/(B2)” in “DATA MONITOR” mode
changes from “RICH” to “LEAN” to “RICH” more than 5 times
in 10 seconds.
5 times (cycles) are counted as shown at right.

●

“HO2S1 (B1)/(B2)” voltage goes above 0.6V at least once.

●

“HO2S1 (B1)/(B2)” voltage goes below 0.3V at least once.

●

“HO2S1 (B1)/(B2)” 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.

PBIB1919E

SEF647Y

SEF648Y