Infiniti F50. Manual - part 456

DTC P1143, P1163 HO2S1

EC-465

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EC

Overall Function Check

EBS00MIK

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.

2.

Set voltmeter probes between ECM terminal 114 [HO2S1(B1) signal] or 115 [HO2S1(B2) signal] and
engine 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-465, "Diagnostic Procedure"

 .

Diagnostic Procedure

EBS00MIL

1. 

RETIGHTEN GROUND SCREWS

1.

Turn ignition switch “OFF”.

2.

Loosen and retighten engine ground screws.

>> GO TO 2.

2. 

RETIGHTEN HEATED OXYGEN SENSOR 1

Loosen and retighten corresponding heated oxygen sensor 1.

>> GO TO 3.

PBIB0063E

PBIB0011E

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

PBIB0016E

EC-466

DTC P1143, P1163 HO2S1

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 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-63, "HOW TO ERASE

EMISSION-RELATED DIAGNOSTIC INFORMATION"

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7.

Make sure DTC P0000 is displayed.

8.

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

Yes or No

Yes

>> Perform trouble diagnosis for DTC P0171. Refer to 

EC-265

 .

No

>> GO TO 4.

4. 

CHECK HEATED OXYGEN SENSOR 1 HEATER

Refer to 

EC-162, "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-467, "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"

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For circuit, refer to 

EC-214, "Wiring Diagram"

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>> INSPECTION END

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PBIB0012E

DTC P1143, P1163 HO2S1

EC-467

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EC

Component Inspection

EBS00MIM

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.

SEF646Y

SEF647Y

SEF648Y

EC-468

DTC P1143, P1163 HO2S1

 Without CONSULT-II

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
engine ground.

3.

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 5 times within 10 seconds.

●

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.

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

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.

Removal and Installation

EBS00MIN

HEATED OXYGEN SENSOR 1

Refer to 

EM-22, "EXHAUST MANIFOLD AND THREE WAY CATALYST"

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PBIB0063E