Infiniti F50. Manual - part 455

DTC P1140, P1145 IVT CONTROL POSITION SENSOR

EC-461

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7. 

CHECK CRANKSHAFT POSITION SENSOR (POS)

Refer to 

EC-314, "Component Inspection"

 .

OK or NG

OK

>> GO TO 8.

NG

>> Replace crankshaft position sensor (POS).

8. 

CHECK CAMSHAFT POSITION SENSOR (PHASE)

Refer to 

EC-319, "Component Inspection"

 .

OK or NG

OK

>> GO TO 9.

NG

>> Replace camshaft position sensor (PHASE).

9. 

CHECK CAMSHAFT

Check accumulation of debris to the signal pick-up portion of the camshaft. Refer to 

EM-35, "TIMING CHAIN"

 .

OK or NG

OK

>> GO TO 10.

NG

>> Remove debris and clean the signal pick-up cutout of camshaft.

10. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Component Inspection

EBS00MIE

INTAKE VALVE TIMING CONTROL POSITION SENSOR

1.

Disconnect intake valve timing control position sensor harness connector.

2.

Loosen the fixing bolt of the sensor.

3.

Remove the sensor.

4.

Visually check the sensor for chipping.

5.

Check resistance as shown below.

6.

If NG, replace intake valve timing control position sensor.

SEF362Z

Terminal No. (Polarity)

Resistance 

Ω

 [at 25

°

C (77

°

F)]

3 (+) - 1 (-)

Except 0 or 

∞

2 (+) - 1 (-)

3 (+) - 2 (-)

PBIB0194E

EC-462

DTC P1140, P1145 IVT CONTROL POSITION SENSOR

Removal and Installation

EBS00MIF

INTAKE VALVE TIMING CONTROL POSITION SENSOR

Refer to 

EM-35, "TIMING CHAIN"

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DTC P1143, P1163 HO2S1

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DTC P1143, P1163 HO2S1

PFP:22690

Component Description

EBS00MIG

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 1 to 0V.

CONSULT-II Reference Value in Data Monitor Mode

EBS00MIH

Specification data are reference values.

On Board Diagnosis Logic

EBS00MII

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)
HO2S1 (B2)

●

Engine: After warming up

Maintaining engine speed at 2,000 rpm

0 - 0.3V 

←→

 Approx. 0.6 - 1.0V

HO2S1 MNTR (B1)
HO2S1 MNTR (B2)

●

Engine: After warming up

Maintaining engine speed at 2,000 rpm

LEAN 

←→

 RICH

Changes more than 5 times during 
10 seconds.

SEF300U

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1143
1143
(Bank 1)

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

●

Injectors

●

Intake air leaks

P1163
1163
(Bank 2)

EC-464

DTC P1143, P1163 HO2S1

DTC Confirmation Procedure

EBS00MIJ

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 3,600 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 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-465, "Diagnostic

Procedure"

 .

PBIB0546E

ENG SPEED

1,100 - 2,000 rpm

Vehicle speed

Less than 100 km/h (62 MPH)

B/FUEL SCHDL

1.6 - 12.0 msec

Selector lever

Suitable position

PBIB0547E

SEC769C