Infiniti Q45. Manual - part 399

DTC P0128 THERMOSTAT FUNCTION

EC-235

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Component Inspection

NBS001TX

ENGINE COOLANT TEMPERATURE SENSOR

1.

Check resistance between engine coolant temperature sensor
terminals 1 and 2 as shown in the figure.

<Reference data>

2.

If NG, replace engine coolant temperature sensor.

Removal and Installation

NBS001TY

ENGINE COOLANT TEMPERATURE SENSOR

Refer to 

EM-67, "CYLINDER HEAD"

 .

PBIB2005E

Engine coolant temperature

°

C (

°

F)

Resistance

k

Ω

20 (68)

2.1 - 2.9

50 (122)

0.68 - 1.00

90 (194)

0.236 - 0.260

SEF012P

EC-236

DTC P0130, P0150 A/F SENSOR 1

DTC P0130, P0150 A/F SENSOR 1

PFP:22693

Component Description

NBS002WY

The air fuel ratio (A/F) sensor 1 is a planar dual-cell limit current sen-
sor. The sensor element of the A/F sensor 1 is the combination of a
Nernst concentration cell (sensor cell) with an oxygen-pump cell,
which transports ions. It has a heater in the element.
The sensor is capable of precise measurement   = 1, but also in the
lean and rich range. Together with its control electronics, the sensor
outputs a clear, continuous signal throughout a wide   range (0.7 <

 < air).

The exhaust gas components diffuse through the diffusion gap at the
electrode of the oxygen pump and Nernst concentration cell, where
they are brought to thermodynamic balance.

An electronic circuit controls the pump current through the oxygen-
pump cell so that the composition of the exhaust gas in the diffusion
gap remains constant at   = 1. Therefore, the A/F sensor 1 is able to
indicate air/fuel ratio by this pumping of current. In addition, a heater
is integrated in the sensor to ensure the required operating tempera-
ture of 700 - 800

°

C (1,292 - 1,472

°

F).

CONSULT-II Reference Value in Data Monitor Mode

NBS002WZ

Specification data are reference values.

On Board Diagnosis Logic

NBS002X0

To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the A/F sensor 1
signal fluctuates according to fuel feedback control.

DTC Confirmation Procedure

NBS002X1

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:
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.

Select “A/F SEN1 (B1)” or “A/F SEN1 (B2)” in “DATA MONITOR” mode with CONSULT-II.

3.

Check “A/F SEN1 (B1)” or “A/F SEN1 (B2)” indication.

SEF579Z

SEF580Z

MONITOR ITEM

CONDITION

SPECIFICATION

A/F SEN1 (B1)
A/F SEN1 (B2)

●

Engine: After warming up

Maintaining engine speed at 2,000 rpm

Fluctuates around 1.5 V

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible Cause

P0130
0130
(Bank 1)

Air fuel ratio (A/F) sensor 1 
circuit

●

The A/F signal computed by ECM from the A/F 
sensor 1 signal is constantly approx. 1.5V.

●

Harness or connectors
(The A/F sensor 1 circuit is open or 
shorted.)

●

A/F sensor 1

P0150
0150
(Bank 2)

DTC P0130, P0150 A/F SENSOR 1

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If the indication is constantly approx. 1.5V and does not fluctuates, go to 

EC-242, "Diagnostic Procedure"

 .

If the indication fluctuates around 1.5V, go to next step.

4.

Select “A/F SEN1 (B1) P1276” (for DTC P0130) or “A/F SEN1 (B2) P1286” (for DTC P0150) of “A/F
SEN1” in “DTC WORK SUPPORT” mode with CONSULT-II.

5.

Touch “START”.

6.

When the following conditions are met, “TESTING” will be dis-
played on the CONSULT-II screen.

If “TESTING” is not displayed after 20 seconds, retry from
step 2.

7.

Release accelerator pedal fully.

NOTE:
Never apply brake during releasing the accelerator pedal.

8.

Make sure that “TESTING” changes to “COMPLETED”.
If “TESTING” changed to “OUT OF CONDITION”, retry from
step 6.

9.

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

EC-242, "Diagnostic Procedure"

 .

Overall Function Check

NBS002X2

Use this procedure to check the overall function of the A/F 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.

Drive the vehicle at a speed of 80 km/h (50 MPH) for a few minutes in the suitable gear position.

3.

Set D position, then release the accelerator pedal fully until the vehicle speed decreases to 50 km/h (30
MPH).

NOTE:
Never apply brake during releasing the accelerator pedal.

4.

Repeat steps 2 to 3 for five times.

5.

Stop the vehicle and turn ignition switch OFF.

6.

Wait at least 10 seconds and restart engine.

7.

Repeat steps 2 to 3 for five times.

8.

Stop the vehicle and connect GST to the vehicle.

ENG SPEED

1,300 - 3,200 rpm

Vehicle speed

More than 64 km/h (40 MPH)

B/FUEL SCHDL

1.0 - 8.0 msec

Selector lever

D position

SEF576Z

SEF577Z

SEF578Z

EC-238

DTC P0130, P0150 A/F SENSOR 1

9.

Make sure that no DTC is displayed.
If the DTC is displayed, go to 

EC-242, "Diagnostic Procedure"

 .