Infiniti M35/M45 Y50. Manual - part 618

 

  Index      Infiniti     Infiniti M35/M45 Y50 - service repair manual 2007 year

 

Search            copyright infringement  

 

 

 

 

 

 

 



 

 

Content   ..  616  617  618  619   ..

 

 

Infiniti M35/M45 Y50. Manual - part 618

 

 

DTC P0128 THERMOSTAT FUNCTION

EC-945

[VK45DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

DTC P0128 THERMOSTAT FUNCTION

PFP:21200

On Board Diagnosis Logic

NBS005DK

Engine coolant temperature has not risen enough to open the thermostat even though the engine has run long
enough.
This is due to a leak in the seal or the thermostat stuck open.

DTC Confirmation Procedure

NBS005DL

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:

For best results, perform at ambient temperature of –10

°

C (14

°

F) or higher.

For best results, perform at engine coolant temperature of –10

°

C (14

°

F) to 60

°

C (140

°

F).

 WITH CONSULT-II

1.

Replace thermostat with new one. Refer to 

CO-55, "THERMOSTAT AND WATER CONTROL VALVE"

 .

Use only a genuine NISSAN thermostat as a replacement. If an incorrect thermostat is used, the MIL may
come on.

2.

Turn ignition switch ON.

3.

Select “COOLAN TEMP/S” in “DATA MONITOR” mode with
CONSULT-II.

4.

Check that the “COOLAN TEMP/S” is above 60

°

C (140

°

F).

If it is below 60

°

C (140

°

F), go to following step.

If it is above 60

°

C (140

°

F), cool down the engine to less than

60

°

C (140

°

F), then retry from step 1.

5.

Drive vehicle for 10 consecutive minutes under the following
conditions.

If 1st trip DTC is detected, go to 

EC-945, "Diagnostic Procedure"

.

 WITH GST

1.

Follow the procedure “WITH CONSULT-II” above.

Diagnostic Procedure

NBS005DM

1. 

CHECK ENGINE COOLANT TEMPERATURE SENSOR

Refer to 

EC-946, "Component Inspection"

 .

OK or NG

OK

>> INSPECTION END

NG

>> Replace engine coolant temperature sensor.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0128
0128

Thermostat function

The engine coolant temperature does not 
reach to specified temperature even though 
the engine has run long enough.

Thermostat

Leakage from sealing portion of thermostat

Engine coolant temperature sensor

VHCL SPEED SE

80 - 120 km/h (50 - 75 MPH)

SEF176Y

EC-946

[VK45DE]

DTC P0128 THERMOSTAT FUNCTION

Component Inspection

NBS005DN

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

NBS005DO

ENGINE COOLANT TEMPERATURE SENSOR

Refer to 

CO-55, "THERMOSTAT AND WATER CONTROL VALVE"

 .

PBIB2005E

Temperature 

°

C (

°

F)

Resistance k

20 (68)

2.1 - 2.9

50 (122)

0.68 - 1.0

90 (194)

0.236 - 0.260

SEF012P

DTC P0130, P0150 A/F SENSOR 1

EC-947

[VK45DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

DTC P0130, P0150 A/F SENSOR 1

PFP:22693

Component Description

NBS005DP

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

NBS005DQ

Specification data are reference values.

On Board Diagnosis Logic

NBS005DR

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

NBS005DS

Perform PROCEDURE FOR MALFUNCTION A first.
If the DTC cannot be confirmed, perform PROCEDURE FOR MALFUNCTION B.

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.

PROCEDURE FOR MALFUNCTION A

 With CONSULT-II

1.

Start engine and warm it up to normal operating temperature.

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

A)

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

Harness or connectors
[Air fuel ratio (A/F) sensor 1 circuit 
is open or shorted.]

Air fuel ratio (A/F) sensor 1

P0150
0150
(Bank 2)

B)

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

EC-948

[VK45DE]

DTC P0130, P0150 A/F SENSOR 1

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Let engine idle for 2 minutes.

4.

If 1st trip DTC is detected, go to 

EC-953, "Diagnostic Procedure"

.

 With GST

Follow the procedure “With CONSULT-II” above.

PROCEDURE FOR MALFUNCTION B

CAUTION:

Always drive vehicle at a safe speed.

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

EC-953, "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.

SEF174Y

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

 

 

 

 

 

 

 

Content   ..  616  617  618  619   ..