Infiniti M45 (Y34). Manual - part 380

 

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Infiniti M45 (Y34). Manual - part 380

 

 

DTC P0127 IAT SENSOR

EC-209

C

D

E

F

G

H

I

J

K

L

M

A

EC

DTC Confirmation Procedure

ABS002GC

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.

CAUTION:

Always drive vehicle at a safe speed.
TESTING CONDITION:
This test may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road
test is expected to be easier, it is unnecessary to lift the vehicle.

 WITH CONSULT-II

1.

Wait until engine coolant temperature is less than 90

°

C (194

°

F)

a.

Turn ignition switch ON.

b.

Select “DATA MONITOR” mode with CONSULT-II.

c.

Check the engine coolant temperature.

d.

If the engine coolant temperature is not less than 90

°

C (194

°

F),

turn ignition switch OFF and cool down engine.

Perform the following steps before engine coolant tempera-
ture reaches 90

°

C (194

°

F).

2.

Turn ignition switch ON.

3.

Select “DATA MONITOR” mode with CONSULT-II.

4.

Start engine.

5.

Hold vehicle speed at more than 71 km/h (44 MPH) for 100 con-
secutive seconds.

6.

If 1st trip DTC is detected, go to 

EC-210, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure WITH CONSULT-II above.

PBIB1917E

EC-210

DTC P0127 IAT SENSOR

Diagnostic Procedure

ABS002GE

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. 

CHECK INTAKE AIR TEMPERATURE SENSOR

Refer to 

EC-210, "Component Inspection"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Replace mass air flow sensor (with intake air temperature sensor).

3. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

Refer to 

EC-190, "Wiring Diagram"

 .

>> INSPECTION END

Component Inspection

ABS002GF

INTAKE AIR TEMPERATURE SENSOR

1.

Check resistance between intake air temperature sensor termi-
nals 3 and 5 under the following conditions.

2.

If NG, replace mass air flow sensor (with intake air temperature
sensor).

PBIB1118E

SEC266C

Intake air temperature 

°

C (

°

F)

Resistance k

25 (77)

1.9 - 2.1

SEF012P

DTC P0127 IAT SENSOR

EC-211

C

D

E

F

G

H

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J

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EC

Removal and Installation

ABS002GG

MASS AIR FLOW SENSOR

Refer to 

EM-16, "AIR CLEANER AND AIR DUCT"

 .

EC-212

DTC P0128 THERMOSTAT FUNCTION

DTC P0128 THERMOSTAT FUNCTION

PFP:21200

On Board Diagnosis Logic

ABS002GH

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

ABS002GI

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-24, "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-212, "Diagnostic Procedure"

 .

 WITH GST

1.

Follow the procedure WITH CONSULT-II above.

Diagnostic Procedure

ABS002GJ

1. 

CHECK ENGINE COOLANT TEMPERATURE SENSOR

Refer to 

EC-213, "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)

PBIB1917E

 

 

 

 

 

 

 

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