Infiniti M45 (Y34). Manual — part 380
DTC P0127 IAT SENSOR
EC-209
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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
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
>> 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
Ω
25 (77)
1.9 - 2.1
SEF012P
DTC P0127 IAT SENSOR
EC-211
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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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