Infiniti G20 (P11). Manual — part 188
![](/vehicles/zatt/wheiso/zix/pelon.png)
Component Description
NCEC0059
The absolute pressure sensor is built into the ECM. The sensor
detects ambient barometric pressure and sends the voltage signal
to the micro computer. As the pressure increases, the voltage rises.
On Board Diagnosis Logic
NCEC0060
DTC No.
Malfunction is detected when ...
Check Items (Possible Cause)
P0105
An excessively low or high voltage from the sensor is
sent to the micro computer.
I
ECM
SEF058Y
DTC Confirmation Procedure
NCEC0061
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.
With CONSULT-II
1)
Turn ignition switch “ON”.
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Wait at least 6 seconds.
4)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-164.
With GST
Follow the procedure “With CONSULT-II” above.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0105 ABSOLUTE PRESSURE SENSOR
Component Description
EC-163
![](/vehicles/zatt/wheiso/zix/ych.png)
Diagnostic Procedure
NCEC0670
1
INSPECTION START
With CONSULT-II
1. Turn ignition switch “ON”.
2. Select “SELF DIAG RESULTS” mode with CONSULT-II.
3. Touch “ERASE”.
4. Perform “DTC Confirmation Procedure”.
See EC-163.
5. Is the 1st trip DTC P0105 displayed again?
With GST
1. Turn ignition switch “ON”.
2. Select MODE 4 with GST.
3. Touch “ERASE”.
4. Perform “DTC Confirmation Procedure”.
See EC-163.
5. Is the 1st trip DTC P0105 displayed again?
Yes or No
Yes
©
GO TO 2.
No
©
INSPECTION END
2
REPLACE ECM
1. Replace ECM.
2. Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs. Refer to “IVIS (INFINITI
VEHICLE IMMOBILIZER SYSTEM — NATS)”, EC-81.
3. Perform “Idle Air Volume Learning”, EC-65,
Is the result CMPLT or INCMP?
CMPLT or INCMP
CMPLT
©
INSPECTION END
INCMP
©
Follow the construction of “Idle Air Volume Learning”.
DTC P0105 ABSOLUTE PRESSURE SENSOR
Diagnostic Procedure
EC-164
![](/vehicles/zatt/wheiso/zix/traiing.png)
SEF206T
Component Description
NCEC0066
The intake air temperature sensor is mounted to the air duct hous-
ing. The sensor detects intake air temperature and transmits a sig-
nal to the ECM.
The temperature sensing unit uses a thermistor which is sensitive
to the change in temperature. Electrical resistance of the thermistor
decreases in response to the temperature rise.
SEF012P
<Reference data>
Intake air temperature
°C (°F)
Voltage*
V
Resistance
k
Ω
20 (68)
3.5
2.1 - 2.9
80 (176)
1.23
0.27 - 0.38
*: These data are reference values and are measured between ECM terminal 64
(Intake air temperature sensor) and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/
output voltage. Doing so may result in damage to the ECM’s
transistor. Use a ground other than ECM terminals, such as
the ground.
On Board Diagnosis Logic
NCEC0067
DTC No.
Malfunction is detected when ...
Check Items (Possible Cause)
P0110
A)
An excessively low or high voltage from the sensor
is sent to ECM.
I
Harness or connectors
(The sensor circuit is open or shorted.)
I
Intake air temperature sensor
B)
Rationally incorrect voltage from the sensor is sent
to ECM, compared with the voltage signal from
engine coolant temperature sensor.
DTC Confirmation Procedure
NCEC0068
Perform “PROCEDURE FOR MALFUNCTION A” first. If the 1st
trip 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.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0110 INTAKE AIR TEMPERATURE SENSOR
Component Description
EC-165
![](/vehicles/zatt/wheiso/zix/myepove.png)
SEF058Y
PROCEDURE FOR MALFUNCTION A
NCEC0068S01
With CONSULT-II
1)
Turn ignition switch “ON”.
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Wait at least 5 seconds.
4)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-168.
With GST
Follow the procedure “With CONSULT-II” above.
SEF176Y
PROCEDURE FOR MALFUNCTION B
NCEC0068S02
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.
I
Perform the following steps before engine coolant temperature
is above 90°C (194°F).
2)
Turn ignition switch “ON”.
3)
Select “DATA MONITOR” mode with CONSULT-II.
4)
Start engine.
5)
Hold vehicle speed more than 70 km/h (43 MPH) for 105 con-
secutive seconds.
6)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-168.
With GST
Follow the procedure “With CONSULT-II” above.
DTC P0110 INTAKE AIR TEMPERATURE SENSOR
DTC Confirmation Procedure (Cont’d)
EC-166
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