Infiniti M35/M45 Y50. Manual — part 434
DTC P0112, P0113 IAT SENSOR
EC-209
[VQ35DE]
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EC
DTC P0112, P0113 IAT SENSOR
PFP:22630
Component Description
NBS004V5
The intake air temperature sensor is built-into mass air flow sensor
(1). The sensor detects intake air temperature and transmits a signal
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.
<Reference data>
*: This data is reference value and is measured between ECM terminal 34 (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
NBS004V6
DTC Confirmation Procedure
NBS004V7
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 5 seconds.
4.
If 1st trip DTC is detected, go to
EC-212, "Diagnostic Procedure"
.
PBIA9559J
Intake air temperature
°
C (
°
F)
Voltage*
V
Resistance
k
Ω
25 (77)
3.3
1.800 - 2.200
80 (176)
1.2
0.283 - 0.359
SEF012P
DTC No.
Trouble diagnosis
name
DTC detecting condition
Possible cause
P0112
0112
Intake air tempera-
ture sensor circuit
low input
An excessively low voltage from the sensor is
sent to ECM.
●
Harness or connectors
(The sensor circuit is open or shorted.)
●
Intake air temperature sensor
P0113
0113
Intake air tempera-
ture sensor circuit
high input
An excessively high voltage from the sensor is
sent to ECM.
SEF058Y
EC-210
[VQ35DE]
DTC P0112, P0113 IAT SENSOR
WITH GST
Follow the procedure “WITH CONSULT-II” above.
DTC P0112, P0113 IAT SENSOR
EC-211
[VQ35DE]
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EC
Wiring Diagram
NBS004V8
TBWT0951E
EC-212
[VQ35DE]
DTC P0112, P0113 IAT SENSOR
Diagnostic Procedure
NBS004V9
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten two ground screws on the body.
Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1.
Disconnect mass air flow sensor (intake air temperature sensor
is built-into) (1) harness connector.
2.
Turn ignition switch ON.
3.
Check voltage between mass air flow sensor terminal 5 and
ground with CONSULT-II or tester.
OK or NG
OK
>> GO TO 3.
NG
>> Repair open circuit or short to ground or short to power
in harness or connectors.
1.
Body ground M70
2.
Body ground M16
PBIB2782E
PBIB2783E
Voltage: Approximately 5V
PBIB1169E
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