Infiniti M45 (Y34). Manual — part 375
DTC P0112, P0113 IAT SENSOR
EC-189
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DTC P0112, P0113 IAT SENSOR
PFP:22630
Component Description
ABS002FH
The intake air temperature sensor is built-into mass air flow sensor.
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 values and is measured between ECM terminal 99 (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
ABS002FI
DTC Confirmation Procedure
ABS002FJ
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-191, "Diagnostic Procedure"
.
WITH GST
Follow the procedure WITH CONSULT-II above.
SEC266C
Intake air temperature
°
C (
°
F)
Voltage*
V
Resistance
k
Ω
25 (77)
3.32
1.9 - 2.1
80 (176)
1.23
0.31 - 0.37
SEF012P
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0112
0112
Intake air temperature 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 temperature sensor
circuit high input
An excessively high voltage from the sensor
is sent to ECM.
SEF058Y
EC-190
DTC P0112, P0113 IAT SENSOR
Wiring Diagram
ABS002FK
TBWA0272E
DTC P0112, P0113 IAT SENSOR
EC-191
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Diagnostic Procedure
ABS002FL
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 POWER SUPPLY CIRCUIT
1.
Disconnect mass air flow sensor (intake air temperature sensor
is built-into) harness connector.
2.
Turn ignition switch ON.
3.
Check voltage between mass air flow sensor terminal 5 and
ground.
OK or NG
OK
>> GO TO 3.
NG
>> Repair open circuit or short to ground or short to power
in harness or connectors.
3.
CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between mass air flow sensor terminal 3 and ECM terminal 109.
Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 4.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
PBIB1118E
PBIB1119E
Voltage: Approximately 5V
PBIB0066E
Continuity should exist.
EC-192
DTC P0112, P0113 IAT SENSOR
4.
CHECK INTAKE AIR TEMPERATURE SENSOR
Refer to
EC-191, "Diagnostic Procedure"
OK or NG
OK
>> GO TO 5.
NG
>> Replace mass air flow sensor (with intake air temperature sensor).
5.
CHECK INTERMITTENT INCIDENT
Refer to
EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
>> INSPECTION END
Component Inspection
ABS002FM
INTAKE AIR TEMPERATURE SENSOR
1.
Check resistance between intake air temperature sensor termi-
nals 3 and 5 under the following conditions.
<Reference data>
2.
If NG, replace mass air flow sensor (with intake air temperature
sensor).
Removal and Installation
ABS002FN
MASS AIR FLOW SENSOR
Refer to
EM-16, "AIR CLEANER AND AIR DUCT"
SEC266C
Intake air temperature
°
C (
°
F)
Resistance k
Ω
25 (77)
1.9 - 2.1
SEF012P
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