Infiniti F50. Manual — part 386
DTC P0102, P0103 MAF SENSOR
EC-185
C
D
E
F
G
H
I
J
K
L
M
A
EC
●
Perform steps 2 and 3 again.
5.
If NG, remove mass air flow sensor from air duct. Check hot film for damage or dust.
6.
If NG, clean or replace mass air flow sensor.
Removal and Installation
EBS00LXS
MASS AIR FLOW SENSOR
Refer to
EM-15, "AIR CLEANER AND AIR DUCT"
.
EC-186
DTC P0112, P0113 IAT SENSOR
DTC P0112, P0113 IAT SENSOR
PFP:22630
Component Description
EBS00LXT
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>
*: These data are reference values and are 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
EBS00LXU
DTC Confirmation Procedure
EBS00LXV
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.
Start engine and wait at least 5 seconds.
4.
If 1st trip DTC is detected, go to
EC-188, "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
DTC P0112, P0113 IAT SENSOR
EC-187
C
D
E
F
G
H
I
J
K
L
M
A
EC
Wiring Diagram
EBS00LXW
TBWM0008E
EC-188
DTC P0112, P0113 IAT SENSOR
Diagnostic Procedure
EBS00LXX
1.
CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT
1.
Turn ignition switch “OFF”.
2.
Disconnect mass air flow sensor (intake air temperature sensor
is built-into) harness connector.
3.
Turn ignition switch “ON”.
4.
Check voltage between mass air flow sensor terminal 5 and
ground.
OK or NG
OK
>> GO TO 2.
NG
>> Repair harness or connectors.
2.
CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch “OFF”.
2.
Disconnect ECM.
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 3.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
3.
CHECK INTAKE AIR TEMPERATURE SENSOR
Refer to
EC-188, "Diagnostic Procedure"
OK or NG
OK
>> GO TO 4.
NG
>> Replace mass air flow sensor (with intake air temperature sensor).
4.
CHECK INTERMITTENT INCIDENT
Refer to
EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
>> INSPECTION END
PBIB0012E
Voltage: Approximately 5V
PBIB0066E
Continuity should exist.
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