Infiniti Q45 (FY33). Manual — part 152
q
A
CHECK COMPONENT
(Absolute pressure sensor).
Refer to “COMPONENT INSPECTION”,
EC-139.
OK
E
NG
Replace absolute pressure
sensor.
Perform “TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT”, EC-117.
INSPECTION END
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0105
Absolute Pressure Sensor (Cont’d)
H
H
H
EC-137
SEF385U
SEF761X
SEF109L
Procedure B
INSPECTION START
CHECK VACUUM SOURCE TO ABSO-
LUTE PRESSURE SENSOR.
1. Start engine and warm it up to normal
operating temperature.
2. Turn ignition switch “OFF”.
3. Connect MAP/BARO switch solenoid
valve and absolute pressure sensor
with a rubber tube that has vacuum
gauge.
4. Turn ignition switch “ON”.
5. Select “MAP/BARO SW/V” in
“ACTIVE TEST” mode with
CONSULT-II.
6. Start engine and let it idle.
7. Touch “MAP” and “BARO” alter-
nately and check for vacuum.
-------------------------------------------------------------------------------------------------------------------------------------- OR --------------------------------------------------------------------------------------------------------------------------------------
4. Turn ignition switch “ON”.
5. Start engine and check for
vacuum.
For 5 seconds after starting
engine:
Vacuum should not exist.
6. More than 5 seconds after start-
ing engine.
Vacuum should exist.
OK
E
NG
CHECK VACUUM HOSE.
Check vacuum hose for
clogging, cracks, discon-
nection or improper con-
nection.
If NG, repair or replace the
hose.
OK
Check vacuum port for
clogging.
If NG, clean it.
OK
CHECK COMPONENT
(MAP/BARO switch sole-
noid valve).
Refer to “COMPONENT
INSPECTION” of
“TROUBLE DIAGNOSIS
FOR DTC P1105”, EC-358.
OK
NG
Replace
MAP/BARO
switch sole-
noid valve.
CHECK INTAKE SYSTEM.
Check intake system for air
leaks.
CHECK HOSE BETWEEN ABSOLUTE
PRESSURE SENSOR AND MAP/BARO
SWITCH SOLENOID VALVE.
1. Turn ignition switch “OFF”.
2. Check hose for clogging, cracks, dis-
connection or improper connection.
OK
E
NG
Repair or reconnect hose.
q
A
(Go to next page.)
MAP/BARO
SW/V
Vacuum
BARO
Should not exist.
MAP
Should exist.
TROUBLE DIAGNOSIS FOR DTC P0105
Absolute Pressure Sensor (Cont’d)
H
H
H
H
H
H
H
EC-138
q
A
CHECK COMPONENT
(Absolute pressure sensor).
Refer to “COMPONENT INSPECTION”
below.
OK
E
NG
Replace absolute pressure
sensor.
Perform “TROUBLE DIAGNOSIS FOR
INTERMITTENT INCIDENT”, EC-117.
INSPECTION END
SEF359W
COMPONENT INSPECTION
Absolute pressure sensor
1.
Remove absolute pressure sensor with its harness connector
connected.
2.
Remove hose from absolute pressure sensor.
3.
Turn ignition switch “ON” and check output voltage between
terminal
q
64
and engine ground.
The voltage should be 3.2 to 4.8V.
4.
Use pump to apply vacuum of −26.7 kPa (−200 mmHg, −7.87
inHg) to absolute pressure sensor as shown in figure and
check the output voltage.
The voltage should be 1.0 to 1.4V lower than the value
measured in step 3.
CAUTION:
I
Always calibrate the vacuum pump gauge when using it.
I
Do not apply below −93.3 kPa (−700 mmHg, −27.56 inHg)
or over 101.3 kPa (760 mmHg, 29.92 inHg) of pressure.
5.
If NG, replace absolute pressure sensor.
GI
MA
EM
LC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSIS FOR DTC P0105
Absolute Pressure Sensor (Cont’d)
H
H
H
EC-139
SEF050T
Intake Air Temperature Sensor
COMPONENT DESCRIPTION
The intake air temperature sensor is mounted to the intake air duct.
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.
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
q
69
(Intake air temperature sensor) and ground.
CAUTION:
Do not use ECM ground terminals when measuring voltage.
Doing so may result in damage to the ECM’s transistor. Use a
ground other than ECM terminals such as the body ground.
ON BOARD DIAGNOSIS LOGIC
Diagnostic
Trouble Code
No.
Malfunction is detected when ...
Check Items
(Possible Cause)
P0110
0401
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.
DIAGNOSTIC TROUBLE CODE CONFIRMATION
PROCEDURE
Perform “Procedure for malfunction A” first.
If 1st trip DTC cannot be confirmed, perform “Procedure for
malfunction B”.
NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch “OFF” and wait at least 5 seconds before conducting
the next test.
SEF399X
Procedure for malfunction A
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-143.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ OR ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Follow the procedure “With CONSULT-II” above.
TROUBLE DIAGNOSIS FOR DTC P0110
EC-140
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