Infiniti I35 (A33). Manual — part 260
9
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
1. Remove EVAP control system pressure sensor with its harness connector connected.
CAUTION:
Never apply force to the air hole protector of the sensor if equipped.
SEF799W
2. Remove hose from EVAP control system pressure sensor.
3. Turn ignition switch ON.
4. Use pump to apply vacuum and pressure to EVAP control system pressure sensor as shown in figure.
CAUTION:
I
Always calibrate the vacuum pump gauge when using it.
I
Do not apply below −20 kPa (−150 mmHg, −5.91 inHg) or over 20 kPa (150 mmHg, 5.91 inHg) of pressure.
5. Check input voltage between ECM terminal 60 and ground.
SEC908C
MTBL1159
CAUTION:
Discard and EVAP control system pressure sensor which has been dropped from a height of more than 0.5 m
(19.7 in) onto a hard surface such as a concrete floor; use a new one.
OK or NG
OK
©
GO TO 10.
NG
©
Replace EVAP control system pressure sensor.
10
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-152.
©
INSPECTION END
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DTC P0452 EVAP SYSTEM PRESSURE SENSOR
Diagnostic Procedure (Cont’d)
EC-381
SEF053V
SEF954S
Component Description
NHEC0977
The EVAP control system pressure sensor detects pressure in the
purge line. The sensor output voltage to the ECM increases as
pressure increases. The EVAP control system pressure sensor is
not used to control the engine system. It is used only for on board
diagnosis.
CONSULT-II Reference Value in Data Monitor
Mode
NHEC0978
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
EVAP SYS PRES
I
Ignition switch: ON
Approx. 3.4V
On Board Diagnosis Logic
NHEC0980
NOTE:
If DTC P0453 is displayed with DTC P1229, first perform the trouble diagnosis for DTC P1229. Refer to
EC-539.
DTC No.
Trouble diagnosis
name
DTC Detecting Condition
Possible Cause
P0453
0453
EVAP control system
pressure sensor high
input
An excessively high voltage from the sensor is
sent to ECM.
I
Harness or connectors
(The sensor circuit is open or
shorted.)
I
EVAP control system pressure sensor
I
EVAP canister vent control valve
I
EVAP canister
I
Water separator
I
Rubber hose from EVAP canister vent
control valve to water separator
DTC P0453 EVAP SYSTEM PRESSURE SENSOR
Component Description
EC-382
DTC Confirmation Procedure
=NHEC0981
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.
TESTING CONDITION:
Always perform test at a temperature of 5°C (41°F) or more.
SEF194Y
WITH CONSULT-II
NHEC0981S01
1)
Start engine and warm it up to normal operating temperature.
2)
Turn ignition switch OFF and wait at least 10 seconds.
3)
Turn ignition switch ON.
4)
Select “DATA MONITOR” mode with CONSULT-II.
5)
Make sure that “FUEL T/TEMP SE” is more than 0°C (32°F).
6)
Start engine and wait at least 20 seconds.
7)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-385.
SEC907C
WITH GST
NHEC0981S02
1)
Start engine and warm it up to normal operating temperature.
2)
Check that voltage between ECM terminal 75 (Fuel tank tem-
perature sensor signal) and ground is less than 4.2V.
3)
Turn ignition switch OFF and wait at least 10 seconds.
4)
Start engine and wait at least 20 seconds.
5)
Select “MODE 7” with GST.
6)
If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-385.
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DTC P0453 EVAP SYSTEM PRESSURE SENSOR
DTC Confirmation Procedure
EC-383
Wiring Diagram
NHEC0982
MEC636E
SEF623XE
DTC P0453 EVAP SYSTEM PRESSURE SENSOR
Wiring Diagram
EC-384
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