Infiniti FX35 / FX45. Manual — part 549
DTC P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-957
< SERVICE INFORMATION >
[VK45DE]
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DTC P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
Component Description
INFOID:0000000001326796
The EVAP control system pressure sensor detects pressure in the purge line. The sensor output voltage to the
ECM increases as pressure increases.
CONSULT-III Reference Value in Data Monitor Mode
INFOID:0000000001326797
Specification data are reference values.
On Board Diagnosis Logic
INFOID:0000000001326798
NOTE:
If DTC P0451 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
.
DTC Confirmation Procedure
INFOID:0000000001326799
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-III
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Start engine and wait at least 40 seconds.
NOTE:
Do not depress accelerator pedal even slightly.
3.
Check 1st trip DTC.
PBIB1522E
PBIB1207E
MONITOR ITEM
CONDITION
SPECIFICATION
EVAP SYS PRES
• Ignition switch: ON
Approx. 1.8 - 4.8V
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0451
0451
EVAP control system
pressure sensor perfor-
mance
ECM detects a sloshing signal from the EVAP
control system pressure sensor
• Harness or connectors
• EVAP control system pressure sensor
EC-958
< SERVICE INFORMATION >
[VK45DE]
DTC P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
4.
If 1st trip DTC is detected, go to
Diagnosis Procedure
INFOID:0000000001326800
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten three ground screws on the body.
Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK EVPA CONTROL SYSTEM PRESSURE SENSOR CONNECTOR FOR WATER
1.
Disconnect EVAP control system pressure sensor harness connector.
2.
Check sensor harness connector for water.
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace harness connector.
3.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-958, "Component Inspection"
OK or NG
OK
>> GO TO 4.
NG
>> Replace EVAP control system pressure sensor.
4.
CHECK INTERMITTENT INCIDENT
.
>> INSPECTION END
Component Inspection
INFOID:0000000001326801
EVAP CONTROL SYSTEM PRESSURE SENSOR
1.
Remove EVAP control system pressure sensor with its harness connector connected from EVAP canister.
PBIB2195E
Water should not exist.
PBIB1522E
DTC P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-959
< SERVICE INFORMATION >
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Always replace O-ring with a new one.
2.
Install a vacuum pump to EVAP control system pressure sensor.
3.
Turn ignition switch ON and check output voltage between ECM
terminal 32 and ground under the following conditions.
CAUTION:
• Always calibrate the vacuum pump gauge when using it.
• Do not apply below -93.3 kPa (- kg/cm
2
, -13.53 psi) or pres-
sure over 101.3 kPa (1.033 kg/cm
2
, 14.69 psi).
4.
If NG, replace EVAP control system pressure sensor.
Applied vacuum kPa
(kg/cm
2
, psi)
Voltage V
Not applied
1.8 - 4.8
-26.7 (-0.272, -3.87)
2.1 to 2.5V lower than above value
PBIB1173E
EC-960
< SERVICE INFORMATION >
[VK45DE]
DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
DTC P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
Component Description
INFOID:0000000001326802
The EVAP control system pressure sensor detects pressure in the purge line. The sensor output voltage to the
ECM increases as pressure increases.
CONSULT-III Reference Value in Data Monitor Mode
INFOID:0000000001326803
Specification data are reference values.
On Board Diagnosis Logic
INFOID:0000000001326804
NOTE:
If DTC P0452 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
.
DTC Confirmation Procedure
INFOID:0000000001326805
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.
WITH CONSULT-III
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.
PBIB1522E
PBIB1207E
MONITOR ITEM
CONDITION
SPECIFICATION
EVAP SYS PRES
• Ignition switch: ON
Approx. 1.8 - 4.8V
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0452
0452
EVAP control system
pressure sensor low in-
put
An excessively low voltage from the sensor is
sent to ECM.
• Harness or connectors
(The sensor circuit is open or shorted.)
• EVAP control system pressure sensor
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