Infiniti FX35, FX50 (S51). Manual — part 844
P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-917
< DTC/CIRCUIT DIAGNOSIS >
[VK50VE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
YES
>> GO TO 6.
NO
>> Replace malfunctioning component.
6.
CHECK APP SENSOR
EC-1081, "Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> GO TO 7.
7.
REPLACE ACCELERATOR PEDAL ASSEMBLY
1.
Replace accelerator pedal assembly
2.
EC-1082, "Special Repair Requirement"
.
>> INSPECTION END
8.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-917, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Replace EVAP control system pressure sensor.
9.
CHECK INTERMITTENT INCIDENT
GI-36, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000005237387
1.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
1.
Turn ignition switch OFF.
2.
Remove EVAP control system pressure sensor with its harness connector.
Always replace O-ring with a new one.
3.
Install a vacuum pump to EVAP control system pressure sensor.
4.
Turn ignition switch ON and check output voltage between ECM harness connector terminals under the
following conditions.
CAUTION:
• Always calibrate the vacuum pump gauge when using it.
• Never apply below -93.3 kPa (-0.952 kg/cm
2
, -13.53 psi) or pressure over 101.3 kPa (1.033 kg/cm
2
,
14.69 psi).
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace EVAP control system pressure sensor.
ECM
Condition
[Applied vacuum kPa (kg/cm
2
, psi)]
Voltage (V)
Connector
+
–
Terminal
Terminal
F111
80
70
Not applied
1.8 - 4.8
-26.7 (-0.272, -3.87)
2.1 to 2.5 lower than above value
EC-918
< DTC/CIRCUIT DIAGNOSIS >
[VK50VE]
P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
Description
INFOID:0000000005237388
The EVAP control system pressure sensor detects pressure in the
purge line. The sensor output voltage to the ECM increases as pres-
sure increases.
DTC Logic
INFOID:0000000005237389
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Always perform test at a temperature of 5
°
C (41
°
F) or more.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
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.
4.
Turn ignition switch OFF and wait at least 10 seconds.
5.
Turn ignition switch ON.
6.
Select “DATA MONITOR” mode with CONSULT-III.
7.
Check that “FUEL T/TMP SE” is more than 0
°
C (32
°
F).
8.
Start engine and wait at least 20 seconds.
PBIB3370E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0452
EVAP control system
pressure sensor low input
An excessively low voltage from
the sensor is sent to ECM.
• Harness or connectors
(EVAP control system pressure sensor circuit is open
or shorted.)
(APP sensor 2 circuit is shorted.)
(Battery current sensor circuit is shorted.)
[Camshaft position sensor (bank 1) circuit is shorted.]
(Crankshaft position sensor circuit is shorted.)
[EVT control position sensor (bank 1) circuit is shorted.]
(Manifold absolute pressure sensor circuit is shorted.)
• EVAP control system pressure sensor
• Accelerator pedal position sensor
• Battery current sensor
• Camshaft position sensor (bank 1)
• Crankshaft position sensor
• Exhaust valve timing control position sensor (bank 1)
• Manifold absolute pressure sensor
P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-919
< DTC/CIRCUIT DIAGNOSIS >
[VK50VE]
C
D
E
F
G
H
I
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K
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A
EC
N
P
O
9.
Check 1st trip DTC.
With GST
1.
Start engine and warm it up to normal operating temperature.
2.
Set voltmeter probes to ECM harness connector terminals under the following conditions.
3.
Check that the voltage is less than 4.2 V.
4.
Turn ignition switch OFF and wait at least 10 seconds.
5.
Turn ignition switch ON.
6.
Turn ignition switch OFF and wait at least 10 seconds.
7.
Start engine and wait at least 20 seconds.
8.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005237390
1.
CHECK GROUND CONNECTION
1.
Turn ignition switch OFF.
2.
Check ground connection M95. Refer to Ground Inspection in
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace ground connection.
2.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR
1.
Disconnect EVAP control system pressure sensor harness connector.
2.
Check that water is not inside connectors.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace harness connector.
3.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT-I
1.
Turn ignition switch ON.
2.
Check the voltage between EVAP control system pressure sensor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> GO TO 4.
4.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT-II
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between EVAP control system pressure sensor harness connector and ECM har-
ness connector.
ECM
Connector
+
–
Terminal
Terminal
M160
120
(Fuel tank temperature sensor signal)
128
EVAP control system
pressure sensor
Ground
Voltage (V)
Connector
Terminal
B252
3
Ground
Approx. 5
EC-920
< DTC/CIRCUIT DIAGNOSIS >
[VK50VE]
P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors B201, M117
• Harness connectors M116, F103
• Harness for open between ECM and EVAP control system pressure sensor
>> Repair open circuit.
6.
CHECK SENSOR POWER SUPPLY CIRCUIT
Check harness for short to power and short to ground, between the following terminals.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair short to ground or short to power in harness or connectors.
7.
CHECK COMPONENTS
Check the following.
• Battery current sensor (Refer to
EC-1025, "Component Inspection"
.)
• Camshaft position sensor (bank 1) (Refer to
EC-881, "Component Inspection"
• Crankshaft position sensor (Refer to
EC-876, "Component Inspection"
• Exhaust valve timing control position sensor (bank 1) (Refer to
EC-978, "Component Inspection"
.)
• Manifold absolute pressure sensor (Refer to
EC-785, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Replace malfunctioning component.
8.
CHECK APP SENSOR
EC-1081, "Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 15.
NO
>> GO TO 9.
9.
REPLACE ACCELERATOR PEDAL ASSEMBLY
1.
Replace accelerator pedal assembly
2.
EC-1082, "Special Repair Requirement"
.
EVAP control system
pressure sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
B252
3
F111
95
Existed
ECM
Sensor
Connector
Terminal
Name
Connector
Terminal
F111
87
Crankshaft position sensor
F2
1
91
Camshaft position sensor (bank 1)
F84
1
EVT control position sensor (bank 1)
F59
1
95
Battery current sensor
E21
1
EVAP control system pressure sensor
B252
3
Manifold absolute pressure sensor
F65
3
M160
99
APP sensor 2 (Without ICC)
E112
6
APP sensor 2 (With ICC)
E116
3
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