Infiniti G37 Coupe. Manual — part 531
P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-305
< COMPONENT DIAGNOSIS >
[VQ37VHR]
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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 FOR WATER
1.
Disconnect EVAP control system pressure sensor harness connector.
2.
Check sensor harness connector for water.
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
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 8.
NO
>> GO TO 4.
4.
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 5.
NO
>> Repair short to ground or short to power in harness or connectors.
5.
CHECK COMPONENTS
Check the following.
• Crankshaft position sensor (POS) (Refer to
EC-267, "Component Inspection"
• Brake booster pressure sensor (Refer to
EC-352, "Component Inspection"
• Refrigerant pressure sensor (Refer to
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Replace malfunctioning component.
6.
CHECK APP SENSOR
EC-460, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 9.
Water should not exist.
EVAP control system
pressure sensor
Ground
Voltage
Connector
Terminal
B30
3
Ground
Approx. 5V
ECM
Sensor
Connector
Terminal
Name
Connector
Terminal
F101
45
Brake booster pressure sensor
E48
1
46
CKP sensor (POS)
F2
1
M107
103
APP sensor
E112
6
107
EVAP control system pressure sensor
B30
3
111
Refrigerant pressure sensor
E77
3
EC-306
< COMPONENT DIAGNOSIS >
[VQ37VHR]
P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
NO
>> GO TO 7.
7.
REPLACE ACCELERATOR PEDAL ASSEMBLY
1.
Replace accelerator pedal assembly
2.
Go to
EC-460, "Special Repair Requirement"
.
>> INSPECTION END
8.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-306, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Replace EVAP control system pressure sensor.
9.
CHECK INTERMITTENT INCIDENT
GI-38, "Intermittent Incident"
>> INSPECTION END
Component Inspection
INFOID:0000000001734127
1.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
1.
Turn ignition switch OFF.
2.
Remove EVAP control system pressure sensor with its harness connector connected from EVAP canister.
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 and ground under the
following conditions.
CAUTION:
• Always calibrate the vacuum pump gauge when using it.
• Do not 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
Ground
Condition
[Applied vacuum kPa (kg/cm
2
, psi)]
Voltage
Connector
Terminal
M107
102
Ground
Not applied
1.8 - 4.8V
-26.7 (-0.272, -3.87)
2.1 to 2.5V lower than above value
P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-307
< COMPONENT DIAGNOSIS >
[VQ37VHR]
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EC
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P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
Description
INFOID:0000000001910884
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:0000000001734129
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing 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.
Make sure that “FUEL T/TMP SE” is more than 0
°
C (32
°
F).
8.
Start engine and wait at least 20 seconds.
9.
Check 1st trip DTC.
PBIB3370E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0452
EVAP control system
pressure sensor low in-
put
An excessively low voltage from the sensor is
sent to ECM.
• Harness or connectors
(EVAP control system pressure sensor
circuit is open or shorted.)
[CKP sensor (POS) circuit is shorted.]
(APP sensor 2 circuit is shorted.)
(Refrigerant pressure sensor circuit is
shorted.)
(Brake booster pressure sensor circuit is
shorted)
• EVAP control system pressure sensor
• Crankshaft position sensor (POS)
• Accelerator pedal position sensor
• Refrigerant pressure sensor
• Brake booster pressure sensor
EC-308
< COMPONENT DIAGNOSIS >
[VQ37VHR]
P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
With GST
1.
Start engine and warm it up to normal operating temperature.
2.
Set voltmeter probes to ECM harness connector and ground as follows.
3.
Make sure that the voltage is less than 4.2V.
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:0000000001734130
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 CONNECTOR
1.
Disconnect EVAP control system pressure sensor harness connector.
2.
Check sensor harness connector for water.
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
Ground
Connector
Terminal
M107
106
(Fuel tank temperature sensor signal)
Ground
Water should not exist.
EVAP control system
pressure sensor
Ground
Voltage
Connector
Terminal
B30
3
Ground
Approx. 5V
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