Nissan Maxima. Instruction — part 466
EC-348
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
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:0000000010095030
Regarding Wiring Diagram information, refer to
.
1.
CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9. 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 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 sen-
sor 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
E10
95
(Fuel tank temperature sensor signal)
104
(Sensor ground)
EVAP control system pressure sensor
Ground
Voltage (V)
Connector
Terminal
B41
3
Ground
Approx. 5
PBIB0138E
P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-349
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
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Is the inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors B29, E29
• Harness for open or short between EVAP control system pressure sensor and ECM
>> 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.
• Crankshaft position sensor (POS) (Refer to
EC-299, "Component Inspection"
• Refrigerant pressure sensor (Refer to
.)
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Replace malfunctioning components.
8.
CHECK APP SENSOR
EC-469, "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. Refer to
ACC-3, "Removal and Installation"
.
2. Refer to
EC-469, "Special Repair Requirement"
>> INSPECTION END
10.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND
SHORT
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.
EVAP control system pressure sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
B41
3
E10
91
Existed
ECM
Sensor
Connector
Terminal
Name
Connector
Terminal
F13
72
Refrigerant pressure sensor
E219
1
76
CKP sensor (POS)
F30
1
E10
87
APP sensor
E40
6
91
EVAP control system pressure sensor
B41
3
EC-350
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> GO TO 11.
11.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors B10, E29
• Harness for open or short between EVAP control system pressure sensor and ECM
>> Repair open circuit, short to ground or short to power in harness or connectors.
12.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND
SHORT
1. Check the continuity between EVAP control system pressure sensor harness connector and ECM har-
ness connector.
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 14.
NO
>> GO TO 13.
13.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors B10, E29
• Harness for open or short between EVAP control system pressure sensor and ECM
>> Repair open circuit, short to ground or short to power in harness or connectors.
14.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-350, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 15.
NO
>> Replace EVAP control system pressure sensor. Refer to
FL-17, "Removal and Installation"
.
15.
CHECK INTERMITTENT INCIDENT
GI-41, "Intermittent Incident"
>> INSPECTION END
Component Inspection
INFOID:0000000010095031
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.
EVAP control system pressure sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
B41
1
E10
96
Existed
EVAP control system pressure sensor
ECM
Continuity
Connector
Terminal
Connector
Terminal
B41
2
E10
86
Existed
P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-351
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
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4. Turn ignition switch ON and check output voltage between ECM
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. Refer to
FL-17, "Removal and Installation"
.
ECM
Applied vacu-
um kPa
(kg/cm
2
, psi)
Voltage
Con-
nector
+
–
Terminal
Terminal
E10
86
(EVAP control
system pressure
sensor signal)
96
(Sensor
ground)
Not applied
1.8 - 4.8 V
-26.7 (-0.272,
-3.87)
2.1 to 2.5 V lower
than above value
JMBIA1871ZZ
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