Nissan Altima L32. Instruction — part 299
P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-317
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
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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 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 sen-
sor harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> GO TO 4.
4.
CHECK SENSOR POWER SUPPLY CIRCUITS
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-281, "Component Inspection"
• Refrigerant pressure sensor (Refer to
.)
• Tumble control valve position sensor (Refer to
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Replace malfunctioning component.
6.
CHECK APP SENSOR
EC-429, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 9.
Water should not exist.
EVAP control system pressure sensor
Ground
Voltage
Connector
Terminal
B41
3
Ground
Approx. 5 V
PBIB0138E
ECM
Sensor
Connector
Terminal
Name
Connector
Terminal
F13
72
Tumble control valve position sensor
F43
1
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-318
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
NO
>> GO TO 7.
7.
REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly
2. Go to
EC-29, "ACCELERATOR PEDAL RELEASED POSITION LEARNING : Special Repair Require-
>> INSPECTION END
8.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-318, "Component Inspection"
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Replace EVAP control system pressure sensor.
9.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
>> INSPECTION END
Component Inspection
INFOID:0000000004349352
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
Condition
[Applied vacuum
kPa (kg/cm
2
, psi)
Voltage
Connector
Terminal
E10
86
(EVAP control system
pressure sensor signal)
Not applied
1.8 - 4.8 V
-26.7 (-0.272, -3.87)
2.1 to 2.5 V lower
than above value
JMBIA1595ZZ
P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-319
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[QR25DE FOR CALIFORNIA]
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EC
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P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
Description
INFOID:0000000004349353
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:0000000004349354
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
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.
>> 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. Select “DATA MONITOR” mode with CONSULT-III.
5. Make sure that “FUEL T/TMP SE” is more than 0
°C (32°F).
6. Start engine and wait at least 20 seconds.
7. Check 1st trip DTC.
With GST
1. Start engine and warm it up to normal operating temperature.
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.)
[Crankshaft position sensor (POS) circuit
is shorted.)
(Accelerator pedal position sensor circuit
is shorted.)
(Refrigerant pressure sensor circuit is
shorted.)
(Tumble control valve position sensor cir-
cuit is shorted.)
• EVAP control system pressure sensor
• Crankshaft position sensor (POS)
• Accelerator pedal position sensor
• Refrigerant pressure sensor
• Tumble control valve position sensor
EC-320
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
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. Start engine and wait at least 20 seconds.
6. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000004349355
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 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 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
Ground
Connector
Terminal
E10
95
(Fuel tank temperature sensor signal)
Ground
JMBIA1592ZZ
Water should not exist.
EVAP control system pressure sensor
Ground
Voltage
Connector
Terminal
B41
3
Ground
Approx. 5 V
PBIB0138E
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