Nissan Titan. Manual — part 253
P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-313
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
Component Description
INFOID:0000000009886722
The EVAP control system pressure sensor (2) detects pressure in the purge line. The sensor output voltage to
the ECM increases as pressure increases.
On Board Diagnosis Logic
INFOID:0000000009886723
NOTE:
If DTC P0451 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to
.
DTC Confirmation Procedure
INFOID:0000000009886724
NOTE:
Never remove fuel filler cap during 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.
With CONSULT>>GO TO 2.
Without CONSULT>>GO TO 5.
2.
PERFORM DTC CONFIRMATION PROCEDURE-1
With CONSULT
1. Start engine and let it idle for least 40 seconds.
1
: Drain filter
3
: EVAP canister
4
: EVAP canister vent control value
ALBIA0401ZZ
PBIB1207E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0451
0451
EVAP control system pressure
sensor performance
ECM detects a sloshing signal from the
EVAP control system pressure sensor
• Harness or connectors
• EVAP control system pressure sensor
EC-314
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
NOTE:
Do not depress accelerator pedal even slightly.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> GO TO 3.
3.
PERFORM DTC CONFIRMATION PROCEDURE-2
With CONSULT
1. Select “EVAP DIAG READY” in “DATA MONITOR” mode of “ENGINE”.
2. Let it idle until “OFF” of “EVAP DIAG READY” changes to “ON”.
NOTE:
It will take at most 2 hours until “OFF” of “EVAP DIAG READY” changes to “ON”.
3. Turn ignition switch OFF and wait at least 90 minutes.
NOTE:
Never turn ignition switch ON during 90 minutes.
4. Turn ignition switch ON.
5. Select “EVAP LEAK DIAG” in “DATA MONITOR” mode of “ENGINE”.
6. Check that “EVAP LEAK DIAG” indication.
Which is displayed on CONSULT?
CMPLT >> GO TO 4.
YET
>> 1. Perform DTC CONFIRMATION PROCEDURE again.
2. GO TO 1.
4.
PERFORM DTC CONFIRMATION PROCEDURE-3
With CONSULT
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
5.
PERFORM DTC CONFIRMATION PROCEDURE-4
With GST
1. Start engine and let it idle for least 40 seconds.
NOTE:
Do not depress accelerator pedal even slightly.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> GO TO 6.
6.
PERFORM DTC CONFIRMATION PROCEDURE-5
With GST
1. Let it idle for at least 2 hours.
2. Turn ignition switch OFF and wait at least 90 minutes.
NOTE:
Never turn ignition switch ON during 90 minutes.
3. Turn ignition switch ON.
4. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009886725
1.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body.
P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
EC-315
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
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OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR FOR WATER
1. Disconnect EVAP control system pressure sensor (2) 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-315, "Component Inspection"
OK or NG
OK
>> GO TO 4.
NG
>> Replace EVAP control system pressure sensor.
4.
CHECK INTERMITTENT INCIDENT
GI-39, "How to Check Terminal"
GI-42, "Intermittent Incident"
For wiring diagram, refer to
>> INSPECTION END
Component Inspection
INFOID:0000000009886726
EVAP CONTROL SYSTEM PRESSURE SENSOR
1. Remove EVAP control system pressure sensor with its harness connector connected from EVAP canister.
Always replace O-ring with a new one.
2. Install a vacuum pump to EVAP control system pressure sensor.
BBIA0354E
1
: Drain filter
3
: EVAP canister
4
: EVAP canister vent control value
Water should not exist.
ALBIA0401ZZ
EC-316
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
P0451 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 (-700 mmHg, -27.56 inHg) or
pressure over 101.3 kPa (760 mmHg, 29.92 inHg).
4. If NG, replace EVAP control system pressure sensor.
Applied vacuum kPa
(mmHg, inHg)
Voltage V
Not applied
1.8 - 4.8
-26.7 (-200, -7.87)
2.1 to 2.5V lower than above value
PBIB1173E
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