P0451
P0451 EVAP CONTROL SYSTEM PRESSURE SENSOR
DTC Logic
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
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.
NOTE:
Do not depress accelerator pedal even slightly.
2.Check 1st trip DTC.
Is 1st trip DTC detected?
YES- Proceed to "Diagnosis Procedure" .
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.
Revision: March 20122013 Infiniti JX
2.GO TO 1.
4. PERFORM DTC CONFIRMATION PROCEDURE-3
With CONSULT
Check 1st trip DTC.
Is 1st trip DTC detected?
YES- Proceed to "Diagnosis Procedure" .
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 "Diagnosis Procedure" .
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 "Diagnosis Procedure" .
NO- INSPECTION END
Diagnosis Procedure
1. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR FOR WATER
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 2.
NO- Repair or replace error-detected parts.
2. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY
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 4.
NO- GO TO 3.
3. CHECK SENSOR POWER SUPPLY 2 CIRCUIT
Check sensor power supply 2 circuit. Refer to "Diagnosis Procedure" Testing and Inspection.
Is the inspection result normal?
YES- Perform the trouble diagnosis for power supply circuit.
NO- Repair or replace error-detected parts.
Revision: March 20122013 Infiniti JX
4. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT
1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Check the continuity between EVAP control system pressure sensor harness connector and ECM harness connector.
4.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 5.
NO- Repair or replace error-detected parts.
5. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Check EVAP control system pressure sensor. Refer to "Component Inspection" .
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- Replace EVAP control system pressure sensor. Refer to "Exploded View" Exploded View.
Component Inspection
1. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
1.Turn ignition switch OFF.
2.Remove EVAP control system pressure sensor with its harness connector. Refer to "Exploded View" Exploded View.
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 terminals under the following conditions.
CAUTION:
- Always calibrate the vacuum pump gauge when using it.
22
- Never apply below -93.3 kPa (-0.952 kg/cm, -13.53 psi) or pressure over 101.3 kPa (1.033 kg/cm, 14.69 psi).
Is the inspection result normal?
YES- INSPECTION END
NO- Replace EVAP control system pressure sensor. Refer to "Exploded View" Exploded View.
Revision: March 20122013 Infiniti JX