P0448
P0448 EVAP CANISTER VENT CONTROL VALVE
DTC Logic
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1. PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following 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.
- GO TO 2.
2. PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1.Turn ignition switch ON and wait at least 5 seconds.
2.Turn ignition switch OFF and wait at least 10 seconds.
3.Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT.
4.Start engine and let it idle for at least 1 minute.
5.Repeat next procedures 3 times.
-Increase the engine speed up to 3,000 to 3,500 rpm and keep it for 2 minutes and 50 seconds to 3 minutes.
Never exceed 3 minutes.
-Fully released accelerator pedal and keep engine idle for about 5 seconds.
6.Repeat next procedure 20 times.
-Quickly increase the engine speed up to 4,000 to 4,500 rpm or more and keep it for 25 to 30 seconds.
-Fully released accelerator pedal and keep engine idle for at least 35 seconds.
7.Check 1st trip DTC.
Is 1st trip DTC detected?
YES- Proceed to "Diagnosis Procedure" .
NO- INSPECTION END
Diagnosis Procedure
1. CHECK RUBBER TUBE
1.Turn ignition switch OFF.
Revision: March 20122013 Infiniti JX
2.Disconnect rubber tube connected to EVAP canister vent control valve.
3.Check the rubber tube for clogging.
Is the inspection result normal?
YES- GO TO 2.
NO- Clean rubber tube using an air blower.
2. CHECK EVAP CANISTER VENT CONTROL VALVE
Check EVAP canister vent control valve. Refer to "Component Inspection" .
Is he inspection result normal?
YES- GO TO 3.
NO- Replace EVAP canister vent control valve. Refer to "Exploded View" Exploded View.
3. CHECK IF EVAP CANISTER SATURATED WITH WATER
1.Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached. Refer to "Exploded View" Exploded View.
2.Check if water will drain from the EVAP canister.
Does water drain from the EVAP canister?
YES- GO TO 4.
NO- GO TO 6.
4. CHECK EVAP CANISTER
Weigh the EVAP canister with the EVAP canister vent control valve and EVAP control system pressure sensor attached.
Is the inspection result normal?
YES- GO TO 6.
NO- GO TO 5.
5. DETECT MALFUNCTIONING PART
Check the following.
- EVAP canister for damage
- EVAP hose between EVAP canister and vehicle frame for clogging or poor connection
- Repair hose or replace EVAP canister. Refer to "Exploded View" Exploded View.
6. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR 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 7.
NO- Replace EVAP control system pressure sensor. Refer to "Exploded View" Exploded View.
7. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Check EVAP control system pressure sensor. Refer to "Component Inspection" P0451.
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.
Revision: March 20122013 Infiniti JX
Component Inspection
1. CHECK EVAP CANISTER VENT CONTROL VALVE-I
1.Remove EVAP canister vent control valve from EVAP canister. Refer to "Exploded View" Exploded View.
2.Check portion (A) of EVAP canister vent control valve for rust.
Is it rusted?
YES- Replace EVAP canister vent control valve. Refer to FL15, "Exploded View".
NO- GO TO 2.
2. CHECK EVAP CANISTER VENT CONTROL VALVE-II
With CONSULT
1.Reconnect harness connectors disconnected.
2.Turn ignition switch ON.
3.Perform "VENT CONTROL/V" in "ACTIVE TEST" mode.
4.Check air passage continuity and operation delay time.
Check that new O-ring is installed properly.
Without CONSULT
1.Disconnect EVAP canister vent control valve harness connector.
2.Check air passage continuity and operation delay time under the following conditions.
Check that new O-ring is installed properly.
Is the inspection result normal?
YES- INSPECTION END
NO- GO TO 3.
3. CHECK EVAP CANISTER VENT CONTROL VALVE-III
With CONSULT
1.Clean the air passage [portion (A) to (B)] of EVAP canister vent control valve using an air blower.
2.Perform "VENT CONTROL/V" in "ACTIVE TEST" mode.
Revision: March 20122013 Infiniti JX
3.Check air passage continuity and operation delay time.
Check that new O-ring is installed properly.
Without CONSULT
1.Clean the air passage [portion (A) to (B)] of EVAP canister vent control valve using an air blower.
2.Check air passage continuity and operation delay time under the following conditions.
Check that new O-ring is installed properly.
Is the inspection result normal?
YES- INSPECTION END
NO- Replace EVAP canister vent control valve. Refer to "Exploded View" Exploded View.
Revision: March 20122013 Infiniti JX