P0441

P0441 EVAP Control System

System Description

NOTE:

If DTC P0441 is displayed with other DTC such as P2122, P2123, P2127, P2128 or P2138, first perform trouble diagnosis for other DTC.





In this evaporative emission (EVAP) control system, purge flow occurs during non-closed throttle conditions. Purge volume is related to air intake volume. Under normal purge conditions (non-closed throttle), the EVAP canister purge volume control solenoid valve is open to admit purge flow. Purge flow exposes the EVAP control system pressure sensor to intake manifold vacuum.

On Board Diagnosis Logic

Under normal conditions (non-closed throttle), sensor output voltage indicates if pressure drop and purge flow are adequate. If not, a malfunction is determined.






DTC Confirmation Procedure

CAUTION:

Always drive vehicle at a safe speed.

NOTE:

If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next step.

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.

TESTING CONDITION:

Always perform test at a temperature of 5 °C (41 °F) or more.

with SDT

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 Turn ignition switch OFF and wait at least 10 seconds.
5 Start engine and let it idle for at least 70 seconds.
6 Select "PURG FLOW P0441" of "EVAPORATIVE SYSTEM" in "DTC CONFIRMATION" mode with SDT.
7 Touch "START".
If "COMPLETED" is displayed, go to step 7.
8 When the following conditions are met, "TESTING" will be displayed on the SDT screen. Maintain the conditions continuously until "TESTING" changes to "COMPLETED". (It will take at least 35 seconds.)






If "TESTING" does not change for a long time, retry from step 2.
9 Check that "OK" is displayed after touching "DTC check". If "NG" is displayed, refer to "Diagnosis Procedure".

Overall Function Check

Use this procedure to check the overall monitoring function of the EVAP control system purge flow monitoring. During this check, a 1st trip DTC might not be confirmed.

with GST

1 Lift up drive wheels.
2 Start engine (TCS switch or VDC switch OFF) and warm it up to normal operating temperature.
3 Turn ignition switch OFF, wait at least 10 seconds.
4 Turn ignition switch ON.
5 Turn ignition switch OFF, wait at least 10 seconds.
6 Start engine and wait at least 70 seconds.
7 Set voltmeter probes to ECM terminals 32 (EVAP control system pressure sensor signal) and ground.





8 Check EVAP control system pressure sensor value at idle speed and note it.
9 Establish and maintain the following conditions for at least 1 minute.






10 Verify that EVAP control system pressure sensor value stays 0.1 V less than the value at idle speed (measured at step 6) for at least 1 second.
11 If NG, go to "Diagnosis Procedure".

Diagnosis Procedure

1. CHECK EVAP CANISTER

1 Turn ignition switch OFF.
2 Check EVAP canister for cracks.

OK or NG
OK (With SDT)
GO TO 2.
OK (Without SDT)
GO TO 3.
NG
ERROR! Unknown action!Replace EVAP canister. Refer to [EVAP Canister: Removal and Installation] Service and Repair.

2. CHECK PURGE FLOW

With SDT
1 Disconnect vacuum hose connected to EVAP canister purge volume control solenoid valve at EVAP service port and install vacuum gauge. For the location of EVAP service port, refer to [Evaporative Emission System: Description [VQ40DE] Description and Operation ].
2 Start engine and let it idle.
3 Select "PURG VOL CONT/V" in "Active test" mode with SDT.
4 Rev engine up to 2,000 rpm.
5 Touch "Qd" and "Qu" on SDT screen to adjust "PURG VOL CONT/V" opening and check vacuum existence.






OK or NG
OK
GO TO 7.
NG
GO TO 4.

3. CHECK PURGE FLOW

Without SDT
1 Start engine and warm it up to normal operating temperature.
2 Stop engine.
3 Disconnect vacuum hose connected to EVAP canister purge volume control solenoid valve at EVAP service port and install vacuum gauge. For the location of EVAP service port, refer to [Evaporative Emission System: Description [VQ40DE] Description and Operation ].
4 Start engine and let it idle.
Do not depress accelerator pedal even slightly.
5 Check vacuum gauge indication before 60 seconds pass after starting engine.






6 Rev engine up to 2,000 rpm after 100 seconds pass after starting engine.






OK or NG
OK
GO TO 7.
NG
GO TO 4.

4. CHECK EVAP PURGE LINE

1 Turn ignition switch OFF.
2 Check EVAP purge line for improper connection or disconnection.
Refer to [Evaporative Emission System: Description [VQ40DE] Description and Operation ].

OK or NG
OK
GO TO 5.
NG
Repair it.

5. CHECK EVAP PURGE HOSE AND PURGE PORT

1 Disconnect purge hoses connected to EVAP service port (A) and EVAP canister purge volume control solenoid valve (B).





2 Blow air into each hose and EVAP purge port (C).
3 Check that air flows freely.






OK or NG
OK (With SDT)
GO TO 6.
OK (Without SDT)
GO TO 7.
NG
ERROR! Unknown action!Repair or clean hoses and/or purge port.

6. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

With SDT
1 Start engine.
2 Perform "PURG VOL CONT/V" in "Active test" mode with SDT. Check that engine speed varies according to the valve opening.

OK or NG
OK
GO TO 8.
NG
GO TO 7.

7. CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to [P0444, P0445 EVAP Canister Purge Volume Control Solenoid Valve] P0444.

OK or NG
OK
GO TO 8.
NG
Replace EVAP canister purge volume control solenoid valve. Refer to [Intake Manifold Collector: Exploded View] Intake Manifold Collector Exploded View.

8. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR

1 Disconnect EVAP control system pressure sensor harness connector.
2 Check connectors for water.






OK or NG
OK
GO TO 9.
NG
Replace EVAP control system pressure sensor. Refer to [EVAP Canister: Removal and Installation] Service and Repair.

9. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR FUNCTION

Refer to [P0452 EVAP Control System Pressure Sensor] P0452 for DTC P0452, [P0453 EVAP Control System Pressure Sensor] P0453 for P0453.

OK or NG
OK
GO TO 10.
NG
Replace EVAP control system pressure sensor. Refer to [EVAP Canister: Removal and Installation] Service and Repair.

10. CHECK RUBBER TUBE FOR CLOGGING

1 Disconnect rubber tube connected to EVAP canister vent control valve.
2 Check the rubber tube for clogging.

OK or NG
OK
GO TO 11.
NG
Clean the rubber tube using an air blower.

11. CHECK DRAIN FILTER

Refer to "Component Inspection".

OK or NG
OK
GO TO 10.
NG
Replace drain filter.

12. CHECK EVAP CANISTER VENT CONTROL VALVE

Refer to [P0447 EVAP Canister Vent Control Valve] P0447.

OK or NG
OK
GO TO 13.
NG
Replace EVAP canister vent control valve. Refer to [EVAP Canister: Removal and Installation] Service and Repair.

13. CHECK EVAP PURGE LINE

Inspect EVAP purge line (pipe and rubber tube). Check for evidence of leaks.

Refer to [Evaporative Emission System: Description [VQ40DE] Description and Operation ].

OK or NG
OK
GO TO 14.
NG
Replace it.

14. CLEAN EVAP PURGE LINE

Clean EVAP purge line (pipe and rubber tube) using air blower.


GO TO 15.

15. CHECK INTERMITTENT INCIDENT

Refer to [Service Information for Electrical Incident: Intermittent Incident] Service Information for Electrical Incident: Intermittent Incident.


INSPECTION END

Component Inspection

Drain Filter

1) Check visually for insect nests in the drain filter air inlet.
2) Check visually for cracks or flaws in the appearance.
3) Check visually for cracks or flaws in the hose.
4) Blow air into port A and check that it flows freely out of port B.





5) Block port B.
6) Blow air into port A and check that there is no leakage.
7) If NG, replace drain filter.