P0440

NOTE: If both DTC P0440 and P0446 are displayed, perform TROUBLE DIAGNOSIS FOR DTC P0446 first.




ON BOARD DIAGNOSIS LOGIC
This diagnosis allows leak detection in the EVAP purge line to be accomplished using two methods.
One is the pressure test which utilizes vapor pressure in the fuel tank. The other is the vacuum test utilizing the engine intake manifold vacuum.

Pressure Test
The EVAP canister vent control valve is closed to shut the EVAP purge line off. The vacuum cut valve bypass valve will then be opened to clear the line between the fuel tank and the EVAP canister purge control valve. The EVAP control system pressure sensor can now monitor the pressure inside the fuel tank.
When no pressure rise is observed, carry out the vacuum test. If pressure rise is observed, conduct leak detection check on the line between the vacuum cut valve and EVAP canister purge control valve, under the "Pressure test" condition.

Vacuum Test
In the event of no pressure rise being observed in the "Pressure test", conduct the alternative leak detection check. This check, on the line between the fuel tank and EVAP canister purge control valve, is accomplished under the "Vacuum test" condition.
The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge control valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control valve and EVAP canister purge control valve are opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge control valve and EVAP canister purge volume control valve will be closed.




CAUTION:
- Use only a genuine fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the MIL may come on.
- If the fuel filler cap is not tightened properly, the MIL may come on.
- Use only a genuine rubber tube as a replacement.

DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE
With Consult

CAUTION:
- Always select "SINGLE TEST" with CONSULT when performing the "FUNCTION TEST".
- Perform "FUNCTION TEST" when the fuel level is less than 314 full. If not, inspect fuel filler cap and fuel tank separately.

(1) Select "EVAP (SMALL LEAK)" in "FUNCTION TEST" mode with CONSULT Follow the instruction displayed.
(2) Make sure that "OK" is displayed with "EVAP (SMALL LEAK)". (If "NG" is displayed, refer to "DIAGNOSTIC PROCEDURE".

OR

Without Consult
(1) Start engine and warm it up sufficiently.
(2) Turn ignition switch "OFF" and wait at least 5 seconds.
(3) Turn ignition switch "ON" and wait at least 12 seconds.




(4) Check voltage between ECM terminal (52) and ground

(Voltage 1).
Voltage: 1.9 - 4.2V

(5) Restart engine and let it idle for at least 70 seconds.
(6) Maintain the following conditions for at least 80 seconds.

Gear position: Suitable gear position
Vehicle speed: 40 - 80 km/h (25 - 50 MPH)
Engine speed: 1,500 - 2,500 rpm
Engine coolant temperature: Less than 100°C (212°F)

(7) Stop the vehicle and let engine at idle.
(8) Maintain the following conditions for at least 2 seconds.

Gear position: Suitable gear position
Vehicle speed: 40 - 60 km/h (25 - 37 MPH)
Engine speed: 1,500 - 2,500 rpm
Engine coolant temperature: Less than 100°C (212°F)

(9) Perform steps 7,8 more than 10 times.
(10) Decelerate the vehicle to idle and wait at least it) seconds.




(11) Check voltage between ECM terminal (52)and ground (Voltage 2).

Voltage: 1.9 - 4.2V

(12) Check voltage decrease between voltage 1 and 2.

Voltage 2 - Voltage 1 >=0.01V

(13) Maintain the following conditions for 9 minutes after 12 minutes have passed from restarting engine in step 5.

Gear position: Suitable gear position
Vehicle speed: 20 - 80 km/h (12 - 50 MPH)
Engine speed: 800 - 3,500 rpm
Engine coolant temperature: Less than 100°C (212°F)

(14) Stop the vehicle, turn ignition switch "OFF", wait at least 5 seconds, and then turn "ON".
(15) Perform "Diagnostic Test Mode II (Self-diagnostic results)" with ECM.

NOTE:
- Hold the accelerator pedal as steady as possible during driving in steps 6, 8 and 13.
- It is better that the fuel level is low.







DIAGNOSTIC PROCEDURE

COMPONENT INSPECTION

EVAP Canister Purge Volume Control Valve

With Consult
1. Disconnect EVAP canister purge volume control valve harness connector.




2. Check resistance between the following terminals. terminal 2 and terminals 1 terminal and terminals.

Resistance: Approximately 30 ohms [At 25°C (77°F)]

3. Reconnect EVAP canister purge volume control valve harness connector.
4. Remove EVAP canister purge volume control valve from intake manifold collector and disconnect hoses from the valve. (Plug the purge hoses. The EVAP canister purge volume control valve harness connector should remain connected.)
5. Turn ignition switch "ON".




6. Perform "PURG VOL CONTN" in "ACTIVE TEST" mode with CONSULT and ensure the EVAP canister purge volume control valve shaft smoothly moves forward and backward according to the valve opening.
If NG, replace the EVAP canister purge volume control valve.

OR

Without Consult
1. Disconnect EVAP canister purge volume control valve harness connector.
2. Check resistance between the following terminals.
terminal (2) and terminals (1), (3)
terminal (5) and terminals (4), (6)

Resistance: Approximately 30 ohms [At 25°C (77°F)]

3. Reconnect EVAP canister purge volume control valve harness connector.
4. Remove EVAP canister purge volume control valve from intake manifold collector and disconnect hoses from the valve. (Plug the purge hoses. The EVAP canister purge volume control valve harness connector should remain connected.)







5. Turn ignition switch "ON" and "OFF" and ensure the EVAP canister purge volume control valve shaft smoothly moves forward and backward according to the ignition switch position.
If NG, replace the EVAP canister purge volume control valve.

EVAP Canister Purge Control Solenoid Valve







Check air passage continuity.
If NG, replace solenoid valve.

EVAP Canister Purge Control Valve
Check EVAP canister purge control valve as follows:




1. Blow air in port (A), B and (c) then ensure that there is no leakage.
2. Apply vacuum to port (A). [Approximately -13.3 to -20.0 kPa (-100 to -150 mmHg, -3.94 to -5.91 inHg)]
Blow air in port (C) and ensure free flow out of port (B).

EVAP Canister Vent Control Valve
Check air passage continuity.




Condition / Air passage continuity between (A) and (B)
12V direct current supply between terminals (1) and (2) / No
No Supply / Yes

If NG, clean valve using air blower or replace as necessary.
Make sure new O-ring is installed properly.

Absolute Pressure Sensor
1. Remove absolute pressure sensor from bracket with its harness connector connected.
2. Remove hose from absolute pressure sensor.




3. Apply vacuum and pressure to absolute pressure sensor as shown in figure.
4. Check output voltage between terminal (2) and engine ground.

Pressure (Absolute pressure) / Voltage (V)
106.6 kPa (800 mmHg. 31.50 inHg) / Approximately 4.6
13.3 kPa (100 mmHg. 3.94 inHg) / Approximately 0.5

CAUTION: Always calibrate the vacuum pump gauge when using it.

5. If NG, replace absolute pressure sensor.

MAP/BARO Switch Solenoid Valve

With Consult
1. Start engine and warm it up sufficiently.
2. Perform "MAP/BARO SWN" in "ACTIVE TEST" mode with CONSULT.
3. Make sure of the following.




- When selecting "MAP", "ABSOL PRES/SE" indicates approximately 1.3V.




- When selecting "BARO", "ABSOL PRES/SE" indicates approximately 4.3V.
4. If NG, check solenoid valve below.

OR

Without Consult
1. Remove MAP/BARO switch solenoid valve.







2. Check air passage continuity.
3. If NG, replace solenoid valve.

Tank Fuel Temperature Sensor
Check resistance as shown in the figure.





Temperature °C (°F) / Resistance K Ohms
20 (68) / 2.3 - 2.7
50 (122) / 0.79 - 0.90

If NG, replace tank fuel temperature sensor.