EVAP SYSTEM (SMALL LEAK)

NOTE: If both DTC P0440 and P1448 are displayed, perform TROUBLE DIAGNOSIS FOR DTC P1448 first.









ON BOARD DIAGNOSIS LOGIC
This diagnosis detects leaks in the EVAP purge line using of engine intake manifold vacuum.

If pressure does not increase, the ECM will check for leaks in the tine between the fuel tank and EVAP canister purge volume control solenoid valve, under the following "Vacuum test" conditions.

The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this occurs, the EVAP canister purge volume control solenoid 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

NOTE:
- If both DTC P0440 and P1448 are displayed, perform TROUBLE DIAGNOSIS FOR DTC P1448 first.
- If "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch "OFF" and wait at least 5 seconds before conducting the next test.
- Make sure that EVAP hoses are connected to EVAP canister purge volume control solenoid valve properly.

TESTING CONDITION:
Perform "DTC WORK SUPPORT" when the fuel level is less than 314 full and vehicle is placed on flat level surface.

Always perform test at a temperature of 5 to 30°C (41 to 86°F).

It is better that the fuel level is low.












With CONSULT
(1) Turn ignition switch "ON".
(2) Turn ignition switch "OFF" and wait at least 5 seconds.
(3) Turn ignition switch "ON".
(4) Make sure that the following conditions are met.

COOLAN TEMP/S: 0 - 70°C (32 - 158°F)
INT/A TEMP SE: 5 - 60°C (41 - 140°F)

(5) Select "EVAP SML LEAK P0440" of "EVAPORATIVE SYSTEM" in "DTC WORK SUPPORT" mode with CONSULT.
Follow the instruction displayed.

NOTE:
- If the CONSULT screen shown at left is displayed, stop the engine and stabilize the vehicle temperature at a temperature of 25°C (77°F) or cooler. After "TANK F/TMP SE" becomes less than 30°C (86°F), retest. (Use a fan to reduce the stabilization time.)
- This test for the engine idle portion will take approximately 5 minutes.

(6) Make sure that "OK" is displayed.
If "NG" is displayed, refer to "DIAGNOSTIC PROCEDURE".

1 Of 3:

2 Of 3:

3 Of 3:

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), (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".
6. Perform "PURG VOL CONT/V" 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.

EVAP canister purge control solenoid valve
Check air passage continuity.









With CONSULT
Perform "PURG CONT S/V" in "ACTIVE TEST" mode.


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.









With CONSULT
(1) Remove EVAP vent control valve from EVAP canister with its harness connector connected.
(2) Disconnect fresh air vent hose from EVAP vent control valve.
(3) Turn ignition switch "ON".
(4) Perform "VENT CONTROL/V" in "ACTIVE TEST" mode with CONSULT.
If NG, check valve below.






Absolute pressure sensor
1. Turn ignition switch "ON" and check voltage between ECM terminals (51) and (25).
The voltage should be more than 2.6V.

2. Start engine and wait at least 5 seconds and check voltage between ECM terminals (51) and (25).
The voltage should be less than the value measured at step 1.
If NG, go to step 3; if OK, inspection end.

3. Turn ignition switch "OFF".
4. Remove absolute pressure sensor with its harness connector connected.
5. Remove hose from absolute pressure sensor.
6. Turn ignition switch "ON" and check output voltage between terminal (2) and engine ground.
The voltage should be 3.2 to 4.8V.

7. Use pump to apply vacuum of -26.7 kPa (-200 mm Hg, -7.87 inHg) to absolute pressure sensor as shown in figure and check the output voltage.
The voltage should be 1.0 to 1.4V lower than the value measured in step 6.

CAUTION:
- Always calibrate the vacuum pump gauge when using it.
- Do not apply below 93.3 kPa (-700 mmHg, -27.56 inHg) or over 101.3 kPa (760 mmHg, 29.92 inHg) of pressure.

8. If NG, replace absolute pressure sensor.









MAP/BARO switch solenoid valve
1. Turn ignition switch "OFF" and remove MAP/BARO switch solenoid valve.
2. Check air passage continuity.
3. Check the time required for the solenoid valve to switch. It should be less than 1 second.
If NG, replace solenoid valve.









Tank fuel temperature sensor
Check resistance as shown in the figure.
If NG, replace tank fuel temperature sensor.