Code 0705
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 CHART
DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE
CONSULT
Perform the following procedures at a place where the temperature is between 5°C and 30°C (41°F and 86°F).
1. Open engine hood.
2. Turn ignition switch "OFF", wait for at least 5 seconds and then turn "ON".
3. Select "INT/A TEMP SE", "COOLAN TEMP/S" and "TANK F/TM P SE" in "DATA MONITOR" mode with CONSULT.
4. Confirm that all the CONSULT readings match the following.
0°C (32°F) < INT/A TEMP SE < 55°C (131°F)
0°C (32°F) < COOLAN TEMP/S < 70°C (158°F)
0°C (32°F) < TANK F/TMP SE < 45°C (113°F)
If any reading shows a temperature outside the above range, warm up or cool down engine to meet the conditions.
5. Turn ignition switch "OFF", wait for at least 5 seconds.
6. Start engine and run for 12 to 15 minutes at idle speed.
CAUTION: Do not let engine idle for more than 15 minutes.
Perform "TANK F/TMP SE" in "DATA MONITOR" mode with CONSULT. Make sure that the reading shows a temperature of less than 55°C (131°F). If not repeat procedures from step 3.
7. Close the engine hood and select "EVAP (SMALL LEAK)" in "FUNCTION TEST" mode with CONSULT.
8. Make sure that "OK1" or "OK2" is displayed with "EVAP (SMALL LEAK)". (If "NG1" or "NG2" is displayed, refer to "DIAGNOSTIC PROCEDURE".)
9. Check fuel filler cap when the fuel tank is filled more than 3/4 full with gasoline.
Refer to "DIAGNOSTIC PROCEDURE".
OVERALL FUNCTION CHECK
This procedure can be used for checking the overall function of the EVAP control system (Small leak). During this check, a DTC might not be confirmed.
NOTE:
- Prepare one-way valve (Part No. 14958 V6700) for this test.
NO TOOLS
1. Turn ignition switch "OFF".
2. Completely fill fuel tank with gasoline.
3. Set up one-way valve (Part No. 14958 V6700), pressure gauge and suitable pump as shown at left. Pressurize the system to 13.3 kPa (100 mmHg, 3.94 inHg). Observe the amount of depressurization in kPa (mmHg, inHg) after one minute with the system left unattended.
4. Apply 12 volts DC to EVAP canister vent control valve. The valve will now close. (Continue to apply 12V until the end of test.)
5. Apply 12 volts DC to vacuum cut valve bypass valve. The valve will now open. (Continue to apply 12V until the end of test.)
6. Disconnect rubber tube between vacuum cut valve and EVAP shut valve. Set up one-way valve (Part No. 14958 V6700), pressure gauge and suitable pump as shown at left.
7. Increase pump pressure until gauge registers 13.3 kPa (100 mmHg, 3.94 inHg). If pump is rated at a discharge volume of 0.13f (1/8 US qt, 1/8 Imp qt) for one operating stroke, it is capable of increasing pressure to 13.3 kPa (100 mmHg, 3.94 inHg) with approximately 60 operating strokes. If pressure does not increase at all during the test, diagnosis will be ineffective ("NG").
CAUTION: Do not allow pump pressure to exceed 13.3 kPa (100 mmHg, 3.94 inHg). Failure to do so may damage fuel tank and EVAP canister.
8. Make sure that the amount of pressure recovery after one minute is within this value.
4.0 kPa (30 mmHg, 1.18 inHg) + (the value measured in step 3)
9. Check fuel filler cap. Refer to "DIAGNOSTIC PROCEDURE".
COMPONENT INSPECTION
EVAP canister purge volume control valve
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° 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.
OR
NO TOOLS
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 (D).
EVAP canister vent control valve
Check air passage continuity.
If NG, clean valve using air blower or replace as necessary.
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.
5. If NG, replace absolute pressure sensor.
MAP/BARO switch solenoid valve
CONSULT
1. Start engine and warm it up sufficiently.
2. Perform "MAP/BARO SW/V" 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, replace solenoid valve.
OR
NO TOOLS
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.
If NG, replace tank fuel temperature sensor.