- Purge VSV (Vacuum Switching Valve) stuck closed
- Purge VSV stuck open
- Purge flow
| Last Modified: 11-29-2007 | 1.6 J | |
| Service Category: Engine/Hybrid System | Section: Engine Control | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000000YEQ03JX |
| Title: 3UR-FE ENGINE CONTROL: SFI SYSTEM: RELATED DTCS (2008 Sequoia) | ||
|
EVAP System |
RELATED DTCS
|
DTC No. |
Monitoring Item |
See page |
|---|---|---|
|
P043E |
Reference orifice clogged (built into canister pump module) |
|
|
P043F |
Reference orifice high-flow (built into canister pump module) |
|
|
P0441 |
|
|
|
P0451 |
|
|
|
P0452 |
Canister pressure sensor (built into canister pump module) voltage low |
|
|
P0453 |
Canister pressure sensor (built into canister pump module) voltage high |
|
|
P0455 |
EVAP gross leak |
|
|
P0456 |
EVAP small leak |
|
|
P2401 |
Leak detection pump stuck OFF (built into canister pump module) |
|
|
P2402 |
Leak detection pump stuck ON (built into canister pump module) |
|
|
P2419 |
Vent valve stuck closed (built into canister pump module) |
|
|
P2420 |
Vent valve stuck open (vent) (built into canister pump module) |
|
|
P2610 |
Soak timer (built into ECM) |
|
If any EVAP system DTCs are stored, the malfunctioning area can be determined using the table below.
NOTICE:
If the reference pressure difference between the first and second checks is greater than the specification, all the DTCs relating to the reference pressure (P043E, P043F, P2401, P2402 and P2419) are stored.
DESCRIPTION
NOTICE:
In this vehicle's EVAP system, turning ON the vent valve does not seal off the EVAP system. To check for leaks in the EVAP system, disconnect the air inlet vent hose and apply pressure from the atmospheric side of the canister.
While the engine is running, if a predetermined condition (closed-loop, etc.) is met, the purge VSV is opened by the ECM and stored fuel vapors in the canister are purged into the intake manifold. The ECM changes the duty cycle ratio of the purge VSV to control purge flow volume.
The purge flow volume is also determined by the intake manifold pressure. Atmospheric pressure is allowed into the canister through the vent valve to ensure that the purge flow is maintained when the negative pressure (vacuum) is applied to the canister.
The following two monitors run to confirm the appropriate EVAP system operation.
1. Key-off monitor
This monitor checks for EVAP (Evaporative Emission) system leaks and canister pump module malfunctions. The monitor starts 5 hours* after the ignition switch is turned off. At least 5 hours are required for the fuel to cool down to stabilize the EVAP pressure, thus making the EVAP system monitor more accurate.
The leak detection pump creates negative pressure (vacuum) in the EVAP system and the pressure is measured. Finally, the ECM monitors for leaks from the EVAP system, and malfunctions in both the canister pump module and purge VSV, based on the EVAP pressure.
HINT:
*: If the engine coolant temperature is not below 35°C (95°F) 5 hours after the ignition switch is turned off, the monitor check starts 2 hours later. If it is still not below 35°C (95°F) 7 hours after the ignition switch is turned off, the monitor check starts 2.5 hours later.
2. Purge flow monitor
The purge flow monitor consists of 2 monitors. The 1st monitor is conducted every time and the 2nd monitor is activated if necessary.
-
The 1st monitor
While the engine is running and the purge VSV (Vacuum Switching Valve) is ON (open), the ECM monitors the purge flow by measuring the EVAP pressure change. If negative pressure is not created, the ECM begins the 2nd monitor.
-
The 2nd monitor
The vent valve is turned ON (closed) and the EVAP pressure is measured. If the variation in the pressure is less than 0.5 kPa-g (3.75 mmHg-g), the ECM interprets this as the purge VSV being stuck closed, and illuminates the MIL and stores DTC P0441 (2 trip detection logic).
Atmospheric pressure check:
In order to ensure reliable malfunction detection, the variation between the atmospheric pressures, before and after conduction of the purge flow monitor, is measured by the ECM.
|
Component |
Operation |
|---|---|
|
Canister |
Contains activated charcoal to absorb EVAP (Evaporative Emissions) generated in fuel tank. |
|
Cut-off valve |
Located in fuel tank. Valve floats and closes when fuel tank 100% full. |
|
Purge VSV (Vacuum Switching Valve) |
Opens or closes line between canister and intake manifold. ECM uses purge VSV to control EVAP purge flow. In order to discharge EVAP absorbed by canister to intake manifold, ECM opens purge VSV. EVAP discharge volume to intake manifold controlled by purge VSV duty cycle ratio (current-carrying time) (Open: ON; Closed: OFF). |
|
Refueling valve |
Controls EVAP pressure from fuel tank to canister. Valve consists of diaphragm, spring and restrictor (diameter: 0.08 inch). When fuel vapor and pressure inside fuel tank increase, valve opens. While EVAP purged, valve closes and restrictor prevents large amount of vacuum from affecting pressure in fuel tank. Valve opened while refueling. |
|
Roll-over valve |
Located in fuel tank. Valve closed by its own weight when vehicle overturns to prevent fuel from spilling out. |
|
Soak timer |
Built into ECM. To ensure accurate EVAP monitor, measures 5 hours (+/-15 min) after ignition switch turned off. This allows fuel to cool down, stabilizing EVAP pressure. When approximately 5 hours elapsed, ECM activates (refer to fig. 3). |
|
Canister pump module |
Consists of (a) to (d) below. Canister pump module cannot be disassembled. |
|
(a) Vent valve |
Vents and closes EVAP system. When ECM turns valve ON, EVAP system closed. When ECM turns valve OFF, EVAP system vented. Negative pressure (vacuum) created in EVAP system to check for EVAP leaks by closing purge VSV, turning on vent valve (closed) and operating leak detection pump (refer to fig. 1). |
|
(b) Canister pressure sensor |
Indicates pressure as voltages. ECM supplies regulated 5 V to canister pressure sensor, and uses feedback from sensor to monitor EVAP system pressure (refer to fig. 2). |
|
(c) Leak detection pump |
Creates negative pressure (vacuum) in EVAP system for leak check. |
|
(d) Reference orifice |
Has opening with 0.02 inch diameter. Vacuum produced through orifice by closing purge VSV, turning off vent valve and operating leak detection pump, to monitor reference pressure. Reference pressure indicates small leak of EVAP. |
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
The Techstream is required to conduct the following diagnostic troubleshooting procedure.
HINT:
- Using Techstream monitor results enables the EVAP (Evaporative Emission) system to be confirmed.
- Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
PROCEDURE
|
1. |
CONFIRM DTC |
(a) Turn the ignition switch off and wait for 10 seconds.
(b) Turn the ignition switch to ON.
(c) Turn the ignition switch off and wait for 10 seconds.
(d) Connect the Techstream to the DLC3.
(e) Turn the ignition switch to ON.
(f) Turn the Techstream on.
(g) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(h) Confirm DTCs and freeze frame data.
If any EVAP system DTCs are stored, the malfunctioning area can be determined using the table below.
NOTICE:
If the reference pressure difference between the first and second checks is greater than the specification, all the DTCs relating to the reference pressure (P043E, P043F, P2401, P2402 and P2419) are stored.
|
|
2. |
PERFORM EVAP SYSTEM CHECK (AUTO OPERATION) |
NOTICE:
- The Evaporative System Check (Automatic Mode) consists of 5 steps performed automatically by the Techstream. It takes a maximum of approximately 18 minutes.
- Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed. If the cut-off valve is closed, the fuel tank leak check is not possible.
- Do not run the engine during this operation.
- When the temperature of the fuel is 35°C (95°F) or more, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the temperature below 35°C (95°F).
(a) Clear DTCs
.
(b) Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.
(c) After the Evaporative System Check is completed, check for pending DTCs by entering the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
HINT:
If no pending DTCs are displayed, perform the Monitor Confirmation (see "Diagnostic Help" menu). After this confirmation, check for pending DTCs. If no DTCs are displayed, the EVAP system is normal.
|
|
3. |
PERFORM EVAP SYSTEM CHECK (MANUAL OPERATION) |
NOTICE:
- In the Evaporative System Check (Manual Mode) , perform the series of 5 Evaporative System Check steps manually using the Techstream.
- Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed. If the cut-off valve is closed, the fuel tank leak check is not possible.
- Do not run the engine during this operation.
- When the temperature of the fuel is 35°C (95°F) or more, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the temperature below 35°C (95°F).
(a) Clear DTCs
.
(b) Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Manual Mode.
|
|
4. |
PERFORM EVAP SYSTEM CHECK (STEP 1/5) |
(a) Check the EVAP pressure in step 1/5.
Result
|
DTC No.* |
Result |
Trouble Area |
Proceed to |
|---|---|---|---|
|
- |
Virtually no variation in EVAP pressure |
Not yet determined |
A |
|
P0451 |
EVAP pressure fluctuates by +/-0.3 kPa-g (+/-2.25 mmHg-g) or more |
Canister pressure sensor noise |
B |
*: These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedures above.
|
|
5. |
PERFORM EVAP SYSTEM CHECK (STEP 1/5 TO 2/5) |
(a) Check the EVAP pressure in steps 1/5 and 2/5.
Result
|
DTC No.* |
Result |
Trouble Area |
Proceed to |
|---|---|---|---|
|
- |
Virtually no variation in EVAP pressure during step 1/5. Then decreases to reference pressure |
Not yet determined |
A |
|
P2402 |
Small difference between EVAP pressures during steps 1/5 and 2/5 |
Leak detection pump stuck ON |
B |
*: These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedures above.
HINT:
The first reference pressure is the value determined in step 2/5.
|
|
6. |
PERFORM EVAP SYSTEM CHECK (STEP 2/5) |
HINT:
Make a note of the pressures checked in steps (a) and (b) below.
(a) Check the EVAP pressure 4 seconds after the leak detection pump is activated*.
*: The leak detection pump begins to operate as step 1/5 finishes and step 2/5 starts.
(b) Check the EVAP pressure again when it has stabilized. This pressure is the reference pressure.
Result
|
DTC No.* |
Result |
Trouble Area |
Proceed to |
|---|---|---|---|
|
- |
EVAP pressure in step (b) between -4.85 kPa-g and -1.057 kPa-g (-36.4 mmHg-g and -7.93 mmHg-g) |
Not yet determined |
A |
|
P043F and P2401 |
EVAP pressure in step (b) -1.057 kPa-g (-7.93 mmHg-g) or more |
|
B |
|
P043E |
EVAP pressure in step (b) below -4.85 kPa-g (-36.4 mmHg-g) |
Reference orifice clogged |
C |
|
P2419 |
EVAP pressure in step (a) more than -1.057 kPa-g (-7.93 mmHg-g) |
Vent valve stuck closed |
D |
*: These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedures above.
|
|
7. |
PERFORM EVAP SYSTEM CHECK (STEP 2/5 TO 3/5) |
(a) Check the EVAP pressure increase in step 3/5.
Result
|
DTC No.* |
Result |
Trouble Area |
Proceed to |
|---|---|---|---|
|
- |
EVAP pressure increases by 0.3 kPa-g (2.25 mmHg-g) or more within 10 seconds of proceeding from step 2/5 to step 3/5 |
Not yet determined |
A |
|
P2420 |
No variation in EVAP pressure despite proceeding from step 2/5 to step 3/5 |
Vent valve stuck open (vent) |
B |
|
P0451 |
No variation in EVAP pressure during steps 1/5 through 3/5 |
Canister pressure sensor output value stuck |
C |
*: These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedures above.
|
|
8. |
PERFORM EVAP SYSTEM CHECK (STEP 3/5) |
(a) Wait until the EVAP pressure change is less than 0.1 kPa-g (0.75 mmHg-g) for 30 seconds.
(b) Measure the EVAP pressure and record it.
HINT:
A few minutes are required for the EVAP pressure to become saturated. When there is little fuel in the fuel tank, it takes up to 15 minutes.
|
|
9. |
PERFORM EVAP SYSTEM CHECK (STEP 4/5) |
(a) Check the EVAP pressure in step 4/5.
Result
|
DTC No.* |
Result |
Trouble Area |
Proceed to |
|---|---|---|---|
|
- |
EVAP pressure increases by 0.3 kPa-g (2.25 mmHg-g) or more within 10 seconds of proceeding from step 3/5 to step 4/5 |
Not yet determined |
A |
|
P0441 |
EVAP pressure increases by 0.3 kPa-g (2.25 mmHg-g) or more within 10 seconds of proceeding from step 3/5 to step 4/5 |
Problems in purge line between purge VSV and intake manifold |
B |
|
P0441 |
Variation in EVAP pressure less than 0.3 kPa-g (2.25 mmHg-g) for 10 seconds, after proceeding from step 3/5 to step 4/5 |
Purge VSV stuck closed |
C |
*: These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedures above.
|
|
10. |
PERFORM EVAP SYSTEM CHECK (STEP 5/5) |
(a) Check the EVAP pressure in step 5/5.
(b) Compare the EVAP pressure in step 3/5 and the second reference pressure (step 5/5).
Result
|
DTC No.* |
Result |
Trouble Area |
Proceed to |
|---|---|---|---|
|
- |
EVAP pressure (step 3/5) lower than second reference pressure (step 5/5) |
Not yet determined (no leak from EVAP system) |
A |
|
P0441 and P0455 |
EVAP pressure (step 3/5) higher than [second reference pressure (step 5/5) x 0.2] |
|
B |
|
P0456 |
EVAP pressure (step 3/5) higher than second reference pressure (step 5/5) |
EVAP small leak |
B |
*: These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedures above.
|
11. |
PERFORM EVAP SYSTEM CHECK (STEP 3/5) |
(a) Check the EVAP pressure in step 3/5.
Result
|
DTC No.* |
Result |
Trouble Area |
Proceed to |
|---|---|---|---|
|
P043F |
EVAP pressure less than [reference pressure] measured at 2/5 |
Reference orifice high-flow |
A |
|
P2401 |
EVAP pressure almost same as [reference pressure] measured at 2/5 |
Leak detection pump stuck OFF |
B |
*: These DTCs are already present in the ECM when the vehicle arrives and are confirmed in the "Confirm DTC" procedures above.
HINT:
The first reference pressure is the value determined in step 2/5.
|
12. |
PERFORM ACTIVE TEST USING TECHSTREAM (PURGE VSV) |
(a) Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VSV for EVAP Control.
(b) Disconnect the hose (connected to the canister) from the purge VSV.
(c) Start the engine.
(d) Using the Techstream, turn off the purge VSV (Activate the VSV for EVAP Control: OFF).
(e) Use your finger to confirm that the purge VSV has no suction.
(f) Using the Techstream, turn on the purge VSV (Activate the VSV for EVAP Control: ON).
(g) Use your finger to confirm that the purge VSV has suction.
Result
|
Result |
Trouble Area |
Proceed to |
|---|---|---|
|
No suction when purge VSV turned OFF, and suction applied when turned ON |
Purge VSV normal |
A |
|
Suction applied when purge VSV turned OFF |
Purge VSV stuck open |
B |
|
No suction when purge VSV turned ON |
|
C |
|
|
13. |
CHECK FUEL TANK CAP ASSEMBLY |
(a) Check that the fuel tank cap is correctly installed and confirm the fuel tank cap meets OEM specifications.
(b) Tighten the fuel tank cap until a few click sounds are heard.
HINT:
If an EVAP tester is available, check the fuel tank cap using the Techstream.
- Remove the fuel tank cap and install it onto a fuel tank cap adapter.
- Connect an EVAP tester pump hose to the adapter, and pressurize the cap to 3.2 to 3.7 kPa (24 to 28 mmHg) using an EVAP tester pump.
- Seal the adapter and wait for 2 minutes.
- Check the pressure. If the pressure is 2 kPa (15 mmHg) or more, the fuel tank cap is normal.
Result
|
Result |
Trouble Area |
Proceed to |
|---|---|---|
|
Fuel tank cap correctly installed |
- |
A |
|
Fuel tank cap loose |
|
B |
|
Defective fuel tank cap |
- |
B |
|
No fuel tank cap |
- |
C |
|
14. |
INSPECT PURGE VSV |
(a) Turn the ignition switch off.
(b) Disconnect the purge VSV connector.
(c) Disconnect the hose (connected to the canister) from the purge VSV.
(d) Start the engine.
(e) Use your finger to confirm that the purge VSV has no suction.
Result
|
Result |
Trouble Area |
Proceed to |
|---|---|---|
|
No suction |
ECM |
A |
|
Suction applied |
Purge VSV |
B |
|
15. |
CHECK PURGE LINE (PURGE VSV - INTAKE MANIFOLD) |
(a) Disconnect the hose (connected to the intake manifold) from the purge VSV.
(b) Start the engine.
(c) Use your finger to confirm that the hose has suction.
Result
|
Result |
Trouble Area |
Proceed to |
|---|---|---|
|
Suction applied |
Purge line between purge VSV and intake manifold normal |
A |
|
No suction |
|
B |
|
|
16. |
INSPECT PURGE VSV |
(a) Remove the purge VSV
.
(b) Apply the battery voltage to the terminals of the purge VSV.
(c) Using an air gun, confirm that air flows from port A to port B.
Result
|
Result |
Trouble Area |
Proceed to |
|---|---|---|
|
Air flows |
- |
A |
|
No air flow |
Purge VSV |
B |
|
|
17. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE OF PURGE VSV) |
(a) Disconnect the purge VSV connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Result
|
Tester Connection |
Switch Condition |
Specified Condition |
Trouble Area |
Proceed to |
|---|---|---|---|---|
|
D16-1 - Body ground |
Ignition switch ON |
11 to 14 V |
Normal |
A |
|
Ignition switch ON |
Other than condition above |
Wire harness or connectors between purge VSV and battery |
B |
|
|
18. |
CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM) |
(a) Disconnect the ECM connector.
(b) Disconnect the purge VSV connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D56-63 (PRG) - D16-2 |
Always |
Below 1 Ω |
|
D56-63 (PRG) - Body ground |
Always |
10 kΩ or higher |
|
D16-1 - Body ground |
Always |
10 kΩ or higher |
|
19. |
INSPECT CANISTER PUMP MODULE (POWER SOURCE FOR VENT VALVE) |
(a) Turn the ignition switch off.
(b) Disconnect the canister pump module connector.
(c) Turn the ignition switch to ON.
(d) Measure the voltage according to the value(s) in the table below.
Result
|
Tester Connection |
Switch Condition |
Specified Condition |
Trouble Area |
Proceed to |
|---|---|---|---|---|
|
O24-9 (VLVB) - Body ground |
Ignition switch ON |
11 to 14 V |
|
A |
|
Ignition switch ON |
Below 3 V |
Power source wire harness of vent valve |
B |
|
|
20. |
INSPECT CANISTER PUMP MODULE (VENT VALVE OPERATION) |
(a) Turn the ignition switch off.
(b) Disconnect the canister pump module connector.
(c) Apply the battery voltage to 9 (VLVB) and 8 (VGND) terminals of the canister pump module.
(d) Touch the canister pump module to confirm the vent valve operation.
Result
|
Result |
Trouble Area |
Proceed to |
|---|---|---|
|
Operating |
1. Wire harness between vent valve and ECM 2. ECM |
A |
|
Not operating |
Vent valve |
B |
|
|
21. |
CHECK HARNESS AND CONNECTOR (ECM - CANISTER PUMP MODULE) |
(a) Disconnect the ECM connector.
(b) Disconnect the canister pump module connector.
(c) Measure the resistance according to the value(s) in the table below.
Result
|
Tester Connection |
Condition |
Specified Condition |
Trouble Area |
Proceed to |
|---|---|---|---|---|
|
A27-30 (VPMP) - O24-8 (VGND) |
Always |
Below 1 Ω |
ECM |
A |
|
Always |
10 kΩ or higher |
Wire harness between ECM and canister pump module |
B |
|
22. |
PERFORM ACTIVE TEST USING TECHSTREAM (VACUUM PUMP (ALONE)) |
(a) Turn the ignition switch off.
(b) Disconnect the canister pump module connector.
(c) Turn the ignition switch to ON.
(d) Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the Vacuum Pump.
(e) Measure the voltage according to the value(s) in the table below.
Result
|
Tester Connection |
Condition |
Specified Condition |
Trouble Area |
Proceed to |
|---|---|---|---|---|
|
O24-1 (MTRB) - Body ground |
Leak detection pump is turned ON and OFF using the Techstream |
Below 3 V when OFF 9 to 14 V when ON |
|
A |
|
Leak detection pump is turned ON and OFF using the Techstream |
Below 3 V when OFF and ON |
|
B |
|
|
23. |
CHECK HARNESS AND CONNECTOR (CANISTER PUMP MODULE - BODY GROUND) |
(a) Turn the ignition switch off.
(b) Disconnect the canister pump module connector.
(c) Measure the resistance according to the value(s) in the table below.
Result
|
Tester Connection |
Condition |
Specified Condition |
Trouble Area |
Proceed to |
|---|---|---|---|---|
|
O24-6 (MGND) - Body ground |
Always |
Below 1 Ω |
Leak detection pump |
A |
|
Always |
10 kΩ or higher |
Wire harness between canister pump module and body ground |
B |
|
24. |
CHECK HARNESS AND CONNECTOR (ECM - CANISTER PUMP MODULE) |
(a) Turn the ignition switch off.
(b) Disconnect the canister pump module connector.
(c) Disconnect the ECM connector.
(d) Measure the resistance according to the value(s) in the table below.
Result
|
Tester Connection |
Condition |
Specified Condition |
Trouble Area |
Proceed to |
|---|---|---|---|---|
|
A27-49 (MPMP) - O24-1 (MTRB) |
Always |
Below 1 Ω |
ECM |
A |
|
Always |
10 kΩ or higher |
Wire harness between ECM and canister pump module |
B |
|
25. |
INSPECT INTAKE MANIFOLD (EVAP PURGE PORT) |
(a) Stop the engine.
(b) Disconnect the purge line from the intake manifold.
(c) Start the engine.
(d) Use your finger to confirm that the port of the intake manifold has suction.
Result
|
Result |
Trouble Area |
Proceed to |
|---|---|---|
|
Suction applied |
Purge line between intake manifold and purge VSV |
A |
|
No suction |
Intake manifold |
B |
(e) Reconnect the purge line.
|
26. |
CORRECTLY REINSTALL OR REPLACE FUEL TANK CAP |
HINT:
- When reinstalling the fuel tank cap, tighten it until a few click sounds are heard.
- When replacing the fuel tank cap, use a fuel tank cap that meets OEM specifications, and install it until a few click sounds are heard.
|
27. |
REPLACE FUEL TANK CAP |
HINT:
When replacing the fuel cap, use a fuel cap that meets OEM specifications, and install it until a few click sounds are heard.
|
28. |
LOCATE EVAP LEAK PART |
(a) Disconnect the vent hose.
(b) Connect an EVAP tester to the canister pump module with the adapter.
(c) Pressurize the EVAP system to 3.2 to 3.7 kPa (24 to 28 mmHg).
(d) Apply soapy water to the piping and connecting parts of the EVAP system.
(e) Look for areas where bubbles appear. This indicates the leak point.
(f) Repair or replace the leak point.
HINT:
Disconnect the hose between the canister and the fuel tank from the canister. Block the canister side and conduct an inspection. In this way, the fuel tank can be excluded as an area suspected of causing fuel leaks.
|
29. |
REPLACE CANISTER ASSEMBLY |
(a) Replace the canister assembly
.
NOTICE:
When replacing the canister, check the canister pump module interior and related pipes for water, fuel and other liquids. If liquids are present, check for disconnections and/or cracks in the following: 1) the pipe from the air inlet port to the canister pump module; 2) the canister filter; and 3) the fuel tank vent hose.
|
30. |
REPLACE PURGE VSV |
(a) Replace the purge VSV
.
|
31. |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
32. |
REPLACE PURGE LINE (INTAKE MANIFOLD - PURGE VSV) |
|
33. |
INSPECT INTAKE MANIFOLD (EVAP PURGE PORT) |
(a) Check that the EVAP purge port of the intake manifold is not clogged. If necessary, replace the intake manifold.
|
34. |
REPLACE ECM |
(a) Replace the ECM
.
|
35. |
REPAIR OR REPLACE PARTS AND COMPONENTS INDICATED BY OUTPUT DTCS |
(a) Repair the malfunctioning areas indicated by the DTCs that had been confirmed when the vehicle was brought in.
|
|
36. |
PERFORM EVAP SYSTEM CHECK (AUTO OPERATION) |
NOTICE:
- The Evaporative System Check (Automatic Mode) consists of 5 steps performed automatically by the Techstream. It takes a maximum of approximately 18 minutes.
- Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed. If the cut-off valve is closed, the fuel tank leak check is not possible.
- Do not run the engine in this step.
- When the temperature of the fuel is 35°C (95°F) or more, a large amount of vapor forms and any check results become inaccurate. When performing an Evaporative System Check, keep the temperature below 35°C (95°F).
(a) Clear DTCs
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(b) Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.
(c) After the Evaporative System Check is completed, check for pending DTCs by entering the following menus: Powertrain / Engine and ECT / Trouble Codes / Pending.
HINT:
If no pending DTCs are found, the repair has been successfully completed.
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CONFIRMATION DRIVING PATTERN
HINT:
After a repair, check Monitor Status by performing the Key-Off Monitor Confirmation and Purge Flow Monitor Confirmation described below.
1. KEY-OFF MONITOR CONFIRMATION
(a) Preconditions
The monitor will not run unless:
- The vehicle has been driven for 10 minutes or more (in a city area or on a freeway)
- The fuel tank is less than 90% full
- The altitude is less than 2438 m (8000 ft.)
- The Engine Coolant Temperature (ECT) is between 4.4°C and 35°C (40°F and 95°F)
- The Intake Air Temperature (IAT) is between 4.4°C and 35°C (40°F and 95°F)
- The vehicle remains stationary (the vehicle speed is 0 km/h [0 mph])
(b) Monitor Conditions
- Allow the engine to idle for at least 5 minutes.
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Turn the ignition switch off and wait for 6 hours (8 or 10.5 hours).
HINT:
Do not start the engine until checking Monitor Status. If the engine is started, the steps described above must be repeated.
(c) Monitor Status
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON and turn the Techstream on.
- Enter the following menus: Powertrain / Engine and ECT / Monitor / Evaporative System.
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Check the Monitor Status displayed on the Techstream.
HINT:
If Incomplete is displayed, the monitor is not complete. Make sure that the preconditions have been met, and perform the Monitor Conditions again.
2. PURGE FLOW MONITOR CONFIRMATION (P0441)
HINT:
Perform this monitor confirmation after the Key-Off Monitor Confirmation shows Complete.
(a) Preconditions
The monitor will not run unless:
- The vehicle has been driven for 10 minutes or more (in a city area or on a freeway)
- The ECT is between 4.4 and 35°C (40 and 95°F)
- The IAT is between 4.4 and 35°C (40 and 95°F)
(b) Monitor Conditions
- Release the pressure from the fuel tank by removing and reinstalling the fuel cap.
- Warm the engine up until the ECT reaches more than 75°C (167°F).
- Increase the engine speed to 3000 rpm once.
- Allow the engine to idle and turn A/C ON for 1 minute.
(c) Monitor Status
- Turn the ignition switch off (if ON or the engine is running).
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON and turn the Techstream on.
- Enter the following menus: Powertrain / Engine and ECT / Monitor.
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Check the Monitor Status displayed on the Techstream.
HINT:
If Incomplete is displayed, the monitor is not complete. Make sure that the preconditions have been met, and perform the Monitor Conditions again.
MONITOR RESULT
Refer to Checking Monitor Status
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