Part 3

2AZ-FXE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2420: Evaporative Emission System Switching Valve Control Circuit High - Continued

DTC P2420 - Evaporative Emission System Switching Valve Control Circuit High

26. REPLACE HYBRID VEHICLE CONTROL ECU
(a) Replace the hybrid vehicle control ECU Removal.
NEXT -- PERFORM SYSTEM CHECK (EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC OPERATION))
27. REPLACE PURGE VSV
NEXT -- PERFORM SYSTEM CHECK (EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC OPERATION))
28. REPLACE CANISTER ASSEMBLY
(a) Replace the canister assembly Removal.
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 hose from the canister to the fuel tank.

NEXT -- PERFORM SYSTEM CHECK (EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC OPERATION))
29. REPLACE FUEL VAPOR-CONTAINMENT VALVE
NEXT -- PERFORM SYSTEM CHECK (EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC OPERATION))
30. REPLACE FUEL TANK CAP
NEXT -- PERFORM SYSTEM CHECK (EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC OPERATION))
31. REPAIR OR REPLACE HARNESS OR CONNECTOR
NEXT -- PERFORM SYSTEM CHECK (EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC OPERATION))
32. REPAIR OR REPLACE VACUUM HOSE
NEXT -- PERFORM SYSTEM CHECK (EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC OPERATION))
33. PERFORM SYSTEM CHECK (EVAPORATIVE SYSTEM CHECK (MANUAL OPERATION))
HINT: In the manual operation check, the EVAP system can be checked in signal steps. Valve operation and pressure in each step can also be checked.
(a) Clear the DTCs DTC Check / Clear.
(b) Remove the fuel tank cap and reinstall the fuel cap.
(c) Enter the following menus: Powertrain / Engine / Utility / Evaporative System Check / Manual Mode.
NOTICE:
- In Evaporative System Check (Manual Mode), the series of 9 Evaporative System Check steps is performed automatically. It takes a maximum of approximately 18 minutes.
- Do not perform Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed, making the leak check of the fuel tank unavailable.
- 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 Evaporative System Check, keep the temperature below 35°C (95°F).

Tester Display

Manual Operation Step

- Timing Chart

NEXT -- Continue to next step.
34. PERFORM SYSTEM CHECK (EVAPORATIVE SYSTEM CHECK (MANUAL OPERATION STEP 1))
(a) Select step 1 and wait 10 seconds.
NEXT -- Continue to next step.
35. PERFORM SYSTEM CHECK (EVAPORATIVE SYSTEM CHECK (MANUAL OPERATION STEP 2))
(a) Perform step 2.
(b) Check the EVAP pressure 2 seconds after the leak detection pump is activated*.
*: The leak detection pump begins to operate at the start of step 2.

Result:

C -- REPLACE CANISTER ASSEMBLY
B -- PERFORM ACTIVE TEST USING TECHSTREAM (VACUUM PUMP)
A -- Continue to next step.
36. PERFORM SYSTEM CHECK (EVAPORATIVE SYSTEM CHECK (MANUAL OPERATION STEP 3))
(a) Perform step 3.
(b) Check the EVAP pressure change in step 3.

Result:

(d) Check the EVAP pressure again when it has stabilized. This pressure is the canister leak pressure standard.
(e) Compare the first reference pressure with the canister leak pressure.

Result:

D -- LOCATE EVAP LEAK PART (PURGE VSV - CANISTER)
C -- CHECK FUEL VAPOR-CONTAINMENT VALVE ASSEMBLY (POWER SOURCE CIRCUIT)
B -- INSPECT CANISTER PUMP MODULE (VENT VALVE OPERATION)
A -- Continue to next step.
37. PERFORM SYSTEM CHECK (EVAPORATIVE SYSTEM CHECK (MANUAL OPERATION STEP 4))
(a) Perform step 4.
(b) Check the EVAP pressure change in step 4.

Result:

B -- CHECK VACUUM HOSE (PURGE VSV - INTAKE MANIFOLD)
A -- Continue to next step.
38. PERFORM SYSTEM CHECK (EVAPORATIVE SYSTEM CHECK (MANUAL OPERATION STEP 5))
(a) Perform step 5 and wait 60 seconds.
(b) Check the EVAP pressure. This pressure is the second reference pressure standard.
NEXT -- Continue to next step.
39. PERFORM SYSTEM CHECK (EVAPORATIVE SYSTEM CHECK (MANUAL OPERATION STEP 6))
(a) Perform step 6 and wait 5 seconds.
NEXT -- Continue to next step.
40. PERFORM SYSTEM CHECK (EVAPORATIVE SYSTEM CHECK (MANUAL OPERATION STEP 7))
(a) Perform step 7.
(b) Check that the tank pressure and EVAP pressure change.
(c) Check the tank pressure again when it has stabilized. This pressure is the fuel tank leak pressure standard.

Result:

B -- CHECK FUEL VAPOR-CONTAINMENT VALVE ASSEMBLY (POWER SOURCE CIRCUIT)
A -- Continue to next step.
41. PERFORM SYSTEM CHECK (EVAPORATIVE SYSTEM CHECK (MANUAL OPERATION STEP 8))
(a) Perform step 8 and wait 60 seconds.
(b) Check the EVAP pressure. This pressure is the third reference pressure standard.
(c) Compare the tank pressure checked in step 8 with the third reference pressure.

Result:

B -- CHECK FUEL TANK CAP ASSEMBLY
A -- Continue to next step.
42. PERFORM CONFIRMATION DRIVING PATTERN
(a) KEY-OFF MONITOR DRIVE PATTERN
(1) Connect the Techstream to the DLC3.
(2) Confirm the following conditions are satisfied:

- The fuel level is less than 90%.
- The altitude is less than 8,000 ft. (2,400 m).
- The vehicle is stopped (the vehicle speed is less than 2 mph).
- The ECT is 4.4 to 35°C (40 to 95°F.)
- The IAT is 4.4 to 35°C (40 to 95°F).
- Drive the vehicle in a city area or on free-way for 10 minutes or more.

(3) Perform the drive pattern:
1. Allow the engine to idle for 5 minutes or more.
2. Turn the power switch off and wait 6 hours.

(4) Check the monitor status with the Techstream.
(b) PURGE FLOW MONITOR DRIVE PATTERN (P0441)
(1) Connect the Techstream to the DLC3.
(2) Confirm that the following conditions are satisfied:

- The Engine Coolant Temperature (ECT) is more than 4.4°C (40°F).
- The Intake Air Temperature (IAT) is more than 4.4°C (40°F).

(3) Perform the drive pattern:
1. Remove and reinstall the fuel cap to release the fuel tank pressure.
2. Warm up the engine until the ECT reaches 75°C (167°F) or more.
3. Drive vehicle in a city area or on free-way for 10 minutes or more.

(4) Check the monitor status with the Techstream.
NEXT -- PERFORM EVAP SYSTEM (EVAPORATIVE SYSTEM CHECK AGAIN (AUTOMATIC OPERATION))

MONITOR DESCRIPTION

Vent valve stuck open (vent)

In operation C, the vent valve turns ON (closes) and the EVAP system pressure is then measured by the ECM (included in the hybrid vehicle control ECU),using the canister pressure sensor, to conduct an EVAP leak check. If the pressure does not increase when the vent valve is opened, the ECM interprets this as the vent valve being stuck open. The ECM illuminates the MIL and sets the DTC.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

Example of restart time

Key-off monitor sequence 1 to 15

1. Atmospheric pressure measurement

2. First reference pressure measurement

3. Vent valve stuck closed check

4. Vacuum introduction for canister

5. Purge VSV stuck closed check

6. Second reference pressure measurement

7. Canister leak

8. Fuel vapor-containment valve (FVCV stuck closed check)

9. Vacuum introduction for fuel tank

10. FVCV stuck closed check

11. FTP sensor stuck check

12. Third reference pressure measurement

13. Fuel tank leak check

14. FTP sensor stuck check

15. Atmospheric pressure measurement

TYPICAL MALFUNCTION THRESHOLDS

"Saturated" indicates that the EVAP pressure change is less than 0.286 kPa (2.14 mmHg) in 60 seconds.

Vent valve stuck open (vent)

MONITOR RESULT

Refer to CHECKING MONITOR STATUS [ SFI SYSTEM: CHECKING MONITOR STATUS ].