Part 2

2AZ-FXE ENGINE CONTROL SYSTEM: SFI SYSTEM: P043E, P043F, P2401, P2402, P2419: Evaporative Emission System Reference Orifice Clog Up

Continued

25. CHECK HARNESS AND CONNECTOR (FUEL VAPOR-CONTAINMENT VALVE ASSEMBLY - ECM)

(a) Disconnect the A61 hybrid vehicle control ECU connector.
(b) Disconnect the k1 canister closed valve.
(c) Measure the resistance.

Standard resistance:

NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
26. REPLACE HYBRID VEHICLE CONTROL ECU
NEXT -- PERFORM SYSTEM CHECK (EVAP SYSTEM CHECK AGAIN (AUTOMATIC OPERATION))
27. REPLACE PURGE VSV
NEXT -- PERFORM SYSTEM CHECK (EVAP SYSTEM CHECK AGAIN (AUTOMATIC OPERATION))
28. REPLACE CANISTER ASSEMBLY
(a) Replace the canister assembly Components.

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 (EVAP SYSTEM CHECK AGAIN (AUTOMATIC OPERATION))
29. REPLACE FUEL VAPOR-CONTAINMENT VALVE
NEXT -- PERFORM SYSTEM CHECK (EVAP SYSTEM CHECK AGAIN (AUTOMATIC OPERATION))
30. REPLACE FUEL TANK CAP
NEXT -- PERFORM SYSTEM CHECK (EVAP SYSTEM CHECK AGAIN (AUTOMATIC OPERATION))
31. REPAIR OR REPLACE HARNESS AND CONNECTOR
NEXT -- PERFORM SYSTEM CHECK (EVAP SYSTEM CHECK AGAIN (AUTOMATIC OPERATION))
32. REPAIR OR REPLACE VACUUM HOSE
NEXT -- PERFORM SYSTEM CHECK (EVAP SYSTEM CHECK AGAIN (AUTOMATIC OPERATION))
33. PERFORM SYSTEM CHECK (EVAP 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: DIAGNOSIS / ENHANCED OBD II / SYSTEM CHECK / EVAP SYS CHECK / MANUAL OPERATION.

NOTICE:
- In EVAP SYSTEM CHECK (AUTO OPERATION), the series of 9 EVAP SYSTEM CHECK steps is performed automatically. It takes a maximum of approximately 18 minutes.
- Do not perform EVAP 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 EVAP 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 (EVAP SYSTEM CHECK (MANUAL OPERATION STEP 1))
(a) Select step 1 and wait 10 seconds.
NEXT -- Continue to next step.
35. PERFORM SYSTEM CHECK (EVAP 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.

- (c) Check the EVAP pressure again when it has stabilized. This pressure is the first reference pressure standard.

Result:

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

Result:

- (c) Check the fuel tank 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 (EVAP 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 (EVAP 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 (EVAP SYSTEM CHECK (MANUAL OPERATION STEP 6))
(a) Perform step 6 and wait 5 seconds.
NEXT -- Continue to next step.
40. PERFORM SYSTEM CHECK (EVAP 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 (EVAP 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 intelligent tester 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 intelligent tester.
(b) PURGE FLOW MONITOR DRIVE PATTERN (P0441)
(1) Connect the intelligent tester 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 intelligent tester.
NEXT -- PERFORM EVAP SYSTEM (EVAP SYSTEM CHECK AGAIN (AUTOMATIC OPERATION))

MONITOR DESCRIPTION

In sequence B and E, the leak detection pump creates negative pressure (vacuum) through the reference orifice. The EVAP system pressure is then measured by the ECM, using the canister pressure sensor, to determine the reference pressure. If the pressure is one of the following conditions, the ECM illuminates the MIL and sets the DTC (2-trip detection logic).

- Canister pressure is lower than the malfunction criterion (ex. 724 mmHg).
- Canister pressure is higher than the malfunction criterion (ex. 752 mmHg).
- Canister pressure is not saturated within 60 seconds.
- Canister pressure difference of sequence B and sequence E is large.