P1423

2AZ-FXE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1422,P1423: Fuel Tank Small Leak
P1423 - Fuel Tank Gross Leak

DTC SUMMARY





DESCRIPTION

Refer to the EVAP System Component Tests and General Diagnostics.

MONITOR DESCRIPTION

* P1422: Fuel tank very small leak

* In operation G, the vacuum pump creates negative pressure (vacuum) in the fuel tank and the fuel tank pressure is measured. If the stabilized system pressure is higher than the third 0.02 inch leak pressure standard, the ECM (included in the hybrid vehicle control ECU) determines that the fuel tank has a large leakage. The ECM illuminates the MIL and sets the DTC (2-trip detection logic).

* P1423: Fuel tank gross leak

* In operation G, the vacuum pump creates negative pressure (vacuum) in the fuel tank and the fuel tank pressure is measured. If the stabilized system pressure is higher than [third 0.02 inch leak pressure standard x 0.2] (near atmospheric pressure), the ECM (included in the hybrid vehicle control ECU) determines that the fuel tank has a large leakage. The ECM illuminates the MIL and sets the DTC (2-trip detection logic).





MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





Example of restart time:

Example of restart time::

Key-off monitor sequence 1 to 15

1. Atmospheric pressure measurement

1. Atmospheric pressure measurement:

2. First reference pressure measurement

2. First reference pressure measurement:

3. Vent valve stuck closed check

3. Vent valve stuck closed check:

4. Vacuum introduction for canister

4. Vacuum introduction for canister:

5. Purge VSV stuck closed check

5. Purge VSV stuck closed check:

6. Second reference pressure measurement

6. Second reference pressure measurement:

7. Canister leak

7. Canister leak:

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

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

9. Vacuum introduction for fuel tank

9. Vacuum introduction for fuel tank:

10. FVCV stuck closed check

10. FVCV stuck closed check:

11. FTP sensor stuck check

11. FTP sensor stuck check:

12. Third reference pressure measurement

12. Third reference pressure measurement:

13. Fuel tank leak check

13. Fuel tank leak check:

14. FTP sensor stuck check

14. FTP sensor stuck check:

15. Atmospheric pressure measurement

15. Atmospheric pressure measurement:

TYPICAL MALFUNCTION THRESHOLDS

"Saturated" indicateds that the fuel tank pressure change is less than 0.1 kPa (0.75 mmHg) in 30 seconds.

P1423: Fuel tank gross leak

P1423: Fuel tank gross leak:

P1422: Fuel tank small leak

P1422: Fuel tank small leak:

MONITOR RESULT

Refer to EVAP System Component Tests and General Diagnostics.

INSPECTION PROCEDURE

Refer to EVAP System Component Tests and General Diagnostics.