P1423

3MZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1422: Fuel Tank Small Leak

DTC P1422 - Fuel Tank Small Leak

DTC P1423 - Fuel Tank Gross Leak

DTC SUMMARY

DESCRIPTION

Refer to the EVAP system EVAP System.

MONITOR DESCRIPTION

1 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 HV control ECU) determines that the fuel tank has a large leakage. The ECM illuminates the MIL and sets the DTC (2 trip detection logic).
2 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 HV 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

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. EVAP 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 fuel tank pressure change is less than 0.1 kPa (0.75 mmHg) in 30 seconds.

P1423: Fuel tank gross leak:

P1422: Fuel tank small leak:

MONITOR RESULT

Refer to the EVAP system EVAP System.

INSPECTION PROCEDURE

Refer to the EVAP system EVAP System.