P0456-EVAP SYSTEM SMALL LEAK
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
With the ignition off, fuel level less than 88%, ambient temperature between 4° C and 43° C (39° F and 109° F).
- Set Condition:
As temperatures change, a vacuum is created in the fuel tank and EVAP system. With the EVAP system sealed, the PCM monitors the ESM switch. If the ESM switch does not close within a calibrated time, an error is detected by the PCM. One Trip Fault. Three good trips to turn off the MIL.
| Possible Causes |
| INTERMITTENT DTC |
| EVAP PURGE SOLENOID VACUUM SUPPLY |
| EVAP PURGE HOSE/TUBE OBSTRUCTION |
| EVAP SYSTEM LEAK |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
1.EVAP SYSTEM INSPECTION
Were any problems found?
Yes
- Repair as necessary.
- Perform the PCM Verification Test. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Go to 2
2.EVAP PURGE SOLENOID
NOTE: The solenoid should hold vacuum for a minimum of 15 seconds.
NOTE: The vacuum should drop when the solenoid is actuated.
Does the solenoid function as described above?
Yes
- Go to 3
No
- Replace the Evap Purge Solenoid.
- Perform the PCM Verification Test. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
3.EVAP PURGE HOSE/TUBE OBSTRUCTION
Were any problems found?
Yes
- Repair or replace as necessary.
- Perform the PCM Verification Test. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Go to 4
4.CHECKING THE EVAPORATIVE SYSTEM FOR LEAKS
Were any problems found?
Yes
- Repair as necessary in accordance with the Service Information.
- Perform the PCM Verification Test. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)