P0457
DTC P0457 EVAP. EMISSION SYSTEM-LEAK DETECTED(TANK CAP LOOSE/OFF)GENERAL DESCRIPTION
Due to the increasing ambient temperature of the fuel, fuel vapors are generated in the tank. In order to control the release of these vapors to the atmosphere, the evaporative emissions control system is used. The evaporative emission control system reduces hydrocarbon (HC) emissions by trapping fuel tank vapors until they can be burned in the combustion process. Evaporating fuel is stored in a charcoal canister until it can be flushed into the intake manifold. The evaporative emission control system is made up of a fuel tank that can be completely sealed from outside air, a Fuel Tank Pressure Sensor (FTPS), a Canister Close Valve (CCV) that seals the canister from the outside air, a canister filled with activated charcoal granules, a Purge Control Solenoid Valve (PCSV). The evaporative emission system can be checked for leaks by sealing the system off from the outside air, creating a vacuum, and monitoring if the system can hold that vacuum sufficiently for a set amount of time. If it cannot, a leak exists somewhere in the system.
DTC DESCRIPTION
If there is a large leak caused by a fuel cap loosened, ECM/PCM sets DTC P0457.
DTC Detecting Condition:
MONITOR SCANTOOL DATA
1. Connect scantool to DLC (Data Link Cable)
2. Warm-up the engine to normal operating temperature.
3. Erase DTC currently displayed.
4. Perform the "EVAP LEAKAGE TEST" with scantool.
5. Is the same DTC displayed after "EVAP LEAKAGE TEST" has done?
YES - Go to "System Inspection" procedure.
NO - Fault is intermittent caused by poor contact in the sensor's and/or ECM/PCM's connector or was repaired and ECM/PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, ending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure
SYSTEM INSPECTION
1. Check Fuel Cap
1. Check fuel cap is firmly tightened.
2. Check damage or leakage of fuel cap.
3. Has a problem been found?
YES - Repair or replace as necessary and then, Go to "Verification of Vehicle Repair" procedure.
NO - Substitute with a known - good ECM/PCM and check for proper operation. If the problem is corrected, replace ECM/PCM and go to "Verification of Vehicle Repair" procedure.
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Clear the DTCs and Operate the vehicle within DTC Enable conditions in General information.
3. Are any DTCs present?
YES - Go to the applicable troubleshooting procedure.
NO - System is performing to specification at this time.