Diagnostic Procedure

DTC P0456 DIAGNOSTIC PROCEDURE TABLE

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED Have FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (Evaporative system related) been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins and/or on-line repair information availability. Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. If the vehicle is not' repaired, go to the next step.
2		No	Go to the next step.
3	VERIFY RELATED PENDING CODE OR STORED DTCS Turn ignition switch OFF then ON (Engine OFF). Verify related PENDING CODE or stored DTCs. Is other DTC present?	Yes	Go to appropriate DTC inspection.
3		No	Go to next step.
4	CLASSIFY INTERMITTENT CONCERN OR CONTINUOUS CONCERN Perform evaporative system leak inspection. (See EVAPORATIVE EMISSION (EVAP) SYSTEM LEAK INSPECTION .) Is system test result failed?	Yes	Go to next step.
4		No	Intermittent concern exists. Inspect purge solenoid valve and EVAP system leak detection pump circuit for intermittent concern. (See INTERMITTENT CONCERN TROUBLESHOOTING .)
5	LOCATE LEAK POINT Check leakage for the following using. Evaporative emission Tester Charcoal canister Catch tank Fuel filler cap EVAP hoses and pipes Fuel tank Is leakage found?	Yes	Repair leakage or replace part, then go to Step 10.
5		No	Go to next step.
6	INSPECT PURGE SOLENOID VALVE Inspect if purge solenoid valve is stuck closed. (See PURGE SOLENOID VALVE INSPECTION .) Is purge solenoid valve okay?	Yes	Go to next step.
6		No	Replace purge solenoid valve, then go to Step 10. (See PURGE SOLENOID VALVE REMOVAL/INSTALLATION .)
7	INSPECT EVAP SYSTEM LEAK DETECTION PUMP Connect all disconnected connectors and hoses. Place clamp on EVAP system leak detection pump hose between EVAP system leak detection pump and air filter. Perform evaporative system leak inspection. (See EVAPORATIVE EMISSION (EVAP) SYSTEM LEAK INSPECTION .) Is test result failed?	Yes	Go to Step 9.
7		No	Go to next step.
8	CONFIRM EVAP SYSTEM LEAK DETECTION PUMP LEAKAGE Remove clamp. Perform evaporative system leak inspection. (See EVAPORATIVE EMISSION (EVAP) SYSTEM LEAK INSPECTION .) Is test result failed?	Yes	Replace EVAP system leak detection pump, then go to Step 10. (See EVAPORATIVE EMISSION (EVAP) SYSTEM LEAK DETECTION PUMP REMOVAL/INSTALLATION .)
8		No	Go to next step.
9	INSPECT FUEL PUMP UNIT INSTALLATION Remove fuel tank. Visually inspect for damage, insufficient sealing or poorly installed pump unit. Is it okay?	Yes	Go to next step.
9		No	Repair or replace fuel tank or sealing, then go to next step. (See FUEL TANK REMOVAL/INSTALLATION .)
10	PERFORM LEAK INSPECTION Connect all disconnected connectors and hoses. Perform evaporative system leak inspection. (See EVAPORATIVE EMISSION (EVAP) SYSTEM LEAK INSPECTION .) Is test result failed?	Yes	Leakage still exists. Locate leak point and repair. Then go to next step.
10		No	Go to next step
11	VERIFY AFTER REPAIR PROCEDURE Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE .) Is there any DTC present?	Yes	Go to applicable DTC inspection. (See DTC TABLE .)
11		No	Troubleshooting completed.