Diagnostic procedure

DTC P0456 DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED Have the FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (Evaporative emission system related) been recorded?	Yes	Go to the next step.
1		No	Record FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Check for related Service Bulletins and/or online repair information availability. Is any related repair information available?	Yes	Perform the 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 the ignition switch off then ON position (Engine off). Verify related PENDING CODE or stored DTCs. Are other DTC present?	Yes	Go to the appropriate DTC inspection.
3		No	Go to the next step.
4	CLASSIFY INTERMITTENT CONCERN OR CONTINUOUS CONCERN Perform the evaporative system leak inspection. (See EVAPORATIVE EMISSION (EVAP) SYSTEM LEAK INSPECTION ). Does the system test result fail?	Yes	Go to the next step.
4		No	Intermittent concern exists. Inspect the purge solenoid valve and the EVAP system leak detection pump circuit for an intermittent concern. (See INTERMITTENT CONCERN TROUBLESHOOTING ).
5	LOCATE LEAK POINT Check for leakage for the following using the Evaporative Emission Tester Charcoal canister Catch tank Fuel filler cap EVAP hoses and pipes Fuel tank Is leakage found?	Yes	Repair the leakage or replace the part, then go to Step 10.
5		No	Go to the next step.
6	INSPECT PURGE SOLENOID VALVE Inspect if the purge solenoid valve is stuck closed. (See PURGE SOLENOID VALVE INSPECTION ). Is the purge solenoid valve normal?	Yes	Go to the next step.
6		No	Replace the purge solenoid valve, then go to Step 10.
7	INSPECT EVAP SYSTEM LEAK DETECTION PUMP Connect all disconnected connectors and hoses. Place a clamp on the EVAP system leak detection pump hose between the EVAP system leak detection pump and the air filter. Perform the evaporative system leak inspection. (See EVAPORATIVE EMISSION (EVAP) SYSTEM LEAK INSPECTION ). Does the test result fail?	Yes	Go to Step 9.
7		No	Go to the next step.
8	CONFIRM EVAP SYSTEM LEAK DETECTION PUMP LEAKAGE Remove the clamp. Perform the evaporative system leak inspection. (See EVAPORATIVE EMISSION (EVAP) SYSTEM LEAK INSPECTION ). Does the test result fail?	Yes	Replace the EVAP system leak detection pump, then go to Step 10.
8		No	Go to the next step.
9	INSPECT FUEL PUMP UNIT INSTALLATION Remove the fuel tank. Visually inspect for damage, insufficient sealing or a poorly installed pump unit. Is it normal?	Yes	Go to the next step.
9		No	Repair or replace the fuel tank or sealing, then go to the next step.
10	PERFORM LEAK INSPECTION Connect all disconnected connectors and hoses. Perform the evaporative system leak inspection. (See EVAPORATIVE EMISSION (EVAP) SYSTEM LEAK INSPECTION ). Does the test result fail?	Yes	Leakage still exists. Locate the leak point and repair. Then go to the next step.
10		No	Go to next step.
11	VERIFY AFTER REPAIR PROCEDURE Perform the "After Repair Procedure". (See AFTER REPAIR PROCEDURE ). Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE ).
11		No	Troubleshooting completed.