Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.

DTC P0456 [BP, BP WITH TC] DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record FREEZE FRAME DATA on 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 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 key to 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 the 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 (red light turns on)?	Yes	Go to the 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 Ultrasonic leak detector. 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 the 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 the next step.
6		No	Replace purge solenoid valve, then go to Step 10.
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 (red light turns on)?	Yes	Go to Step 9.
7		No	Go to the 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 (red light turns on)?	Yes	Replace EVAP system leak detection pump, then go to Step 10.
8		No	Go to the next step.
9	INSPECT FUEL PUMP UNIT INSTALLATION Remove fuel tank. Visually inspect for damage, insufficient sealing or poorly installed pump unit. Is it normal?	Yes	Go to the next step.
9		No	Repair or replace fuel tank or sealing, then go to the next step.
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 (red light turns on)?	Yes	Leakage still exists. Locate 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.