P0456

DTC P0456: Evaporative Emission Control System Leak Detected (Very Small Leak)

System / Wiring Diagram










System / Circuit Description

While engine running, ECM closes EVAP canister vent valve and opens EVAP canister purge valve. If EVAP control system is in good condition, EVAP control system pressure that detected by fuel pressure and temp. sensor becomes down. After that, ECM closes EVAP canister purge valve leaving EVAP canister vent valve is closed. If EVAP emission control system is in good condition, the fuel tank pressure rises specified rate.

DTC Detecting Condition and Trouble Area






Troubleshooting

WARNING:

This work must be performed in a well ventilated area and away from any open flames such as gas hot water.

1.
Was "Engine System Check" performed?
YES
Go to Step 2. 
NO
Go to Engine System Check Engine System Check.

2. Check fuel filler cap for SUZUKI genuine parts, tightness and gasket for deterioration.

Are they in good condition?
YES
Go to Step 3.
NO
Tighten or replace fuel filler cap.

3. Perform the pressurization test referring to Evaporative Emission System Leak Inspection Evaporative Emission System Leak Inspection.

Is any leak detected?
YES
Go to Step 4.
NO
Fuel filler cap had loosened. Retighten fuel filler cap securely. If any leak is detected after retightening fuel filler cap, substitute a known-good ECM and recheck.

4. Perform smoke test referring to Evaporative Emission System Smoke Test Evaporative Emission System Smoke Test.

Is there any leaky part?
YES
Repair or replace the leaky parts. After repairing or replacing leaky parts, perform Step 3 once again.
NO
Go to Step 5.

5. Check EVAP canister purge valve and its circuit referring to EVAP Canister Purge Valve and Its Circuit Inspection EVAP Canister Purge Valve and Its Circuit Inspection.

Is check result satisfactory?
YES
Go to Step 6.
NO
Replace EVAP canister purge valve.

6. Check EVAP canister vent valve and its circuit referring to EVAP Canister Vent Valve and its Circuit Inspection EVAP Canister Vent Valve and Its Circuit Inspection.

Is check result satisfactory?
YES
Go to Stop 7.
NO
Replace EVAP canister vent valve.

7. Check fuel tank pressure and temp. sensor for performance referring to Fuel Tank Pressure and Temp. Sensor Inspection Fuel Tank Pressure and Temp. Sensor Inspection.

Is it in good condition?
YES
Go to Step 8.
NO
Replace fuel tank pressure and temp. sensor.

8. Check fuel level sensor and its circuit referring to P0461 DTC P0461: Fuel Level Sensor (Gauge) Circuit Performance Problem.

Is check result satisfactory?
YES
Substitute a known-good ECM and recheck.
NO
Repair or replace malfunction part.