DTC P0455, P0456 (1.5 L Engine)
DTC P0455 : EVAP System Very Large Leak Detected DTC P0456 : EVAP System Very Small Leak Detected
Special Tools Required
Vacuum Pump/Gauge, 0-30 inHg Snap-on YA4000A or equivalent, commercially available
Vacuum/Pressure Gauge, 0-4 inHg 07JAZ-001000B
NOTE:
The fuel system is designed to allow specified maximum vacuum and pressure conditions. Do not deviate from the vacuum and pressure tests as indicated in these procedures. Excessive pressure/vacuum would damage the EVAP components or cause eventual fuel tank failure.
NOTE:
- Before you troubleshoot, review the general troubleshooting information .
- Fresh fuel has a higher volatility that will create greater pressure/vacuum. The best condition for testing is less than a full tank of fresh fuel. If possible, to assist in leak detection, add 1 gallon of fresh fuel to the tank (as long as it will not fill the tank), just before starting these procedures.
| DTC Description | Confirmed DTC | Pending DTC |
|---|---|---|
| P0455 EVAP System Very Large Leak Detected | ||
| P0456 EVAP System Very Small Leak Detected |
DTC (PGM-FI)
- Shut-off valve check
-1. Remove the mis-fuel inhibit device .
-2. Check the flap of the shut-off valve (A).
Is the flap closed?
YES
Go to step 2.
NO
- Shut-off valve seal check
-1. Check the flap seal of the shut-off valve (A) and the mating surface on the shut-off valve.
Is the flap seal missing or damaged, is the shut-off valve mating surface damaged?
YES
NO
Go to step 3.
- Problem verification
-1. Turn the vehicle to the ON mode.
-2. Clear the DTC with the HDS.
-3. Select the EVAP TEST in the Function Test, then select the FUNCTION TEST with the HDS.
EVAP TEST - FUNCTION TEST
Is the result OK?
YES
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the FTP sensor, the EVAP canister purge valve, the EVAP canister vent shut valve, and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot . If the vehicle returns with the same DTC, continue with step 4.
NO
The failure is duplicated. Go to step 4.
- EVAP canister vent hose check
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Remove the EVAP canister vent hose (A), and check it for a blockage or a restriction.
Is there a blockage or a restriction in the hose?
YES
Remove a blockage or a restriction, if needed, replace the EVAP canister vent hose.
NO
Reconnect the hose, then go to step 5.
- Fuel tank vapor recirculation tube visual check
-1. Check for a poor connection or damage at the fuel tank vapor recirculation tube.
Is the tube OK?
YES
Go to step 6.
NO
Replace the fuel tank or replace the fuel tank unit if needed.
- EVAP canister purge valve leak check
-1. Disconnect the vacuum hose (purge line) (A) from the EVAP canister purge valve (B) in the engine compartment, then connect a T-fitting (C), a vacuum gauge, and a vacuum pump/gauge, 0-30 inHg, to the vacuum hose as shown.
-2. Slowly apply about 2 kPa (0.6 inHg, 15 mmHg) of vacuum to the hose.
Does it hold vacuum for 1 minute?
YES
Leak not detected at the EVAP canister purge valve. Go to step 7.
NO
- Determine possible failure area (EVAP canister vent shut valve, others)
-1. Disconnect the fuel vent tube (A) from the EVAP canister (B), and plug the EVAP canister port (C).
-2. Connect the T-fitting, the vacuum gauge, and the vacuum pump/gauge to the hose (purge line) (A) as shown.
-3. Turn the vehicle to the ON mode.
-4. Select the EVAP TEST in the Function Test, then select the CVS ON in the SINGLE SOLENOID with the HDS.
EVAP TEST - SINGLE SOLENOID
-5. Apply vacuum to the hose until the FTP reads 1.90 V (-0.59 inHg, -15.1 mmHg).
NOTE: Be careful not to exceed the vacuum. If you do, the FTP sensor can be damaged.
Signal Current conditions Values Unit FTP Sensor Voltage FTP Sensor -6. Check the parameter (s) below with the HDS for 1 minute.
Signal Current conditions Values Unit FTP Sensor Voltage FTP Sensor Does the voltage increase more than 0.2 V (0.1 inHg, 2.5 mmHg)?
YES
Go to step 8.
NO
Go to step 10.
- EVAP canister vent shut valve operation check
-1. Select the EVAP TEST in the Function Test, then select the CVS OFF in the SINGLE SOLENOID with the HDS.
EVAP TEST - SINGLE SOLENOID
-2. Disconnect the EVAP canister vent hose (A) from the EVAP canister vent shut valve port (B), and plug it.
-3. Apply vacuum to the hose until the FTP reads 1.90 V (-0.59 inHg, -15.1 mmHg).
NOTE: Be careful not to exceed the vacuum. If you do, the FTP sensor can be damaged.
Signal Current conditions Values Unit FTP Sensor Voltage FTP Sensor -4. Check the parameter (s) below with the HDS for 1 minute.
Signal Current conditions Values Unit FTP Sensor Voltage FTP Sensor Does the voltage increase more than 0.2 V (0.1 inHg, 2.5 mmHg)?
YES
The EVAP canister vent shut valve is OK. Go to step 9.
NO
- EVAP canister purge line visual check
-1. Check for a poor connection or damaged EVAP canister purge line between the EVAP canister and the EVAP canister purge valve. Also check for damage to the EVAP canister.
Are the line and the EVAP canister OK?
-
YES
Replace these parts.
NO
Replace or repair the EVAP canister purge line or the canister.
-
- Fuel fill pipe and fuel tank vapor recirculation tube visual check
-1. Select the EVAP TEST in the Function Test, then select the CVS OFF in the SINGLE SOLENOID with the HDS.
EVAP TEST - SINGLE SOLENOID
Check for a poor connection or damage to the fuel fill pipe and the fuel tank vapor recirculation tube.
Are the parts and connections OK?
YES
Replace the fuel tank unit O-ring . If needed, replace the fuel tank unit .
NO