SFI SYSTEM, Diagnostic DTC:P0455, P0456, P1451, P2404

DTC Code DTC Name
P0455 Evaporative Emission Control System Leak Detected (Gross Leak)
P0456 Evaporative Emission Control System Leak Detected (Very Small Leak)
P1451 Fuel Tank Pressure Sensor Range/Performance
P2404 Evaporative Emission System Leak Detection Pump Sense Circuit Range / Performance

DTC SUMMARY

DTC No. Monitoring Item Malfunction Detection Condition Trouble Area Detection Timing Detection Logic
P0455 EVAP gross leak

Leak detection pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure is measured. Reference pressure is measured at start and end of leak check.

If stabilized pressure is higher than [second reference pressure x 0.377], ECM determines that EVAP system has a large leak.

  • Fuel cap (loose)

  • Leakage from EVAP line (canister - fuel tank)

  • Leakage from EVAP line (purge valve - canister)

  • Leakage from canister pump module

  • Leakage from fuel tank

  • Leakage from canister

 While ignition switch off 2 trip
P0456 EVAP small leak

Leak detection pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure is measured. Reference pressure measured at start and end of leak check.

If stabilized pressure is higher than second reference pressure, ECM determines that EVAP system has a small leak.

 While ignition switch on 2 trip
P1451 EVAP clogged A blockage in the EVAP system pipe is detected.

  • Blockage in EVAP line (canister - fuel tank)

  • Blockage in EVAP line (leak detection pump - canister)

  • Blockage in canister pump module

 While ignition switch on 2 trip
P2404 EVAP malfunction

Leak detection pump ending pressure is more than the threshold.

The difference between the leak detection pump highest pressure and lowest pressure is the threshold value or more.

The vent valve abnormality is detected.

  • Leak detection pump

 While ignition switch on 2 trip

DESCRIPTION

The description can be found in EVAP (Evaporative Emission) System Click here.

MONITOR DESCRIPTION

5 hours*1 after the ignition switch is turned off, the leak detection pump creates negative pressure (vacuum) in the EVAP (Evaporative Emission) system. The ECM monitors for leaks and actuator malfunctions based on the EVAP pressure.

Tech Tips

*: If the enable conditions are not satisfied 5 hours after the ignition switch is turned off, the monitor check starts 2 hours later. If the enable conditions are still not satisfied 7 hours after the ignition switch is turned off, the monitor check starts 2.5 hours later.

Sequence Operation Duration
A Leak detection pump monitor 300 seconds
B First reference pressure measurement 40 seconds
C Vent valve monitor 12 seconds
D Pipe clogging monitor 900 seconds
E Second reference pressure measurement 40 seconds

*: If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.

A004JBDE02
Text in Illustration
*1 Purge valve: OFF (closed) *2 Purge valve: ON (open)
*3 Vent Valve: OFF (vent) *4 Vent Valve: ON (closed)
*5 Leak Detection Pump: OFF *6 Leak Detection Pump: ON
*7 Reference Orifice (0.02 inch) *8 Canister Pressure Sensor
*9 Canister *10 Fuel Tank
*11 Canister Pump Module *12 Canister Filter
*a

Operation A:

Atmospheric Pressure Measurement

 *b

Operation B, E:

Reference Pressure Measurement
*c

Operation C:

EVAP System Pressure Measurement

 *d Atmospheric Pressure
*e Negative Pressure - -

CONFIRMATION DRIVING PATTERN

Note


  • The Evaporative System Check (Automatic Mode) consists of 5 steps performed automatically by the GTS. It takes a maximum of approximately 24 minutes.

  • Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed, making the fuel tank leak check unavailable.

  • Do not run the engine during this operation.

  • When the temperature of the fuel is 35°C (95°F) or more, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the fuel temperature below 35°C (95°F) and the coolant temperature below 45°C (113°F).


  1. Connect the GTS to the DLC3.

  2. Turn the ignition switch to ON and turn the GTS on.

  3. Clear DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the ignition switch off and wait for at least 30 seconds.

  5. Turn the ignition switch to ON and turn the GTS on.

  6. Enter the following menus: Powertrain / Engine / Utility / Evaporative System Check / Automatic Mode.

  7. After the Evaporative System Check is completed, check for All Readiness by entering the following menus: Powertrain / Engine / Utility / All Readiness.

  8. Input the DTC: P0455, P0456, P1451 or P2404.

  9. Check the DTC judgment result.

    GTS Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

  10. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs Click here.

    Tech Tips


    • If a permanent DTC is output, the system is malfunctioning.

    • If no permanent DTC is output, the system is normal.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Trouble Codes.

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC P0455, P0456, P1451 or P2404 is output A
      DTC P0455, P0456, P1451 or P2404 and other DTCs are output B

    A

    GO TO EVAP SYSTEM Click here

    B

    GO TO DTC CHART Click here