Toyota RAV4 manuals

Toyota Sienna Service Manual: Evaporative Emission Control System Leak Detected

DTC P0455 Evaporative Emission Control System Leak Detected (Gross Leak)

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

DTC SUMMARY

DTC SUMMARY

DESCRIPTION

The circuit description can be found in the EVAP (Evaporative Emission) System.

INSPECTION PROCEDURE

Refer to the EVAP System.

MONITOR DESCRIPTION

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

HINT: *1: If the engine coolant temperature is not below 35C (95F) 5 hours after the ignition switch is turned off, the monitor check starts 2 hours later. If it is still not below 35C (95F) 7 hours after the ignition switch is turned off, the monitor check starts 2.5 hours later.

MONITOR DESCRIPTION

MONITOR DESCRIPTION

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

MONITOR DESCRIPTION

  1.  P0455: EVAP (Evaporative Emission) gross leak
    In operation C, the vacuum pump creates negative pressure (vacuum) in the EVAP system and the EVAP system pressure is measured. If the stabilized system pressure is higher than [second 0.02 inch leak pressure standard x 0.2] (near atmospheric pressure), the ECM determines that the EVAP system has a large leak, illuminates the MIL and sets the DTC (2 trip detection logic).
  2. 2. P0456: EVAP very small leak
    In operation C, the vacuum pump creates negative pressure (vacuum) in the EVAP system and the EVAP system pressure is measured. If the stabilized system pressure is higher than second 0.02 inch leak pressure standard, the ECM determines that the EVAP system has a small leak, illuminates the MIL and sets the DTC (2 trip detection logic).

MONITOR DESCRIPTION

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

YPICAL ENABLING CONDITIONS

YPICAL ENABLING CONDITIONS

Key-off monitor sequence 1 to 8

1. Atmospheric pressure measurement

Key-off monitor sequence

2. First reference pressure measurement

Key-off monitor sequence

3. EVAP canister vent valve close stuck check

Key-off monitor sequence

4. Vacuum introduction

Key-off monitor sequence

5. EVAP canister purge valve close stuck check

Key-off monitor sequence

6. Second reference pressure measurement

Key-off monitor sequence

7. Leak check

Key-off monitor sequence

8. Atmospheric pressure measurement

Key-off monitor sequence

TYPICAL MALFUNCTION THRESHOLDS

P0455: EVAP gross leak

Key-off monitor sequence

P0456: EVAP 0.02 inch leak

Key-off monitor sequence

MONITOR RESULT

Refer to CHECKING MONITOR STATUS

Evaporative Emission Control System Pressure
DTC P0450 Evaporative Emission Control System Pressure Sensor / Switch DTC P0451 Evaporative Emission Control System Pressure Sensor Range / Performance DTC P0452 Evaporative Emission Control Syst ...

Vehicle Speed Sensor "A"
DTC P0500 Vehicle Speed Sensor "A" DESCRIPTION The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU. The skid control ECU converts these ...

Other materials:

Dtc clear
(A) when using the obd ii scan tool or intelligent tester: clearing the dtcs. (1) Connect the intelligent tester together with the CAN VIM (controller area network vehicle interface module) to the DLC3. (2) Turn the ignition switch to the ON position and turn the OBD II scan tool or the inte ...

Precaution
NOTICE: Perform the RESET MEMORY (AT initialization) when replacing the automatic transaxle assembly, engine assembly or ECM (See page AX-16). Perform the REGISTRATION (VIN registration) when replacing the ECM (See page ES-15). HINT: RESET MEMORY can not be ...

Compressor and magnetic clutch
COMPONENTS ...

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