Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Evaporative Emission System Leak Detected (Large Leak) (P045500,P045600)

Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual / Engine & Hybrid System / 2gr-fks (engine Control) / Sfi System / Evaporative Emission System Leak Detected (Large Leak) (P045500,P045600)

DTC SUMMARY

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P045500

Evaporative Emission System Leak Detected (Large 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 0.2], ECM determines that EVAP system has a large leak.
  • Fuel tank cap (loose)
  • Leakage from EVAP line (canister - fuel tank)
  • Leakage from EVAP line (purge VSV - canister)
  • Leakage from canister pump module
  • Leakage from fuel tank
  • Leakage from canister

Comes on

DTC stored

SAE Code: P0455

P045600

Evaporative Emission System Leak Detected (Very 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.
  • Fuel tank cap (loose)
  • Leakage from EVAP line (canister - fuel tank)
  • Leakage from EVAP line (purge VSV - canister)
  • Leakage from canister pump module
  • Leakage from fuel tank
  • Leakage from canister

Comes on

DTC stored

SAE Code: P0456

DTC No.

Monitoring Item

Detection Timing

Detection Logic

SAE

P045500

EVAP gross leak

EVAP monitoring

(engine switch off)

2 trip

P0455

P045600

EVAP small leak

P0456

DESCRIPTION

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

Click here

MONITOR DESCRIPTION

5 hours* after the engine 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.

HINT:

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

Sequence

Operation

Description

Duration

-

ECM activation

Activated by soak timer 5, 7 or 9.5 hours after engine switch turned off.

-

A

Atmospheric pressure measurement

Vent valve is turned off (vent) and EVAP system pressure is measured by ECM in order to register atmospheric pressure.

If pressure in EVAP system is not between 70 to 110 kPa(abs) [10.15 to 15.95 psi(abs)], ECM cancels EVAP system monitor.

60 seconds

B

First reference pressure measurement

In order to determine reference pressure, leak detection pump creates negative pressure (vacuum) through reference orifice and then ECM checks if leak detection pump and vent valve operate normally.

360 seconds

C

EVAP system pressure measurement

Vent valve is turned on (closed) to shut EVAP system.

Negative pressure (vacuum) is created in EVAP system, and EVAP system pressure is then measured.

Write down measured value as it will be used in leak check. If EVAP pressure does not stabilize within 15 minutes, ECM cancels EVAP system monitor.

15 minutes*

D

Purge VSV monitor

Purge VSV is opened and then EVAP system pressure is measured by ECM.

Large increase indicates normal.

10 seconds

E

Second reference pressure measurement

After second reference pressure measurement, leak check is performed by comparing first and second reference pressure measurements.

If stabilized system pressure is higher than second reference pressure, ECM determines that EVAP system is leaking.

60 seconds

-

Final check

Atmospheric pressure is measured and then monitoring result is recorded by ECM.

-

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

*1

Purge VSV: Off (Closed)

*2

Purge VSV: 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

Operation D:

Purge VSV Monitor

*e

Atmospheric Pressure

*f

Negative Pressure
  • (a) P045500: EVAP (Evaporative Emission) gross leak

    In operation C, the leak detection 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 reference pressure x 0.2] (near atmospheric pressure), the ECM determines that the EVAP system has a large leak, illuminates the MIL and stores this DTC (2 trip detection logic).

  • (b) P045600: EVAP very small leak

    In operation C, the leak detection 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 reference pressure, the ECM determines that the EVAP system has a small leak, illuminates the MIL and stores this DTC (2 trip detection logic).

MONITOR STRATEGY

Required Sensors/Components (Main)

Purge VSV

Canister pump module

Required Sensors/Components (Related)

-

Frequency of Operation

Once per driving cycle

Duration

Within 20 minutes (varies with amount of fuel in tank)

MIL Operation

2 driving cycles

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

None

Atmospheric pressure

70 kPa(abs) [10.15 psi(abs)] or higher, and less than 110 kPa(abs) [15.95 psi(abs)]

Battery voltage

10.5 V or higher

Vehicle speed

Less than 4 km/h (2.5 mph)

Engine switch

Off

Time after key-off

5, 7 or 9.5 hours

Canister pressure sensor malfunction (P0452, P0453)

Not detected

Purge VSV

Not operated by scan tool

Vent valve

Not operated by scan tool

Leak detection pump

Not operated by scan tool

Both of following conditions met before-key off

1 and 2

1. Duration that vehicle is driven

5 minutes or more

2. EVAP purge operation

Performed

Engine coolant temperature

4.4°C (40°F) or higher, and less than 35°C (95°F)

Intake air temperature

4.4°C (40°F) or higher, and less than 35°C (95°F)

TYPICAL MALFUNCTION THRESHOLDS

P0455: EVAP Gross Leak

EVAP pressure when vacuum introduction is complete

Higher than [reference pressure x 0.2]
P0456: EVAP Small Leak

EVAP pressure when vacuum introduction is complete

Between reference pressure and [reference pressure x 0.2]

MONITOR RESULT

Refer to EVAP system.

Click here

CONFIRMATION DRIVING PATTERN

NOTICE:

  • The Evaporative System Check (Automatic Mode) consists of 6 steps performed automatically by the Techstream. It takes a maximum of approximately 24 minutes.
  • Do not perform the Evaporative System Check when the fuel tank is higher than 85% 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 higher, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the fuel temperature less than 35°C (95°F).

HINT:

  • After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

    Click here

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

    Click here

  1. Connect the Techstream to the DLC3.
  2. Turn the engine switch on (IG).
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the engine switch off and wait for at least 30 seconds.
  6. Turn the engine switch on (IG) [A].
  7. Turn the Techstream on.
  8. Enter the following menus: Powertrain / Engine / Utility / Evaporative System Check / Automatic Mode [B].
  9. After the Evaporative System Check is completed, check for All Readiness by entering the following menus: Powertrain / Engine / Utility / All Readiness.
  10. Input the DTC: P045500 or P045600.
  11. Check the DTC judgment result.

    Techstream 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

    HINT:

    • If the judgment result is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system is malfunctioning.
    • [A] to [B]: Normal judgment procedure.

      The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

    • When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

PROCEDURE

1.

GO TO EVAP SYSTEM

(a) Refer to EVAP System.

Click here

NEXT

END
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