Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Evaporative Emission System Pressure Sensor/Switch Circuit Short to Ground (P045011,P045015,P04502A,P04502F)

1. DTC P045011: Canister pressure sensor voltage low

   If the canister pressure sensor voltage output (pressure) is less than 0.45 V: 42.11 kPa(abs) [6.11 psi(abs)], the ECM interprets this as an open or short circuit in the canister pressure sensor or its circuit, and stops the EVAP system monitor. The ECM will illuminate the MIL and store this DTC (1 trip detection logic).

2. DTC P045015: Canister pressure sensor voltage high

   If the canister pressure sensor voltage output (pressure) is higher than 4.9 V: 123.761 kPa(abs) [17.95 psi(abs)], the ECM interprets this as an open or short circuit in the canister pressure sensor or its circuit, and stops the EVAP system monitor. The ECM will illuminate the MIL and store this DTC (1 trip detection logic).

3. DTC P04502A: Canister pressure sensor abnormal voltage being constant

   If the sensor voltage output does not change for 2 minutes, the ECM interprets this as the sensor being stuck, and stops the monitor. The ECM will illuminate the MIL and store this DTC (2 trip detection logic).

4. DTC P04502F: Canister pressure sensor abnormal voltage fluctuation

   If the canister pressure sensor voltage output fluctuates rapidly for 10 seconds, the ECM stops the EVAP system monitor. The ECM interprets this as the canister pressure sensor voltage fluctuating, and stops the EVAP system monitor. The ECM will illuminate the MIL and store this DTC (2 trip detection logic).

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.

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

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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 / Data List / Intake Air Temperature.
9. Check that the intake air temperature is between 4.4 and 50°C (40 and 122°F) [B].
10. Enter the following menus: Powertrain / Engine / Utility / Evaporative System Check / Automatic Mode [C].
11. After the Evaporative System Check is completed, check for All Readiness by entering the following menus: Powertrain / Engine / Utility / All Readiness.
12. Input the DTC: P045011, P045015, P04502A or P04502F.
13. 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 [C]: 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.

NOTICE:

• When a vehicle is brought into the workshop, leave it as it is. Do not change the vehicle condition. For example, do not tighten the fuel tank cap.
• The Techstream is required to conduct the following diagnostic troubleshooting procedure.
• Inspect the fuses for circuits related to this system before performing the following procedure.

NOTICE:

• When replacing the canister pump module, check the canister pump module interior, canister interior and related pipes for water, fuel and other liquids. If liquids are present, check for disconnections and/or cracks in the following: 1) the pipe from the air inlet port to the canister pump module; 2) the canister filter; and 3) the fuel tank vent hose. If liquids are present in the canister interior, replace the canister and canister pump module together.
• Check for filter blockage in the canister. If the charcoal filter inside the canister is clogged, replace the canister and canister pump module together.
• Check for filter blockage in the canister filter. If the canister filter has blockages, replace the canister filter.

Evaporative Emission System Incorrect Purge Flow Actuator Stuck On (P04417E,P04417F,P04419C)

Evaporative Emission System Leak Detected (Large Leak) (P045500,P045600)

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