A25A-FXS (ENGINE CONTROL): SFI SYSTEM: P145011,P145015,P14502A,P14502F; Fuel Tank Pressure Sensor Circuit Short to Ground; 2019 - 2022 MY Avalon HV [04/2018

P145011: Fuel tank pressure sensor voltage low
If the fuel tank pressure sensor output voltage (pressure) is less than 0.25 V: -17.1875 kPa(gauge) -2.4922 psi(gauge)], the ECM interprets this as an open or short circuit in the fuel tank pressure sensor or its circuit, and stops the EVAP system monitor. If any deterioration has occurred, the ECM will illuminate the MIL and store this DTC (1 trip detection logic).
P145015: Fuel tank pressure sensor voltage high
If the fuel tank pressure sensor output voltage (pressure) is higher than 4.95 V: 23.9375 kPa(gauge) [3.4709 psi(gauge)], the ECM interprets this as an open or short circuit in the pressure sensor or its circuit, and stops the EVAP system monitor. If any deterioration has occurred, the ECM will illuminate the MIL and store this DTC (1 trip detection logic).
P14502A: Fuel tank pressure sensor being constant (Stuck monitor)
If the fuel tank pressure sensor output voltage does not change, the ECM interprets this as the sensor voltage being constant, and stops the EVAP system monitor. The ECM then illuminates the MIL and stores this DTC (2 trip detection logic).
P14502F: Fuel tank pressure sensor abnormal voltage fluctuation (Noise monitor)
If the fuel tank pressure sensor output voltage fluctuates rapidly for 10 seconds, the ECM stops the EVAP system monitor. The ECM interprets this as the fuel tank pressure sensor voltage fluctuating, and stops the EVAP system monitor. The ECM then illuminates the MIL and stores the DTC.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

P1451 (Noise Monitoring)

P1451 (Stuck Monitoring)

P1452 and P1453

TYPICAL MALFUNCTION THRESHOLDS

P1451: Fuel Tank Pressure Sensor Noise

P1451: Fuel Tank Pressure Sensor Stuck

P1452: Fuel Tank Pressure Sensor Range Check (Low Voltage)

P1453: Fuel Tank Pressure Sensor Range Check (High Voltage)

CONFIRMATION DRIVING PATTERN

NOTICE:

The Evaporative System Check (Automatic Mode) consists of 9 steps performed automatically by the Techstream. It takes a maximum of approximately 40 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 start the engine during this operation.
When the temperature of the fuel is 35°C (95°F) or higher, a large amount of vapor will from and any check result will be 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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Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off and wait for at least 30 seconds.
Turn the power switch on (IG) [A].
Turn the Techstream on.
Enter the following menus: Powertrain / Engine / Utility / Evaporative System Check / Automatic Mode [B].
After the "Evaporative System Check" is completed, check for All Readiness by entering the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P145011, P145015, P14502A or P14502F.

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 auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

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 assembly.
The Techstream is required to conduct the following diagnostic troubleshooting procedure.
Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the Freeze Frame Data and Vehicle Control History can be useful for troubleshooting.
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(Select Powertrain in Health Check and then check the time stamp data.)

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If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.
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PROCEDURE

Powertrain > Engine > Trouble Codes

(f) Enter the following menus: Powertrain / Engine / Data List / Vapor Pressure Fuel Tank Sensor.

Powertrain > Engine > Data List

Powertrain > Engine > Clear DTCs

(a) Perform the Evaporative System Check using the Techstream, referring to the Confirmation Driving Pattern.

DTC SUMMARY

DESCRIPTION

MONITOR DESCRIPTION