Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001B4B8
Model Year Start: 2019 Model: Avalon HV Prod Date Range: [04/2018 -           ]
Title: A25A-FXS (ENGINE CONTROL): SFI SYSTEM: P008800; Fuel Rail / System Pressure - Too High; 2019 - 2022 MY Avalon HV [04/2018 -        ]

DTC

P008800

Fuel Rail / System Pressure - Too High

DESCRIPTION

Refer to DTC P008700.

Click here 2019 - 2022 MY Avalon HV [04/2018 -        ]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: P008700; Fuel Rail / System Pressure - Too Low+

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P008800

Fuel Rail / System Pressure - Too High

Although the ECM is requesting the fuel pump assembly (for high pressure side) to open the spill control valve, fuel pressure increases 3 MPa (30.6 kgf/cm2, 435 psi) from target pressure for about 10 seconds (1 trip detection logic).

  • Fuel pump assembly (for high pressure side)
  • Fuel pressure sensor (for high pressure side)
  • ECM

Comes on

DTC stored

SAE Code: P0088

MONITOR DESCRIPTION

If the fuel pressure (for high pressure side) increases despite a decrease request signal being sent to the fuel pump assembly (for high pressure side) by the ECM, the ECM will illuminate the MIL and store this DTC.

MONITOR STRATEGY

Related DTCs

P0088: Fuel pressure too high

Required Sensors/Components (Main)

Fuel pressure sensor (for high pressure side)

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

About 10 seconds

MIL Operation

Immediate

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

None

Time after engine start

0.2 seconds or more

Time after fuel cut finished

3 seconds or more

Target fuel pressure

Small change

Injection mode

Direct injection or dual injection

TYPICAL MALFUNCTION THRESHOLDS

Difference in fuel pressure between actual and target

3 MPa (30.6 kgf/cm2, 435 psi) or higher

CONFIRMATION DRIVING PATTERN

HINT:

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

    Click here 2019 - 2022 MY Avalon HV [04/2018 -        ]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  • Permanent misfire and fuel system DTCs can only be cleared when performing the universal trip driving pattern when no malfunction is detected.
  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG).
  3. Turn the Techstream on.
  4. Record the Freeze Frame Data.
  5. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  6. Turn the power switch off and wait for at least 30 seconds.
  7. Turn the power switch on (IG).
  8. Turn the Techstream on.
  9. Put the engine in Inspection Mode (Maintenance Mode).

    Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: INSPECTION MODE PROCEDURE

  10. Start the engine.
  11. Based on the engine speed, engine load, injection mode and other conditions displayed in the Freeze Frame Data, reproduce the conditions present when the DTC was stored.
  12. Enter the following menus: Powertrain / Engine / Trouble Codes.
  13. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  14. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  15. Input the DTC: P008800.
  16. 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 has a malfunction.

CAUTION / NOTICE / HINT

NOTICE:

  • 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.

    Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): VEHICLE CONTROL HISTORY 2021 - 2022 MY Avalon HV [08/2020 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY): VEHICLE CONTROL HISTORY

    (Select Powertrain in Health Check and then check the time stamp data.)

    Click here 2019 - 2022 MY Avalon HV [04/2018 -        ]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  • 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.

    Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): VEHICLE CONTROL HISTORY 2021 - 2022 MY Avalon HV [08/2020 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY): VEHICLE CONTROL HISTORY

HINT:

Read Freeze Frame Data using the Techstream. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1.

CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P008800)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Trouble Codes.

(e) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTC P008800 is output

A

DTC P008800 and other DTCs are output

B

HINT:

If any DTCs other than P008800 are output, troubleshoot those DTCs first.

B

GO TO DTC CHART 2019 MY Avalon HV [04/2018 - 08/2019]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: DIAGNOSTIC TROUBLE CODE CHART 2020 MY Avalon HV [08/2019 - 08/2020]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: DIAGNOSTIC TROUBLE CODE CHART 2021 MY Avalon HV [08/2020 - 08/2021]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: DIAGNOSTIC TROUBLE CODE CHART 2022 MY Avalon HV [08/2021 -        ]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: DIAGNOSTIC TROUBLE CODE CHART

A

2.

INSPECT FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

Tester Display

Inspection Mode

(e) Start the engine.

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

Powertrain > Engine > Data List

Tester Display

Fuel Pressure (High)

(g) According to the display on the Techstream, read the Data List while racing the engine.

OK:

Fuel pressure fluctuates.

HINT:

Perform "Inspection After Repair" after replacing the fuel pressure sensor (for high pressure side).

Click here 2019 MY Avalon HV [04/2018 - 08/2019]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION 2020 - 2021 MY Avalon HV [08/2019 - 08/2021]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION 2022 MY Avalon HV [08/2021 -        ]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

NG

REPLACE FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE) 2019 - 2021 MY Avalon HV [04/2018 - 08/2021]; A25A-FXS (FUEL): FUEL PRESSURE SENSOR (for High Pressure): REMOVAL 2022 MY Avalon HV [08/2021 -        ]; A25A-FXS (FUEL): FUEL PRESSURE SENSOR (for High Pressure): REMOVAL

OK

3.

REPLACE FUEL (ENGINE ROOM SIDE) PUMP ASSEMBLY (FOR HIGH PRESSURE SIDE)

(a) Replace the fuel pump assembly (for high pressure side).

Click here 2019 - 2021 MY Avalon HV [04/2018 - 08/2021]; A25A-FXS (FUEL): FUEL PUMP (for High Pressure): REMOVAL 2022 MY Avalon HV [08/2021 -        ]; A25A-FXS (FUEL): FUEL PUMP (for High Pressure): REMOVAL

HINT:

Perform "Inspection After Repair" after replacing the fuel pump assembly (for high pressure side).

Click here 2019 MY Avalon HV [04/2018 - 08/2019]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION 2020 - 2021 MY Avalon HV [08/2019 - 08/2021]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION 2022 MY Avalon HV [08/2021 -        ]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

NEXT

4.

CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTCs.

Powertrain > Engine > Clear DTCs

(e) Turn the power switch off and wait for at least 30 seconds.

NEXT

5.

CHECK IF DTC OUTPUT RECURS (SEE IF DTC P008800 IS OUTPUT AGAIN)

(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(b) Enter the following menus: Powertrain / Engine / Trouble Codes.

(c) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTC P008800 is output

B

A

END

B

REPLACE ECM 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; A25A-FXS (ENGINE CONTROL): ECM: REMOVAL 2021 MY Avalon HV [08/2020 - 08/2021]; A25A-FXS (ENGINE CONTROL): ECM: REMOVAL 2022 MY Avalon HV [08/2021 -        ]; A25A-FXS (ENGINE CONTROL): ECM: REMOVAL