Toyota Yaris: Sfi System / Low Pressure Fuel System Pressure - Too High (P008B00)

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Engine & Hybrid System / G16e-gts (engine Control) / Sfi System / Low Pressure Fuel System Pressure - Too High (P008B00)

DESCRIPTION

Refer to DTC P008A00.

Click here

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Note

P008B00

Low Pressure Fuel System Pressure - Too High

The actual fuel pressure (for low pressure side) value is higher than target fuel pressure (for low pressure side) by 200 kPa [29 psi] or more (1 trip detection logic).

  • Fuel pump control ECU
  • No. 2 fuel pressure sensor (for low pressure side)
  • ECM

-

SAE: P008B

MONITOR DESCRIPTION

If the fuel pressure (for low pressure side) increases despite a decrease request signal being sent to the fuel pump control ECU by the ECM, the ECM will store this DTC.

MONITOR STRATEGY

Frequency of Operation

Continuous

CONFIRMATION DRIVING PATTERN

  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the GTS on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the ignition switch off and wait for at least 30 seconds.
  6. Turn the ignition switch to ON [A].
  7. Turn the GTS on.
  8. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [B].
  9. Drive the vehicle for 15 minutes or more [C].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

  10. Enter the following menus: Powertrain / Engine / Trouble Codes [D].
  11. 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.
  12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  13. Input the DTC: P008B00.
  14. Check the DTC judgment result.

    GTS 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.
    • If the judgment result is INCOMPLETE, perform steps [B] through [D] again.

CAUTION / NOTICE / HINT

HINT:

Read Freeze Frame Data using the GTS. 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 P008B00)

(a) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

P008B00 is output

A

P008B00 and other DTCs are output

B

HINT:

If any DTCs other than P008B00 are output, troubleshoot those DTCs first.

B

GO TO DTC CHART

A

2.

READ VALUE USING GTS (FUEL PRESSURE (LOW) / FUEL PRESSURE 2)

(a) Start the engine.

(b) Enter the following menus.

Powertrain > Engine > Data List

Tester Display

Fuel Pressure (Low) / Fuel Pressure 2

(c) Record the Fuel Pressure (Low) / Fuel Pressure 2 value.

(d) Turn the ignition switch off.

(e) Discharge the fuel pressure.

(1) Remove the EFI-MAIN NO. 2 fuse from the No. 5 luggage room relay block assembly.

(2) Start the engine.

(3) After the engine has stopped on its own, turn the ignition switch off.

HINT:

If the engine does not stop naturally, perform direct injection by racing the engine to reduce the fuel pressure [Fuel Pressure (High)] and stop the engine.

(4) Crank the engine again and make sure that the engine does not start.

(5) Install the EFI-MAIN NO. 2 fuse.

(f) Enter the following menus.

Powertrain > Engine > Data List

Tester Display

Fuel Pressure (Low) / Fuel Pressure 2

(g) Compare the Fuel Pressure (Low) / Fuel Pressure 2 value recorded with the engine running to the Fuel Pressure (Low) / Fuel Pressure 2 value currently shown on the GTS.

Result

Proceed to

Fuel Pressure (Low) / Fuel Pressure 2 value drops

A

Fuel Pressure (Low) / Fuel Pressure 2 value is maintained

B

HINT:

Perform "Inspection After Repair" after replacing the No. 2 fuel pressure sensor (for low pressure side).

Click here

B

REPLACE NO. 2 FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE)

A

3.

PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP DUTY RATIO (BRUSHLESS))

(a) Install the fuel pressure gauge (for low pressure line of low pressure side).

Click here

(b) Enter the following menus.

Powertrain > Engine > Active Test

Active Test Display

Control the Fuel Pump Duty Ratio (Brushless)

Data List Display

Target Fuel Pressure (Low) / Target Fuel Pressure 2

(c) Compare the values in the Data List using the GTS and the fuel pressure gauge when the Active Test was performed.

Standard:

GTS Operation

Standard

Low

Data List value and fuel pressure gauge are within +/-50 kPa of each other

High

HINT:

Perform "Inspection After Repair" after replacing the No. 2 fuel pressure sensor (for low pressure side).

Click here

NG

REPLACE NO. 2 FUEL PRESSURE SENSOR (FOR LOW PRESSURE SIDE)

OK

4.

PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP DUTY RATIO (BRUSHLESS))

(a) Install the fuel pressure gauge (for low pressure line of low pressure side).

Click here

(b) Enter the following menus.

Powertrain > Engine > Active Test

Active Test Display

Control the Fuel Pump Duty Ratio (Brushless)

Data List Display

Target Fuel Pressure (Low) / Target Fuel Pressure 2

(c) Read the values on the Data List and the fuel pressure gauge when the Active Test was performed.

GTS Operation

Fuel Pressure (Low) / Fuel Pressure 2

Fuel Pressure Gauge

Proceed to

Low

Below 600 kPag

Below 600 kPa (6.1 kgf/cm2, 87 psi)

A

600 kPag or higher

600 kPa (6.1 kgf/cm2, 87 psi) or higher

B

B

REPLACE FUEL PUMP CONTROL ECU

A

5.

CLEAR DTC

(a) Clear the DTCs.

Powertrain > Engine > Clear DTCs

(b) Turn the ignition switch off and wait for at least 30 seconds.

NEXT

6.

CHECK WHETHER DTC OUTPUT RECURS (DTC P008B00)

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

(b) Enter the following menus.

Powertrain > Engine > Utility

Tester Display

All Readiness

(c) Input the DTC: P008B00.

(d) Check the DTC judgment result.

Result

Proceed to

NORMAL

(DTCs are not output)

A

ABNORMAL

(P008B00 is output)

B

A

CHECK FOR INTERMITTENT PROBLEMS

B

REPLACE ECM

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