Toyota Yaris: Sfi System / Fuel Rail / System Pressure - Too Low (P008700)

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Engine & Hybrid System / G16e-gts (engine Control) / Sfi System / Fuel Rail / System Pressure - Too Low (P008700)

DESCRIPTION

The high-pressure direct injection fuel system consists of a spill control valve, check valve, fuel relief valve, fuel pressure sensor (for high pressure side), fuel pump assembly (for high pressure side) and direct fuel injector assemblies. The spill control valve adjusts the return volume of high-pressure fuel. The check valve mechanically opens and closes the path to the fuel delivery pipe. The relief valve releases the fuel back to the fuel tank if there is a malfunction in the high-pressure fuel system. The fuel pump assembly (for high pressure side) is installed to the cylinder head cover and operated by a cam installed to the exhaust camshaft. Rotation of the camshaft moves the pump plunger inside the fuel pump assembly (for high pressure side) up and down, pressurizing the fuel. The pressurized fuel opens the check valve and is pumped into the fuel delivery pipe. The ECM controls the spill control valve to adjust the fuel pressure between 2.4 and 20 MPa (24.5 and 204 kgf/cm2, 406 and 2900 psi) and monitors signals from the fuel pressure sensor (for high pressure side) to maintain the target fuel pressure.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Note

P008700

Fuel Rail / System Pressure - Too Low

Either of the following conditions is met (1 trip detection logic):

  • The actual fuel pressure is lower than the target fuel pressure value by 5 MPa (51.0 kgf/cm2, 725 psi) or more for 10 seconds or more during in-cylinder injection.
  • The actual fuel pressure value is lower than the target fuel pressure value by 2 MPa (20.4 kgf/cm2, 290 psi) or more for 15 seconds or more during port injection only.
  • Leak of fuel
  • Fuel pipe (fuel tank - fuel pump assembly (for high pressure side))
  • Fuel pipe (fuel pump assembly (for high pressure side) - direct fuel injector assembly)
  • Direct fuel injector assembly
  • Fuel pump assembly (for high pressure side)
  • Fuel pump (for low pressure side)
  • Fuel pressure sensor (for high pressure side)
  • Fuel system
  • ECM

Comes on

SAE: P0087

MONITOR DESCRIPTION

If the fuel pressure (for high pressure side) decreases despite an increase 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

Required Sensors/Components

Fuel pressure sensor (for high pressure side)

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. Record the Freeze Frame Data.
  5. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  6. Turn the ignition switch off and wait for at least 30 seconds.
  7. Start the engine.
  8. Turn GTS on.
  9. 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.
  10. Enter the following menus: Powertrain / Engine / Trouble Codes.
  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: P008700.
  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.

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 FUEL LEAK

(a) Check around and beneath the vehicle for fuel leaks, fumes, etc.

OK:

No fuel leaks present.

NG

REPAIR OR REPLACE FUEL LEAK POINT

OK

2.

CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P008700)

(a) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

P008700 is output

A

P008700 and other DTCs are output

B

HINT:

If any DTCs other than P008700 are output, troubleshoot those DTCs first.

B

GO TO DTC CHART

A

3.

CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST

(a) Has the vehicle run out of fuel in the past?

YES

DTC CAUSED BY RUNNING OUT OF FUEL

NO

4.

CHECK MISFIRE COUNT OF DIRECT INJECTION

(a) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

(b) Enter the following menus.

Powertrain > Engine > Active Test

Active Test Display

Control the Injection Mode

Data List Display

Injection Mode

Misfire Count Cylinder #1

Misfire Count Cylinder #2

Misfire Count Cylinder #3

(c) According to the display on the GTS, read the Data List with the Active Test "Control the Injection Mode" set to Direct.

Injection Mode

Misfire Count

Proceed to

Direct

No misfire counts, or misfire counts occur randomly in all cylinders

A

Misfire counts occur in a particular cylinder

B

HINT:

Perform "Inspection After Repair" after replacing the direct fuel injector assembly.

Click here

B

REPLACE DIRECT FUEL INJECTOR ASSEMBLY

A

5.

INSPECT FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE)

(a) Enter the following menus.

Powertrain > Engine > Data List

Tester Display

Fuel Pressure (High)

(b) Start the engine.

(c) Check that the fuel pressure fluctuates when the engine condition changes from idling to racing.

Result

Proceed to

Fuel pressure does not rise

A

Fuel pressure does not fluctuate

B

Fuel pressure fluctuates

C

HINT:

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

Click here

B

REPLACE FUEL PRESSURE SENSOR (FOR HIGH PRESSURE SIDE)

C

GO TO STEP 8

A

6.

CHECK FUEL PUMP OPERATION (FOR LOW PRESSURE SIDE)

(a) Check the fuel pump operation (for low pressure side).

Click here

HINT:

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

Click here

NG

GO TO FUEL PUMP CONTROL CIRCUIT

OK

7.

CHECK FUEL PRESSURE (FOR LOW PRESSURE SIDE)

(a) Check the fuel pressure (for low pressure side).

Click here

NG

REPAIR OR REPLACE FUEL SYSTEM

OK

8.

REPLACE FUEL PUMP ASSEMBLY (FOR HIGH PRESSURE SIDE)

Click here

HINT:

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

Click here

NEXT

9.

CLEAR DTC

(a) Clear the DTCs.

Powertrain > Engine > Clear DTCs

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

NEXT

10.

CHECK IF DTC OUTPUT RECURS (SEE IF DTC P008700 IS OUTPUT AGAIN)

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

(b) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTCs are not output

A

P008700 is output

B

A

END

B

REPLACE ECM

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