Toyota Avalon Service & Repair Manual: High Pressure Fuel Pump Circuit Open (P123513)

Toyota Avalon Service & Repair Manual / Engine / A25a-fxs Engine Control / Sfi System / High Pressure Fuel Pump Circuit Open (P123513)

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 the high-pressure fuel. The check valve mechanically opens and closes the paths to the fuel delivery pipes. The relief valve releases the fuel back to the fuel tank if the high-pressure fuel system malfunctions. The fuel pump assembly (for high pressure side) is installed to the cylinder head cover and operated by a cam installed to the end of 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.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P123513

High Pressure Fuel Pump Circuit Open

Open or short in fuel pump assembly (for high pressure side) circuit detected 60 times or more (1 trip detection logic).

  • Open or short in fuel pump assembly (for high pressure side) circuit
  • Fuel pump assembly (for high pressure side)
  • ECM

Comes on

DTC stored

SAE Code: P1235

MONITOR DESCRIPTION

If an open or short in the fuel pump assembly (for high pressure side) circuit is detected after the engine is started, the ECM will illuminate the MIL and store this DTC.

MONITOR STRATEGY

Related DTCs

P1235: Fuel pump (for high pressure side) circuit/open

Required Sensors/Components (Main)

Fuel pump assembly (for high pressure side)

Required Sensors/Components (Related)

Injector driver (ECM)

Frequency of Operation

Continuous

Duration

-

MIL Operation

Immediate

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

None

All of the following conditions are met

-

Time after engine start

5 seconds or more

Command to injector driver relay

On

Output duty cycle

5 to 95%

Auxiliary battery voltage

10.5 V or higher

Power switch

On (IG)

Engine

Running

TYPICAL MALFUNCTION THRESHOLDS

One of the following conditions is met

1, 2, 3, 4 or 5

1. Both of the following conditions are met

-

Following condition is met

60 time or more

High pressure fuel pump voltage detected by injector driver IC

4.8 V or higher

2. Both of the following conditions are met

-

Following condition is met

60 time or more

High pressure fuel pump voltage detected by injector driver IC

1.2 V or less

3. Both of the following conditions are met

-

Following condition is met

60 time or more

High pressure fuel pump current detected by injector driver IC

140 A or higher

4. Both of the following conditions are met

-

Following condition is met

60 time or more

High pressure fuel pump drive MOSFET current detected by injector driver IC

12 A or higher

5. Both of the following conditions are met

-

Following condition is met

60 time or more

High pressure fuel pump drive MOSFET voltage detected by injector driver IC

0.02 V or less

CONFIRMATION DRIVING PATTERN

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.

    Click here

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

    Click here

  1. Connect the Techstream to the DLC3.
  2. Turn the power 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 power switch off and wait for at least 30 seconds.
  6. Turn the power switch on (IG).
  7. Turn the Techstream on.
  8. Put the engine in Inspection Mode (Maintenance Mode).

    Click here

  9. Start the engine [A].
  10. Idle the engine for 10 seconds [B].
  11. Enter the following menus: Powertrain / Engine / Trouble Codes [C].
  12. 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.
  13. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  14. Input the DTC: P123513.
  15. 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.
    • If the judgment result is INCOMPLETE, perform steps [B] through [C] again.
    • [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 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:

  • 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

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

    Click here

  • 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

HINT:

  • If the current from the D INJ relay is cut because DTC P062D13 is stored, DTC P123513 will be stored even if the fuel pump assembly (for high pressure side) is normal.
  • 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.

INSPECT FUEL PUMP ASSEMBLY (FOR HIGH PRESSURE SIDE)

(a) Inspect the 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

NG

REPLACE FUEL PUMP ASSEMBLY (FOR HIGH PRESSURE SIDE)

OK

2.

CHECK HARNESS AND CONNECTOR (FUEL PUMP ASSEMBLY (FOR HIGH PRESSURE SIDE) - ECM)

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

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

C29-1 (FP+) - C55-19 (FP1+)

Always

Below 1 Ω

C29-2 (FP-) - C55-18 (FP1-)

Always

Below 1 Ω

C29-1 (FP+) or C55-19 (FP1+) - Body ground and other terminals

Always

10 kΩ or higher

C29-2 (FP-) or C55-18 (FP1-) - Body ground and other terminals

Always

10 kΩ or higher

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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