Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM10000000255VB
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 -           ]
Title: G16E-GTS (ENGINE CONTROL): SFI SYSTEM: P12D501; Fuel Pump Control General Electrical Failure; 2023 - 2025 MY GR Corolla [09/2022 -        ]

DTC

P12D501

Fuel Pump Control General Electrical Failure

DESCRIPTION

Refer to DTC P062712.

Click here 2023 - 2025 MY GR Corolla [09/2022 -        ]; G16E-GTS (ENGINE CONTROL): SFI SYSTEM: P062712; Fuel Pump "A" Control Circuit Short to Battery+

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Note

P12D501

Fuel Pump Control General Electrical Failure

When the fuel pump control ECU operation duty ratio is 3 to 65%, the fuel pump control ECU detects a short in the fuel pump circuit for 3 seconds or more (2 trip detection logic).
  • Short in fuel pump control ECU circuit
  • Fuel pump (for low pressure side)
  • Fuel pump control ECU

Comes on

SAE Code: P12D5

Related Data List

DTC No.

Data List

P12D501

Fuel Pump Control Duty Ratio

MONITOR DESCRIPTION

The fuel pump control ECU monitors the fuel pump drive circuit.

When a malfunction is detected in the fuel pump drive circuit, the diagnosis output circuit in the fuel pump control ECU modifies the operation signal sent by the ECM to indicate that there is a malfunction.

When the fuel pump control ECU operation duty ratio is 3 to 65%, and short in the fuel pump circuit is detected for 3 seconds or more, the diagnosis output circuit in the fuel pump control ECU modifies the operation signal sent by the ECM to indicate that there is a malfunction and the ECM stores a DTC.

MONITOR STRATEGY

Related DTCs

P12D5: Fuel pump circuit short

Required Sensors/Components (Main)

Fuel pump control ECU

Required Sensors/Components (Related)

-

Frequency of Operation

Continuous

Duration

3 seconds

MIL Operation

2 driving cycles

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

None

All of the following conditions are met

-

Output duty cycle

3 to 65%

Battery voltage

10.5 V or higher

Ignition switch

ON

Starter

Off

TYPICAL MALFUNCTION THRESHOLDS

Fuel pump circuit short error from fuel pump control module

Received

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 2023 - 2025 MY GR Corolla [09/2022 -        ]; G16E-GTS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

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

    Click here 2023 - 2025 MY GR Corolla [09/2022 -        ]; G16E-GTS (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

  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. Start the engine and wait 10 seconds or more [A].
  7. Turn the GTS on.
  8. Enter the following menus: Powertrain / Engine / Trouble Codes [B].
  9. 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.
  10. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  11. Input the DTC: P12D501.
  12. 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 is malfunctioning.
    • If the judgment result is INCOMPLETE, run the engine at an engine speed of 2500 rpm or more for 10 seconds or more and check the DTC judgment result again.
    • [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 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

Refer to DTC P062712.

Click here 2023 - 2025 MY GR Corolla [09/2022 -        ]; G16E-GTS (ENGINE CONTROL): SFI SYSTEM: P062712; Fuel Pump "A" Control Circuit Short to Battery+

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.

INSPECT FUEL PUMP CONTROL ECU

(a) Disconnect the fuel pump control ECU connector.

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

*a

Component without harness connected

(Fuel Pump Control ECU)

-

-

Standard Resistance:

Tester Connection

Condition

Specified Condition

O180-2 (FPU) - O172-3 (GND)

Always

2 kΩ or higher

O180-3 (FPV) - O172-3 (GND)

Always

2 kΩ or higher

O180-4 (FPW) - O172-3 (GND)

Always

2 kΩ or higher

HINT:

This procedure checks for an internal short of the fuel pump control ECU when its transistor is stuck on.

NG

REPLACE FUEL PUMP CONTROL ECU 2023 MY GR Corolla [09/2022 - 11/2022]; G16E-GTS (FUEL): FUEL PUMP ECU: REMOVAL 2023 - 2025 MY GR Corolla [11/2022 -        ]; G16E-GTS (FUEL): FUEL PUMP ECU: REMOVAL

OK

2.

PERFORM ACTIVE TEST USING GTS (FUEL PUMP SINGLE PHASE ENERGIZATION)

(a) Disconnect the fuel pump control ECU connector.

(b) Operate the fuel pump control ECU using the Active Test function and measure the voltage according to the value(s) in the table below.

Powertrain > Engine > Active Test

Tester Display

Fuel Pump Single Phase Energization

Standard Voltage:

Tester Connection

GTS Operation

Specified Condition

O180-2 (FPU) - Body ground

U Phase

4.4 to 8.4 V*

O180-3 (FPV) - Body ground

U Phase

8 to 15.5 V

O180-4 (FPW) - Body ground

U Phase

8 to 15.5 V

O180-3 (FPV) - Body ground

V Phase

4.4 to 8.4 V*

O180-2 (FPU) - Body ground

V Phase

8 to 15.5 V

O180-4 (FPW) - Body ground

V Phase

8 to 15.5 V

O180-4 (FPW) - Body ground

W Phase

4.4 to 8.4 V*

O180-2 (FPU) - Body ground

W Phase

8 to 15.5 V

O180-3 (FPV) - Body ground

W Phase

8 to 15.5 V

HINT:

  • *: This Active Test limits the fuel pump control ECU output duty cycle to 50%. Therefore, the output voltage of the fuel pump control ECU will be approximately 50% of the power source voltage (+B terminal).
  • Before performing this inspection, check that the battery voltage is between 11 and 14 V (not depleted).

*a

Component without harness connected

(Fuel Pump Control ECU)
NG

REPLACE FUEL PUMP CONTROL ECU 2023 MY GR Corolla [09/2022 - 11/2022]; G16E-GTS (FUEL): FUEL PUMP ECU: REMOVAL 2023 - 2025 MY GR Corolla [11/2022 -        ]; G16E-GTS (FUEL): FUEL PUMP ECU: REMOVAL

OK

3.

CHECK HARNESS AND CONNECTOR (FUEL PUMP CONTROL ECU - FUEL PUMP (FOR LOW PRESSURE SIDE))

(a) Disconnect the fuel pump control ECU connector.

(b) Disconnect the fuel pump (for low pressure side) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O180-2 (FPU) or O45-3 (BLPU) - Body ground and other terminals

Always

10 kΩ or higher

O180-3 (FPV) or O45-4 (BLPV) - Body ground and other terminals

Always

10 kΩ or higher

O180-4 (FPW) or O45-2 (BLPW) - Body ground and other terminals

Always

10 kΩ or higher

HINT:

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

Click here 2023 - 2025 MY GR Corolla [09/2022 -        ]; G16E-GTS (ENGINE CONTROL): SFI SYSTEM: INITIALIZATION

OK

REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE) 2023 MY GR Corolla [09/2022 - 11/2022]; G16E-GTS (FUEL): FUEL PUMP: REMOVAL 2023 - 2025 MY GR Corolla [11/2022 -        ]; G16E-GTS (FUEL): FUEL PUMP: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR