Toyota Yaris: Sfi System / Fuel Pump Control General Electrical Failure (P12D501)

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Engine & Hybrid System / G16e-gts (engine Control) / Sfi System / Fuel Pump Control General Electrical Failure (P12D501)

DESCRIPTION

Refer to DTC P062712.

Click here

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 (1 trip detection logic).

  • Short in fuel pump control ECU circuit
  • Fuel pump (for low pressure side)
  • Fuel pump control ECU

-

SAE: 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

Required Sensors/Components

Fuel pump control ECU

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.
  7. Turn the GTS on.
  8. Start the engine and wait 10 seconds or more.
  9. Enter the following menus: Powertrain / Engine / Trouble Codes.
  10. 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.
  11. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  12. Input the DTC: P12D501.
  13. 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.

WIRING DIAGRAM

Refer to DTC P062712.

Click here

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.

*1

Fuel Pump Control ECU

-

-

Standard Resistance:

Tester Connection

Condition

Specified Condition

O1-2 (FPU) - O2-3 (GND)

Always

2 kΩ or higher

O1-3 (FPV) - O2-3 (GND)

Always

2 kΩ or higher

O1-4 (FPW) - O2-3 (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

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.

*1

Fuel Pump Control ECU

-

-

Powertrain > Engine > Active Test

Tester Display

Fuel Pump Single Phase Energization

Standard Voltage:

Tester Connection

GTS Operation

Specified Condition

O1-2 (FPU) - Body ground

U Phase

4.4 to 8.4 V*

O1-3 (FPV) - Body ground

U Phase

8 to 15.5 V

O1-4 (FPW) - Body ground

U Phase

8 to 15.5 V

O1-3 (FPV) - Body ground

V Phase

4.4 to 8.4 V*

O1-2 (FPU) - Body ground

V Phase

8 to 15.5 V

O1-4 (FPW) - Body ground

V Phase

8 to 15.5 V

O1-4 (FPW) - Body ground

W Phase

4.4 to 8.4 V*

O1-2 (FPU) - Body ground

W Phase

8 to 15.5 V

O1-3 (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 auxiliary battery voltage is between 11 and 14 V (not depleted).
NG

REPLACE FUEL PUMP CONTROL ECU

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

O1-2 (FPU) or O21-3 (BLPU) - Body ground and other terminals

Always

10 kΩ or higher

O1-3 (FPV) or O21-4 (BLPV) - Body ground and other terminals

Always

10 kΩ or higher

O1-4 (FPW) or O21-2 (BLPW) - Body ground and other terminals

Always

10 kΩ or higher

OK

REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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