SFI SYSTEM(w/o Canister Pump Module), Diagnostic DTC:P12D41D

DTC Code DTC Name
P12D41D Fuel Pump Control Circuit Current Out of Range

DESCRIPTION

Refer to DTC P062712.

Click here

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P12D41D Fuel Pump Control Circuit Current Out of Range When the fuel pump control ECU operation duty ratio is 3 to 65%, overcurrent in the fuel pump circuit is detected for 3 seconds or more (1 trip detection logic).

  • Short in fuel pump control ECU circuit

  • Fuel pump (for low pressure side)

  • Fuel pump (for low pressure side) locked

  • Foreign matter in the fuel

  • Fuel pump control ECU

 Does not come on DTC stored SAE Code: P12D4
Related Data List
DTC No. Data List
P12D41D 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 overcurrent 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.

B006Y0IE02

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. Start the engine.

  7. Wait 10 seconds or more.

  8. Turn the GTS on.

  9. Enter the following menus: Powertrain / Engine / Trouble Codes.

  10. Read the pending DTCs.

    Tech Tips


    • 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: P12D41D.

  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

    Tech Tips


    • 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 2000 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

Tech Tips

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

    B006Y5HC01
    *1 Fuel Pump Control ECU - -

    1. Remove the fuel pump control ECU.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R17-2 (FPU) - R18-3 (GND) Always 2 kΩ or higher
      R17-3 (FPV) - R18-3 (GND) Always 2 kΩ or higher
      R17-4 (FPW) - R18-3 (GND) Always 2 kΩ or higher

      Tech Tips

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

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FUEL PUMP CONTROL ECU Click here

    OK

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

    B00711EC01
    *1 Fuel Pump Control ECU - -

    1. Disconnect the R17 fuel pump control ECU connector.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

    5. Enter the following menus: Powertrain / Engine / Active Test / Fuel Pump Single Phase Energization.


      Powertrain > Engine > Active Test
      Tester Display
      Fuel Pump Single Phase Energization

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

      Standard Voltage
      Tester Connection GTS Operation Specified Condition
      R17-2 (FPU) - Body ground U Phase 4.4 to 8.4 V*
      R17-3 (FPV) - Body ground 8 to 15.5 V
      R17-4 (FPW) - Body ground 8 to 15.5 V
      R17-3 (FPV) - Body ground V Phase 4.4 to 8.4 V*
      R17-2 (FPU) - Body ground 8 to 15.5 V
      R17-4 (FPW) - Body ground 8 to 15.5 V
      R17-4 (FPW) - Body ground W Phase 4.4 to 8.4 V*
      R17-2 (FPU) - Body ground 8 to 15.5 V
      R17-3 (FPV) - Body ground 8 to 15.5 V

      Tech Tips


      • *: 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).

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FUEL PUMP CONTROL ECU Click here

    OK

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


    1. Disconnect the fuel pump control ECU connector.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R17-2 (FPU) or R43-3 (BLPU) - Other terminals Always 10 kΩ or higher
      R17-3 (FPV) or R43-4 (BLPV) - Other terminals Always 10 kΩ or higher
      R17-4 (FPW) or R43-2 (BLPW) - Other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE)


    1. Replace the fuel pump (for low pressure side).

      Click here

      Tech Tips

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

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    5. Turn the ignition switch off and wait for at least 30 seconds.

      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK WHETHER DTC OUTPUT RECURS (DTC P12D41D)


    1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    2. Enter the following menus: Powertrain / Engine / Trouble Codes.

    3. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      OK
      DTCs are not output.
      Result
      Proceed to
      NEXT

    NEXT

    END