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SFI SYSTEM(w/o Canister Pump Module), Diagnostic DTC:P12D501

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DTC Code DTC Name
P12D501 Fuel Pump Control General Electrical Failure
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DESCRIPTION

Refer to DTC P062712.

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DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory 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

 Does not come on DTC stored SAE Code: P12D5
Table 1. Related Data List
DTC No. Data List
P12D501 Fuel Pump Control Duty Ratio
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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%, the voltage to the fuel pump control ECU is more than a certain value 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.

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MONITOR STRATEGY

Required Sensors/Components Fuel pump control ECU
Frequency of Operation Continuous
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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.

    Tip:

    • 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
    Tip:

    • 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.

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WIRING DIAGRAM

Refer to DTC P062712.

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CAUTION / NOTICE / HINT

Tip:

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.

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PROCEDURE


  1. *1 Fuel Pump Control ECU - -
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    INSPECT FUEL PUMP CONTROL ECU


    1. Remove the fuel pump control ECU.

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    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
      Tip:

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

      Result
      Proceed to
      OK
      NG

  2. *1 Fuel Pump Control ECU - -
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    PERFORM ACTIVE TEST USING GTS (FUEL PUMP SINGLE PHASE ENERGIZATION)


    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.


      1. 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
      Tip:

      • *: 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

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    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) - Body ground and other terminals Always 10 kΩ or higher
      R17-3 (FPV) or R43-4 (BLPV) - Body ground and other terminals Always 10 kΩ or higher
      R17-4 (FPW) or R43-2 (BLPW) - Body ground and other terminals Always 10 kΩ or higher
      Tip:

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

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      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE)Click here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR