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SFI SYSTEM(w/o Canister Pump Module), Diagnostic DTC:P056014

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DTC Code DTC Name
P056014 System Voltage Circuit Short to Ground or Open
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MONITOR DESCRIPTION

The auxiliary battery supplies electricity to the ECM even when the power switch is off. This power allows the ECM to store data such as DTC history, freeze frame data and fuel trim values. If the auxiliary battery voltage falls below a minimum level, the memory is cleared and the ECM determines that there is a malfunction in the power supply circuit. The ECM will illuminate the MIL and store this DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P056014 System Voltage Circuit Short to Ground or Open An open or short in the ECM backup power source circuit (1 trip detection logic).

  • Open or short in back up power source circuit

  • Auxiliary battery

  • Auxiliary battery terminals

  • ECM

 Comes on DTC stored SAE: P0562
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MONITOR STRATEGY

Required Sensors/Components ECM
Frequency of Operation Continuous
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TYPICAL MALFUNCTION THRESHOLDS

Both of the following conditions are met -
Continuous auxiliary battery voltage (BATT) Less than 3.5 V
Electronic throttle actuator power supply voltage (+BM) Less than 3.5 V
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CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the power switch on (IG).

  3. Turn the GTS 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 GTS on.

  8. With power switch on (IG) and wait for 5 seconds or more.

  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: P056014.

  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 shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system is malfunctioning.

Table 1. *a EFI-MAIN NO. 1 *b Auxiliary Battery
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • Vehicle Control History may be stored in the hybrid vehicle control ECU 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.

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

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  • If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU, 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.

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  • After turning power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

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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. Click here

    INSPECT AUXILIARY BATTERY


    1. Inspect the auxiliary battery.

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      OK
      Auxiliary battery is not depleted
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      CHARGE OR REPLACE AUXILIARY BATTERY

  2. Click here

    CHECK AUXILIARY BATTERY TERMINAL


    1. Check that the auxiliary battery terminals are not loose or corroded.

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      OK
      Auxiliary battery terminals are not loose or corroded.
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE AUXILIARY BATTERY TERMINAL

  3. Click here

    CHECK TERMINAL VOLTAGE (POWER SOURCE OF ECM)


    1. Disconnect the ECM connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A56-1 (BATT) - Body ground Always 11 to 16 V
      A56-8 (+BM) - Body ground Always 11 to 16 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - ECM)

  4. Click here

    CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      1. Powertrain > Engine > Clear DTCs


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

      Result
      Proceed to
      NEXT

  5. Click here

    CHECK WHETHER DTC OUTPUT RECURS (DTC P056014)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Wait 5 seconds or more.

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

    6. Read the DTCs.


      1. Powertrain > Engine > Trouble Codes


      Result
      Result Proceed to
      DTCs are not output A
      DTC P056014 is output B