СИСТЕМА БЕССТУПЕНЧАТОЙ ТРАНСМИССИИ (для моделей с 8NR-FTS), Diagnostic DTC:P056014

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

DESCRIPTION

The battery supplies electricity to the ECM even when the ignition switch is off. This power allows the ECM to store data such as DTC history, freeze frame data and fuel trim values. If the 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 next time the engine is started, 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

1. Diagnosis Condition 2. Malfunction Status 3. Malfunction Time 4. Other


  1. Always

  2. Open in ECM back up power source circuit

  3. 3 seconds

  4. 1-trip detection logic

  • Open or short in back up power source circuit

  • Battery

  • Battery terminals

  • ECM

 Comes on DTC stored

SAE Code:

P0562

Tech Tips

If DTC P056014 is stored, the ECM will not store other DTCs or the data stored in the ECM will be partially cleared.

WIRING DIAGRAM

A01T92FE05
*a FL MAIN
*b EFI-MAIN NO. 2
*c Battery

CAUTION / NOTICE / HINT

Note


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

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

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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.

  • After performing repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


    1. Turn the ignition switch to ON and wait for 3 seconds or more.

    2. Check for DTCs again.

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PROCEDURE


  1. INSPECT BATTERY


    1. Inspect the battery.

      Click here

      OK
      Battery voltage is between 11 and 14 V.
      Result
      Proceed to
      OK
      NG

    NG

    CHARGE OR REPLACE BATTERY

    OK

  2. CHECK BATTERY TERMINAL


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

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

    NG

    REPAIR OR REPLACE BATTERY TERMINAL

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE OF ECM)


    1. Disconnect the A173 ECM connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A173-1 (BATT) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - ECM)

    OK

  4. CHECK WHETHER DTC OUTPUT RECURS (DTC P056014)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Transmission / Trouble Codes.

    5. Clear the DTCs.


      Powertrain > Transmission > Clear DTCs

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

    7. Turn the ignition switch to ON.

    8. Turn the GTS on.

    9. Wait for 3 seconds or more.

    10. Enter the following menus: Powertrain / Transmission / Trouble Codes.

    11. Read the DTCs.


      Powertrain > Transmission > Trouble Codes
      Result
      Result Proceed to
      DTC P056014 is output A
      DTCs are not output B

    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

  5. REPLACE ECM


    1. Replace the ECM.

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      Result
      Proceed to
      NEXT

    NEXT

    PERFORM INITIALIZATION Click here