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

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

MONITOR DESCRIPTION

The battery supplies electricity to the ECM even when the engine 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. When the engine is next started, the ECM illuminates the MIL and stores the DTC.

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

  • Open in back up power source circuit

  • Battery

  • Battery terminals

  • ECM

 Comes on DTC stored SAE: P0562

Tech Tips

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

MONITOR STRATEGY

Required Sensors/Components ECM
Frequency of Operation Continuous

TYPICAL MALFUNCTION THRESHOLDS

Both of the following conditions are met -
Battery voltage (BATT) Below 3.5 V
Electronic throttle actuator power supply voltage (+BM) Below 3.5 V

CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the engine switch on (IG) and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  4. Turn the engine switch off and wait for at least 30 seconds.

  5. Turn the engine switch on (IG) and turn the GTS on.

  6. Wait 5 seconds or more.

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

  8. 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.

  9. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

  10. Input the DTC: P056014.

  11. 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
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

WIRING DIAGRAM

A01HFYWE01
*a FL MAIN
*b EFI-MAIN NO. 1
*c Battery

CAUTION / NOTICE / HINT

Note

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

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 BATTERY


    1. Inspect that the battery is not depleted.

      Click here

      OK
      Battery is not depleted
      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 TERMINAL VOLTAGE (POWER SOURCE OF ECM)


    1. A01HEZLC03
      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A35-1 (BATT) - Body ground Always 11 to 14 V
      C20-48 (+BM) - 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 engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

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

    6. Turn the engine switch on (IG).

    7. Turn the GTS on.

    8. Wait 5 seconds or more.

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

    10. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTC P056014 is output A
      DTC is not output B

    A

    REPLACE ECM Click here

    B

    CHECK FOR INTERMITTENT PROBLEMS Click here