HYBRID CONTROL SYSTEM, Diagnostic DTC:P056014

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

DESCRIPTION

Auxiliary battery power is supplied to the BATT terminal of the hybrid vehicle control ECU in order to store DTCs and freeze frame data. Even if the power switch is turned off, back-up power is supplied.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P056014 System Voltage (BATT) Circuit Short to Ground or Open

Malfunction in the hybrid vehicle control ECU back-up power source circuit

(1 trip detection logic)

  • Wire harness or connector

  • Hybrid vehicle control ECU

  • Fuse

 Comes on

Master Warning Light:

Comes on

CONFIRMATION DRIVING PATTERN

Tech Tips

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Click here


  1. Connect the GTS to the DLC3.

  2. Turn the power 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 power switch off and wait for 2 minutes or more.

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

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

  7. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.

  8. Check the DTC judgment result.

    Tech Tips


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

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

    • If the judgment result shows INCOMPLETE or N/A, perform driving pattern again.

WIRING DIAGRAM

B004QQ2E02
*a BATT-MAIN
*b ECU-B NO.2
*c Auxiliary Battery
*d Hybrid Vehicle Control ECU

PROCEDURE


  1. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)


    1. Check the connector connections and contact pressure of the relevant terminals for the hybrid vehicle control ECU connectors.

      Click here

      B004P9FC01
      *A for LHD *B for RHD
      OK
      The connectors are connected securely and there are no contact pressure problems.
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT SECURELY

    OK

  2. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - ECU-B NO. 2 FUSE)


    1. Turn the power switch off.

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

      B004OOZC40
      *a

      Component with harness connected

      (Hybrid Vehicle Control ECU)

      		 - -
      Standard Voltage
      Tester Connection Condition Specified Condition
      F3-27 (BATT) - F3-3 (E1) Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    NG

  3. CHECK FUSE (ECU-B NO. 2)


    1. B004OIPC01
      *1 Instrument Panel Junction Block Assembly
      *2 ECU-B NO. 2 Fuse

      Remove the ECU-B NO. 2 fuse from the instrument panel junction block assembly.

    2. Check if there is an open circuit in the ECU-B NO. 2 fuse in the instrument panel junction block assembly.

      OK
      There is no open circuit in the ECU-B NO. 2 fuse.

    3. Install the ECU-B NO. 2 fuse.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FUSE (ECU-B NO. 2)

    OK

  4. CHECK HARNESS AND CONNECTOR (ECU-B NO. 2 FUSE - BATTERY TERMINAL)


    1. B004OJKC01
      *1 Instrument Panel Junction Block Assembly
      *2 ECU-B NO. 2 Fuse

      Remove the ECU-B NO. 2 fuse from the instrument panel junction block assembly .

    2. Disconnect the cable from the negative (-) auxiliary battery terminal.

    3. Disconnect the cable from the positive (+) auxiliary battery terminal.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - Auxiliary battery positive (+) cable Power switch off Below 1 Ω
      1 - Body ground Power switch off 10 kΩ or higher

    5. Connect the cable to the positive (+) auxiliary battery terminal.

    6. Connect the cable to the negative (-) auxiliary battery terminal.

    7. Install the ECU-B NO. 2 fuse.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (ECU-B NO. 2 FUSE - HYBRID VEHICLE CONTROL ECU)


    1. Remove the ECU-B NO. 2 fuse from the instrument panel junction block assembly .

    2. Disconnect the F3 hybrid vehicle control ECU connector.

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

      B004Q0XC02
      *1 Instrument Panel Junction Block Assembly *2 ECU-B NO. 2 Fuse
      *a

      Front view of wire harness connector

      (to Hybrid Vehicle Control ECU)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (ECU-B NO. 2 fuse terminal) - F3-27 (BATT) Power switch off Below 1 Ω

    4. Reconnect the F3 hybrid vehicle control ECU connector.

    5. Install the ECU-B NO. 2 fuse.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR