Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001GCRF
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 09/2022]
Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): P056014; System Voltage (BATT) Circuit Short to Ground or Open; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

DTC

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: Comes on

MONITOR DESCRIPTION

If a period of time has elapsed with a low voltage at the BATT terminal of the hybrid vehicle control ECU, the hybrid vehicle control ECU will determine that a malfunction has occurred in the back-up power supply system, and it will store a DTC. The MIL will illuminate the next time the power switch on (IG).

MONITOR STRATEGY

Related DTCs

P0562 (INF P056014): System voltage range check (Low voltage)

Required sensors/components

Main: Back-up power source circuit

Sub: Hybrid vehicle control ECU

Frequency of operation

Continuous

Duration

TMC's intellectual property

MIL operation

Immediately

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not stored

TMC's intellectual property

Other conditions belong to TMC's intellectual property

-

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property

-

COMPONENT OPERATING RANGE

Auxiliary battery voltage

Between 9 and 14 V

CONFIRMATION DRIVING PATTERN

HINT:

  • 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 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): UTILITY

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

    Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): DTC CHECK / CLEAR

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG) and turn the Techstream 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 Techstream on.
  6. With power switch on (IG) and wait for 5 seconds or more. [*1]

    HINT:

    [*1] : Normal judgment procedure.

    The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

  7. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
  8. Check the DTC judgment result.

    HINT:

    • 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 the normal judgment procedure again.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

After turning the 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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PROCEDURE

1.

CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)

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

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OK:

The connectors are connected securely and there are no contact pressure problems.
NG

CONNECT SECURELY
OK

2.

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

(a) Turn the power switch off.

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

*a

Component with harness connected

(Hybrid Vehicle Control ECU)

-

-

Standard Voltage:

Tester Connection

Condition

Specified Condition

I3-27 (BATT) - I3-3 (E1)

Power switch off

11 to 14 V
OK

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NG

3.

CHECK FUSE (ECU-B NO. 2)

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

*1

Instrument Panel Junction Block Assembly

*2

ECU-B NO. 2 Fuse

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

ECU-B NO. 2 fuse

Always

Below 1 Ω

(c) Reinstall the ECU-B NO. 2 fuse.

NG

REPLACE FUSE (ECU-B NO. 2)
OK

4.

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

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

*1

Instrument Panel Junction Block Assembly

*2

ECU-B NO. 2 Fuse Holder

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

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (ECU-B NO. 2 fuse holder) - Auxiliary battery positive (+) cable

Power switch off

Below 1 Ω

1 (ECU-B NO. 2 fuse holder) - Body ground

Power switch off

10 kΩ or higher

(e) Reconnect the cable to the positive (+) auxiliary battery terminal.

(f) Reconnect the cable to the negative (-) auxiliary battery terminal.

(g) Reinstall the ECU-B NO. 2 fuse.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

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

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

(b) Disconnect the I3 hybrid vehicle control ECU connector.

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

*1

Instrument Panel Junction Block Assembly

*2

ECU-B NO. 2 Fuse Holder

*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 holder) - I3-27 (BATT)

Power switch off

Below 1 Ω

(d) Reconnect the I3 hybrid vehicle control ECU connector.

(e) Reinstall the ECU-B NO. 2 fuse.

OK

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NG

REPAIR OR REPLACE HARNESS OR CONNECTOR