Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001A0FC
Model Year Start: 2019 Model: Avalon HV Prod Date Range: [04/2018 - 08/2020]
Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): P056014; System Voltage (BATT) Circuit Short to Ground or Open; 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]

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 Light:

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 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; 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 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; 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.

Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION

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.

Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: ELECTRONIC CIRCUIT INSPECTION PROCEDURE

OK:

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

CONNECT SECURELY
OK

2.

CHECK HARNESS AND CONNECTOR (POWER SOURCE OF HYBRID VEHICLE CONTROL ECU)

(a) Turn the power switch off.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

G47-3 (BATT) - G46-6 (E1)

Power switch off

11 to 14 V

*a

Component with harness connected

(Hybrid Vehicle Control ECU)
OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

3.

CHECK FUSE (ECU-B NO. 4)

(a) Remove the ECU-B NO. 4 fuse from the fusible link block assembly.

*1

Fusible Link Block Assembly

*2

ECU-B NO. 4 Fuse

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

ECU-B NO. 4 fuse

Always

Below 1 Ω

(c) Reinstall the ECU-B NO. 4 fuse.

NG

REPLACE FUSE (ECU-B NO. 4)
OK

4.

INSPECT FUSIBLE LINK BLOCK ASSEMBLY

(a) Disconnect the cable to the negative (-) auxiliary battery terminal.

(b) Disconnect the cable to the positive (+) auxiliary battery terminal.

(c) Remove the fusible link block assembly.

*1

Fusible Link Block Assembly

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A-1 (Positive (+) auxiliary battery terminal) - 7C-2

Always

Below 1 Ω

(e) Reinstall the fusible link block assembly.

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

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

NG

REPLACE FUSIBLE LINK BLOCK ASSEMBLY
OK

5.

CHECK HARNESS AND CONNECTOR (FUSIBLE LINK BLOCK ASSEMBLY - HYBRID VEHICLE CONTROL ECU)

(a) Remove the ECU-B NO. 4 fuse from the fusible link block assembly.

(b) Disconnect the G47 hybrid vehicle control ECU connector.

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

*1

Fusible Link Block Assembly

*2

ECU-B NO. 4 Fuse Holder

*a

Rear view of wire harness connector

(to Hybrid Vehicle Control ECU)

-

-

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

2 (ECU-B NO. 4 fuse holder) - G47-3 (BATT)

Power switch off

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

2 (ECU-B NO. 4 fuse) or G47-3 (BATT) - Body ground and other terminals

Power switch off

10 kΩ or higher

(d) Reconnect the G47 hybrid vehicle control ECU connector.

(e) Reinstall the ECU-B NO. 4 fuse.

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR