Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001N35B
Model Year Start: 2021 Model: Corolla Prod Date Range: [04/2020 - 09/2022]
Title: HYBRID / BATTERY CONTROL: HYBRID BATTERY SYSTEM (for LITHIUM-ION BATTERY with P610): U115087; Lost Communication with Hybrid Powertrain Control Module (Hybrid/EV Battery Local Bus) Missing Message; 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]

DTC

U115087

Lost Communication with Hybrid Powertrain Control Module (Hybrid/EV Battery Local Bus) Missing Message

DESCRIPTION

The battery ECU assembly transmits and receives signals via CAN communication to and from the hybrid vehicle control ECU.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

U115087

Lost Communication with Hybrid Powertrain Control Module (Hybrid/EV Battery Local Bus) Missing Message

The battery ECU assembly does not receive any signals from the hybrid vehicle control ECU for 1 second or more.

(1 trip detection logic)
  • Battery ECU assembly
  • Hybrid vehicle control ECU
  • Wire harness or connector

Comes on

Master Warning:

Comes on

MONITOR DESCRIPTION

If the battery ECU assembly cannot communicate with the hybrid vehicle control ECU assembly via CAN communication, it will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

U1150 (INF U115087): Lost communication with hybrid control module (battery bus)

Required sensors/components

Battery ECU assembly

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

Battery ECU assembly

DTC U1150 (INF U115087) is not detected

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 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID BATTERY SYSTEM (for LITHIUM-ION BATTERY with P610): UTILITY

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

    Click here 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID BATTERY SYSTEM (for LITHIUM-ION BATTERY with P610): 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 2 minutes 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 / HV Battery / 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

CAUTION:

  • Before the following operations are conducted, take precautions to prevent electric shock by turning the power switch off, wearing insulated gloves, and removing the service plug grip from HV battery.
    • Inspecting the high-voltage system
    • Disconnecting the low voltage connector of the inverter with converter assembly
    • Disconnecting the low voltage connector of the HV battery
  • To prevent electric shock, make sure to remove the service plug grip to cut off the high voltage circuit before servicing the vehicle.
  • After removing the service plug grip from the HV battery, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
  • After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.

    Click here 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID BATTERY SYSTEM (for LITHIUM-ION BATTERY with P610): PRECAUTION

    HINT:

    Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

    *a

    Without waiting for 10 minutes

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 2021 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [04/2020 - 09/2022]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION

PROCEDURE

1.

CHECK DTC OUTPUT (HYBRID CONTROL)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

(d) Check and record any Hybrid Control DTCs and freeze frame data. Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes

Result

Proceed to

DTCs related to Hybrid Control are not output.

A

DTCs related to Hybrid Control are output.

B

(e) Turn the power switch off.

B

GO TO DTC CHART (HYBRID CONTROL SYSTEM)

A

2.

CHECK HYBRID VEHICLE CONTROL ECU (VOLTAGE)

(a) Turn the power switch on (IG).

(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

A57-11 (+B1) - Body ground

Power switch on (IG)

11 to 14 V

I3-1 (+B2) - Body ground

Power switch on (IG)

11 to 14 V

(c) Turn the power switch off.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY ECU ASSEMBLY POWER SOURCE CIRCUIT)
OK

3.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - BATTERY ECU ASSEMBLY)

CAUTION:

Be sure to wear insulated gloves and protective goggles.

(a) Check that the service plug grip is not installed.

NOTICE:

After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Disconnect the I2 hybrid vehicle control ECU connector.

NOTICE:

  • Before disconnecting the connector, check that it is not loose or disconnected.
  • Check that each connector between the hybrid vehicle control ECU and battery ECU assembly is not loose or disconnected.

(c) Remove the No. 1 HV battery protector.

Click here 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; HYBRID / BATTERY CONTROL: BATTERY ECU (for LITHIUM-ION BATTERY): REMOVAL+

(d) Disconnect the z28 battery ECU assembly connector.

NOTICE:

  • Before disconnecting the connector, check that it is not loose or disconnected.
  • Check the terminals of the connector for deformation and corrosion.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

z28-2 (CA1H) - I2-9 (CA4H)

Power switch off

Below 1 Ω

z28-3 (CA1L) - I2-22 (CA4L)

Power switch off

Below 1 Ω

I2-9 (CA4H) - Other terminals and body ground

Power switch off

10 kΩ or higher

I2-22 (CA4L) - Other terminals and body ground

Power switch off

10 kΩ or higher

*a

Rear view of wire harness connector

(to Battery ECU Assembly)

*b

Front view of wire harness connector

(to Hybrid Vehicle Control ECU)

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

(g) Turn the power switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

z28-2 (CA1H) - Body ground

Power switch on (IG)

Below 1 V

z28-3 (CA1L) - Body ground

Power switch on (IG)

Below 1 V

NOTICE:

  • Turning the power switch on (IG) with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
  • If the power switch is turned on (IG) with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.

(i) Turn the power switch off.

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

(k) Reconnect the z28 battery ECU assembly connector.

(l) Install the No. 1 HV battery protector.

(m) Reconnect the I2 hybrid vehicle control ECU connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK BATTERY ECU ASSEMBLY

CAUTION:

Be sure to wear insulated gloves and protective goggles.

(a) Check that the service plug grip is not installed.

NOTICE:

After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Remove the No. 1 HV battery protector.

Click here 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; HYBRID / BATTERY CONTROL: BATTERY ECU (for LITHIUM-ION BATTERY): REMOVAL+

(c) Disconnect the z28 battery ECU assembly connector.

NOTICE:

Before disconnecting the connector, check that it is not loose or disconnected.

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

(e) Turn the power switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

z28-2 (CA1H) - z28-4 (GND)

Power switch on (IG)

2.5 to 3.5 V

z28-3 (CA1L) - z28-4 (GND)

Power switch on (IG)

1.5 to 2.5 V

NOTICE:

  • Turning the power switch on (IG) with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.
  • If the power switch is turned on (IG) with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.

*a

Rear view of wire harness connector

(to Battery ECU Assembly)

(g) Turn the power switch off.

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

z28-2 (CA1H) - z28-3 (CA1L)

Power switch off

108 to 132 Ω

HINT:

The resistance will be 2.0 kΩ or less if there is an internal short in the battery ECU assembly.

(j) Reconnect the z28 battery ECU assembly connector.

(k) Install the No. 1 HV battery protector.

OK

REPLACE BATTERY ECU ASSEMBLY

NG

REPLACE HYBRID VEHICLE CONTROL ECU