Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM1000000026PVV
Model Year Start: 2023 Model: Corolla HV Prod Date Range: [09/2022 -           ]
Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): U011187; Lost Communication with Hybrid/EV Battery Energy Control Module "A" Missing Message; 2023 - 2025 MY Corolla HV [09/2022 -        ]

DTC

U011187

Lost Communication with Hybrid/EV Battery Energy Control Module "A" Missing Message

DESCRIPTION

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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

Note

U011187

Lost Communication with Hybrid/EV Battery Energy Control Module "A" Missing Message

The hybrid vehicle control ECU cannot receive signals from the battery ECU assembly

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

Comes on

Master Warning:

Comes on

SAE Code:

U0111

MONITOR DESCRIPTION

If the hybrid vehicle control ECU detects a problem with CAN communication with the ECU, it will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

U0111 (INF U011187): Lost communication with BECM (Battery bus) verify communication

Required sensors/components

Main: Battery ECU assembly

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

Hybrid vehicle control ECU

DTC U0111 (INF U011187) 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 2023 - 2025 MY Corolla HV [09/2022 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): UTILITY

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

    Click here 2023 - 2025 MY Corolla HV [09/2022 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): DTC CHECK / CLEAR

  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON and turn the GTS on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the ignition switch off and wait for 2 minutes or more.
  5. Turn the ignition switch to ON and turn the GTS on.
  6. Turn the ignition switch to ON (READY) 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 / 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, perform the normal judgment procedure again.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

Refer to the precautions before inspecting high voltage circuit.

Click here 2023 - 2025 MY Corolla HV [09/2022 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): PRECAUTION

NOTICE:

  • After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.

    Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; SETUP: WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL: BEFORE DISCONNECTING BATTERY

  • When disconnecting and reconnecting the auxiliary battery

    HINT:

    When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

    Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; SETUP: WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL: AUTOMATIC LEARNING CHART 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; SETUP: WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL: AUTOMATIC LEARNING CHART

PROCEDURE

1.

CHECK DTC OUTPUT (HV BATTERY)

(a) Check and record any HV Battery DTCs and freeze frame data. Check for DTCs.

Powertrain > HV Battery > Trouble Codes

Result

Proceed to

DTCs related to Hybrid Battery System are not output.

A

DTCs related to Hybrid Battery System are output.

B

(b) Turn the ignition switch off.

B

GO TO DTC CHART (HYBRID BATTERY SYSTEM)

A

2.

CHECK BATTERY ECU ASSEMBLY (IGCT VOLTAGE)

CAUTION:

Be sure to wear insulated gloves.

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

NOTICE:

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

(b) Disconnect the 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.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O192-24 (AM) - O192-10 (GND)

Ignition switch off

11 to 14 V

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

(e) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O192-12 (IGCT) - O192-10 (GND)

Ignition switch ON

11 to 14 V

NOTICE:

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

HINT:

As there might be an intermittent malfunction in the battery ECU assembly power source circuit, inspect the following even if the measured voltage is as specified:

  • Installation condition of fuse(s) (before removing fuse(s)) (IGCT circuit)
  • Fuse condition (before and after removing fuse(s)) (IGCT circuit)
  • Connection condition of connectors (IGCT circuit)
  • Wire harness condition (IGCT circuit)
  • Wire harness condition (GND circuit)

(g) Turn the ignition switch off.

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

(i) Reconnect the battery ECU assembly connector.

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.

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

NOTICE:

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

(b) Disconnect the 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) Disconnect the 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.

(d) Disconnect the inverter with converter 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

O192-22 (CA1H) - I3-9 (CA4H)

Ignition switch off

Below 1 Ω

O192-21 (CA1L) - I3-22 (CA4L)

Ignition switch off

Below 1 Ω

I3-9 (CA4H) - Other terminals and body ground

Ignition switch off

10 kΩ or higher

I3-22 (CA4L) - Other terminals and body ground

Ignition switch off

10 kΩ or higher

NOTICE:

Make sure that each connector between the battery ECU assembly and hybrid vehicle control ECU is not loose or disconnected and its terminals are not deformed or corroded.

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

(g) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O192-22 (CA1H) - Body ground

Ignition switch ON

Below 1 V

O192-21 (CA1L) - Body ground

Ignition switch ON

Below 1 V

NOTICE:

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

(i) Turn the ignition switch off.

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

(k) Reconnect the inverter with converter assembly connector.

(l) Reconnect the battery ECU assembly connector.

(m) Reconnect the hybrid vehicle control ECU connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK HYBRID VEHICLE CONTROL ECU

CAUTION:

Be sure to wear insulated gloves.

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

NOTICE:

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

(b) Disconnect the 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.

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

(d) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O192-22 (CA1H) - O192-10 (GND)

Ignition switch ON

2.5 to 3.5 V

O192-21 (CA1L) - O192-10 (GND)

Ignition switch ON

1.5 to 2.5 V

NOTICE:

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

(f) Turn the ignition switch off.

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O192-22 (CA1H) - O192-21 (CA1L)

Ignition switch off

108 to 132 Ω

(i) Reconnect the battery ECU assembly connector.

OK

REPLACE BATTERY ECU ASSEMBLY

NG

REPLACE HYBRID VEHICLE CONTROL ECU