Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001OBDQ
Model Year Start: 2020 Model: RAV4 HV Prod Date Range: [06/2020 -           ]
Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY): U011187; Lost Communication with Hybrid/EV Battery Energy Control Module "A" Missing Message; 2020 - 2024 MY RAV4 HV [06/2020 -        ]

DTC

U011187

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

DESCRIPTION

The hybrid vehicle control ECU assembly 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

U011187

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

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

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

Comes on

Master Warning:

Comes on

MONITOR DESCRIPTION

If the hybrid vehicle control ECU assembly 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 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

Hybrid vehicle control ECU assembly

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 2020 - 2024 MY RAV4 HV [06/2020 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY): UTILITY

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

    Click here 2020 - 2022 MY RAV4 HV [06/2020 - 10/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY): DTC CHECK / CLEAR 2023 - 2024 MY RAV4 HV [10/2022 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY): DTC CHECK / CLEAR

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON and turn the Techstream 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 Techstream 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:

  • Before the following operations are conducted, take precautions to prevent electric shock by turning the ignition 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 2020 - 2024 MY RAV4 HV [06/2020 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY): 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 ignition 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 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION

  • 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.
  • As interlock circuit DTCs or other DTCs may be stored when the ignition switch is turned to ON in the following procedure, make sure to clear the DTCs after inspection.

PROCEDURE

1.

CHECK DTC OUTPUT (HV BATTERY)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Enter the following menus: Powertrain / HV Battery / Trouble Codes.

(d) Check and record any HV system DTCs and freeze frame data. Check for DTCs.

Powertrain > HV Battery > Trouble Codes

Result

Proceed to

DTCs related to HV Battery are not output.

A

DTCs related to HV Battery are output.

B

(e) Turn the ignition switch off.

B

GO TO DTC CHART (HV 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) Remove the No. 1 HV battery hose.

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(c) Disconnect the z26 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) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

z26-1(AM) - z26-27(GND)

Ignition switch off

11 to 14 V

z26-13(IGCT) - z26-27(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)

*a

Front view of wire harness connector

(Battery ECU Assembly)

(f) Turn the ignition switch off.

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

(h) Reconnect the z26 battery ECU assembly connector.

(i) Install the No. 1 HV battery hose.

NG

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

3.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - 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 A31 hybrid vehicle control ECU assembly connector.

NOTICE:

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

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

Click here 2020 MY RAV4 HV [06/2020 - 08/2020]; HYBRID / BATTERY CONTROL: BATTERY ECU (for LITHIUM-ION BATTERY): REMOVAL+ 2021 MY RAV4 HV [08/2020 - 12/2021]; HYBRID / BATTERY CONTROL: BATTERY ECU (for LITHIUM-ION BATTERY): REMOVAL+ 2022 MY RAV4 HV [12/2021 - 10/2022]; HYBRID / BATTERY CONTROL: BATTERY ECU (for LITHIUM-ION BATTERY): REMOVAL+ 2023 MY RAV4 HV [10/2022 - 10/2023]; HYBRID / BATTERY CONTROL: BATTERY ECU (for LITHIUM-ION BATTERY): REMOVAL+ 2024 MY RAV4 HV [10/2023 -        ]; HYBRID / BATTERY CONTROL: BATTERY ECU (for LITHIUM-ION BATTERY): REMOVAL+

(d) Disconnect the z26 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

z26-25(CA1H) - A31-9(CA4H)

Ignition switch off

Below 1 Ω

z26-26(CA1L) - A31-22(CA4L)

Ignition switch off

Below 1 Ω

A31-9 (CA4H) - Other terminals and body ground

Ignition switch off

10 kΩ or higher

A31-22(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 assembly is not loose or disconnected and its terminals are not deformed or corroded.

*a

Front view of wire harness connector

(to Battery ECU Assembly)

*b

Front view of wire harness connector

(to Hybrid Vehicle Control ECU assembly)

(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

z26-25 (CA1H) - Body ground

Ignition switch ON

Below 1 V

z26-26 (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 z26 battery ECU assembly connector.

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

(m) Reconnect the A31 hybrid vehicle control ECU assembly connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK HYBRID VEHICLE CONTROL 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) Remove the No. 1 HV battery hose.

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(c) Disconnect the z26 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 ignition switch to ON.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

z26-25(CA1H) - z26-27(GND)

Ignition switch ON

2.5 to 3.5 V

z26-26(CA1L) - z26-27(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.

*a

Front view of wire harness connector

(to Battery ECU Assembly)

(g) Turn the ignition 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

z26-25(CA1H) - z26-26(CA1L)

Ignition switch off

108 to 132 Ω

(j) Reconnect the z26 battery ECU assembly connector.

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

OK

REPLACE BATTERY ECU ASSEMBLY 2020 MY RAV4 HV [06/2020 - 08/2020]; HYBRID / BATTERY CONTROL: BATTERY ECU (for LITHIUM-ION BATTERY): REMOVAL 2021 MY RAV4 HV [08/2020 - 12/2021]; HYBRID / BATTERY CONTROL: BATTERY ECU (for LITHIUM-ION BATTERY): REMOVAL 2022 MY RAV4 HV [12/2021 - 10/2022]; HYBRID / BATTERY CONTROL: BATTERY ECU (for LITHIUM-ION BATTERY): REMOVAL 2023 MY RAV4 HV [10/2022 - 10/2023]; HYBRID / BATTERY CONTROL: BATTERY ECU (for LITHIUM-ION BATTERY): REMOVAL 2024 MY RAV4 HV [10/2023 -        ]; HYBRID / BATTERY CONTROL: BATTERY ECU (for LITHIUM-ION BATTERY): REMOVAL

NG

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