Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001OBBG
Model Year Start: 2020 Model: RAV4 HV Prod Date Range: [06/2020 -           ]
Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY): P312387; Lost Communication with Drive Motor Control Module "A" from Hybrid/EV Control Module Missing Message; 2020 - 2024 MY RAV4 HV [06/2020 -        ]

DTC

P312387

Lost Communication with Drive Motor Control Module "A" from Hybrid/EV Control Module Missing Message

DESCRIPTION

Refer to the description for P0D2D16.

Click here 2020 - 2024 MY RAV4 HV [06/2020 -        ]; HYBRID / BATTERY CONTROL: MOTOR GENERATOR CONTROL SYSTEM (for LITHIUM-ION BATTERY): P0D2D16,P0D2D17,P0D2D1F; Drive Motor "A" Inverter Voltage Sensor(VH) Circuit Voltage Below Threshold+

The MG ECU, which is built into in the inverter with converter assembly, controls motor (MG2) based on commands from the hybrid vehicle control ECU assembly.

The hybrid vehicle control ECU assembly monitors communication data and detects malfunctions.

A communication error between the MG ECU and the hybrid vehicle control ECU assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

P312387

Lost Communication with Drive Motor Control Module "A" from Hybrid/EV Control Module Missing Message

Error in reception from inverter with converter assembly (MG ECU) via serial communication (out of communication standard)

(1 trip detection logic)

  • Wire harness or connector
  • Inverter with converter assembly
  • Hybrid vehicle control ECU assembly
  • PCU fuse

Comes on

Master Warning:

Comes on

MONITOR DESCRIPTION

The hybrid vehicle control ECU assembly monitors communication data and detects malfunctions, it will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs

P3123 (INF P312387): Lost Communication With Drive Motor "A" Control Module Verify communication

Required sensors / components

Main: Hybrid vehicle control ECU assembly

Sub: Inverter with converter 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 P3123 (INF P312387) 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. With ignition switch ON 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

Refer to the wiring diagram for the inverter low-voltage circuit.

Click here 2020 - 2024 MY RAV4 HV [06/2020 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY): Inverter Low-voltage Circuit+

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

    *a

    Without waiting for 10 minutes

    HINT:

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

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

PROCEDURE

1.

INSPECT FUSE (PCU)

(a) Remove the PCU fuse from the No. 3 relay block and junction block assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

PCU fuse

Always

Below 1 Ω

*1

No. 3 Relay Block and Junction Block Assembly

*2

PCU Fuse

(c) Install the PCU fuse.

NG

GO TO STEP 9

OK

2.

CLEAR DTC

Click here 2020 - 2024 MY RAV4 HV [06/2020 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY): P06881F; ECM/PCM Power Relay Sense Circuit Intermittent+

NEXT

3.

CHECK DIAGNOSIS RELATED INFORMATION AND DTC OUTPUT (HYBRID CONTROL)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON and wait for 2 minutes or more.

(c) Enter the following menus: Powertrain / Hybrid Control / Utility / Diagnosis Related Information.

Powertrain > Hybrid Control > Utility

Tester Display

Diagnosis Related Information

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

Powertrain > Hybrid Control > Trouble Codes

(e) Check for DTCs.

Result

Proceed to

P312387 is listed in Diagnosis Related Information or DTC P312387 is output.

A

P312387 is not listed in Diagnosis Information and DTC P312387 is not output.

B

(f) Turn the ignition switch off.

B

CHECK FOR INTERMITTENT PROBLEMS

A

4.

CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU ASSEMBLY CONNECTOR)

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

Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; 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

5.

CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)

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) Check the connection condition of the low voltage connectors of the inverter with converter assembly and the contact pressure of each terminal. Check the terminals for deformation, and the connector for water and foreign matter.

Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: ELECTRONIC CIRCUIT INSPECTION PROCEDURE

NOTICE:

Before disconnecting the connector, confirm that it is properly connected by checking that the claws of the lock levers are engaged and that the connector cannot be pulled off.

OK:

- The connector is connected securely.

- The terminals are not deformed and are connected securely.

- No water or foreign matter in the connector.

Result:

Result

Proceed to

OK

A

NG (The connector is not connected securely.)

B

NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.)

C

HINT:

When connecting the connector, connect it with the lock levers raised. Rotate each lock lever downward and make sure that the connector is securely connected. When a lock lever is fully lowered, a click will be heard as its claw engages. After the click is heard, pull up on the connector to confirm that it is securely connected.

B

CONNECT SECURELY

C

REPAIR OR REPLACE HARNESS OR CONNECTOR

A

6.

CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY POWER SOURCE CIRCUIT)

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 A87 inverter with converter assembly connector.

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A87-9 (GND1) - Body ground

Ignition switch off

Below 1 Ω

A87-8 (GND2) - Body ground

Ignition switch off

Below 1 Ω

*a

Front view of wire harness connector

(to Inverter with Converter Assembly)

(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

A87-36 (+B) - Body ground

Ignition switch ON

11 to 14 V

A87-35 (+B2) - Body ground

Ignition switch ON

11 to 14 V

NOTICE:

Turning the ignition switch to ON with the inverter with converter assembly disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

(g) Turn the ignition switch off.

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

(i) Reconnect the A87 inverter with converter assembly connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - 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) Disconnect the A87 inverter with converter assembly connector.

(c) Disconnect the A29 hybrid vehicle control ECU assembly connector.

(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

A29-14 (HMCL) - Body ground

Ignition switch ON

Below 1 V

A29-4 (HMCH) - Body ground

Ignition switch ON

Below 1 V

NOTICE:

Turning the ignition switch to ON with the hybrid vehicle control ECU assembly connector and the inverter with converter assembly disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

*a

Front view of wire harness connector

(to Inverter with Converter Assembly)

*b

Front view of wire harness connector

(to Hybrid Vehicle Control 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 (Check for Open):

Tester Connection

Condition

Specified Condition

A87-4 (HMCL) - A29-14 (HMCL)

Ignition switch off

Below 1 Ω

A87-3 (HMCH) - A29-4 (HMCH)

Ignition switch off

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

A87-4 (HMCL) or A29-14 (HMCL) - Body ground and other terminals

Ignition switch off

10 kΩ or higher

A87-3 (HMCH) or A29-4 (HMCH) - Body ground and other terminals

Ignition switch off

10 kΩ or higher

HINT:

As there might be an intermittent malfunction, inspect the following items even if the measured resistance is as specified.

Check that each connector between the inverter with converter assembly and hybrid vehicle control ECU assembly is not loose or disconnected.

(j) Reconnect the A29 hybrid vehicle control ECU assembly connector.

(k) Reconnect the A87 inverter with converter assembly connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

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) Disconnect the A87 inverter with converter assembly connector.

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

*a

Component with harness connected

(Hybrid Vehicle Control ECU Assembly)

-

-

Standard Resistance:

Tester Connection

Condition

Specified Condition

A29-14 (HMCL) - A29-4 (HMCH)

Ignition switch off

110 to 130 Ω

(d) Reconnect the A87 inverter with converter assembly connector.

OK

REPLACE INVERTER WITH CONVERTER ASSEMBLY 2020 MY RAV4 HV [06/2020 - 08/2020]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER (for AWD): REMOVAL 2021 MY RAV4 HV [08/2020 - 12/2021]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER (for AWD): REMOVAL 2022 MY RAV4 HV [12/2021 - 10/2022]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER (for AWD): REMOVAL 2023 MY RAV4 HV [10/2022 - 10/2023]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER (for AWD): REMOVAL 2024 MY RAV4 HV [10/2023 -        ]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER (for AWD): REMOVAL

NG

REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY 2020 MY RAV4 HV [10/2019 - 08/2020]; HYBRID / BATTERY CONTROL: HYBRID VEHICLE CONTROL ECU: REMOVAL 2021 MY RAV4 HV [08/2020 - 12/2021]; HYBRID / BATTERY CONTROL: HYBRID VEHICLE CONTROL ECU: REMOVAL 2022 MY RAV4 HV [12/2021 - 10/2022]; HYBRID / BATTERY CONTROL: HYBRID VEHICLE CONTROL ECU: REMOVAL 2023 MY RAV4 HV [10/2022 - 10/2023]; HYBRID / BATTERY CONTROL: HYBRID VEHICLE CONTROL ECU: REMOVAL 2024 MY RAV4 HV [10/2023 -        ]; HYBRID / BATTERY CONTROL: HYBRID VEHICLE CONTROL ECU: REMOVAL

9.

REPLACE FUSE (PCU)

(a) Replace the PCU fuse.

*1

No. 3 Relay Block and Junction Block Assembly

*2

PCU Fuse

(b) Turn the ignition switch to ON (READY).

(c) Check if there is an open circuit in the PCU fuse in the No. 3 relay block and junction block assembly.

OK:

There is no open circuit in the PCU fuse.

HINT:

If the fuse does not become open again after turning the ignition switch to ON (READY), it can be assumed that the previous fuse failed due to age.

(d) Turn the ignition switch off.

OK

COMPLETED

NG

10.

CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - PCU FUSE)

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 PCU fuse from the No. 3 relay block and junction block assembly.

(c) Disconnect the A87 inverter with converter assembly connector.

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

*1

No. 3 Relay Block and Junction Block Assembly

*2

PCU Fuse Terminal

*a

Front view of wire harness connector

(to Inverter with Converter Assembly)

-

-

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

A87-36 (+B), A87-35 (+B2) or 2 (PCU fuse terminal) - Body ground and other terminals

Ignition switch off

10 kΩ or higher

(e) Reconnect the A87 inverter with converter assembly connector.

(f) Install the PCU fuse.

NG

GO TO STEP 12

OK

11.

REPLACE INVERTER WITH CONVERTER ASSEMBLY

Click here 2020 MY RAV4 HV [06/2020 - 08/2020]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER (for AWD): REMOVAL 2021 MY RAV4 HV [08/2020 - 12/2021]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER (for AWD): REMOVAL 2022 MY RAV4 HV [12/2021 - 10/2022]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER (for AWD): REMOVAL 2023 MY RAV4 HV [10/2022 - 10/2023]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER (for AWD): REMOVAL 2024 MY RAV4 HV [10/2023 -        ]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER (for AWD): REMOVAL

NEXT

REPLACE FUSE (PCU)

12.

REPAIR OR REPLACE HARNESS OR CONNECTOR

NEXT

REPLACE FUSE (PCU)