Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001RHD4
Model Year Start: 2021 Model: Avalon HV Prod Date Range: [08/2020 -           ]
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; 2021 - 2022 MY Avalon HV [08/2020 -        ]

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 2021 - 2022 MY Avalon HV [08/2020 -        ]; 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. The MG ECU monitors communication data and detects malfunctions.

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

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

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
  • PCU fuse

Comes on

Master Warning Light:

Comes on

MONITOR DESCRIPTION

The hybrid vehicle control ECU 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

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 present

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 P3123 (INF P312387) is not detected

CONFIRMATION DRIVING PATTERN

HINT:

  • After repair has been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

    Click here 2021 - 2022 MY Avalon HV [08/2020 -        ]; 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 2021 - 2022 MY Avalon HV [08/2020 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION 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 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 or N/A, perform the normal judgment procedure again.

WIRING DIAGRAM

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

Click here 2021 - 2022 MY Avalon HV [08/2020 -        ]; 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 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 MY Avalon HV [08/2020 - 08/2021]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY): PRECAUTION 2022 MY Avalon HV [08/2021 -        ]; 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 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.

INSPECT FUSE (PCU)

(a) Remove the PCU fuse from the No. 4 relay block.

(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. 4 Relay Block

*2

PCU Fuse

(c) Install the PCU fuse.

NG

GO TO STEP 9

OK

2.

CLEAR DTC

Click here 2021 - 2022 MY Avalon HV [08/2020 -        ]; 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 power switch on (IG) 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 power switch off.

B

CHECK FOR INTERMITTENT PROBLEMS

A

4.

CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)

Click here 2021 - 2022 MY Avalon HV [08/2020 -        ]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY): P056014; System Voltage (BATT) Circuit Short to Ground or Open+

NG

CONNECT SECURELY
OK

5.

CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)

Click here 2021 - 2022 MY Avalon HV [08/2020 -        ]; HYBRID / BATTERY CONTROL: MOTOR GENERATOR CONTROL SYSTEM (for LITHIUM-ION BATTERY): P033500,P033531; Crankshaft Position Sensor "A"+

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
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 power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Disconnect the A42 inverter with converter assembly connector.

Click here 2021 MY Avalon HV [08/2020 - 08/2021]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER: REMOVAL 2022 MY Avalon HV [08/2021 -        ]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER: REMOVAL

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A42-24 (GND1) - Body ground

Power switch off

Below 1 Ω

A42-23 (GND2) - Body ground

Power 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 power switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A42-6 (+B) - Body ground

Power switch on (IG)

11 to 14 V

A42-5 (+B2) - Body ground

Power switch on (IG)

11 to 14 V

NOTICE:

Turning the power switch on (IG) with the inverter with converter assembly disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

(g) Turn the power switch off.

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

(i) Reconnect the A42 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)

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 power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Disconnect the A42 inverter with converter assembly connector.

(c) Disconnect the A24 hybrid vehicle control ECU connector.

(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

A24-30 (HMCL) - Body ground

Power switch on (IG)

Below 1 V

A24-31 (HMCH) - Body ground

Power switch on (IG)

Below 1 V

NOTICE:

Turning the power switch on (IG) with the hybrid vehicle control ECU 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

Rear view of wire harness connector

(to Hybrid Vehicle Control ECU)

(g) Turn the power switch off.

(h) Disconnect the cable from the negative (-) auxiliary battery terminal and wait for 2 minutes or more.

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

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

A42-19 (HMCL) - A24-30 (HMCL)

Power switch off

Below 1 Ω

A42-20 (HMCH) - A24-31 (HMCH)

Power switch off

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

A42-19 (HMCL) or A24-30 (HMCL) - Body ground and other terminals

Power switch off

10 kΩ or higher

A42-20 (HMCH) or A24-31 (HMCH) - Body ground and other terminals

Power 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 is not loose or disconnected.

(j) Reconnect the A24 hybrid vehicle control ECU connector.

(k) Reconnect the A42 inverter with converter assembly connector.

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

8.

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 power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Disconnect the A42 inverter with converter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A24-30 (HMCL) -A24-31 (HMCH)

Power switch off

110 to 130 Ω

*a

Component with harness connected

(Hybrid Vehicle Control ECU)

(d) Reconnect the A42 inverter with converter assembly connector.

OK

REPLACE INVERTER WITH CONVERTER ASSEMBLY 2021 MY Avalon HV [08/2020 - 08/2021]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER: REMOVAL 2022 MY Avalon HV [08/2021 -        ]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER: REMOVAL

NG

REPLACE HYBRID VEHICLE CONTROL ECU 2019 - 2021 MY Avalon HV [04/2018 - 08/2021]; HYBRID / BATTERY CONTROL: HYBRID VEHICLE CONTROL ECU: REMOVAL 2022 MY Avalon HV [08/2021 -        ]; HYBRID / BATTERY CONTROL: HYBRID VEHICLE CONTROL ECU: REMOVAL

9.

REPLACE FUSE (PCU)

(a) Replace the PCU fuse.

*1

No. 4 Relay Block

*2

PCU Fuse

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

(c) Check if there is an open circuit in the PCU fuse in the No. 4 relay block.

OK:

There is no open circuit in the PCU fuse.

HINT:

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

(d) Turn the power switch off.

OK

END
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 power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Remove the PCU fuse from the No. 4 relay block.

(c) Disconnect the A42 inverter with converter assembly connector.

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

*1

No. 4 Relay Block

*2

PCU Fuse

*a

Front view of wire harness connector

(to Inverter with Converter Assembly)

-

-

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

A42-6 (+B), A42-5 (+B2) or 2 (PCU fuse terminal) - Body ground and other terminals

Power switch off

10 kΩ or higher

(e) Reconnect the A42 inverter with converter assembly connector.

(f) Install the PCU fuse.

NG

GO TO STEP 12

OK

11.

REPLACE INVERTER WITH CONVERTER ASSEMBLY

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NEXT

REPLACE FUSE (PCU)

12.

REPAIR OR REPLACE HARNESS OR CONNECTOR
NEXT

REPLACE FUSE (PCU)