Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001GCL7
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 09/2022]
Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): P312387; Lost Communication with Drive Motor Control Module "A" from Hybrid/EV Control Module Missing Message; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

DTC

P312387

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

DESCRIPTION

Refer to the description for P0D2D16.

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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 FR fuse

Does not come on

Master Warning: Comes on

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 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE BATTERY): UTILITY

  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.
  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 driving pattern again.

WIRING DIAGRAM

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

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE 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 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE 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 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.

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PROCEDURE

1.

INSPECT FUSE (PCU FR)

(a) Remove the PCU FR fuse from the No. 1 engine room relay block and No. 1 junction block assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

PCU FR fuse

Always

Below 1 Ω

*1

No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly

*2

PCU FR Fuse

(c) Install the PCU FR fuse.

NG

GO TO STEP 9

OK

2.

CLEAR DTC

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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.

(e) Check for Diagnosis Related Information and DTCs.

Powertrain > Hybrid Control > Trouble Codes

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 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for NICKEL METAL HYDRIDE 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)

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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 C89 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

C89-24 (GND1) - Body ground

Power switch off

Below 1 Ω

C89-23 (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

C89-6 (+B) - Body ground

Power switch on (IG)

11 to 14 V

C89-5 (+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 C89 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 C89 inverter with converter assembly connector.

(c) Disconnect the A57 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

A57-14 (HMCL) - Body ground

Power switch on (IG)

Below 1 V

A57-4 (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

Front 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.

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

Standard Resistance (Check for Open):

Tester Connection

Condition

Specified Condition

C89-19 (HMCL) - A57-14 (HMCL)

Power switch off

Below 1 Ω

C89-20 (HMCH) - A57-4 (HMCH)

Power switch off

Below 1 Ω

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

C89-19 (HMCL) or A57-14 (HMCL) - Body ground and other terminals

Power switch off

10 kΩ or higher

C89-20 (HMCH) or A57-4 (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 A57 hybrid vehicle control ECU connector.

(k) Reconnect the C89 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 C89 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)

-

-

Standard Resistance:

Tester Connection

Condition

Specified Condition

A57-14 (HMCL) -A57-4 (HMCH)

Power switch off

110 to 130 Ω

(d) Reconnect the C89 inverter with converter assembly connector.

OK

REPLACE INVERTER WITH CONVERTER ASSEMBLY 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER: REMOVAL 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER: REMOVAL

NG

REPLACE HYBRID VEHICLE CONTROL ECU 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; HYBRID / BATTERY CONTROL: HYBRID VEHICLE CONTROL ECU: REMOVAL 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID VEHICLE CONTROL ECU: REMOVAL

9.

REPLACE FUSE (PCU FR)

(a) Replace the PCU FR fuse.

*1

No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly

*2

PCU FR Fuse

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

(c) Check if there is an open circuit in the PCU FR fuse in the No. 1 engine room relay block and No. 1 junction block assembly.

OK:

There is no open circuit in the PCU FR 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 FR 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 FR fuse from the No. 1 engine room relay block and No. 1 junction block assembly.

(c) Disconnect the C89 inverter with converter assembly connector.

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

*1

No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly

*2

PCU FR Fuse Holder

*a

Front view of wire harness connector

(to Inverter with Converter Assembly)

-

-

Standard Resistance (Check for Short):

Tester Connection

Condition

Specified Condition

C89-6 (+B), C89-5 (+B2) or 2 (PCU FR fuse holder) - Body ground and other terminals

Power switch off

10 kΩ or higher

(e) Reconnect the C89 inverter with converter assembly connector.

(f) Install the PCU FR fuse.

NG

GO TO STEP 12

OK

11.

REPLACE INVERTER WITH CONVERTER ASSEMBLY

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NEXT

REPLACE FUSE (PCU FR)

12.

REPAIR OR REPLACE HARNESS OR CONNECTOR
NEXT

REPLACE FUSE (PCU FR)