HYBRID CONTROL SYSTEM, Diagnostic DTC:P312387

Info Added 2017-10-06

DTC Code DTC Name
P312387 Lost Communication with Drive Motor Control Module "A" from Hybrid/EV Control Module Missing Message

DESCRIPTION

For a description of the inverter.

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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 transaxle assembly

  • Hybrid vehicle control ECU

  • PCU FR fuse

 Does not come on

Master Warning Light:

Comes on

CONFIRMATION DRIVING PATTERN

Tech Tips

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

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  1. Connect the GTS to the DLC3.

  2. Turn the power switch on (IG) and turn the GTS 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 GTS 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.

    Tech Tips


    • 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

CAUTION / NOTICE / HINT

CAUTION:


  • B0048QQ

    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


  • A005NJP

    To prevent electric shock, make sure to remove the service plug grip to cut off the high voltage circuit before servicing the vehicle.


  • A005NAH

    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.


  • B0048M5C01
    *a Without waiting for 10 minutes

    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

    Tech Tips

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

Note

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)


    1. Remove the PCU FR fuse from the No. 1 engine room relay block.

    2. A005NFIC01
      *1 No. 1 Engine Room Relay Block
      *2 PCU FR Fuse

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      PCU FR fuse terminals Always Below 1 Ω

    3. Install the PCU FR fuse.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FUSE (PCU FR) Click here

    OK

  2. CLEAR DTC

    Result
    Proceed to
    NEXT

    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

    4. Read and record the DTCs and freeze frame data.


      Powertrain > Hybrid Control > Trouble Codes

    5. Clear the DTCs and freeze frame data.


      Powertrain > Hybrid Control > Clear DTCs

    6. Turn the power switch off.

      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK DIAGNOSIS RELATED INFORMATION AND DTC OUTPUT (HYBRID CONTROL)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG) and wait for 2 minutes or more.

    3. Enter the following menus: Powertrain / Hybrid Control / Utility / Diagnosis Related Information.


      Powertrain > Hybrid Control > Utility
      Tester Display
      Diagnosis Related Information

    4. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.


      Powertrain > Hybrid Control > Trouble Codes

    5. Check for DTCs.

      Result
      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

    6. Turn the power switch off.


    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

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

    CAUTION:

    Be sure to wear insulated gloves.


    1. Check that the service plug grip is not installed.

      Note

      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.

    2. Disconnect the inverter with converter assembly connector.

      Click here

    3. A005N21C07
      *a

      Front view of wire harness connector

      (to Inverter with Converter Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C65-24 (GND1) - Body ground Power switch off Below 1 Ω
      C65-23 (GND2) - Body ground Power switch off Below 1 Ω

    4. Connect the cable to the negative (-) auxiliary battery terminal and wait for 2 minutes or more.

    5. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      C65-6 (+B) - Body ground Power switch on (IG) 11 to 14 V
      C65-5 (+B2) - Body ground Power switch on (IG) 11 to 14 V

      Note

      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.

    7. Turn the power switch off.

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

    9. Reconnect the inverter with converter assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - HYBRID VEHICLE CONTROL ECU)

    CAUTION:

    Be sure to wear insulated gloves.


    1. Check that the service plug grip is not installed.

      Note

      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.

    2. Disconnect the inverter with converter assembly connector.

    3. Disconnect the hybrid vehicle control ECU connector.

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

    5. Turn the power switch on (IG).

    6. A005NMKC01
      *a

      Front view of wire harness connector

      (to Inverter with Converter Assembly)
      *b

      Rear view of wire harness connector

      (to Hybrid Vehicle Control ECU)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A48-30 (HMCL) - Body ground Power switch on (IG) Below 1 V
      A48-31 (HMCH) - Body ground Power switch on (IG) Below 1 V

      Note

      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.

    7. Turn the power switch off.

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

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      C65-19 (HMCL) - A48-30 (HMCL) Power switch off Below 1 Ω
      C65-20 (HMCH) - A48-31 (HMCH) Power switch off Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      C65-19 (HMCL) or A48-30 (HMCL) - Body ground and other terminals Power switch off 10 kΩ or higher
      C65-20 (HMCH) or A48-31 (HMCH) - Body ground and other terminals Power switch off 10 kΩ or higher

    10. Reconnect the hybrid vehicle control ECU connector.

    11. Reconnect the inverter with converter assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK INVERTER WITH CONVERTER ASSEMBLY

    CAUTION:

    Be sure to wear insulated gloves.


    1. Check that the service plug grip is not installed.

      Note

      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.

    2. Disconnect the C65 inverter with converter assembly connector.

    3. A005NZLC13
      *a

      Component with harness connected

      (Hybrid Vehicle Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A48-30 (HMCL) -A48-31 (HMCH) Power switch off 110 to 130 Ω

    4. Reconnect the C65 inverter with converter assembly connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    NG

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

  7. REPLACE FUSE (PCU FR)


    1. A005NFIC01
      *1 No. 1 Engine Room Relay Block
      *2 PCU FR Fuse

      Replace the PCU FR fuse.

    2. Turn the power switch on (READY).

    3. Check if there is an open circuit in the PCU FR fuse in the No. 1 engine room relay block.

      OK
      There is no open circuit in the PCU FR fuse.

      Tech Tips

      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.

    4. Turn the power switch off.

      Result
      Proceed to
      OK
      NG

    OK

    COMPLETED

    NG

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

    CAUTION:

    Be sure to wear insulated gloves.


    1. Check that the service plug grip is not installed.

      Note

      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.

    2. Remove the PCU FR fuse from the No. 1 engine room relay block.

    3. Disconnect the inverter with converter assembly connector.

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

      A005NGHC02
      *1 No. 1 Engine Room Relay Block - -
      *a

      Front view of wire harness connector

      (to Inverter with Converter Assembly)

      		 *b PCU FR Fuse Holder
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      C65-6 (+B), C65-5 (+B2) or 2 (PCU FR fuse holder) - Body ground and other terminals Power switch off 10 kΩ or higher

    5. Reconnect the inverter with converter assembly connector.

    6. Install the PCU FR fuse.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  9. REPLACE INVERTER WITH CONVERTER ASSEMBLY

    Click here

    Result
    Proceed to
    NEXT

    NEXT

    REPLACE FUSE (PCU FR)

  10. REPAIR OR REPLACE HARNESS OR CONNECTOR

    Result
    Proceed to
    NEXT

    NEXT

    REPLACE FUSE (PCU FR)