HYBRID CONTROL SYSTEM, Diagnostic DTC:P1D97-450, P1D98-450

DTC Code DTC Name
P1D97-450 FC Converter Emergency Halt Circuit Low
P1D98-450 FC Converter Emergency Halt Circuit High

DTC SUMMARY


  1. MALFUNCTION DESCRIPTION

    The EV control ECU detects malfunctions in the disconnect signal (FSDN signal) to the FC boost control ECU.

    The cause of this malfunction may be one of the following:


      FSDN signal circuit malfunction

    • Wire harness malfunction

    • FC boost control ECU malfunction

    • EV Control ECU malfunction

DESCRIPTION

Refer to the wiring diagram for DTC P321E-318.

Click here

Refer to boost system diagram for the System Description.

Click here

If necessary, the EV control ECU shuts off the operation of the FC converter assembly by sending the shut off signal (FSDN signal) to the FC converter assembly.

If only either of the inverter with converter assembly and the FC converter assembly is shut off, difference in voltage may occur, and this may cause malfunctions such as a fuse blow. To prevent this, if the FC boost control ECU detects the shut off of the FC converter assembly, it immediately sends the converter fail signal (ISDN signal) to the EV control ECU.

When the EV control ECU receives the ISDN signal, it sends the HSDN signal (MG shut down signal) to the motor generator control ECU (MG ECU), and then shuts off the power supply to both the drive motor and FC air compressor motor, simultaneously.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate
P1D97-450 FC Converter Emergency Halt Circuit Low

The FSDN signal from the EV control ECU is ON but the CPU monitored value of the ISDN signal is OFF.

(1 trip detection logic)

  • Wire harness or connector

  • EV Control ECU

  • FC boost control ECU

 Master Warning Light: Comes on
P1D98-450 FC Converter Emergency Halt Circuit High

The FSDN signal from the EV control ECU is OFF but the CPU monitored value of the ISDN signal is ON.

(1 trip detection logic)

  • Wire harness or connector

  • EV Control ECU

  • FC boost control ECU

 Master Warning Light: Comes on
Related Data List
DTC No. ECU Data List

P1D97-450

P1D98-450

  • FC Emergency Shutdown Signal

  • Boosting Converter Fail Permission

WIRING DIAGRAM

Refer to the wiring diagram for the Shut Down Signal Circuit.

Click here

B000ZWFE01

CAUTION / NOTICE / HINT

CAUTION:


  • B006JFB
    B006JM4

    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 grips from both FC stack assembly and EV battery.


    • Inspecting the high-voltage system

    • Disconnecting the low voltage connector of the inverter with converter assembly

    • Disconnecting the low voltage connector of the EV battery

    • Disconnecting the low voltage connector of the FC stack assembly

    • Disconnecting the low voltage connector of the FC converter assembly

      Tech Tips

      No removal order is specified for the service plug grips of the FC stack assembly and EV battery.

  • B006JBZ

    After removing the service plug grip from the EV 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 grip from the FC stack assembly, store it in a safe location and use the "HIGH-VOLTAGE, DO NOT TOUCH" sign to notify other technicians that you are working on the high-voltage system.

  • B000ZMTC04
    *a Without waiting for 10 minutes

    After removal of the service plug grips of both FC stack assembly and EV battery, wait for at least 10 minutes before touching the high-voltage connectors and 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

    At least 10 minutes are necessary to discharge the high-voltage capacitors inside the inverter with converter assembly and FC stack 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.

    Click here

  • When reinstalling the service plug grip to the FC stack assembly or the EV battery, slide the lever of the service plug until the letters "UNLOCK" are completely hidden, and insert it firmly.

    Click here

  • When the vehicle is parked with the power switch off, if the FC control ECU judges that the FC stack temperature will go below 0°C (32°F), it activates the FC air compressor, hydrogen pump and FC cooling water pump for a maximum of 180 seconds and drains water from the FC stack assembly. When performing inspection or repairs with the power switch off (not on (IG) or on (READY)), disconnect the cable from the negative (-) auxiliary battery terminal before performing work (If the auxiliary battery voltage is needed to conduct inspection, warm up the FC system beforehand).

Tech Tips

After the repair, perform the following procedure to confirm the repair.


  1. Wait for 30 seconds or more with the vehicle stopped, the power switch on (READY) and the shift lever in P. Then turn the power switch off and wait for 4 minutes or more.

PROCEDURE


  1. CHECK CONNECTOR CONNECTION CONDITION (EV CONTROL ECU CONNECTOR)

    Result
    Proceed to
    OK
    NG

    1. A01MGTOC01
      *A for LHD
      *B for RHD

      Check the connector connections and contact pressure of the relevant terminals for the EV control ECU connectors.

      Click here

      OK
      The connectors are connected securely and there are no contact pressure problems.
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT SECURELY

    OK

  2. CHECK CONNECTOR CONNECTION CONDITION (FC CONVERTER ASSEMBLY 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

    CAUTION:

    Be sure to wear insulated gloves.


    1. Check that the service plug grip is not installed to FC stack assembly and EV battery.

      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. A01MFR3

      Check the connection condition of the FC converter assembly connector and the contact pressure of each terminal. Check the terminals for deformation, and check the connector for water ingress and foreign matter.

      Note

      Before disconnecting the connector, confirm that it is properly connected by checking that the locking claws are engaged and that the connector does not pull out.

      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

    B

    CONNECT SECURELY

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

  3. CHECK HARNESS AND CONNECTOR (EV CONTROL ECU - FC CONVERTER ASSEMBLY)

    CAUTION:

    Be sure to wear insulated gloves.


    1. Check that the service plug grip is not installed to FC stack assembly and EV battery.

      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 EV Control ECU connector.

    3. A01MHMW

      Disconnect the Ao2 FC converter assembly connector.

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

      B000ZRLC02
      *a

      Front view of wire harness connector

      (to FC Converter Assembly)

      		 *b

      Rear view of wire harness connector

      (to EV Control ECU)
      Standard Resistance
      Tester Connection Condition Specified Condition
      A27-3 (FSDN) or Ao2-4 (FSDN) - Body ground and other terminals Power switch off 10 kΩ or higher
      A27-3 (FSDN) - Ao2-4 (FSDN) Power switch off Below 1 Ω

    5. Reconnect the FC converter assembly connector.

    6. Reconnect the EV Control ECU connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK FC CONVERTER ASSEMBLY (CHECK FOR SHORT TO +B OR GND)

    CAUTION:

    Be sure to wear insulated gloves.


    1. Check that the service plug grip is not installed to FC stack assembly and EV battery.

      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. A01MFR3

      Disconnect the Ao1 and Ao2 FC converter assembly connector.

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

      B000ZTCC05
      *a

      Component without harness connected

      (FC Converter Assembly)

      		 *b

      Component without harness connected

      (FC Converter Assembly)
      Standard Resistance
      Tester Connection Condition Specified Condition
      Ao2-4 (FSDN) - Ao2-5 (E1) Power switch off 2.65 to 3.55 kΩ
      Ao2-4 (FSDN) - Ao2-6 (+B1) Power switch off 5 kΩ or higher
      Ao2-4 (FSDN) - Ao2-9 (BATT) Power switch off 10 kΩ or higher
      Ao2-4 (FSDN) - Ao2-11 (DRN0) Power switch off 10 kΩ or higher
      Ao2-4 (FSDN) - Ao2-12 (E2) Power switch off 10 kΩ or higher
      Ao2-4 (FSDN) - Ao2-13 (+B2) Power switch off 5 kΩ or higher
      Ao2-4 (FSDN) - Ao1-4 (CMPW) Power switch off 10 kΩ or higher
      Ao2-4 (FSDN) - Ao1-5 (GND) Power switch off 10 kΩ or higher
      Ao2-4 (FSDN) - Ao1-8 (IG2) Power switch off 10 kΩ or higher

    4. Reconnect the FC converter assembly connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE EV CONTROL ECU Click here

    NG

    REPLACE FC CONVERTER ASSEMBLY Click here