FC BOOST CONTROL SYSTEM, Diagnostic DTC:P1D9F-450, P1DAF-450, P1DBF-450

DTC Code DTC Name
P1D9F-450 Internal Control Module Voltage (+26V Power Source)
P1DAF-450 Internal Control Module Voltage (-5V Power Source)
P1DBF-450 Internal Control Module Voltage (5V Power Source)

DESCRIPTION

The FC boost control ECU is located inside the FC converter assembly. It monitors its internal operation and will store this DTC when it detects an ECU internal malfunction.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate
P1D9F-450 Internal Control Module Voltage (+26V Power Source)

Internal malfunction of FC boost control ECU which is located inside FC converter (+26 V power source malfunction inside ECU) is detected.

(1 trip detection logic)

  • FC converter assembly

  • ECU power source circuit

 Master Warning Light: Comes on
P1DAF-450 Internal Control Module Voltage (-5V Power Source)

Internal malfunction of FC boost control ECU which is located inside FC converter (-5 V power source malfunction inside ECU) is detected.

(1 trip detection logic)

  • FC converter assembly

  • ECU power source circuit

 Master Warning Light: Comes on
P1DBF-450 Internal Control Module Voltage (5V Power Source)

Internal malfunction of FC boost control ECU which is located inside FC converter (power source IC malfunction inside ECU) is detected.

(1 trip detection logic)

  • FC converter assembly

  • ECU power source circuit

 Master Warning Light: Comes on
Related Data List
DTC No. Data List
P1D9F-450 26V Voltage AD Value
P1DAF-450 -5 Voltage AD Value
P1DBF-450 5 Voltage AD Value

WIRING DIAGRAM

B000ZFDE01

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.

    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


  • 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).

  • 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

  • Inspect the fuses for circuits related to this system before performing the following procedure.

Tech Tips

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


  • Turn the power switch on (READY) and wait for 5 seconds or more.

PROCEDURE


  1. CHECK ECU POWER SOURCE CIRCUIT


    1. Check for ECU power source circuit.

      Click here

      Tech Tips


      • DTC P1D9F-450, P1DAF-450 or P1DBF-450 may be stored due to a malfunction in the power source circuit (+B1, +B2 terminal) of the FC boost control ECU.

      • If there is a malfunction in the ECU power source circuit, do not proceed with the REPLACE FC CONVERTER ASSEMBLY procedure.

      Result
      Proceed to
      NEXT

    NEXT

  2. REPLACE FC CONVERTER ASSEMBLY

    Click here

    Result
    Proceed to
    NEXT

    NEXT

    END