FC CONTROL SYSTEM, Diagnostic DTC:P1DC9-450

DTC Code DTC Name
P1DC9-450 Lost Communication with FC Water Pump Inverter

DESCRIPTION

The FC control ECU detects serial communication malfunctions in the FC water and hydrogen pump inverter assembly (FC water pump inverter).

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate
P1DC9-450 Lost Communication with FC Water Pump Inverter

"FC mode" is in FC Startup Process or FC Working, and a FC water pump inverter communication error has continued for more than 5 seconds.

(1 trip detection logic)

  • FC water and hydrogen pump inverter assembly (FC water pump inverter)

  • FC control ECU

  • Wire harness or connector

 Master Warning Light: Comes on
Detection timing
Vehicle Condition

FC shutdown

(power switch on (IG))

 FC startup process FC intermittent operation

FC is generating power

(vehicle is in stationary)

FC is generating power

(vehicle is traveling)

 FC shutdown process

Data List

"FC Mode"

 FC Shutdown FC Startup Process FC Working FC Shutdown Process

Data List

"FC Intermittent Operation"

 OFF ON OFF OFF
DTC Detection - ○ ○ ○ ○ -

Tech Tips

By accessing the "FC Mode" and "FC Intermittent Operation" in the freeze frame data, the FC system condition at the time the malfunction occurred can be checked.

Related Data List
DTC No. Data List
P1DC9-450 -

WIRING DIAGRAM

A01MG3RE07

CAUTION / NOTICE / HINT

Note


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

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


  1. Turn the power switch on (READY) with the shift lever in P, and check the Data List that "FC Mode" is FC Working. Then, wait for 2 minutes or more.

PROCEDURE


  1. CHECK TERMINAL VOLTAGE (POWER SOURCE OF FC WATER AND HYDROGEN PUMP INVERTER ASSEMBLY (FC WATER PUMP INVERTER ))


    1. B000ZLU

      Disconnect the FC water and hydrogen pump inverter assembly (FC water pump inverter) connector.

    2. Turn the power switch on (IG).

    3. A01MGTRC03
      *a

      Front view of wire harness connector

      (to FC Water and Hydrogen Pump Inverter Assembly (FC Water Pump Inverter))

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A50-8 (W+B1) - Body ground Power switch on (IG) 11 to 14 V

    4. Turn the power switch off.

    5. Reconnect the FC water and hydrogen pump inverter assembly (FC water pump inverter) connector.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (FC WATER AND HYDROGEN PUMP INVERTER ASSEMBLY (FC WATER PUMP INVERTER ) - FC-IGCT RELAY) Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (FC WATER AND HYDROGEN PUMP INVERTER ASSEMBLY (FC WATER PUMP INVERTER) - BODY GROUND)


    1. A01MGTRC04
      *a

      Front view of wire harness connector

      (to FC Water and Hydrogen Pump Inverter Assembly (FC Water Pump Inverter))

      Disconnect the FC water and hydrogen pump inverter assembly (FC water pump inverter) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A50-1 (WGND) - Body ground Always Below 1 Ω

    3. Reconnect the FC water and hydrogen pump inverter assembly (FC water pump inverter) connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (FC CONTROL ECU - FC WATER AND HYDROGEN PUMP INVERTER ASSEMBLY (FC WATER PUMP INVERTER))


    1. Disconnect the FC control ECU connector.

    2. Disconnect the FC water and hydrogen pump inverter assembly (FC water pump inverter) connector.

    3. B000ZJFC01
      *a

      Front view of wire harness connector

      (to FC Water and Hydrogen Pump Inverter Assembly (FC Water Pump Inverter))
      *b

      Front view of wire harness connector

      (to FC Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A48-39 (WEI1) - A50-7 (WEI1) Always Below 1 Ω
      A48-47 (WIE1) - A50-3 (WIE1) Always Below 1 Ω
      A48-48 (WCK1) - A50-6 (WCK1) Always Below 1 Ω
      A48-39 (WEI1) or A50-7 (WEI1) - Body ground and other terminals Always 10 kΩ or higher
      A48-47 (WIE1) or A50-3 (WIE1) - Body ground and other terminals Always 10 kΩ or higher
      A48-48 (WCK1) or A50-6 (WCK1) - Body ground and other terminals Always 10 kΩ or higher

    4. Reconnect the FC water and hydrogen pump inverter assembly (FC water pump inverter) connector.

    5. Reconnect the FC control ECU connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. REPLACE FC CONTROL ECU

    Click here

    Result
    Proceed to
    NEXT

    NEXT

  5. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / FC / Trouble Codes.

    5. Clear the DTCs.


      Powertrain > FC > Clear DTCs

    6. Turn the power switch off and wait for 3 minutes or more.

      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK DTC OUTPUT


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / FC / Data List / FC Mode


      Powertrain > FC > Data List
      Tester Display
      FC Mode

    5. Turn the power switch on (READY) with the shift lever in P, and check the Data List that "FC Mode" is FC Working. Then, wait for 2 minutes or more.

    6. Enter the following menus: Powertrain / FC / Trouble Codes.

    7. Check for DTCs.


      Powertrain > FC > Trouble Codes
      Result
      Result Proceed to
      DTC P1DC9-450 is output A
      DTCs are not output B

    8. Turn the power switch off.


    A

    REPLACE FC WATER AND HYDROGEN PUMP INVERTER ASSEMBLY (FC WATER PUMP INVERTER) Click here

    B

    END

  7. CHECK HARNESS AND CONNECTOR (FC WATER AND HYDROGEN PUMP INVERTER ASSEMBLY (FC WATER PUMP INVERTER ) - FC-IGCT RELAY)


    1. Disconnect the FC water and hydrogen pump inverter assembly (FC water pump inverter) connector.

    2. Remove the FC-IGCT relay from the motor compartment relay block.

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

      A01MGMSC06
      *1 Motor Compartment Relay Block *2 FC-IGCT Relay Holder
      *a

      Front view of wire harness connector

      (to FC Water and Hydrogen Pump Inverter Assembly (FC Water Pump Inverter))

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      A50-8 (W+B1) - 3 (FC-IGCT relay holder) Always Below 1 Ω
      A50-8 (W+B1) or 3 (FC-IGCT relay holder) - Body ground and other terminals Always 10 kΩ or higher

    4. Reinstall the FC-IGCT relay.

    5. Reconnect the FC water and hydrogen pump inverter assembly (FC water pump inverter) connector.

      Result
      Proceed to
      OK
      NG

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR