FC CONTROL SYSTEM, Diagnostic DTC:P1DF7-450, P1DF8-450

DTC Code DTC Name
P1DF7-450 FC Water Pump Inverter Drive Signal Stuck ON
P1DF8-450 FC Water Pump Inverter Drive Signal Stuck OFF

DESCRIPTION

Upon receipt of FC water pump inverter actuation signals (STB), the FC control ECU actuates or stops the FC water and hydrogen pump inverter assembly (FC water pump inverter).

The FC control ECU receives ON or OFF FC water pump inverter actuation signals (STB) from the inverter, and it detects STB ON or OFF stuck malfunctions from requested and received (monitor) values.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate
P1DF7-450 FC Water Pump Inverter Drive Signal Stuck ON

All of the following conditions are met and a FC water pump inverter STB signal has remained ON for more than 1 second:


  • FC Mode is in modes other than FC Shutdown

  • There is no abnormality in the FC water pump inverter communication

  • STB request is OFF

(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
P1DF8-450 FC Water Pump Inverter Drive Signal Stuck OFF

All of the following conditions are met and a FC water pump inverter STB signal has remained OFF for more than 1 second:


  • FC Mode is in modes other than FC Shutdown

  • There is no abnormality in the FC water pump inverter communication

  • STB request is ON

(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
P1DF7-450 FC Water Pump Inverter Driving Permit
P1DF8-450

WIRING DIAGRAM

B000ZUVE07
*a FC Control ECU
*b FC Water and Hydrogen Pump Inverter Assembly (FC Water Pump Inverter)

CAUTION / NOTICE / HINT

Note

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) and wait for 15 seconds or more.

  2. Turn the power switch off and wait for 15 seconds or more.

PROCEDURE


  1. 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. B000ZLU

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

    3. B000ZJFC02
      *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
      A48-27 (WSB1) - A50-2 (WSB1) Always Below 1 Ω
      A48-27 (WSB1) or A50-2 (WSB1) - 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

  2. REPLACE FC CONTROL ECU

    Click here

    Result
    Proceed to
    NEXT

    NEXT

  3. 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

  4. CHECK DTC OUTPUT


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (READY) and wait for 15 seconds or more.

    3. Turn the power switch off and wait for 15 seconds or more.

    4. Turn the power switch on (IG).

    5. Turn the GTS on.

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

    7. Check for DTCs.


      Powertrain > FC > Trouble Codes
      Result
      Result Proceed to
      DTC P1DF7-450 or P1DF8-450 are 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