FC CONTROL SYSTEM, Diagnostic DTC:P1D3F-450

DTC Code DTC Name
P1D3F-450 FC Stack Voltage Low

DESCRIPTION

During FC power generation, the FC stack generates a voltage of 220 to 370 V and feeds it into the FC converter assembly through the stack positive and negative circuits. (The stack voltage gradually decreases as the FC system stops)

If a voltage, which is normally 220 to 370 V, between the stack positive and negative circuits decreases abnormally, due to overcurrent caused by short-circuited terminals, the FC control ECU interprets it as a malfunction and store this DTC.

A01MGT3E01
DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate
P1D3F-450 FC Stack Voltage Low

If the FC stack total voltage (sum of each cell voltage measured by the cell monitor) has decreased below a specified voltage.

This malfunction detection is activated when the amount of supplied air and hydrogen is sufficient during power generation of the FC stack ("FC Mode" is in FC Working).

(1 trip detection logic)

 FC stack assembly Master Warning Light: Comes on

Tech Tips

If there is a short circuit in the FC stack output (trigger for this DTC), the FC system cannot be actuated. If actuation is allowed, the malfunction has not been reproduced.

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
P1D3F-450

  • FC Total Voltage

  • FC Voltage before Boosting

The following items can be helpful when performing repairs:


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


  • Forcing the SOC of the EV battery to decrease by applying electrical loads such as turning on the air conditioning (HOT MAX, maximum airflow), or depressing the accelerator pedal with the shift lever in P, the "FC Intermittent Operation" of the Data List is easily to enter OFF (power generation mode).

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 and "FC Intermittent Operation" is OFF.

  2. Check that the "FC Total Voltage" value of the Data List is more than 200 V (except for a situation where an ambient temperature is below 0°C (32°F) or intermittent operation is active).

PROCEDURE


  1. CHECK DTC OUTPUT

    Note

    The freeze frame data is cleared when DTCs are cleared. Be sure to make a note of necessary data in advance.


    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. Check for DTCs.


      Powertrain > FC > Trouble Codes
      Result
      Result Proceed to
      P1D3F-450 only is output, or DTCs except the ones in the table below are also output. A
      Any of the following DTCs are also output. B
      Malfunction Content Relevant DTC
      Microcomputer Malfunction / Power Source Circuit Malfunction P1DCF-450 Cell Monitor Performance
      Communication System Malfunction P1D5F-450 Lost Communication with Cell Monitor
      Sensor and Actuator Circuit Malfunction P1D24-450 Hydrogen Pump Speed Control Performance
      P1D7F-450 Air Compressor Speed Control Performance
      P1E36-450 Tank Shut Valve 1 Stuck Open or Close
      P1E38-450 Tank Shut Valve 2 Stuck Open or Close
      P1E48-450 Barometric Pressure Sensor / FC Stack Air Pressure Sensor (FC Stack Inlet)Correlation
      System Malfunction P0101-450 Mass Air Flow Circuit Range/Performance
      P1D91-450 Air Control System Performance
      P1DC0-450 Low-range Hydrogen Pressure Too Low
      P1DC5-450 Air Pressure Too High
      P1E42-450 Hydrogen Pressure Leak (Excessive Hydrogen Flow)

      Tech Tips

      DTC P1D3F-450 may be set due to problems that cause the DTCs shown above to output. If such happens, troubleshoot the suspected area(s) corresponding to the output DTC(s) in order of the listed DTCs shown in the table above.

    6. Turn the power switch off.


    B

    GO TO DTC CHART Click here

    A

  2. 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

  3. CHECK FREEZE FRAME DATA

    Note

    The freeze frame data is cleared when DTCs are cleared. Be sure to make a note of necessary data in advance.


    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. Read the freeze frame data of DTC P1D3F-450.

      Result
      Result Proceed to
      Other than below A
      Voltage difference between "FC Total Voltage" and "FC Voltage before Boosting" is more than 50 V* B

      • *: The cell monitor is malfunctioning

    6. Turn the power switch off.


    B

    REPLACE FC STACK ASSEMBLY Click here

    A

  4. READ VALUE USING GTS (FC MODE, FC INTERMITTENT OPERATION, FC TOTAL VOLTAGE)


    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, FC Intermittent Operation, FC Total Voltage


      Powertrain > FC > Data List
      Tester Display
      FC Mode
      FC Intermittent Operation
      FC Total Voltage

    5. Turn the power switch on (READY) with the shift lever in P, and check the Data List that "FC Mode" is FC Working and "FC Intermittent Operation" is OFF.

    6. Read the "FC Total Voltage" of the Data List.

      Result
      Result Proceed to
      FC system can be actuated A
      FC system cannot be actuated, and "FC Total Voltage" is less than 200 V B

    B

    REPLACE FC STACK ASSEMBLY Click here

    A

  5. SIMULATION TEST


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Drive the vehicle for 10 minutes according to the freeze frame data (Vehicle Speed, Accelerator Degree, etc.)

      CAUTION:

      Perform this road test only in an appropriate safe location, in accordance with all local laws.

      Tech Tips

      If vehicle speeds, accelerator pedal positions, road conditions, ambient temperatures and climates at the time the malfunction occurred can be found out, take them into account.

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

    6. Check for DTCs.


      Powertrain > FC > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A
      DTC P1D3F-450 is output B

    7. Turn the power switch off.


    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

    REPLACE FC STACK ASSEMBLY Click here