FC CONTROL SYSTEM, Diagnostic DTC:P0101-450

DTC Code DTC Name
P0101-450 Mass Air Flow Circuit Range/Performance

DESCRIPTION

The air system of the FC system feeds the FC stack with oxygen, so that the FC stack can generate power. The mass air flow meter is used to measure the airflow rate from the FC air compressor to the FC stack, contributing to appropriate airflow control for the FC stack power generation.

If a measured airflow rate of the mass air flow meter has abnormally deviated from the predicted airflow rate that is obtained from the FC air compressor speed, the FC control ECU interprets it as sensor range deviation, and sets the DTC.

A01MIG6C06
*1 Mass Air Flow Meter *2 Intake Air Temperature Sensor
*3 Airflow sensor *4 FC Air Compressor with Motor Assembly
*5 FC Air Compressor *6 Intercooler
*7 FC Gas Temperature Sensor *8 FC Stack Inlet Air Pressure Sensor (Turbo Pressure Sensor)
*9 Air Shunt Valve *10 FC Stack
*11 FC Stack Assembly *12 Air Pressure Regulating Valve
*13 FC Exhaust Tail Pipe Assembly *14 Air Cleaner Filter Element Sub-assembly
*a Air intake system *b Air exhaust system
DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate
P0101-450 Mass Air Flow Circuit Range/Performance

If the following 2 values have significantly exceeded the thresholds, the DTC will be set:


  • Airflow rate (intake mass air flow meter sub-assembly output value)

  • Predicted airflow rate that is obtained from FC air compressor speeds and air pressure (Smoothed Value of FC Stack Air Pressure (FC Stack Inlet))

This malfunction detection begins when "FC Mode" is in the conditions other than FC Shutdown.

(1 trip detection logic)

  • Air system (including the air cleaner filter element sub-assembly)

  • Mass air flow meter

  • FC air compressor with motor assembly

  • FC stack inlet air pressure sensor (turbo pressure sensor)

 Master Warning Light: Comes on

Tech Tips

This DTC will be set if the correlation between air compressor speeds, air pressure and mass air flow sensor airflow rates has deviated due to clogged or damaged FC air system lines or a malfunctioning mass air flow meter.

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" 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
P0101-450

  • Mass Air Flow Value

  • Air Compressor Revolution

  • Smoothed Value of FC Stack Air Pressure (FC Stack Inlet)

The following items can be helpful when performing repairs:


Related Active Test
DTC No. Active Test
P0101-450 FC Air Compressor
Related Utility
DTC No. Utility
P0101-450 Check Mode (Air System Component Inspection)

Tech Tips

By entering "Check Mode", abnormalities in the air shunt valve, air pressure regulating valve or air system lines can be found.

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. Drive the vehicle for 10 minutes according to the freeze frame data (Vehicle Speed, Accelerator Degree, Mass Air Flow Value).

    CAUTION:

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

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
      P0101-450 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
      System Malfunction P1D7F-450 Air Compressor Speed Control Performance
      P1E48-450 Barometric Pressure Sensor / FC Stack Air Pressure Sensor (FC Stack Inlet)Correlation

      Tech Tips

      DTC P0101-450 may be set due to problems that cause the DTCs shown above to be output. If such happens, troubleshoot the suspected area(s) corresponding to the output DTC(s) in order starting with the listed DTCs shown in the table above.

    6. Turn the power switch off.


    B

    GO TO DTC CHART Click here

    A

  2. CHECK DTC OUTPUT (EV)

    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 / EV / Trouble Codes.

    5. Check for DTCs.


      Powertrain > EV > Trouble Codes
      Result
      Result Proceed to
      DTCs other than those shown in the table below are output A
      Any of the DTCs shown in the table below are output. B
      Malfunction Content Relevant DTC
      Microcomputer Malfunction P1D8F-474, 475, 476, 477, 478, 479, 481, 482, 483, 484 FC Air Compressor Motor "A" Control Module
      Sensor and Actuator Circuit Malfunction P1D75-450 FC Air Compressor Motor "A" Position Sensor Circuit
      P1D76-450 FC Air Compressor Motor "A" Position Sensor Circuit Range/Performance
      P1D77-450 FC Air Compressor Motor "A" Position Sensor Circuit Low

      Tech Tips

      DTC P0101-450 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 (HYBRID CONTROL SYSTEM) Click here

    A

  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 AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY


    1. Check that the air cleaner filter element sub-assembly is not clogged.

      OK
      The air cleaner filter element sub-assembly is not clogged
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 6 Click here

    NG

  5. CLEAN OR REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY


    1. Clean or replace the air cleaner filter element sub-assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK INTAKE AND EXHAUST PIPING


    1. Check that no air comes in without flowing through each part of the intake air system and the exhaust drainage pipe is not clogged, disconnected, or damaged.

      OK
      The intake and exhaust piping is not clogged, disconnected or damaged
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MASS AIR FLOW METER Click here

    NG

    REPAIR OR REPLACE MALFUNCTIONING PARTS