FC CONTROL SYSTEM, Diagnostic DTC:P1D7F-450

DTC Code DTC Name
P1D7F-450 Air Compressor Speed Control Performance

DESCRIPTION

The air system of the FC system feeds the FC stack with oxygen, so that the FC stack can generate power. The air system calculates air volume appropriate to the amount of power the FC stack has to generate, and regulates the FC air compressor speed according to such estimated air volume.

If the actual air compressor speed does not correspond to a target compressor speed, or the actual power consumption of the air compressor is abnormally higher than estimated power consumption that is obtained from the current compressor speed, the FC control ECU will set this DTC.

For the circuit diagram, refer to P0101-450.

Click here

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate
P1D7F-450 Air Compressor Speed Control Performance

If the "FC mode" is in FC Working mode and any one of the following conditions is met:


  • Significant difference has been found between the actual and target air compressor speeds

  • Significant gap has developed between the actual air compressor power consumption and the estimated operating power calculated from the air compressor airflow rate

(1 trip detection logic)

  • FC air compressor with motor assembly

  • Air cleaner filter element sub-assembly

  • Air system lines

  • FC stack assembly

 Master Warning Light: Comes on
DTC Detection Condition Patterns:
Vehicle Condition
Pattern 1 Pattern 2
Diagnostic Condition The Data List that "FC Mode" is FC Working ○ ○
Malfunction Condition Significant difference has been found between the actual and target air compressor speeds ○ -
Significant gap has developed between the actual air compressor power consumption and the estimated operating power calculated from the air compressor airflow rate - ○
Duration - -
Detection Logic 1 trip detection logic 1 trip detection logic

Tech Tips

This DTC is output when either of the above detection patterns is met.

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
P1D7F-450

  • Target Air Compressor Revolution

  • Air Compressor Revolution

  • Target Mass Air Flow Value

  • Mass Air Flow Value

  • Air Compressor Consumption Power

  • FC Stack Air Pressure (FC Stack Inlet)

  • Target FC Stack Air Pressure (FC Stack Inlet)

The following items can be helpful when performing repairs:



Related Active Test
DTC No. Active Test
P1D7F-450 FC Air Compressor

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, etc.).

    CAUTION:

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

  2. Perform the "FC Air Compressor" Active Test. Check that the difference between the set speed in the Active Test and the "Air Compressor Revolution" in the Data List is within 200 rpm.

PROCEDURE


  1. 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
      No DTCs for the hybrid control system (EV) are output, or DTCs other than those shown in the table below are output together A
      Any of the following DTCs are also 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 P1D71-450 FC Air Compressor Motor Inverter Temperature Sensor "A" Correlation
      P1D72-450 FC Air Compressor Motor Inverter Temperature Sensor "A" Circuit Low
      P1D73-450 FC Air Compressor Motor Inverter Temperature Sensor "A" Circuit High
      P1D74-450 FC Air Compressor Motor Inverter Temperature Sensor "A" Circuit Intermittent/Erratic
      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
      P1D7B-450 FC Air Compressor Motor "A" Temperature Sensor Circuit Correlation
      P107C-450 FC Air Compressor Motor "A" Temperature Sensor Circuit Low
      P1D7D-450 FC Air Compressor Motor "A" Temperature Sensor Circuit High
      P1D7E-450 FC Air Compressor Motor "A" Temperature Sensor Circuit Intermittent
      P1D80-451, 453, 455, 457 FC Air Compressor Motor "A" Phase V Current
      P1D81-452, 454, 456, 458 FC Air Compressor Motor "A" Phase W Current
      P1E22-450 Air Pressure Regulating Valve Phase A Circuit Low
      P1E23-450 Air Pressure Regulating Valve Phase A Circuit High
      P1E27-450 Air Pressure Regulating Valve Phase B Circuit Low
      P1E28-450 Air Pressure Regulating Valve Phase B Circuit High
      P1E2C-450 Air Shunt Valve Phase A Circuit Low
      P1E2D-450 Air Shunt Valve Phase A Circuit High
      P1E32-450 Air Shunt Valve Phase B Circuit Low
      P1E33-450 Air Shunt Valve Phase B Circuit High
      P2602-767 Oil Pump Control Circuit Low
      P2603-768 Oil Pump Control Circuit High
      System Malfunction P1D7F-472, 473 FC Air Compressor Speed Control Performance
      P1D82-459, 460, 461, 462, 463, 464, 465, 466, 467, 468, 469, 471 FC Air Compressor Motor Inverter Circuit
      P2601-777, 778, 779 Oil Pump Control Range / Performance

      Tech Tips

      DTC P1D7F-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

  2. CHECK FREEZE FRAME DATA


    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.


      Powertrain > FC > Trouble Codes

    5. Read the freeze frame data of DTC P1D7F-450.

      Confirmation Item
      FC Stack Air Pressure (FC Stack Inlet)
      Mass Air Flow Value
      Result
      Result Proceed to

      Either of the following conditions is met:


      • Mass Air Flow Value is less than 1000 NL/min and FC Stack Air Pressure (FC Stack Inlet) is more than 180 kPa.

      • Mass Air Flow Value is more than 1000 NL/min and FC Stack Air Pressure (FC Stack Inlet) is more than 210 kPa.

      		 A
      Other than the condition above B

    B

    CLEAR DTC Click here

    A

  3. SELECT CHECK MODE (CHECK MODE (AIR SYSTEM COMPONENT INSPECTION))

    Note


    • As the airflow volume will be decreased at areas of high elevation, the check mode (air system component inspection) judgment result will not be accurate. For this reason, check mode (air system component inspection) judgment should be performed at elevations below 1000 m (3280 ft.). If a DTC is output, use the pressure waveform data during testing to evaluate the results.

    • Conduct air system component inspection when "Smoothed Value of FC Stack Coolant Temperature (FC Stack Outlet)" in the Data List is over 10°C (50°F).


    1. Move the shift lever to P.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Powertrain / FC / Utility / Check Mode.


      Powertrain > FC > Utility
      Tester Display
      Check Mode

      Note


      • When changing between modes, the stored DTC and freeze frame data is erased, so save the detected data before changing modes.

      • Changing from normal mode to check mode function is not available when the power switch is turned on (READY).

    6. Enter the following menus: Powertrain / FC / Data List / Smoothed Value of FC Stack Air Pressure (FC Stack Inlet), Target Air Pressure Regulating Valve Position, Target Air Shunt Valve Position, Air Compressor Revolution


      Powertrain > FC > Data List
      Tester Display
      Smoothed Value of FC Stack Air Pressure (FC Stack Inlet)
      Target Air Pressure Regulating Valve Position
      Target Air Shunt Valve Position
      Air Compressor Revolution

    7. During check mode (air system component inspection), use the Snapshot function of the GTS to record the values of the Data List items listed above.

    8. Turn the power switch on (READY).

      Note

      The following conditions must be met for the Air System Component Inspection. If any one of the conditions is not met during inspection, the ongoing inspection will be canceled, and it will restart from the beginning when all conditions are satisfied again.


      • Shift lever in P

      • Power switch on (READY)

      • Air system component inspection is not yet completed

    9. Wait for 5 minutes.

      Note

      A GTS shows no indication that air system component inspection has finished.

      Result
      Proceed to
      NEXT

    NEXT

  4. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Check the data obtained during Check Mode (Air System Component Inspection), which was recorded with the snapshot.

      Figure 1. Reference waveforms of the Data List values in check mode (air system component inspection)

      B000ZJ2E10
      Result
      Result Proceed to
      Variation (B) of the "Smoothed Value of FC Stack Air Pressure (FC Stack Inlet)" value in the air shunt valve inspection section is less than 5 kPa (elevation 1000 m (3280 ft.) or less)*1 A
      Variation (A) of the "Smoothed Value of FC Stack Air Pressure (FC Stack Inlet)" value in the air pressure regulating valve inspection section is less than 5 kPa (elevation 1000 m (3280 ft.) or less)*2 B
      Other than above C

      • *1: The air shunt valve is malfunctioning

      • *2: The air pressure regulating valve is malfunctioning

    5. Turn the power switch off.


    A

    REPLACE FC STACK ASSEMBLY Click here

    B

    REPLACE FC STACK ASSEMBLY Click here

    C

    GO TO STEP 9 Click here

  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 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 8 Click here

    NG

  7. 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

  8. 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

    NG

    REPAIR OR REPLACE MALFUNCTIONING PARTS

    OK

  9. SIMULATION TEST


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (READY).

    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 P1D7F-450 is output B

    7. Turn the power switch off.


    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

    REPLACE FC AIR COMPRESSOR WITH MOTOR ASSEMBLY Click here