FC CONTROL SYSTEM, Diagnostic DTC:P1D92-450, P1D93-450

DTC Code DTC Name
P1D92-450 FC Stack Air Pressure Sensor (FC Stack Inlet) Circuit Low
P1D93-450 FC Stack Air Pressure Sensor (FC Stack Inlet) Circuit High

DESCRIPTION

Air that flows into the FC stack is compressed by the FC air compressor with motor assembly, and then cooled down by the intercooler. The FC stack inlet air pressure sensor (turbo pressure sensor) monitors pressure of the air, and converts it into a voltage.

The FC stack inlet air pressure sensor (turbo pressure sensor) measures pressure of the air flowing into the FC stack as absolute pressure, thus, it can measure the FC stack inlet air pressure without influence from changes in the atmospheric pressure due to altitude, etc.

A0026LSE01
DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate
P1D92-450 FC Stack Air Pressure Sensor (FC Stack Inlet) Circuit Low

If the FC air compressor speed is more than 1000 rpm and FC Stack Air Pressure Sensor (FC Stack Inlet) Voltage remains at less than 0.40 V for more than 3 seconds. This malfunction detection is actuated if the +B voltage is not low.

(1 trip detection logic)

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

  • FC control ECU

  • Wire harness or connector

 Master Warning Light: Comes on
P1D93-450 FC Stack Air Pressure Sensor (FC Stack Inlet) Circuit High

If the +B voltage is not low when the power switch is turned on (IG), FC Stack Air Pressure Sensor (FC Stack Inlet) Voltage remains at more than 4.65 V for more than 3 seconds.

(1 trip detection logic)

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

  • FC control ECU

  • Wire harness or connector

 Master Warning Light: Comes on
Detection timing: P1D92-450
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 - ○ - ○ ○ -
Detection timing: P1D93-450
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
P1D92-450 FC Stack Air Pressure Sensor (FC Stack Inlet) Voltage
P1D93-450

The following items can be helpful when performing repairs:


Tech Tips

If DTCs are found, read the "FC Stack Air Pressure Sensor (FC Stack Inlet) Voltage" in the Data List on a GTS.

FC Stack Air Pressure Sensor (FC Stack Inlet) Voltage Malfunction
Less than 0.40 V

  • Open in VAPF (5 V power supply) circuit

  • Short in APFC circuit to ground

  • Short in APFC circuit to GAPF (GND) circuit
Higher than 4.65 V

  • Short in VAPF circuit to APFC circuit

  • Open in APFC circuit

  • Open in GAPF (GND) circuit

Tech Tips

It is suspected that malfunctions, or open/short circuits have occurred in the FC stack inlet air pressure sensor (turbo pressure sensor).

WIRING DIAGRAM

A0026E5E03

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.


    P01D92-450

  1. Connect the GTS to the DLC3.

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

  3. Enter the following menus: Powertrain / FC / Active Test / FC Air Compressor

  4. Set the "FC Air Compressor" to 1500 rpm on the GTS, and then drive it for 5 seconds.


    P01D93-450

  1. Turn the power switch on (IG) and wait for 5 seconds or more.

PROCEDURE


  1. CHECK TERMINAL VOLTAGE (POWER SOURCE OF FC STACK INLET AIR PRESSURE SENSOR (TURBO PRESSURE SENSOR))


    1. A0026MN

      Disconnect the FC stack inlet air pressure sensor (turbo pressure sensor) connector.

    2. Turn the power switch on (IG).

    3. A0026HFC04
      *a

      Front view of wire harness connector

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

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D4-3 (VAPF) - D4-1 (GAPF) Power switch on (IG) 4.75 to 5.25 V
      D4-2 (APFC) - D4-1 (GAPF) Power switch on (IG) 4.935 to 5.065 V

    4. Turn the power switch off.

    5. Reconnect the FC stack inlet air pressure sensor (turbo pressure sensor) connector.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (FC CONTROL ECU - FC STACK INLET AIR PRESSURE SENSOR (TURBO PRESSURE SENSOR)) Click here

    OK

  2. REPLACE FC STACK INLET AIR PRESSURE SENSOR (TURBO PRESSURE SENSOR)

    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
      Result Proceed to
      P1D92-450 is output A
      P1D93-450 is output B

    B

    CHECK DTC OUTPUT Click here

    A

  4. 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.

    6. Enter the following menus: Powertrain / FC / Active Test / FC Air Compressor


      Powertrain > FC > Active Test
      Tester Display
      FC Air Compressor

    7. Set the "FC Air Compressor" to 1500 rpm on the GTS, and then drive it for 5 seconds.

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

    9. Check for DTCs.


      Powertrain > FC > Trouble Codes
      Result
      Result Proceed to
      DTC P1D92-450 is output A
      DTCs are not output B

    10. Turn the power switch off.


    A

    REPLACE FC CONTROL ECU Click here

    B

    END

  5. CHECK DTC OUTPUT


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG) and wait for 5 seconds or more.

    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
      DTC P1D93-450 is output A
      DTCs are not output B

    6. Turn the power switch off.


    A

    REPLACE FC CONTROL ECU Click here

    B

    END

  6. CHECK HARNESS AND CONNECTOR (FC CONTROL ECU - FC STACK INLET AIR PRESSURE SENSOR (TURBO PRESSURE SENSOR))


    1. Disconnect the FC control ECU connector.

    2. Disconnect the FC stack inlet air pressure sensor (turbo pressure sensor) connector.

    3. A0026H6C03
      *a

      Front view of wire harness connector

      (to FC Stack Inlet Air Pressure Sensor (Turbo Pressure Sensor))
      *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
      A47-65 (APFC) - D4-2 (APFC) Always Below 1 Ω
      A47-88 (GAPF) - D4-1 (GAPF) Always Below 1 Ω
      A47-111 (VAPF) - D4-3 (VAPF) Always Below 1 Ω
      A47-65 (APFC) or D4-2 (APFC) - Body ground and other terminals Always 10 kΩ or higher
      A47-111 (VAPF) or D4-3 (VAPF) - Body ground and other terminals Always 10 kΩ or higher

    4. Reconnect the FC control ECU connector.

    5. Reconnect the FC stack inlet air pressure sensor (turbo pressure sensor) connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FC CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR