FC CONTROL SYSTEM, Diagnostic DTC:P1DD5-450

DTC Code DTC Name
P1DD5-450 Radiator Rotary Valve Circuit

DESCRIPTION

The FC control ECU regulates the FC cooling water temperature control valve so as to maintain the FC stack coolant temperature at a specified level. In order to obtain an appropriate FC stack coolant temperature for the FC stack power generation, the FC control ECU switches the direction of the coolant passage to the bypass side if the FC stack coolant temperature is below a target temperature, or to the radiator if the temperature is above a target.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate
P1DD5-450 Radiator Rotary Valve Circuit

While the FC Mode is in FC Working and each of the 4 terminals of the FC cooling water temperature control valve step motor is OFF, an error has occurred for more than 1 second.

(1 trip detection logic)

  • FC cooling water temperature control valve

  • FC control ECU

  • FC PWR relay

  • 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
P1DD5-450 Estimated Radiator Rotary Valve Position
Related Active Test
DTC No. Active Test
P1DD5-450 Radiator Rotary Valve

WIRING DIAGRAM

A01MJ9NE04

CAUTION / NOTICE / HINT

Note


  • Inspect the fuses of circuits related to this system before performing the following procedure.

  • 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. Connect the GTS to the DLC3.

  2. Turn the power switch on (IG).

  3. Turn the power switch on (READY) with the shift lever in P.

  4. Enter the following menus: Powertrain / FC / Active Test / Radiator Rotary Valve

  5. Perform the Active Test (switching between 0% and 100%).

PROCEDURE


  1. CHECK TERMINAL VOLTAGE (POWER SOURCE OF FC COOLING WATER TEMPERATURE CONTROL VALVE)


    1. A01MFVP

      Disconnect the FC cooling water temperature control valve connector.

    2. Turn the power switch on (IG).

    3. A01MGBYC03
      *a

      Front view of wire harness connector

      (to FC Cooling Water Temperature Control Valve)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E2-5 (+B1) or E2-2 (+B2) - Body ground Power switch on (IG) 11 to 14 V

    4. Turn the power switch off.

    5. Reconnect the FC cooling water temperature control valve connector.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (FC COOLING WATER TEMPERATURE CONTROL VALVE - FC PWR RELAY) Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (FC CONTROL ECU - FC COOLING WATER TEMPERATURE CONTROL VALVE)


    1. Disconnect the FC control ECU connector.

    2. Disconnect the FC cooling water temperature control valve connector.

    3. A01MHSZC01
      *a

      Front view of wire harness connector

      (to FC Cooling Water Temperature Control Valve)
      *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
      A48-32 (WRA1) - E2-4 (WRA1) Always Below 1 Ω
      A48-51 (WRA2) - E2-6 (WRA2) Always Below 1 Ω
      A48-31 (WRB1) - E2-1 (WRB1) Always Below 1 Ω
      A48-50 (WRB2) - E2-3 (WRB2) Always Below 1 Ω
      A48-32 (WRA1) or E2-4 (WRA1) - Body ground and other terminals Always 10 kΩ or higher
      A48-51 (WRA2) or E2-6 (WRA2) - Body ground and other terminals Always 10 kΩ or higher
      A48-31 (WRB1) or E2-1 (WRB1) - Body ground and other terminals Always 10 kΩ or higher
      A48-50 (WRB2) or E2-3 (WRB2) - Body ground and other terminals Always 10 kΩ or higher

    4. Reconnect the FC cooling water temperature control valve connector.

    5. Reconnect the FC control ECU connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT FC COOLING WATER TEMPERATURE CONTROL VALVE

    Click here

    Result
    Proceed to
    OK
    NG

    NG

    REPLACE FC COOLING WATER TEMPERATURE CONTROL VALVE Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (FC CONTROL ECU - BODY GROUND)


    1. Disconnect the FC control ECU connector.

    2. B000ZH2C02
      *a

      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
      A47-45 (E01) - Body ground Always Below 1 Ω

    3. Reconnect the FC control ECU connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FC CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. CHECK HARNESS AND CONNECTOR (FC COOLING WATER TEMPERATURE CONTROL VALVE - FC PWR RELAY)


    1. Disconnect the FC control ECU connector.

    2. Remove the FC PWR relay from the motor compartment relay block.

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

      A01MHWQC02
      *1 Motor Compartment Relay Block *2 FC PWR Relay Holder
      *a

      Front view of wire harness connector

      (to FC Cooling Water Temperature Control Valve)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      E2-5 (+B1) or E2-2 (+B2) - 5 (FC PWR relay holder) Always Below 1 Ω
      E2-5 (+B1), E2-2 (+B2) or 5 (FC PWR relay holder) - Body ground and other terminals Always 10 kΩ or higher

    4. Reinstall the FC PWR relay.

    5. Reconnect the FC control ECU connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK TERMINAL VOLTAGE (POWER SOURCE OF FC PWR RELAY)


    1. B000ZHDC01
      *1 Motor Compartment Relay Block
      *2 FC PWR Relay Holder

      Remove the FC PWR relay from the motor compartment relay block.

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      1 (FC PWR relay holder) - Body ground Power switch on (IG) 11 to 14 V

    4. Turn the power switch off.

    5. Reinstall the FC PWR relay.

      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (FC-IGCT RELAY - FC PWR RELAY) Click here

    OK

  7. INSPECT RELAY (FC PWR)

    Click here

    Result
    Proceed to
    OK
    NG

    NG

    REPLACE RELAY (FC PWR)

    OK

  8. CHECK TERMINAL VOLTAGE (POWER SOURCE OF FC PWR RELAY)


    1. B000ZHDC02
      *1 Motor Compartment Relay Block
      *2 FC PWR Relay Holder

      Remove the FC PWR relay from the motor compartment relay block.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      3 (FC PWR relay holder) - Body ground Power switch off 11 to 14 V

    3. Reinstall the FC PWR relay.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FC PWR RELAY - AUXILIARY BATTERY)

    OK

  9. CHECK HARNESS AND CONNECTOR (FC PWR RELAY - BODY GROUND)


    1. Remove the FC PWR relay from the motor compartment relay block.

    2. B000ZHDC03
      *1 Motor Compartment Relay Block
      *2 FC PWR Relay Holder

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (FC PWR relay holder) - Body ground Always Below 1 Ω

    3. Reinstall the FC PWR relay.

      Result
      Proceed to
      OK
      NG

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. CHECK HARNESS AND CONNECTOR (FC-IGCT RELAY - FC PWR RELAY)


    1. Remove the FC-IGCT relay from the motor compartment relay block.

    2. Remove the FC PWR relay from the motor compartment relay block.

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

      B000ZSUC01
      *1 Motor Compartment Relay Block *2 FC-IGCT Relay Holder
      *3 FC PWR Relay Holder - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (FC-IGCT relay holder) - 1 (FC PWR relay holder) Always Below 1 Ω
      3 (FC-IGCT relay holder) or 1 (FC PWR relay holder) - Body ground and other terminals Always 10 kΩ or higher

    4. Reinstall the FC PWR relay.

    5. Reinstall the FC-IGCT relay.

      Result
      Proceed to
      OK
      NG

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR