HYBRID CONTROL SYSTEM, Diagnostic DTC:P314A-828

DTC Code DTC Name
P314A-828 Inverter Coolant Pump Speed Signal

DESCRIPTION

Refer to the description for DTC P0C73-776 Click here.

The inverter water pump assembly sends the water pump speed (measured value) signal to the hybrid vehicle control ECU. If the inverter water pump speed (measured value) signal is not sent to the hybrid vehicle control ECU when the power switch is on (READY), this DTC is stored.

DTC No. INF Code DTC Detection Condition Trouble Area
P314A 828

The water pump speed signal is not sent to the hybrid vehicle control ECU when the ignition switch is turned on (READY).*1

(1 trip detection logic)


  • Wire harness or connector

  • Hybrid vehicle control ECU

  • Inverter water pump assembly

  • IGCT NO. 3 fuse

  • IGCT relay


Related Data List
DTC No. Data List
P314A-828
  • Inverter W/P Revolution

  • (Inverter) W/P Run Control Duty

  • Ready Signal

Related Active Test
DTC No. Active Test
P314A-828 Activate the (Inverter) Water Pump

WIRING DIAGRAM

Refer to the wiring diagram for DTC P0C73-776 Click here.

CAUTION / NOTICE / HINT

Tech Tips

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


  1. Turn the ignition switch to ON (READY) and wait for 2 minutes or more.

PROCEDURE


  1. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

    4. Read and record the DTCs and freeze frame data.

    5. Clear DTCs and freeze frame data.

    6. Turn the ignition switch off.


    NEXT
  2. PERFORM ACTIVE TEST USING GTS (ACTIVATE THE (INVERTER) WATER PUMP)

    Note

    Be sure to perform the inspection with the auxiliary battery voltage at 11 V or more.

    Tech Tips

    When the auxiliary battery voltage is low, the inverter water pump assembly may not operate.


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Active Test / Activate the (Inverter) Water Pump.

    4. Perform the Activate the (Inverter) Water Pump Active Test.

    5. Touch the inverter water pump assembly and check that it is operating (vibrating).

      OK
      The inverter water pump is operating (vibrating).
    6. Turn the ignition switch off.


    NG
    OK
  3. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)


    1. A01V0I0E02
      Text in Illustration
      *A for LHD
      *B for RHD

      Check the connector connections and contact pressure of the relevant terminals for the hybrid vehicle control ECU connectors Click here.

      OK
      The connectors are connected securely and there are no contact pressure problems.

    NG
    OK
  4. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WATER PUMP ASSEMBLY CONNECTOR)


    1. A01UY5T

      Check the connector connections and contact pressure of the relevant terminals for the inverter water pump assembly connector Click here.

      OK
      The connectors are connected securely and there are no contact pressure problems.

    NG
    OK
  5. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WATER PUMP ASSEMBLY)


    1. Disconnect the hybrid vehicle control ECU connector.

    2. Disconnect the inverter water pump assembly connector.

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

      A01UXXLE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Hybrid Vehicle Control ECU)

      *b

      Front view of wire harness connector

      (to Inverter Water Pump Assembly)

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A26-14 (NIWP) - A36-2 (NWP) Ignition switch off Below 1 Ω
      A26-14 (NIWP) or A36-2 (NWP) -Body ground and other terminals Ignition switch off 10 kΩ or higher
    4. Connect the hybrid vehicle control ECU connector.

    5. Connect the inverter water pump assembly connector.


    NG
    OK
  6. CHECK HYBRID VEHICLE CONTROL ECU


    1. Disconnect the inverter water pump assembly connector.

    2. Turn the ignition switch to ON (IG).

    3. A01V0EJE02
      Text in Illustration
      *a

      Component with harness connected

      (Hybrid Vehicle Control ECU)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A26-14 (NIWP) - F55-6 (E1) Ignition switch ON (IG) 11 to 14 V
    4. Turn the ignition switch off.

    5. Connect the inverter water pump assembly connector.


    NG
    OK
  7. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

    4. Read and record the DTCs and freeze frame data.

    5. Clear DTCs and freeze frame data.

    6. Turn the ignition switch off.


    NEXT
  8. PERFORM ACTIVE TEST USING GTS (ACTIVATE THE (INVERTER) WATER PUMP)

    Note

    Be sure to perform the inspection with the auxiliary battery voltage at 11 V or more.

    Tech Tips

    When the auxiliary battery voltage is low, the inverter water pump assembly may not operate.


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Active Test / Activate the (Inverter) Water Pump.

    4. Perform the "Activate the (Inverter) Water Pump" Active Test.

    5. A01UXOOE02
      Text in Illustration
      *a

      Component with harness connected

      (Hybrid Vehicle Control ECU)

      Connect an oscilloscope between the hybrid vehicle control ECU terminals specified in the table below, and measure the waveform.

      Item Content
      Terminal A26-14 (NIWP) - F55-6 (E1)
      Equipment Setting 5 V/DIV., 100 ms./DIV.
      Condition Ignition switch ON (IG), during Active Test
      OK
      The duration of wavelength A is 300 msec or less.
    6. Turn the ignition switch off.


    OK
    NG
  9. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WATER PUMP ASSEMBLY CONNECTOR)


    1. A01UY5T

      Check the connector connections and contact pressure of the relevant terminals for the inverter water pump assembly connector Click here.

      OK
      The connectors are connected securely and there are no contact pressure problems.

    NG
    OK
  10. CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP ASSEMBLY - IGCT RELAY)


    1. Remove the IGCT relay from the No. 2 engine room relay block.

    2. Disconnect the inverter water pump assembly connector.

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

      A01UYOYE02
      Text in Illustration
      *1 No. 2 Engine Room Relay Block *2 IGCT Relay
      *a

      Front view of wire harness connector

      (to Inverter Water Pump Assembly)

      - -
      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A36-4 (+BWP) - 5 (IGCT relay) Ignition switch off Below 1 Ω

      Tech Tips


      • Connectors

        Slightly shake the connector vertically and horizontally.

      • Wire Harness

        Slightly shake the wire harness vertically and horizontally.

        The connector joint and fulcrum of the vibration are the major areas that should be checked thoroughly.

      • No. 2 Engine Room Relay Block

        Apply slight vibration with a finger to the No. 2 engine room relay block and check whether a malfunction occurs.

      • A01UXIYE02

        IGCT NO. 3 Fuse

        Apply slight vibration with a finger to the IGCT NO. 3 fuse and check whether a malfunction occurs.

        Text in Illustration
        *a Example
        *b Shake Slightly
        *c Vibrate Slightly

      Note

      Do not apply excessive force when using the probes of the tester to perform the inspection. If excessive force is used, the terminals will be damaged.

    4. Install the IGCT relay.

    5. Connect the inverter water pump assembly connector.


    NG
    OK
  11. CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP ASSEMBLY - BODY GROUND)


    1. Disconnect connector from the inverter water pump assembly.

    2. A01V04HE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Inverter Water Pump Assembly)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A36-1 (GND) - Body ground Ignition switch off Below 1 Ω
      Result
      Result Proceed to
      NG A
      OK B
    3. Connect the inverter water pump assembly connector.


    A
    B
  12. CHECK FUSE (IGCT NO. 3)


    1. A01V1FKE01
      Text in Illustration
      *1 No. 2 Engine Room Relay Block
      *2 IGCT NO. 3 Fuse

      Remove the IGCT NO. 3 fuse from the No. 2 engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      IGCT NO. 3 fuse Always Below 1Ω
    3. Install the IGCT NO. 3 fuse.


    OK
    NG
  13. CHECK INSTALLATION CONDITION (IGCT NO. 3 FUSE)


    1. Check the terminals of the IGCT NO. 3 fuse holder.

      OK
      The terminals of the IGCT NO. 3 fuse holder are not bent, loose or corroded.

    NG
    OK
  14. CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP ASSEMBLY CIRCUIT)


    1. Remove the IGCT NO. 3 fuse from the No. 2 engine room relay block.

    2. Remove the IGCT relay from the No. 2 engine room relay block.

    3. Disconnect the inverter water pump assembly connector.

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

      A01UZ80E02
      Text in Illustration
      *1 No. 2 Engine Room Relay Block *2 IGCT NO. 3 Fuse Holder
      *3 IGCT Relay Holder - -
      *a

      Front view of wire harness connector

      (to Inverter Water Pump Assembly)

      - -
      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A36-4 (+BWP) - 2 (IGCT NO. 3 fuse holder) Ignition switch off Below 1 Ω
      1 (IGCT NO. 3 fuse holder) - 5 (IGCT relay holder) Ignition switch off Below 1 Ω
      A36-4 (+BWP) or 2 (IGCT NO. 3 fuse holder) - Body ground and other terminals Ignition switch off 10 kΩ or higher

      Note

      Do not apply excessive force when using the probes of the tester to perform the inspection. If excessive force is used, the terminals will be damaged.

    5. Install the IGCT NO. 3 fuse.

    6. Install the IGCT relay.

    7. Connect the inverter water pump assembly connector.


    NG
    OK
  15. CHECK FUSE (IGCT NO. 3)


    1. A01V1FKE01
      Text in Illustration
      *1 No. 2 Engine Room Relay Block
      *2 IGCT NO. 3 Fuse

      Remove the IGCT NO. 3 fuse from the No. 2 engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      IGCT NO. 3 fuse Always Below 1Ω
    3. Install the IGCT NO. 3 fuse.


    OK
    NG
  16. CHECK FUSE HOLDER TERMINAL (IGCT NO. 3 FUSE)


    1. Check the terminals of the IGCT NO. 3 fuse holder.

      OK
      The terminals of the IGCT NO. 3 fuse holder are not bent, loose or corroded.

    NG
    OK
  17. CHECK FUSE (IGCT NO. 3)


    1. A01V1FKE01
      Text in Illustration
      *1 No. 2 Engine Room Relay Block
      *2 IGCT NO. 3 Fuse

      Remove the IGCT NO. 3 fuse from the No. 2 engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      IGCT NO. 3 fuse Always Below 1Ω
    3. Install the IGCT NO. 3 fuse.


    OK
    NG
  18. CHECK FUSE (IGCT NO. 3)


    1. A01V1FKE01
      Text in Illustration
      *1 No. 2 Engine Room Relay Block
      *2 IGCT NO. 3 Fuse

      Remove the IGCT NO. 3 fuse from the No. 2 engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      IGCT NO. 3 fuse Always Below 1Ω
    3. Install the IGCT NO. 3 fuse.


    OK
    NG
  19. CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP ASSEMBLY - BODY GROUND)


    1. Disconnect connector from the inverter water pump assembly.

    2. A01V1D1E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Inverter Water Pump Assembly)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A36-1 (GND) - Body ground Ignition switch off 10 kΩ or higher
    3. Connect the inverter water pump assembly connector.


    NG
    OK
  20. CHECK FUSE HOLDER TERMINAL (IGCT NO. 3 FUSE)


    1. Check the terminals of the IGCT NO. 3 fuse holder.

      OK
      The terminals of the IGCT NO. 3 fuse holder are not bent, loose or corroded.

    NG
    OK
  21. REPLACE INVERTER WATER PUMP ASSEMBLY


    1. Replace the inverter water pump assembly Click here.


    NEXT
  22. CHECK FUSE (IGCT NO. 3)


    1. A01V1FKE01
      Text in Illustration
      *1 No. 2 Engine Room Relay Block
      *2 IGCT NO. 3 Fuse

      Remove the IGCT NO. 3 fuse from the No. 2 engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      IGCT NO. 3 fuse Always Below 1Ω
    3. Install the IGCT NO. 3 fuse.


    OK
    NG
  23. CONNECT SECURELY


    1. Connect the inverter water pump assembly connector securely.


    NEXT
  24. REPAIR OR REPLACE HARNESS OR CONNECTOR


    NEXT
  25. REPAIR OR REPLACE HARNESS OR CONNECTOR (IGCT NO. 3 FUSE HOLDER TERMINAL)


    NEXT
  26. REPLACE INVERTER WATER PUMP ASSEMBLY

    Replace the inverter water pump assembly Click here.


    NEXT
  27. ADD HV COOLANT AND PERFORM AIR BLEEDING


    1. After replacing the inverter water pump assembly, add HV coolant and perform air bleeding Click here.


    NEXT
  28. ADD HV COOLANT AND PERFORM AIR BLEEDING


    1. After replacing the inverter water pump assembly, add HV coolant and perform air bleeding Click here.


    NEXT