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.

DTC No. INF Code DTC Detection Condition Trouble Area
P314A 828 Open in the water pump speed signal line or water pump power source circuit.

  • Wire harness or connector

  • Power management control ECU

  • Inverter water pump assembly

  • IGCT NO. 3 fuse

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. PERFORM ACTIVE TEST USING GTS (ACTIVATE THE 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 Water Pump.

    4. Perform the Activate the 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

    CHECK FUSE (IGCT NO. 3) Click here

    OK

  2. CHECK CONNECTOR CONNECTION CONDITION (POWER MANAGEMENT CONTROL ECU CONNECTOR)


    1. A01V0I0E01
      Text in Illustration
      *A for LHD
      *B for RHD

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

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

    NG

    CONNECT SECURELY

    OK

  3. 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.

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

    NG

    CONNECT SECURELY

    OK

  4. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INVERTER WATER PUMP ASSEMBLY)


    1. Disconnect the power management control ECU connector.

    2. Disconnect the inverter water pump assembly connector.

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

      A01UZVJE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management 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
      A26-13 (IWP) - A36-3 (SWP) 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
      A26-13 (IWP) or A36-3 (SWP) - Body ground and other terminals Ignition switch off 10 kΩ or higher

    4. Connect the power management control ECU connector.

    5. Connect the inverter water pump assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK POWER MANAGEMENT CONTROL ECU


    1. Disconnect connector A36 from the inverter water pump assembly.

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

    3. A01V11RE02
      Text in Illustration
      *a

      Component with harness connected

      (Power Management 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

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

  6. PERFORM ACTIVE TEST USING GTS (ACTIVATE THE 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 Water Pump.

    4. A01UZNQE02
      Text in Illustration
      *a

      Component with harness connected

      (Power Management Control ECU)
      *b Waveform cycle

      Connect an oscilloscope between the power management control ECU terminals specified in the following table.

    5. While performing the "Activate the Water Pump" Active Test, Check the waveform between the power management control ECU terminals.

      Result
      Item Content
      Terminal A26-14 (NIWP) - F55-6 (E1)
      Equipment Setting 5 V/DIV., 100 ms./DIV.
      Condition Ignition switch ON (IG)
      OK
      Waveform cycle is 0.3 seconds or less.

    6. Turn the ignition switch off.


    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    NG

    REPLACE INVERTER WATER PUMP ASSEMBLY Click here

  7. 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.


    NG

    CHECK CONNECTOR CONNECTION CONDITION (INVERTER WATER PUMP ASSEMBLY CONNECTOR) Click here

    OK

  8. 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.

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

    NG

    CONNECT SECURELY

    OK

  9. 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 power management control ECU connector.

    4. Disconnect the inverter water pump assembly connector.

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

      A01UY9VE01
      Text in Illustration
      *1 No. 2 Engine Room Relay Block *2 IGCT Relay
      *3 IGCT NO. 3 Fuse - -
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      		 *b

      Front view of wire harness connector

      (to Inverter Water Pump Assembly)
      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      2 (IGCT NO. 3 fuse) - A36-4 (+BWP) Ignition switch off Below 1 Ω
      1 (IGCT NO. 3 fuse) - 5 (IGCT relay) Ignition switch off Below 1 Ω
      A26-14 (NIWP) - A36-2 (NWP) Ignition switch off Below 1 Ω
      A26-13 (IWP) - A36-3 (SWP) Ignition switch off Below 1 Ω
      A36-1 (GND) - Body ground Ignition switch off Below 1 Ω
      2 (IGCT NO. 3 fuse) or A36-4 (+BWP) - Body ground and other terminals Ignition switch off 10 kΩ or higher
      1 (IGCT NO. 3 fuse) or 5 (IGCT relay) - Body ground and other terminals Ignition switch off 10 kΩ or higher
      A26-14 (NIWP) or A36-2 (NWP) - Body ground and other terminals Ignition switch off 10 kΩ or higher
      A26-13 (IWP) or A36-3 (SWP) - 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.

    6. Install the IGCT NO. 3 fuse.

    7. Install the IGCT relay.

    8. Connect the power management control ECU connector.

    9. Connect the inverter water pump assembly connector.


    OK

    REPLACE INVERTER WATER PUMP ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. 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.

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

    NG

    CONNECT SECURELY Click here

    OK

  11. 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. Disconnect the inverter water pump assembly connector.

    3. A01V0WPE01
      Text in Illustration
      *1 No. 2 Engine Room Relay Block
      *2 IGCT NO. 3 Fuse
      *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
      2 (IGCT NO. 3 fuse) or A36-4 (+BWP) - 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.

    4. Install the IGCT NO. 3 fuse.

    5. Connect the inverter water pump assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  12. REPLACE INVERTER WATER PUMP ASSEMBLY

    Click here


    NEXT

    REPLACE FUSE (IGCT NO. 3)

  13. CONNECT SECURELY


    1. Connect the inverter water pump assembly connector securely.


    NEXT

    REPLACE FUSE (IGCT NO. 3)

  14. REPAIR OR REPLACE HARNESS OR CONNECTOR


    NEXT

    REPLACE FUSE (IGCT NO. 3)