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 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

    When either of the following conditions is met:

  • A malfunction in the power source circuit or water pump speed signal line of the inverter water pump assembly is detected.

  • A malfunction in the power source circuit of the inverter water pump assembly or hybrid vehicle control ECU is detected.

(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. INF Code Data List Item
P314A 828

  • Inverter W/P Revolution*1

  • W/P Run Control Duty*1

  • Ready Signal

*1: This Data List item is related to the inverter water pump assembly.

Related Active Test
DTC No. INF Code Active Test
P314A 828 Activate the Water Pump*2

*2: This is an Active Test of the inverter water pump assembly.

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 power switch on (READY) and wait for 120 seconds or more.

PROCEDURE


  1. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

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

    4. Clear DTCs and freeze frame data.

    5. Turn the power switch off.


    NEXT

  2. 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 power switch 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 power switch off.


    NG

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

    OK

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


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

      B005ZP3E01
      Text in Illustration
      *A for LHD *B for RHD
      OK
      The connectors are connected securely and there are no contact pressure problems.

    NG

    CONNECT SECURELY

    OK

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


    1. A005BDE

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

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

    NG

    CONNECT SECURELY

    OK

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


    1. Disconnect the A21 hybrid vehicle control ECU connector.

    2. Disconnect the g1 inverter water pump assembly connector.

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

      A005DLFE03
      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 Condition Specified Condition
      g1-2 (NWP) - A21-14 (NIWP) Power switch off Below 1 Ω
      g1-2 (NWP) or A21-14 (NIWP) -Body ground and other terminals Power switch off 10 kΩ or higher

    4. Reconnect the A21 hybrid vehicle control ECU connector.

    5. Reconnect the g1 inverter water pump assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HYBRID VEHICLE CONTROL ECU


    1. Disconnect the g1 inverter water pump assembly connector.

    2. Turn the power switch on (IG).

    3. A005CTAE04
      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 Condition Specified Condition
      A21-14 (NIWP) - L5-6 (E1) Power switch on (IG) 11 to 14 V

    4. Turn the power switch off.

    5. Reconnect the g1 inverter water pump assembly connector.


    NG

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    OK

  7. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

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

    4. Clear DTCs and freeze frame data.

    5. Turn the power switch off.


    NEXT

  8. 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 power switch 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. A005BT5E03
      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 A21-14 (NIWP) - L5-6 (E1)
      Equipment Setting 5 V/DIV., 100 ms./DIV.
      Condition Power switch on (IG), during Active Test
      OK
      The duration of wavelength A is 300 msec or less.

    6. Turn the power switch off.


    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    NG

    REPLACE INVERTER WATER PUMP ASSEMBLY Click here

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


    1. A005BDE

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

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

    NG

    CHECK FUSE (IGCT NO. 3) Click here

    OK

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


    1. Remove the IGCT relay from the engine room relay block and junction block assembly.

    2. Disconnect connector g1 from the inverter water pump assembly.

    3. While slightly shaking the wire harness, connector and engine room relay block and junction block assembly, measure the resistance according to the value(s) in the table below.

      A005BJ3E02
      Text in Illustration
      *1 Engine Room Relay Block and Junction Block Assembly *2 IGCT Relay
      *a

      Front view of wire harness connector

      (to Inverter Water Pump Assembly)

      		 - -
      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      5 (IGCT relay) - g1-4 (+BWP) Power 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.

      • Engine Room Relay Block and Junction Block Assembly

        Apply slight vibration with a finger to the engine room relay block and junction block assembly and check whether a malfunction occurs.

      A0059TYE02
      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

    CHECK INSTALLATION CONDITION (IGCT NO. 3 FUSE) Click here

    OK

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


    1. Disconnect connector g1 from the inverter water pump assembly.

    2. A005B81E03
      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
      g1-1 (GND) - Body ground Power switch off Below 1 Ω

    3. Connect the inverter water pump assembly connector.


    OK

    REPLACE INVERTER WATER PUMP ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  12. CHECK FUSE (IGCT NO. 3)


    1. A005EU8E02
      Text in Illustration
      *1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT No. 3 Fuse

      Remove the IGCT No. 3 fuse from the engine room relay block and junction block assembly.

    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

    CONNECT SECURELY (INVERTER WATER PUMP ASSEMBLY CONNECTOR)

    NG

    CONNECT SECURELY Click here

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


    1. Check installation condition of the IGCT No. 3 fuse.

      OK
      IGCT No. 3 fuse is installed correctly.

    NG

    CHECK FUSE HOLDER TERMINAL (IGCT NO. 3 FUSE) Click here

    OK

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


    1. Remove the IGCT No. 3 fuse from the engine room relay block and junction block assembly.

    2. Remove the IGCT relay from the engine room relay block and junction block assembly.

    3. Disconnect connector g1 from the inverter water pump assembly.

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

      A005AOOE02
      Text in Illustration
      *1 Engine Room Relay Block and Junction Block Assembly *2 IGCT No. 3 Fuse
      *3 IGCT Relay - -
      *a

      Front view of wire harness connector

      (to Inverter Water Pump Assembly)

      		 - -
      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      2 (IGCT No. 3 fuse) - g1-4 (+BWP) Power switch off Below 1 Ω
      1 (IGCT No. 3 fuse) - 5 (IGCT relay) Power switch off Below 1 Ω
      2 (IGCT No. 3 fuse) or g1-4 (+BWP) - Body ground and other terminals Power 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

    CHECK FUSE (IGCT NO. 3) Click here

    OK

  15. CHECK FUSE (IGCT NO. 3)


    1. A005EU8E02
      Text in Illustration
      *1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT No. 3 Fuse

      Remove the IGCT No. 3 fuse from the engine room relay block and junction block assembly.

    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

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IGCT NO. 3 FUSE HOLDER TERMINALS)

    NG

    CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP ASSEMBLY - BODY GROUND) Click here

  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

    CHECK FUSE (IGCT NO. 3) Click here

    OK

  17. CHECK FUSE (IGCT NO. 3)


    1. A005EU8E02
      Text in Illustration
      *1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT No. 3 Fuse

      Remove the IGCT No. 3 fuse from the engine room relay block and junction block assembly.

    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

    CONNECT SECURELY (IGCT NO. 3 FUSE)

    NG

    REPLACE FUSE (IGCT NO. 3)

  18. CHECK FUSE (IGCT NO. 3)


    1. A005EU8E02
      Text in Illustration
      *1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT No. 3 Fuse

      Remove the IGCT No. 3 fuse from the engine room relay block and junction block assembly.

    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

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

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


    1. Disconnect connector g1 from the inverter water pump assembly.

    2. A005B81E03
      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
      g1-1 (GND) - Body ground Power switch off Below 1 Ω

    3. Connect the inverter water pump assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    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

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IGCT NO. 3 FUSE HOLDER TERMINALS) Click here

    OK

  21. REPLACE INVERTER WATER PUMP ASSEMBLY

    Click here


    NEXT

    REPLACE FUSE (IGCT NO. 3)

  22. CHECK FUSE (IGCT NO. 3)


    1. A005EU8E02
      Text in Illustration
      *1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT No. 3 Fuse

      Remove the IGCT No. 3 fuse from the engine room relay block and junction block assembly.

    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

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IGCT NO. 3 FUSE HOLDER TERMINALS)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IGCT NO. 3 FUSE HOLDER TERMINALS) Click here

  23. CONNECT SECURELY


    1. Connect the inverter water pump assembly connector securely.


    NEXT

    REPLACE FUSE (IGCT NO. 3)

  24. REPAIR OR REPLACE HARNESS OR CONNECTOR


    NEXT

    REPLACE FUSE (IGCT NO. 3)

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


    NEXT

    REPLACE FUSE (IGCT NO. 3)