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 inverter water pump speed (measured value) signal to the power management control ECU (HV CPU). If the inverter water pump speed (measured value) signal is not sent to the power management control ECU (HV CPU) when the power switch is on (READY), this DTC is stored.

DTC No. INF Code DTC Detection Condition Trouble Area
P314A 828 The inverter water pump speed signal is not sent to the power management control ECU (HV CPU) when the power switch is turned on (READY).

  • Wire harness or connector

  • Power management control ECU

  • Inverter water pump assembly

  • IGCT NO. 3 fuse

Tech Tips


  • A malfunction (open, short to +B or short to ground) in the speed signal line from the inverter water pump assembly to the power management control (HV CPU) computer is detected.

  • A malfunction in the inverter water pump assembly power source circuit is detected.

  • A malfunction in the +B line or speed signal line to the inverter water pump assembly is detected.

  • A malfunction in the power management control ECU (HV CPU) power source circuit is detected.

Related Data List
DTC No. Data List Item
P314A-828

  • Inverter W/P Revolution

  • W/P Run Control Duty*1

  • Ready Signal

Related Active Test
DTC No. Data List Item
P314A-828 Activate the Water Pump*2

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 intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / DTC.

    4. Clear DTCs and freeze frame data.

    5. Turn the power switch off.


    NEXT

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (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 intelligent tester 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 assembly 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 (POWER MANAGEMENT CONTROL ECU CONNECTOR)


    1. Check the connections of the power management control ECU connectors.

      B001M45E01
      Text in Illustration
      *A for LHD *B for RHD
      OK
      The connectors are connected securely and there are no contact problems.

    NG

    CONNECT SECURELY

    OK

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


    1. A004XMV

      Check the connection of the inverter water pump assembly connector.

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

    NG

    CONNECT SECURELY

    OK

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


    1. Disconnect connector A19 from the power management control ECU.

    2. Disconnect connector e1 from the inverter water pump assembly.

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

      A004WVPE04
      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
      e1-2 (NWP) - A19-14 (NIWP) Power switch off Below 1 Ω
      e1-2 (NWP) or A19-14 (NIWP) -Body ground and other terminals Power 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

  6. CHECK POWER MANAGEMENT CONTROL ECU


    1. Disconnect connector e1 from the inverter water pump assembly.

    2. Turn the power switch on (IG).

    3. A004YWJE03
      Text in Illustration
      *a

      Component with harness connected

      (to Power Management Control ECU)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A19-14 (NIWP) - H3-6 (E1) Power switch on (IG) 11 to 14 V

    4. Turn the power switch off.

    5. Connect the inverter water pump assembly connector.


    NG

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    OK

  7. CLEAR DTC


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / DTC.

    4. Clear DTCs and freeze frame data.

    5. Turn the power switch off.


    NEXT

  8. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (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 intelligent tester 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. A004X00E03
      Text in Illustration
      *a

      Component with harness connected

      (Power Management Control ECU)

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

      Item Content
      Terminal A19-14 (NIWP) - H3-6 (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 POWER MANAGEMENT CONTROL ECU Click here

    NG

    REPLACE INVERTER WATER PUMP ASSEMBLY Click here

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


    1. A004XMV

      Check the connection of the inverter water pump assembly connector.

      OK
      The connector is connected securely and there are no contact 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 junction block assembly.

    2. Disconnect connector e1 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.

      A004WL9E04
      Text in Illustration
      *1 Engine Room 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) - e1-4 (+BWP) Power switch off Below 1Ω

      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.

      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 Junction Block Assembly

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

      A004WW9E03
      Text in Illustration
      *a Example
      *b Shake Slightly
      *c Vibrate Slightly

    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 e1 from the inverter water pump assembly.

    2. A004X7UE01
      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 Condition Specified Condition
      e1-1 (GND) - Body ground Power switch off Below 1Ω

    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. A004YBDE03
      Text in Illustration
      *1 Engine Room Junction Block Assembly
      *2 IGCT NO. 3 Fuse

      Remove the IGCT NO. 3 fuse from the engine room 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)

    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) Click here

    OK

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


    1. Remove the IGCT NO. 3 fuse from the engine room junction block assembly.

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

    3. Disconnect connector e1 from the inverter water pump assembly.

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

      A004VGRE04
      Text in Illustration
      *1 Engine Room 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) - e1- 4 (+BWP) Power switch off Below 1Ω
      1 (IGCT NO. 3 fuse) - 5 (IGCT relay) Power switch off Below 1Ω
      2 (IGCT NO. 3 fuse) or e1-4 (+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. A004YBDE03
      Text in Illustration
      *1 Engine Room Junction Block Assembly
      *2 IGCT NO. 3 Fuse

      Remove the IGCT NO. 3 fuse from the engine room 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

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

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


    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. A004YBDE03
      Text in Illustration
      *1 Engine Room Junction Block Assembly
      *2 IGCT NO. 3 Fuse

      Remove the IGCT NO. 3 fuse from the engine room 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. A004YBDE03
      Text in Illustration
      *1 Engine Room Junction Block Assembly
      *2 IGCT NO. 3 Fuse

      Remove the IGCT NO. 3 fuse from the engine room 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 e1 from the inverter water pump assembly.

    2. A004X7UE01
      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 Condition Specified Condition
      e1-1 (GND) - Body ground Power switch off Below 1Ω

    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)


    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 TERMINAL) Click here

    OK

  21. REPLACE INVERTER WATER PUMP ASSEMBLY


    1. Replace the inverter water pump assembly Click here.


    NEXT

    REPLACE FUSE (IGCT NO. 3)

  22. CHECK FUSE (IGCT NO. 3)


    1. A004YBDE03
      Text in Illustration
      *1 Engine Room Junction Block Assembly
      *2 IGCT NO. 3 Fuse

      Remove the IGCT NO. 3 fuse from the engine room 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 (IGCT NO. 3 FUSE HOLDER TERMINAL) Click here

  23. CONNECT 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 TERMINAL)


    NEXT

    REPLACE FUSE (IGCT NO. 3)