HYBRID CONTROL SYSTEM, Diagnostic DTC:P314A-828

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

DESCRIPTION

The inverter water pump assembly sends the water pump speed (measured value) signal to the power management control ECU.

If the water pump speed (measured value) signal is not sent to the power management 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 power management control ECU is detected.

(1 trip detection logic)

  • Wire harness or connector

  • Power management control ECU

  • Inverter water pump assembly

  • INV W/P fuse

  • IGCT MAIN Relay
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. Active Test
P314A-828 Activate the Water Pump*2

WIRING DIAGRAM

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

INSPECTION PROCEDURE

Note

If DTC P0A78-284, 286, P0A79-692, 696, P0A7A-322, 324, P0A94-553 or 557 is output, replace the inverter with converter assembly after this inspection.

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 2 minutes 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 / Trouble Codes.

    4. Clear DTCs and freeze frame data.


    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

    Click here

    OK

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


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

      A01NJQWE01
      Text in Illustration
      *1 for LHD *2 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. A01NLPZ

      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 A80 from the power management control ECU.

    2. Disconnect connector A73 from the inverter water pump assembly.

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

      A01NIO2E22
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      		 *2

      Front view of wire harness connector

      (to Inverter Water Pump Assembly)
      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A73-2 (NWP) - A80-14 (NIWP) Power switch off Below 1 Ω
      A73-2 (NWP) or A80-14 (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 A73 from the inverter water pump assembly.

    2. Turn the power switch on (IG).

    3. A01NMFME26
      Text in Illustration
      *1

      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
      A80-14 (NIWP) - F97-6 (E1) Power switch on (IG) 11 to 14 V
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    4. Turn the power switch off.

    5. Connect the inverter water pump assembly connector.


    B

    REPLACE POWER MANAGEMENT CONTROL ECU (for LHD) Click here

    C

    REPLACE POWER MANAGEMENT CONTROL ECU (for RHD) Click here

    A

  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 / Trouble Codes.

    4. Clear DTCs and freeze frame data.


    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. A01NJ6IE12
      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 A80-14 (NIWP) - F97-6 (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.
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    6. Turn the power switch off.


    B

    REPLACE POWER MANAGEMENT CONTROL ECU (for RHD) Click here

    C

    REPLACE INVERTER WATER PUMP ASSEMBLY Click here

    A

    REPLACE POWER MANAGEMENT CONTROL ECU (for LHD) Click here

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


    1. A01NLPZ

      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 (INV W/P) Click here

    OK

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


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

    2. Disconnect connector A73 from the inverter water pump assembly.

    3. A01NMM0E01
      Text in Illustration
      *1 Engine Room Relay Block No. 2
      *2 IGCT MAIN Relay
      *3

      Front view of wire harness connector

      (to Inverter Water Pump Assembly)
      A01NK55E01
      Text in Illustration
      *a Example
      *b Shake Slightly
      *c Vibrate Slightly

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      3 (IGCT MAIN relay) - A73-4 (+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 Relay Block No. 2

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

    4. Install the IGCT MAIN relay.

    5. Connect the inverter water pump assembly connector.


    NG

    CHECK INSTALLATION CONDITION (INV W/P FUSE) Click here

    OK

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


    1. Disconnect the A73 inverter water pump assembly connector.

    2. A01NK4SE11
      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
      A73-1 (GND) - Body ground Power switch off Below 1 Ω

    3. Reconnect the A73 inverter water pump assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE INVERTER WATER PUMP ASSEMBLY Click here

  12. CHECK FUSE (INV W/P)


    1. A01NN0SE03
      Text in Illustration
      *1 Engine Room Relay Block No. 2
      *2 INV W/P Fuse

      Remove the INV W/P fuse from the engine room relay block No. 2.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      INV W/P fuse Always Below 1Ω

    3. Install the INV W/P fuse.


    NG

    REPLACE FUSE (INV W/P) Click here

    OK

    CONNECT SECURELY (INVERTER WATER PUMP ASSEMBLY CONNECTOR)

  13. REPLACE FUSE (INV W/P)


    NEXT

    CONNECT SECURELY (INVERTER WATER PUMP ASSEMBLY CONNECTOR)

  14. CHECK INSTALLATION CONDITION (INV W/P FUSE)


    1. A01NN0SE03
      Text in Illustration
      *1 Engine Room Relay Block No. 2
      *2 INV W/P Fuse

      Check installation condition of the INV W/P fuse.

      OK
      INV W/P fuse is installed correctly.

    NG

    CHECK FUSE HOLDER TERMINAL (INV W/P FUSE) Click here

    OK

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


    1. Remove the INV W/P fuse from the engine room relay block No. 2.

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

    3. Disconnect connector A73 from the inverter water pump assembly.

    4. A01NKJAE01
      Text in Illustration
      *1 Engine Room Relay Block No. 2
      *2 IGCT MAIN Relay
      *3 INV W/P Fuse
      *4

      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 (INV W/P fuse) - A73-4 (+BWP) Power switch off Below 1 Ω
      1 (INV W/P fuse) - 3 (IGCT MAIN relay) Power switch off Below 1 Ω
      2 (INV W/P fuse) or A73-4 (+BWP) - Body ground and other terminals Power switch off 10kΩ 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 INV W/P fuse.

    6. Install the IGCT MAIN relay.

    7. Connect the inverter water pump assembly connector.


    NG

    CHECK FUSE (INV W/P) Click here

    OK

  16. CHECK FUSE (INV W/P)


    1. A01NN0SE03
      Text in Illustration
      *1 Engine Room Relay Block No. 2
      *2 INV W/P Fuse

      Remove the INV W/P fuse from the engine room relay block No. 2.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      INV W/P fuse Always Below 1Ω

    3. Install the INV W/P fuse.


    NG

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

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (INV W/P FUSE HOLDER TERMINAL)

  17. CHECK FUSE HOLDER TERMINAL (INV W/P FUSE)


    1. Check the terminals of the INV W/P fuse holder.

      OK
      The terminals of the INV W/P fuse holder are not bent, loose or corroded.

    NG

    CHECK FUSE (INV W/P) Click here

    OK

  18. CHECK FUSE (INV W/P)


    1. A01NN0SE03
      Text in Illustration
      *1 Engine Room Relay Block No. 2
      *2 INV W/P Fuse

      Remove the INV W/P fuse from the engine room relay block No. 2.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      INV W/P fuse Always Below 1Ω

    3. Install the INV W/P fuse.


    NG

    REPLACE FUSE (INV W/P) Click here

    OK

    CONNECT SECURELY (INV W/P FUSE)

  19. CHECK FUSE (INV W/P)


    1. A01NN0SE03
      Text in Illustration
      *1 Engine Room Relay Block No. 2
      *2 INV W/P Fuse

      Remove the INV W/P fuse from the engine room relay block No. 2.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      INV W/P fuse Always Below 1Ω

    3. Install the INV W/P fuse.


    NG

    REPLACE FUSE (INV W/P) Click here

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (INV W/P FUSE HOLDER TERMINAL)

  20. REPLACE FUSE (INV W/P)


    NEXT

    CONNECT SECURELY (INV W/P FUSE)

  21. REPLACE FUSE (INV W/P)


    NEXT

    REPAIR OR REPLACE HARNESS OR CONNECTOR (INV W/P FUSE HOLDER TERMINAL)

  22. CHECK FUSE (INV W/P)


    1. A01NN0SE03
      Text in Illustration
      *1 Engine Room Relay Block No. 2
      *2 INV W/P Fuse

      Remove the INV W/P fuse from the engine room relay block No. 2.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      INV W/P fuse Always Below 1Ω

    3. Install the INV W/P fuse.


    NG

    REPLACE FUSE (INV W/P) Click here

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    1. Disconnect the A73 inverter water pump assembly connector.

    2. A01NK4SE11
      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
      A73-1 (GND) - Body ground Power switch off Below 1 Ω

    3. Reconnect the A73 inverter water pump assembly connector.


    NG

    REPLACE FUSE (INV W/P) Click here

    OK

  24. CHECK FUSE HOLDER TERMINAL (INV W/P FUSE)


    1. Check the terminals of the INV W/P fuse holder.

      OK
      The terminals of the INV W/P fuse holder are not bent, loose or corroded.

    NG

    REPLACE FUSE (INV W/P) Click here

    OK

  25. REPLACE FUSE (INV W/P)


    NEXT

    REPLACE INVERTER WATER PUMP ASSEMBLY Click here

  26. REPLACE FUSE (INV W/P)


    NEXT

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  27. REPLACE FUSE (INV W/P)


    NEXT

    REPAIR OR REPLACE HARNESS OR CONNECTOR (INV W/P FUSE HOLDER TERMINAL)