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 power management control ECU. When the power switch is on (READY), if the water pump speed (measured value) remains too low, 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.

  • Wire harness or connector

  • Power management 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

  • 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.

INSPECTION PROCEDURE

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 water pump is operating (vibrating).

    6. Turn the power switch off.


    NG

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (ACTIVATE THE WATER PUMP) Click here

    OK

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


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

      A01JA9CE01
      Text in Illustration
      *1 for LHD *2 for RHD
      OK
      The connectors are connected securely and there are no contact problems.

    NG

    CONNECT SECURELY Click here

    OK

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


    1. A01JC8D

      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 Click here

    OK

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


    1. Disconnect connector A21 from the power management control ECU.

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

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

      A01JCKXE24
      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
      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. 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 g1 from the inverter water pump assembly.

    2. Turn the power switch on (IG).

    3. A01JAKSE36
      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
      A21-14 (NIWP) - L5-6 (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 / 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. A01J9BOE04
      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 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.


    NG

    REPLACE INVERTER WATER PUMP ASSEMBLY Click here

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

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


    1. A01JC8D

      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 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.

      A01JBA1E01
      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.

      A01JAPDE02
      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. Connect the inverter water pump assembly connector.

    5. Install the IGCT relay.


    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. A01JADQE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Water Pump with Motor 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 on (IG) Below 1 Ω

    3. Connect the inverter water pump assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE INVERTER WATER PUMP ASSEMBLY Click here

  12. CHECK FUSE (IGCT NO. 3)


    1. A01JAJWE01
      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.


    NG

    CONNECT SECURELY Click here

    OK

    CONNECT SECURELY (INVERTER WATER PUMP ASSEMBLY CONNECTOR)

  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 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.

      A01JA4PE01
      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 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. Connect the inverter water pump assembly connector.

    6. Install the IGCT relay.

    7. Install the IGCT No. 3 fuse.


    NG

    CHECK FUSE (IGCT NO. 3) Click here

    OK

  15. CHECK FUSE (IGCT NO. 3)


    1. A01JAJWE01
      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.


    NG

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

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  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. A01JAJWE01
      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.


    NG

    REPLACE FUSE (IGCT NO. 3)

    OK

    CONNECT SECURELY (IGCT NO. 3 FUSE)

  18. CHECK FUSE (IGCT NO. 3)


    1. A01JAJWE01
      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.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


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

    2. A01JADQE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Water Pump with Motor 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 on (IG) 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 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. A01JAJWE01
      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.


    NG

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

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  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)