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 inverter water pump assembly speed signal line or inverter water pump assembly 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.

INSPECTION PROCEDURE

PROCEDURE


  1. 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 FUSE (IGCT NO. 3) Click here

    OK

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


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

      A003Y7QE01
      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

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


    1. A003YFM

      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

  4. 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.

      A003YFGE14
      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
      e1-3 (SWP) - A19-13 (IWP) 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
      e1-3 (SWP) or A19-13 (IWP) - 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

  5. CHECK POWER MANAGEMENT CONTROL ECU


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

    2. Turn the power switch on (IG).

    3. A003VQJE03
      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

  6. 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. A003ZIAE03
      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.


    NG

    REPLACE INVERTER WATER PUMP ASSEMBLY Click here

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  7. CHECK FUSE (IGCT NO. 3)


    1. A003WZGE01
      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

    Click here

    OK

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


    1. A003YFM

      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

  9. 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 A19 from the power management control ECU.

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

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

      A003ZMUE01
      Text in Illustration
      *1 Engine Room Junction Block Assembly *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) - e1- 4 (+BWP) Power switch off Below 1Ω
      1 (IGCT NO. 3 fuse) - 5 (IGCT relay) Power switch off Below 1Ω
      e1-1 (GND) - Body ground Power switch off Below 1Ω
      e1-2 (NWP) - A19-14 (NIWP) Power switch off Below 1Ω
      e1-3 (SWP) - A19-13 (IWP) 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
      1 (IGCT NO. 3 fuse) or 5 (IGCT relay) - Body ground and other terminals Power switch off 10 kΩ or higher
      e1-2 (NWP) or A19-14 (NIWP) - Body ground and other terminals Power switch off 10 kΩ or higher
      e1-3 (SWP) or A19-13 (IWP) - 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.

    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.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE INVERTER WATER PUMP ASSEMBLY Click here

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


    1. A003YFM

      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

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


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

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

    3. A003X2ME01
      Text in Illustration
      *1 Engine Room Junction Block Assembly
      *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 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.

    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


    1. Replace the 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


    1. Repair or replace the wire harness or connector.


    NEXT

    REPLACE FUSE (IGCT NO. 3)