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. DTC Detection Condition Trouble Area
P314A-828 The water pump speed signal is not sent to the power management control ECU when the power switch is turned on (READY).*

  • Wire harness or connector

  • Power management control ECU

  • Inverter water pump with motor assembly

  • INV W/P fuse

  • IGCT No. 2 fuse

  • INV W/P relay

WIRING DIAGRAM

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

INSPECTION PROCEDURE

Note

If DTC P0A78-284, 286, 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 GTS to the DLC3.

    2. Turn the power switch on (IG).

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

    4. Read and record the DTCs and freeze frame data.

    5. Clear DTCs and freeze frame data.

    6. Turn the power switch off.


    NEXT

  2. PERFORM ACTIVE TEST USING GTS (ACTIVATE THE (INVERTER) 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 with motor 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 (Inverter) Water Pump.

    4. Perform the "Activate the (Inverter) Water Pump" Active Test.

    5. Touch the inverter water pump with motor assembly and check that it is operating (vibrating).

      OK
      The inverter water pump with motor is operating (vibrating).

    6. Turn the power switch off.


    NG

    Click here

    OK

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


    1. A01FQC6E01
      Text in Illustration
      *A for LHD
      *B for RHD

      Check the connector connections and contact pressure of the relevant terminals for the power management control ECU connectors Click here.

      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 WITH MOTOR ASSEMBLY CONNECTOR)


    1. A01FTJG

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

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

    NG

    CONNECT SECURELY

    OK

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


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

    2. Disconnect the connector from the inverter water pump with motor assembly.

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

      A01FTQYE23
      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 with Motor Assembly)
      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A35-12 (NIWP) - A26-2 (NWP) Power switch off Below 1 Ω
      A35-12 (NIWP) or A26-2 (NWP) - 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 with motor assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK POWER MANAGEMENT CONTROL ECU


    1. Disconnect the connector from the inverter water pump with motor assembly.

    2. Turn the power switch on (IG).

    3. A01FV0LE21
      Text in Illustration
      *a

      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
      A35-12 (NIWP) - N91-6 (E1) Power switch on (IG) 11 to 14 V

    4. Turn the power switch off.

    5. Connect the inverter water pump with motor assembly connector.


    NG

    REPLACE POWER MANAGEMENT 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. Read and record the DTCs and freeze frame data.

    5. Clear DTCs and freeze frame data.

    6. Turn the power switch off.


    NEXT

  8. PERFORM ACTIVE TEST USING GTS (ACTIVATE THE (INVERTER) 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 with motor 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 (Inverter) Water Pump.

    4. Perform the "Activate the (Inverter) Water Pump" Active Test.

    5. A01FQQSE01

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

      Item Content
      Tester Connection A35-12 (NIWP) - N91-6 (E1)
      Equipment Setting 5 V/DIV., 100 ms./DIV.
      Condition Power switch on (IG), during Active Test
      OK
      Period of waveform is 300 milliseconds or less
      Text in Illustration
      *a

      Component with harness connected

      (Power Management Control ECU)

    6. Turn the power switch off.


    NG

    REPLACE INVERTER WATER PUMP WITH MOTOR ASSEMBLY Click here

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

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


    1. A01FTJG

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

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

    NG

    CONNECT SECURELY

    OK

  10. CHECK INSTALLATION CONDITION (INV W/P RELAY)


    1. A01FTTCE01
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 INV W/P Relay

      Check installation condition of the INV W/P relay.

      OK
      INV W/P relay is installed correctly.

    NG

    INSPECT RELAY (INV W/P) Click here

    OK

  11. CHECK HARNESS AND CONNECTOR (IGCT RELAY - INV W/P RELAY)


    1. Remove the IGCT relay and INV W/P relay from the No. 1 engine room relay block and junction block assembly.

    2. A01FQRLE01

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      5 (IGCT relay) - 1 (INV W/P relay) Power switch off Below 1 Ω
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 INV W/P Relay
      *3 IGCT Relay

      Note

      Do not apply excessive force when using the probes of the tester to perform the inspection. If excessive force is used, the holders will be damaged.

      Tech Tips


      • A01FR5NE01

        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.

      • No. 1 Engine Room Relay Block and Junction Block Assembly

        Apply slight vibration with a finger to the No. 1 engine room relay block and junction block assembly and check whether a malfunction occurs.

      • IGCT No. 2 Fuse

        Apply slight vibration with a finger to the IGCT No. 2 fuse and check whether a malfunction occurs.

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

    3. Install the IGCT relay and INV W/P relay.


    NG

    CHECK INSTALLATION CONDITION (IGCT NO. 2 FUSE) Click here

    OK

  12. INSPECT RELAY (INV W/P)


    1. A01FTTCE01
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 INV W/P Relay

      Remove the INV W/P relay from the No. 1 engine room relay block and junction block assembly.

    2. A01FQ82E03
      Text in Illustration
      *1 INV W/P Relay

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Auxiliary battery voltage is not applied between terminals 1 and 2 10 kΩ or higher
      Auxiliary battery voltage is applied between terminals 1 and 2 Below 1 Ω

    3. Install the INV W/P relay.


    NG

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

    OK

  13. CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP WITH MOTOR ASSEMBLY - BODY GROUND)


    1. Disconnect the connector from the inverter water pump with motor assembly.

    2. A01FQV8E14
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Inverter Water Pump with Motor Assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A26-4 (+BWP) - Body ground Power switch on (IG) 11 to 14 V

      Note


      • Turning the power switch on (IG) with the inverter water pump with motor assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

      • Do not apply excessive force when using the probes of the tester to perform the inspection. If excessive force is used, the holders will be damaged.

    3. Connect the inverter water pump with motor assembly connector.


    NG

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

    OK

  14. CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP WITH MOTOR ASSEMBLY - BODY GROUND)


    1. Disconnect the connector from the inverter water pump with motor assembly.

    2. A01FQV8E15
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Inverter 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
      A26-1 (GND) - Body ground Power switch off Below 1 Ω

    3. Connect the inverter water pump with motor assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE INVERTER WATER PUMP WITH MOTOR ASSEMBLY Click here

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


    1. A01FVKME01
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 INV W/P Fuse

      Check installation condition of the INV W/P fuse.

      OK
      INV W/P fuse is installed correctly.

    NG

    CONNECT SECURELY

    OK

  16. INSPECT RELAY (INV W/P)


    1. A01FTTCE01
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 INV W/P Relay

      Remove the INV W/P relay from the No. 1 engine room relay block and junction block assembly.

    2. A01FQ82E03
      Text in Illustration
      *1 INV W/P Relay

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Auxiliary battery voltage is not applied between terminals 1 and 2 10 kΩ or higher
      Auxiliary battery voltage is not applied between terminals 1 and 2 Below 1 Ω

    3. Install the INV W/P relay.


    NG

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

    OK

  17. CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP WITH MOTOR ASSEMBLY - NO. 1 ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK ASSEMBLY)


    1. Remove the INV W/P relay from the No. 1 engine room relay block and junction block assembly.

    2. Disconnect the connector from the inverter water pump with motor assembly.

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

      A01FVHYE01
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly *2 INV W/P Relay
      *a

      Front view of wire harness connector

      (to Inverter Water Pump with Motor Assembly)

      		 - -
      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A26-4 (+BWP) - 3 (INV W/P relay) Power switch off Below 1 Ω
      A26-4 (+BWP) or 3 (INV W/P relay) - 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 holders will be damaged.

    4. Install the INV W/P relay.

    5. Connect the inverter water pump with motor assembly connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  18. CHECK FUSE (INV W/P)


    1. A01FVKME01
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 INV W/P Fuse

      Remove the INV W/P fuse from the No. 1 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
      INV W/P fuse Always Below 1 Ω

    3. Install the INV W/P fuse.


    NG

    REPLACE INVERTER WATER PUMP WITH MOTOR ASSEMBLY Click here

    OK

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

  19. REPLACE INVERTER WATER PUMP WITH MOTOR ASSEMBLY

    Click here


    NEXT

    REPLACE FUSE (INV W/P)

  20. CHECK RELAY HOLDER TERMINAL (INV W/P RELAY)


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

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

    NG

    CHECK FUSE (IGCT NO. 2) Click here

    OK

  21. CHECK FUSE (IGCT NO. 2)


    1. A01FQGOE01
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT No. 2 Fuse

      Remove the IGCT No. 2 fuse from the No. 1 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. 2 fuse Always Below 1 Ω

    3. Install the IGCT No. 2 fuse.


    NG

    REPLACE RELAY (INV W/P) Click here

    OK

    REPLACE RELAY (INV W/P)

  22. REPLACE RELAY (INV W/P)


    NEXT

    REPLACE FUSE (IGCT NO. 2)

  23. CHECK RELAY HOLDER TERMINAL (INV W/P RELAY)


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

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (INV W/P RELAY HOLDER TERMINAL) Click here

    OK

    REPLACE RELAY (INV W/P)

  24. CHECK FUSE (IGCT NO. 2)


    1. A01FQGOE01
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT No. 2 Fuse

      Remove the IGCT No. 2 fuse from the No. 1 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. 2 fuse Always Below 1 Ω

    3. Install the IGCT No. 2 fuse.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (INV W/P RELAY HOLDER TERMINAL) Click here

    OK

  25. REPAIR OR REPLACE HARNESS OR CONNECTOR (INV W/P RELAY HOLDER TERMINAL)


    NEXT

    REPLACE RELAY (INV W/P)

  26. REPAIR OR REPLACE HARNESS OR CONNECTOR (INV W/P RELAY HOLDER TERMINAL)


    NEXT

    REPLACE RELAY (INV W/P)

  27. REPAIR OR REPLACE HARNESS OR CONNECTOR (INV W/P RELAY HOLDER TERMINAL)


    NEXT

  28. REPLACE FUSE (IGCT NO. 2)


    NEXT

    REPLACE RELAY (INV W/P)

  29. CHECK INSTALLATION CONDITION (IGCT NO. 2 FUSE)


    1. A01FQGOE01
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT No. 2 Fuse

      Check installation condition of the IGCT No. 2 fuse

      OK
      IGCT No. 2 fuse is installed correctly.

    NG

    INSPECT RELAY (INV W/P) Click here

    OK

  30. CHECK FUSE (IGCT NO. 2)


    1. A01FQGOE01
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 IGCT No. 2 Fuse

      Remove the IGCT No. 2 fuse from the No. 1 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. 2 fuse Always Below 1 Ω

    3. Install the IGCT No. 2 fuse.


    NG

    CHECK FUSE HOLDER TERMINAL (IGCT NO. 2 FUSE) Click here

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IGCT NO. 2 FUSE HOLDER TERMINAL)

  31. CHECK FUSE HOLDER TERMINAL (IGCT NO. 2 FUSE)


    1. Check the terminals of the IGCT No. 2 fuse holder.

      OK
      The terminals of the IGCT No. 2 fuse holder are not bent, loose or corroded.

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IGCT NO. 2 FUSE HOLDER TERMINAL) Click here

    OK

    REPLACE FUSE (IGCT NO. 2)

  32. REPAIR OR REPLACE HARNESS OR CONNECTOR (IGCT NO. 2 FUSE HOLDER TERMINAL)


    NEXT

    REPLACE FUSE (IGCT NO. 2)

  33. INSPECT RELAY (INV W/P)


    1. A01FTTCE01
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 INV W/P Relay

      Remove the INV W/P relay from the No. 1 engine room relay block and junction block assembly.

    2. A01FQ82E03
      Text in Illustration
      *1 INV W/P Relay

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Auxiliary battery voltage is not applied between terminals 1 and 2 10 kΩ or higher
      Auxiliary battery voltage is applied between terminals 1 and 2 Below 1 Ω

    3. Install the INV W/P relay.


    NG

    REPLACE RELAY (INV W/P) Click here

    OK

    CONNECT SECURELY (IGCT NO. 2 FUSE)

  34. INSPECT RELAY (INV W/P)


    1. A01FTTCE01
      Text in Illustration
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly
      *2 INV W/P Relay

      Remove the INV W/P relay from the No. 1 engine room relay block and junction block assembly.

    2. A01FQ82E03
      Text in Illustration
      *1 INV W/P Relay

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Auxiliary battery voltage is not applied between terminals 1 and 2 10 kΩ or higher
      Auxiliary battery voltage is applied between terminals 1 and 2 Below 1 Ω

    3. Install the INV W/P relay.


    NG

    REPLACE RELAY (INV W/P)

    OK

    CONNECT SECURELY (INV W/P RELAY)

  35. REPLACE RELAY (INV W/P)


    NEXT

    CONNECT SECURELY (IGCT NO. 2 FUSE)