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Home >> Toyota >> 2016 >> Highlander Hybrid Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 75 (Hybrid Control System (2GR-FXS) - Diagnostic Codes (3 Of 6)) >> Hybrid Control System >> DTC P314A-828: Inverter Coolant Pump Speed Signal [11/2016 - ] >> Procedure

DTC P314A-828: Inverter Coolant Pump Speed Signal [11/2016 - ]: Procedure

WARNING: This page is about a different car, the 2019 Toyota Highlander, 2018 Toyota Highlander, and 2017 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
  1. CLEAR DTC 

    Refer to PROCEDURE - Step 3

    Result

    Proceed to
    NEXT

    Result:  1

    NEXT 

    See step  2

  2. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE (INVERTER) WATER PUMP) 
    NOTE:

    Be sure to perform the inspection with the auxiliary battery voltage at 11 V or more.

    HINT: 

    When the auxiliary battery voltage is low, the inverter water pump assembly may not operate.

    1. Connect the Techstream 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.

      Powertrain > Hybrid Control > Active Test 

      Tester Display
      Activate the (Inverter) Water Pump
    4. Perform the "Activate the (Inverter) Water Pump" Active Test.
    5. Touch the inverter water pump assembly and check that it is operating (vibrating).

      OK

      The inverter water pump is operating (vibrating).

    6. Turn the power switch off.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  9

    Result:  1

    OK 

    See step  3

  3. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU ASSEMBLY CONNECTOR) 

    Refer to PROCEDURE - Step 1

    Result

    Proceed to
    OK
    NG

    Result:  2

    NG 

    CONNECT SECURELY 

    Result:  1

    OK 

    See step  4

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

    Refer to PROCEDURE - Step 8

    Result

    Proceed to
    OK
    NG

    Result:  2

    NG 

    CONNECT SECURELY 

    Result:  1

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - INVERTER WATER PUMP ASSEMBLY) 
    1. Disconnect the A85 hybrid vehicle control ECU assembly connector.
    2. Disconnect the A9 inverter water pump assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY715481Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to Hybrid Vehicle Control ECU Assembly)      		 *b Front view of wire harness connector
      (to Inverter Water Pump Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      A85-14 (NIWP) - A9-2 (NWP) Power switch off Below 1 Ω
      A85-14 (NIWP) or A9-2 (NWP) -Body ground and other terminals Power switch off 10 kΩ or higher
    4. Reconnect the A9 inverter water pump assembly connector.
    5. Reconnect the A85 hybrid vehicle control ECU assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  1

    OK 

    See step  6

  6. CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY 
    1. Disconnect the A9 inverter water pump assembly connector.
    2. Turn the power switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.
      GTY721587Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Hybrid Vehicle Control ECU Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition
      A85-14 (NIWP) - F136-6 (E1) Power switch on (IG) 11 to 14 V
    4. Turn the power switch off.
    5. Reconnect the A9 inverter water pump assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  COMPONENTS [11/2016 - ] 

    Result:  1

    OK 

    See step  7

  7. CLEAR DTC 

    Refer to PROCEDURE - Step 3

    Result

    Proceed to
    NEXT

    Result:  1

    NEXT 

    See step  8

  8. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE (INVERTER) WATER PUMP) 
    NOTE:

    Be sure to perform the inspection with the auxiliary battery voltage at 11 V or more.

    HINT: 

    When the auxiliary battery voltage is low, the inverter water pump assembly may not operate.

    1. Connect the Techstream 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.

      Powertrain > Hybrid Control > Active Test 

      Tester Display
      Activate the (Inverter) Water Pump
    4. Perform the "Activate the (Inverter) Water Pump" Active Test.
    5. Connect an oscilloscope between the hybrid vehicle control ECU assembly terminals specified in the table below, and measure the waveform.
      GTY710495Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Hybrid Vehicle Control ECU Assembly)
      Item Content
      Terminal A85-14 (NIWP) - F136-6 (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.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  COMPONENTS [11/2016 - ] 

    Result:  2

    NG 

    REPLACE INVERTER WATER PUMP ASSEMBLY. Refer to  COMPONENTS [11/2016 - ] 

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

    Refer to PROCEDURE - Step 8

    Result

    Proceed to
    OK
    NG

    Result:  2

    NG 

    See step  22

    Result:  1

    OK 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP ASSEMBLY - IGCT RELAY) 
    1. Remove the IGCT relay from the No. 3 engine room relay block.
      GTY453872Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Engine Room Relay Block
      *2 IGCT Relay
    2. Disconnect the A9 inverter water pump assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY442378Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Engine Room Relay Block *2 IGCT Relay
      *a Front view of wire harness connector
      (to Inverter Water Pump Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      A9-4 (+BWP) - 5 (IGCT relay) Power switch off Below 1 Ω
      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.

      HINT: 

      • 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. 3 engine room relay block

        Apply slight vibration with a finger to the No. 3 engine room relay block and check whether a malfunction occurs.

      • INV W/PMP fuse

        Apply slight vibration with a finger to the INV W/PMP fuse and check whether a malfunction occurs.

      GTY443038Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Example
      *b Shake Slightly
      *c Vibrate Slightly
    4. Install the IGCT relay.
    5. Reconnect the A9 inverter water pump assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  12

    Result:  1

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP ASSEMBLY - BODY GROUND) 
    1. Disconnect the A9 inverter water pump assembly connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY429617Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Inverter Water Pump Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      A9-1 (GND) - Body ground Power switch off Below 1 Ω
    3. Reconnect the A9 inverter water pump assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE INVERTER WATER PUMP ASSEMBLY. Refer to  COMPONENTS [11/2016 - ] 

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  12. CHECK INSTALLATION CONDITION (INV W/PMP FUSE) 
    1. Check installation condition of the INV W/PMP fuse.

      OK

      INV W/PMP fuse is installed correctly.

      GTY432906Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Engine Room Relay Block
      *2 INV W/PMP Fuse

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  20

    Result:  1

    OK 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP ASSEMBLY CIRCUIT) 
    1. Remove the IGCT relay and INV W/PMP fuse from the No. 3 engine room relay block.
      GTY428996Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Engine Room Relay Block
      *2 IGCT Relay
      *3 INV W/PMP Fuse
    2. Disconnect the A9 inverter water pump assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY431426Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Engine Room Relay Block *2 IGCT Relay
      *3 INV W/PMP Fuse - -
      *a Front view of wire harness connector
      (to Inverter Water Pump Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      A9-4 (+BWP) - 2 (INV W/PMP fuse) Power switch off Below 1 Ω
      1 (INV W/PMP fuse) - 5 (IGCT relay) Power switch off Below 1 Ω
      A9-4 (+BWP) or 2 (INV W/PMP fuse) - 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 relay and INV W/PMP fuse.
    5. Reconnect the A9 inverter water pump assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  18

    Result:  1

    OK 

    See step  14

  14. CHECK FUSE (INV W/PMP) 
    1. Remove the INV W/PMP fuse from the No. 3 engine room relay block.
      GTY432906Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Engine Room Relay Block
      *2 INV W/PMP Fuse
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      INV W/PMP fuse Always Below 1 Ω
    3. Install the INV W/PMP fuse.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  2

    NG 

    See step  15

  15. CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP ASSEMBLY - BODY GROUND) 
    1. Disconnect the A9 inverter water pump assembly connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY451662Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Inverter Water Pump Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      A9-1 (GND) - Body ground Power switch off Below 1 Ω
    3. Reconnect the A9 inverter water pump assembly connector.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  19

    Result:  1

    OK 

    See step  16

  16. CHECK FUSE HOLDER TERMINAL (INV W/PMP FUSE) 
    1. Check the terminals of the INV W/PMP fuse holder.
      GTY432906Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Engine Room Relay Block
      *2 INV W/PMP Fuse

      OK

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

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  25

    Result:  1

    OK 

    See step  17

  17. REPLACE INVERTER WATER PUMP ASSEMBLY 

    Refer to COMPONENTS [11/2016 - ]

    Result

    Proceed to
    NEXT

    Result:  1

    NEXT 

    REPLACE FUSE (INV W/PMP) 

  18. CHECK FUSE (INV W/PMP) 
    1. Remove the INV W/PMP fuse from the No. 3 engine room relay block.
      GTY432906Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Engine Room Relay Block
      *2 INV W/PMP Fuse
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      INV W/PMP fuse Always Below 1 Ω
    3. Install the INV W/PMP fuse.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  2

    NG 

    See step  19

  19. REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result

    Proceed to
    NEXT

    Result:  1

    NEXT 

    REPLACE FUSE (INV W/PMP) 

  20. CHECK FUSE HOLDER TERMINAL (INV W/PMP FUSE) 
    1. Check the terminals of the INV W/PMP fuse holder.
      GTY432906Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Engine Room Relay Block
      *2 INV W/PMP Fuse

      OK

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

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  23

    Result:  1

    OK 

    See step  21

  21. CHECK FUSE (INV W/PMP) 
    1. Remove the INV W/PMP fuse from the No. 3 engine room relay block.
      GTY432906Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Engine Room Relay Block
      *2 INV W/PMP Fuse
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      INV W/PMP fuse Always Below 1 Ω
    3. Install the INV W/PMP fuse.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    CONNECT SECURELY (INV W/PMP FUSE) 

    Result:  2

    NG 

    REPLACE FUSE (INV W/PMP) 

  22. CHECK FUSE (INV W/PMP) 
    1. Remove the INV W/PMP fuse from the No. 3 engine room relay block.
      GTY432906Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Engine Room Relay Block
      *2 INV W/PMP Fuse
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      INV W/PMP fuse Always Below 1 Ω
    3. Install the INV W/PMP fuse.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    CONNECT SECURELY (INVERTER WATER PUMP ASSEMBLY CONNECTOR) 

    Result:  2

    NG 

    See step  24

  23. CHECK FUSE (INV W/PMP) 
    1. Remove the INV W/PMP fuse from the No. 3 engine room relay block.
      GTY432906Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 3 Engine Room Relay Block
      *2 INV W/PMP Fuse
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      INV W/PMP fuse Always Below 1 Ω
    3. Install the INV W/PMP fuse.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

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

    Result:  2

    NG 

    See step  25

  24. CONNECT SECURELY 
    1. Connect the inverter water pump assembly connector securely.

      Result

      Proceed to
      NEXT

    Result:  1

    NEXT 

    REPLACE FUSE (INV W/PMP) 

  25. REPAIR OR REPLACE HARNESS OR CONNECTOR (INV W/PMP FUSE HOLDER TERMINAL) 
    1. Repair or Replace the terminals of the INV W/PMP fuse holder.

      Result

      Proceed to
      NEXT

    Result:  1

    NEXT 

    REPLACE FUSE (INV W/PMP) 

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