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Home >> Toyota >> 2017 >> Prius Three Touring >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control System (Nickel Metal Hydride) - Diagnostic Codes (6 Of 8) >> HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY) >> DTC P314A-31: Motor Electronics Coolant Pump "A" No Signal [11/2015 -] >> Procedure

DTC P314A-31: Motor Electronics Coolant Pump "A" No Signal [11/2015 -]: Procedure

  1. CLEAR DTC 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
    4. Clear the DTCs.

      Powertrain > Hybrid Control > Clear DTCs 

    5. Turn the power switch off and wait for 2 minutes or more.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  2

  2. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE INVERTER WATER PUMP) 
    NOTE:
    • Make sure that the HV coolant level is above the low line of the inverter reserve tank.
    • Be sure to perform the inspection with the auxiliary battery voltage at 12 V or more.

    HINT: 

    • When the auxiliary battery voltage is low, the inverter water pump assembly may not operate.
    • When the inverter water pump assembly signal line (SWP - IWP) is open or its connection is faulty, the inverter water pump assembly is operated forcibly.
    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.
    4. Perform the "Activate the Inverter Water Pump" Active Test.

      Powertrain > Hybrid Control > Active Test 

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

      OK

      The inverter water pump is operating (vibrating).

      HINT: 

      Perform the Active Test with the inverter coolant temperature between -15 and 65°C (5 to 149°F).

    6. Turn the power switch off.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  9

    Result: 

    OK 

    See step  3

  3. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) 
    1. Check the connector connections and contact pressure of the relevant terminals for the hybrid vehicle control ECU connectors.

      HINT: 

      Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [11/2015 -]

      GTY542745Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK

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

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CONNECT SECURELY 

    Result: 

    OK 

    See step  4

  4. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WATER PUMP ASSEMBLY CONNECTOR) 
    1. Check the connector connections and contact pressure of the relevant terminals for the inverter water pump assembly connector.

      HINT: 

      Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [11/2015 -]

      GTY542781Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK

      The connector is connected securely, the terminals are not deformed or corroded and there are no contact problems.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CONNECT SECURELY 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WATER PUMP ASSEMBLY) 
    1. Disconnect the A50 hybrid vehicle control ECU connector.
    2. Disconnect the A7 inverter water pump assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY602606Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Hybrid Vehicle Control ECU)
      *b Front view of wire harness connector
      (to Inverter Water Pump Assembly)

      Standard Resistance (Check for Open)

      (A50, A7)

      (A50)

      (A7)

      Tester Connection Condition Specified Condition
      A50-33 (NIWP) - A7-2 (NWP) Power switch off Below 1 Ω

      Standard Resistance (Check for Short)

      (A50, A7)

      (A50)

      (A7)

      Tester Connection Condition Specified Condition
      A50-33 (NIWP) or A7-2 (NWP) -Body ground and other terminals Power switch off 10 kΩ or higher

      HINT: 

      Check the condition (looseness, deterioration, etc.) of the wire to body ground for the inverter water pump assembly.

    4. Reconnect the A7 inverter water pump assembly connector.
    5. Reconnect the A50 hybrid vehicle control ECU connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK HYBRID VEHICLE CONTROL ECU 
    1. Disconnect the A7 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.
      GTY540219Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Hybrid Vehicle Control ECU)      		 - -

      Standard Voltage

      (A50, F3)

      (A50)

      (F3)

      Tester Connection Condition Specified Condition
      A50-33 (NIWP) - F3-3 (E1) Power switch on (IG) 11 to 14 V
    4. Turn the power switch off.
    5. Reconnect the A7 inverter water pump assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [11/2015 - 12/2018]  , or refer to  REMOVAL [12/2018 - 08/2019]  , or refer to  REMOVAL [08/2019 - 07/2020]  , or refer to  REMOVAL [07/2020 -] 

    Result: 

    OK 

    See step  7

  7. CLEAR DTC 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
    4. Clear the DTCs.

      Powertrain > Hybrid Control > Clear DTCs 

    5. Turn the power switch off and wait for 2 minutes or more.

      Result

      Proceed to
      NEXT

    Result: 

    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 12 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 

      Active Test Display
      Activate the Inverter Water Pump
      Data List Display
      Inverter Water Pump
    4. Perform the "Activate the Inverter Water Pump" Active Test.
    5. Connect an oscilloscope between the hybrid vehicle control ECU terminals specified in the table below, and measure the waveform.
      GTY601810Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Hybrid Vehicle Control ECU)      		 - -
      Item Content
      Terminal A50-33 (NIWP) - F3-3 (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: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [11/2015 - 12/2018]  , or refer to  REMOVAL [12/2018 - 08/2019]  , or refer to  REMOVAL [08/2019 - 07/2020]  , or refer to  REMOVAL [07/2020 -] 

    Result: 

    NG 

    See step  12

  9. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WATER PUMP ASSEMBLY CONNECTOR) 
    1. Check the connector connections and contact pressure of the relevant terminals for the inverter water pump assembly connector.

      HINT: 

      Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [11/2015 -]

      GTY542781Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK

      The connector is connected securely, the terminals are not deformed or corroded and there are no contact problems.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  14

    Result: 

    OK 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP ASSEMBLY - IGCT RELAY) 
    1. Remove the IGCT relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    2. Disconnect the A7 inverter water pump assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY599753Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly *2 IGCT Relay
      *a Front view of wire harness connector
      (to Inverter Water Pump Assembly)      		 - -

      Standard Resistance

      (A7)

      (A7)

      Tester Connection Condition Specified Condition
      A7-4 (+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. 1 Engine Room Relay Block and No. 1 Junction Block Assembly

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

      • IGCT relay

        Apply slight vibration with a finger to the IGCT relay and check whether a malfunction occurs.

      GTY443038Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Example
      *b Shake Slightly
      *c Vibrate Slightly
    4. Reconnect the A7 inverter water pump assembly connector.
    5. Install the IGCT relay.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  15

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP ASSEMBLY - BODY GROUND) 
    1. Disconnect the A7 inverter water pump assembly connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY550469Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Inverter Water Pump Assembly)

      Standard Resistance

      (A7)

      (A7)

      Tester Connection Condition Specified Condition
      A7-1 (GND) - Body ground Power switch off Below 1 Ω
    3. Reconnect the A7 inverter water pump assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  12

  12. REPLACE INVERTER WATER PUMP ASSEMBLY 

    HINT: 

    Refer to REMOVAL [11/2015 -]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  13

  13. ADD HV COOLANT AND PERFORM AIR BLEEDING 
    1. After replacing the inverter water pump assembly, add HV coolant and perform air bleeding.

      HINT: 

      Refer to REPLACEMENT [11/2015 -]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    END 

  14. CHECK FUSE (INV W/PMP) 
    1. Remove the INV W/PMP fuse from the No. 1 engine room relay block and No. 1 junction block assembly.
      GTY540924Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *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: 

    OK 

    CONNECT SECURELY (INVERTER WATER PUMP ASSEMBLY CONNECTOR) 

    Result: 

    NG 

    See step  18

  15. 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.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  19

    Result: 

    OK 

    See step  16

  16. CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP ASSEMBLY CIRCUIT) 
    1. Remove the INV W/PMP fuse from the No. 1 engine room relay block and No. 1 junction block assembly.
    2. Remove the IGCT relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    3. Disconnect the A7 inverter water pump assembly connector.
    4. Measure the resistance according to the value(s) in the table below.
      GTY562730Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly *2 INV W/PMP Fuse
      *3 IGCT Relay - -
      *a Front view of wire harness connector
      (to Inverter Water Pump Assembly)      		 - -

      Standard Resistance

      (A7)

      (A7)

      Tester Connection Condition Specified Condition
      2 (INV W/PMP fuse) - A7-4 (+BWP) Power switch off Below 1 Ω
      1 (INV W/PMP fuse) - 5 (IGCT relay) Power switch off Below 1 Ω
      2 (INV W/PMP fuse) or A7-4 (+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.

    5. Reconnect the A7 inverter water pump assembly connector.
    6. Install the IGCT relay.
    7. Install the INV W/PMP fuse.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  21

    Result: 

    OK 

    See step  17

  17. CHECK FUSE (INV W/PMP) 
    1. Remove the INV W/PMP fuse from the No. 1 engine room relay block and No. 1 junction block assembly.
      GTY540924Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *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: 

    OK 

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

    Result: 

    NG 

    See step  22

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

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    REPLACE FUSE (INV W/PMP) 

  19. CHECK FUSE HOLDER TERMINAL (INV W/PMP FUSE) 
    1. Check the terminals of the INV W/PMP fuse holder.

      OK

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

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  26

    Result: 

    OK 

    See step  20

  20. CHECK FUSE (INV W/PMP) 
    1. Remove the INV W/PMP fuse from the No. 1 engine room relay block and No. 1 junction block assembly.
      GTY540924Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *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: 

    OK 

    CONNECT SECURELY (INV W/PMP FUSE) 

    Result: 

    NG 

    REPLACE FUSE (INV W/PMP) 

  21. CHECK FUSE (INV W/PMP) 
    1. Remove the INV W/PMP fuse from the No. 1 engine room relay block and No. 1 junction block assembly.
      GTY540924Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *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: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    NG 

    See step  27

  22. CHECK HARNESS AND CONNECTOR (INVERTER WATER PUMP ASSEMBLY - BODY GROUND) 
    1. Disconnect the A7 inverter water pump assembly connector.
    2. Measure the resistance according to the value(s) in the table below.
      GTY550469Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Inverter Water Pump Assembly)

      Standard Resistance

      (A7)

      (A7)

      Tester Connection Condition Specified Condition
      A7-1 (GND) - Body ground Power switch off Below 1 Ω
    3. Reconnect the A7 inverter water pump assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  27

    Result: 

    OK 

    See step  23

  23. CHECK FUSE HOLDER TERMINAL (INV W/PMP FUSE) 
    1. Check the terminals of the INV W/PMP fuse holder.

      OK

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

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  28

    Result: 

    OK 

    See step  24

  24. REPLACE INVERTER WATER PUMP ASSEMBLY 

    HINT: 

    Refer to REMOVAL [11/2015 -]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  25

  25. ADD HV COOLANT AND PERFORM AIR BLEEDING 
    1. After replacing the inverter water pump assembly, add HV coolant and perform air bleeding.

      HINT: 

      Refer to REPLACEMENT [11/2015 -]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    REPLACE FUSE (INV W/PMP) 

  26. CHECK FUSE (INV W/PMP) 
    1. Remove the INV W/PMP fuse from the No. 1 engine room relay block and No. 1 junction block assembly.
      GTY540924Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *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: 

    OK 

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

    Result: 

    NG 

    See step  28

  27. REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    REPLACE FUSE (INV W/PMP) 

  28. 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: 

    NEXT 

    REPLACE FUSE (INV W/PMP) 

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