DTC    P314A-828    Inverter Coolant Pump Speed Signal

for Preparation Click here


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.
  1. Wire harness or connector
  2. Power management control ECU
  3. Inverter water pump assembly
  4. IGCT No. 3 fuse

WIRING DIAGRAM

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

INSPECTION PROCEDURE

NOTICE:
If DTC P0A78-284, 286, P0A7A-322, 324, P0A94-553 or 557 is output, replace the inverter with converter assembly after this inspection.

1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (ACTIVATE THE WATER PUMP)

NOTICE:
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 intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Enter the following menus: Powertrain / Hybrid Control / Active Test / Activate the Water Pump.

  1. Perform the Activate the Water Pump Active Test.

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

    OK:
    The inverter water pump assembly is operating (vibrating).

  1. Turn the power switch off.



NG
Go to step 7
OK


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


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


    A237663E01


    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)


    A236717

  1. 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.

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



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


    A209031E14


    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

  1. Connect the power management control ECU connector.

  1. 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.

  1. Turn the power switch on (IG).



    A249750E03

  1. 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

    Text in Illustration 
    *a
    		Component with harness connected
    (to Power Management Control ECU)

  1. Turn the power switch off.

  1. 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)

NOTICE:
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 intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Enter the following menus: Powertrain / Hybrid Control / Active Test / Activate the Water Pump.

  1. Select Inverter W/P Revolution in the Data List.

  1. While performing the "Activate the Water Pump" Active Test, check Inverter W/P Revolution in the Data List.

    Result:
    Data List Item
    		Specified Condition
    Inverter W/P Revolution
    		125 rpm or higher

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

  1. Turn the power switch off.



NG
REPLACE POWER MANAGEMENT CONTROL ECU (Click here)
OK

REPLACE INVERTER WATER PUMP ASSEMBLY (Click here)  

7.CHECK FUSE (IGCT NO. 3)


    A249139E01

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

  1. 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

    Text in Illustration 
    *1
    		Engine Room Junction Block Assembly
    *2
    		IGCT NO. 3 Fuse

  1. Install the IGCT NO. 3 fuse.



NG
Go to step 10
OK


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


    A236717

  1. 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.

  1. Remove the IGCT relay from the engine room junction block assembly.

  1. Disconnect connector A19 from the power management control ECU.

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



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


    A249140E01


    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

    NOTICE:
    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.

  1. Install the IGCT NO. 3 fuse.

  1. Install the IGCT relay.

  1. Connect the power management control ECU connector.

  1. 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)


    A236717

  1. Check the connection of the inverter water pump assembly connector.

    OK:
    The connector is connected securely and there are no contact problems.



NG
Go to step 13
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.

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



    A249141E01

  1. 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

    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)

    NOTICE:
    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.

  1. Install the IGCT NO. 3 fuse.

  1. Connect the inverter water pump assembly connector.



NG
Go to step 14
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)