DTC    P0C73-776    Motor Electronics Coolant Pump "A" Control Performance

for Preparation Click here


DESCRIPTION

The inverter water pump assembly transmits rotation speed information to the power management control ECU (HV CPU). The power management control ECU (HV CPU) monitors the speed and detects malfunctions.

DTC No.
INF Code
DTC Detection Condition
Trouble Area
P0C73
776
A speed or intermittent stop malfunction occurs in the inverter water pump assembly.
  1. Inverter cooling system
  2. Wire harness or connector
  3. Inverter water pump assembly
  4. Power management control ECU

WIRING DIAGRAM


A204556E14


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.CHECK QUANTITY OF HV COOLANT

  1. Check the coolant level in the inverter reserve tank.

  1. Check for coolant leaks.
    Result 
    Result
    		Proceed to
    Coolant leaks are not evident. A sufficient amount of coolant remains in the inverter reserve tank.
    		A
    Coolant leaks are not evident. No coolant remains in the inverter reserve tank.
    		B
    Coolant leaks are evident.
    		C

    HINT:
    After repairing the coolant leaks and adding coolant, perform the "Activate the Water Pump" Active Test (HV Active Test item) and the "Control the Electric Cooling Fan" Active Test (Engine Active Test item) and make sure that there are no malfunctions.



B
Go to step 6

C
Go to step 7
A


2.CHECK COOLANT HOSE

  1. Check if the hoses of the cooling system are kinked or clogged.



NG
Go to step 8
OK


3.CHECK INVERTER WATER PUMP ASSEMBLY

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 / Data List.

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

  1. Read the Data List.

    Result:
    Tester Display
    		Specified Condition
    Inverter W/P Revolution
    		625 rpm or less

  1. Turn the power switch off.



NG
Go to step 9
OK


4.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:
    Tester Display
    		Specified Condition
    Inverter W/P Revolution
    		2250 to 5625 rpm

    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
Go to step 9
OK


5.CHECK HV COOLANT (CHECK FOR CONDITIONS THAT MAY HAVE CAUSED FREEZING)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Read the freeze frame data Ambient Temperature using the intelligent tester.

  1. Check if the freeze frame data Ambient Temperature is below freezing.

    Result:
    Result
    		Proceed to
    Ambient Temperature value is above freezing temperature of the HV coolant
    		A
    Ambient Temperature value is below freezing temperature of the HV coolant
    		B

    HINT:
    1. HV coolant (SLLC) with a 30% concentration freezes at -15°C (5°F) and HV coolant (SLLC) with a 50% concentration freezes at -35°C (-31°F).
    2. If the HV coolant freezes in the HV radiator or inverter water pump assembly, the coolant temperature in the inverter with converter assembly rises because the HV coolant cannot circulate. As a result, a DTC may be set.
    3. A DTC is set when the inverter water pump assembly impeller cannot rotate due to freezing of the HV coolant.
    4. If a DTC is set due to freezing of HV coolant, the problem cannot be reproduced. Judge whether freezing of HV coolant occurred according to the freeze point of the HV coolant, HV coolant change history and ambient temperature when the DTC was set.

  1. Turn the power switch off.



B
Go to step 20
A

REPLACE INVERTER WATER PUMP ASSEMBLY (Click here)  

6.ADD HV COOLANT

  1. Add coolant up to the high level in the reserve tank.



NEXT
Go to step 21

7.INSPECT FOR COOLANT LEAK

  1. Diagnose and repair the coolant leak.



NEXT
Go to step 21

8.CORRECT THE PROBLEM

  1. Correct the coolant hose.



NEXT
Go to step 21

9.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
Go to step 15
OK


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 16
OK


11.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.


    A209031E13


    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 (Check for Open):
    Tester Connection
    		Switch Condition
    		Specified Condition
    e1-3 (SWP) - A19-13 (IWP)
    		Power switch off
    		Below 1 Ω

    Standard Resistance (Check for Short):
    Tester Connection
    		Switch Condition
    		Specified Condition
    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
Go to step 17
OK


12.READ VALUE USING INTELLIGENT TESTER (INVERTER W/P REVOLUTION)

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 / ECU Data List.

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

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

  1. Read the Data List.

    Result:
    Tester Display
    		Specified Condition
    Inverter W/P Revolution
    		125 rpm or less

  1. Connect the inverter water pump assembly connector.

  1. Turn the power switch off.



NG
Go to step 18
OK


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

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

  1. Turn the power switch on (IG).



    A204443E16

  1. Measure the voltage according to the value(s) in the table below.
    Text in Illustration 
    *a
    		Rear view of wire harness connector
    (to Power Management Control ECU)

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A19-13 (IWP) - H3-6 (E1)
    		Power switch on (IG)
    		11 to 14 V

  1. Turn the power switch off.

  1. Connect the power management control ECU connector.



NG
REPLACE INVERTER WATER PUMP ASSEMBLY (Click here)
OK


14.CHECK POWER MANAGEMENT CONTROL ECU

  1. Turn the power switch on (IG).



    A249750E02

  1. While turning the power switch on (IG), check the waveform between the power management control ECU terminals.
    Text in Illustration 
    *a
    		Component with Harness Connected
    (Power Management Control ECU)

    OK:
    Waveform duty ratio is between 3% and 9%.

  1. Turn the power switch off.



NG
Go to step 19
OK

REPLACE INVERTER WATER PUMP ASSEMBLY (Click here)  

15.CONNECT SECURELY

  1. Connect the power management control ECU connectors securely.



NEXT
Go to step 21

16.CONNECT SECURELY

  1. Connect the inverter water pump assembly connector securely.



NEXT
Go to step 21

17.REPAIR OR REPLACE HARNESS OR CONNECTOR

  1. Repair or replace the wire harness or connector.



NEXT
Go to step 21

18.REPLACE POWER MANAGEMENT CONTROL ECU

  1. Replace the power management control ECU (Click here).



NEXT
Go to step 21

19.REPLACE POWER MANAGEMENT CONTROL ECU

  1. Replace the power management control ECU (Click here).



NEXT
Go to step 21

20.REPLACE HV COOLANT

  1. Replace the HV coolant with coolant having an appropriate concentration (appropriate freeze point) for the vehicle usage conditions (Click here).


NEXT


21.CHECK INVERTER WATER PUMP ASSEMBLY

  1. Perform a road test and check that DTCs are not stored.

    OK:
    DTCs are not stored.



NG
REPLACE INVERTER WATER PUMP ASSEMBLY (Click here)
OK

COMPLETED