P0A93-346

DESCRIPTION

The inverter converts the high-voltage direct current of the HV battery into the alternating current for the Motor, Generator, and Rear Motor. The inverter generates heat during the conversion process, and this heat could damage the inverter if a cooling system is unavailable. Therefore, similar to the Motor and Generator, the inverter is cooled by a special system consisting of an electric water pump, cooling fan, and radiator. This cooling system is independent of the engine cooling system. The HV control ECU monitors the electric water pump, cooling fan, and cooling system, and detects a malfunction.

DTC No.	INF Code	DTC Detection Condition	Trouble Area
P0A93	346	Inverter cooling system malfunction (HV coolant malfunction)	Wire harness or connector Inverter cooling system Water pump w/ motor & bracket assembly Cooling fan circuit w/ converter inverter assembly (MG ECU) HV control ECU
↑	347	Inverter cooling system malfunction (radiator fan malfunction)	Wire harness or connector Inverter cooling system Water pump w/ motor & bracket assembly Cooling fan circuit w/ converter inverter assembly (MG ECU) HV control ECU

MONITOR DESCRIPTION

If the HV control ECU detects malfunction in the electric water pump, fan or radiator, it illuminates the MIL and sets a DTC.

INSPECTION PROCEDURE

CAUTION:

1. Before inspecting the high-voltage system, take safety precautions to prevent electrical shocks, such as wearing insulated gloves and removing the service plug grip. After removing the service plug grip, put it in your pocket to prevent other technicians from reconnecting it while you are working on the high-voltage system.
   
2. After disconnecting the service plug grip, wait for at least 5 minutes before touching any of the high-voltage connectors or terminals.
   

HINT:

At least 5 minutes is required to discharge the high-voltage capacitor inside the w/ converter inverter assembly.

1. READ OUTPUT DTC (HV)

1. Put the vehicle into the READY-on state and wait for 10 seconds or more.

2. Connect the intelligent tester to the DLC3.

3. Turn the ignition switch to the ON position.

4. Select the following menu items: Powertrain / Hybrid Control / DTC.

5. Read output DTCs. (Click here)

   Result:

   The DTC shown in the table below is output:

   DTC No.	Relevant Diagnosis
   P0A05-776	Water pump malfunction

YES	GO TO DTC CHART

NO

2. CHECK QUANTITY OF HV COOLANT

1. Check the inverter coolant level.

   OK:

   There is sufficient amount of coolant for the inverter.
   

NG	CHECK FOR COOLANT LEAKS AND ADD COOLANT

OK

3. CHECK COOLANT HOSE

1. Check if the hoses of the cooling system are not bent or clogged.

   OK:

   The hoses of the cooling system are not bent or clogged.
   

NG	CORRECT TO NORMAL CONDITION

OK

4. CHECK CONNECTION CONDITION OF WATER PUMP CONNECTOR (LOOSENESS AND POOR CONTACT)

1. Check the connection of the water pump w/ motor connector.

   OK:

   Connector is connected securely and there is no poor connection.
   

NG	CONNECT SECURELY

OK

5. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (WATER PUMP)

1. Connect the intelligent tester to the DLC3.

2. Turn the ignition switch to the ON position.

3. Select the following menu items: Powertrain / Hybrid Control / Active Test / Active Water Pump.

4. During the water pump active test, check operation of the water pump.

   OK:

   There are ripples in the reservoir tank coolant.
   

   HINT:

   The water pump is also activated in the READY-on state.

NG	Go to step 8

OK

6. CHECK CONNECTION CONDITION OF COOLING FAN CONNECTOR (LOOSENESS AND POOR CONTACT)

1. Check the connection of the electric cooling fan connector.

   OK:

   Connector is connected securely and there is no poor connection.
   

NG	CONNECT SECURELY

OK

7. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (COOLING FAN)

1. Connect the intelligent tester to the DLC3.

2. Turn the ignition switch to the ON position.

3. Select the following menu items: Powertrain / Engine / Active Test / Cooling Fan.

4. During the cooling fan activate test, check operation of the electric cooling fan.

   OK:

   The electric cooling fan operates.
   

NG	CHECK COOLING FAN CIRCUIT

OK
REPLACE W/ CONVERTER INVERTER ASSEMBLY

8. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - WATER PUMP)

1. Turn the ignition switch off.

2. Disconnect the H29 connector from the HV control ECU.

3. Disconnect the W5 water pump connector.

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

   Standard Resistance (Check for open):

   Tester Connection	Specified Condition
   NIWP (H29-29) - NWP (W5-1)	Below 1 Ω
   IWP (H29-23) - SWP (W5-2)	Below 1 Ω

   Standard (Check for short):

   Tester Connection	Specified Condition
   NIWP (H29-29) or NWP (W5-1)- Body ground	10 kΩ or higher
   IWP (H29-23) or SWP (W5-2)- Body ground	10 kΩ or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

9. CHECK HARNESS AND CONNECTOR (WATER PUMP - INV W/P FUSE, WATER PUMP - BODY GROUND)

1. Turn the ignition switch off.

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

   Standard Resistance (Check for open):

   Tester Connection	Specified Condition
   +B (W5-4) - Engine Room R/B No.4 INV W/P fuse terminal 2	Below 1 Ω
   GND (W5-3) - Body ground	Below 1 Ω

   Standard Resistance (Check for short):

   Tester Connection	Specified Condition
   +B (W5-4) or Engine Room R/B No.4 INV W/P fuse terminal 2 - Body ground	10 kΩ or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

10. CHECK HYBRID VEHICLE CONTROL ECU

1. Connect the HV control ECU connector.

2. Put the vehicle into the READY-on state.

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

   Standard Voltage:

   Tester Connection	Specified Condition
   IWP (H29-23) - Body ground	Below 1 V

OK	Go to step 12

NG

11. INSPECT WATER PUMP W/ MOTOR & BRACKET ASSEMBLY

1. Disconnect the H29 HV control ECU Connector.

2. Turn the ignition switch to the ON position.

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

   Standard Voltage:

   Tester Connection	Specified Condition
   IWP (H29-23) - E1 (H32-5)	10 to 14 V

NG	REPLACE WATER PUMP W/ MOTOR & BRACKET ASSEMBLY

OK
REPLACE HYBRID VEHICLE CONTROL ECU

12. INSPECT HYBRID VEHICLE CONTROL ECU

1. Connect the HV control ECU connector.

2. Put the vehicle into the READY-on state.

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

   Standard Voltage:

   Tester Connection	Specified Condition
   IWP (H29-23) - E7 (H32-5)	10 to 14 V

NG	REPLACE HYBRID VEHICLE CONTROL ECU

OK
REPLACE WATER PUMP W/ MOTOR & BRACKET ASSEMBLY