P0A93-346

P112 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0A93-346: Inverter Cooling System Performance

DTC P0A93-346 - Inverter Cooling System Performance

DTC P0A93-347 - Inverter Cooling System Performance

DESCRIPTION

The inverter converts the high-voltage direct current of the HV battery into the alternating current for the MG1 and the MG2. 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 MG1 and the MG2, the inverter is cooled by a dedicated cooling system, which consists 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.





MONITOR DESCRIPTION

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

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





INSPECTION PROCEDURE

PROCEDURE

1. CHECK QUANTITY OF HV COOLANT
(a) Check that there is a sufficient amount of coolant for the inverter.
OK:
There is a sufficient amount of coolant for the inverter
NG -- ADD HV COOLANT
OK -- Continue to next step.
2. CHECK COOLANT HOSE
(a) Check that the hoses of the cooling system are not bent or clogged (refer to the cooling system).
OK:
The hoses of the cooling system are not bent or clogged
NG -- CORRECT TO NORMAL CONDITION
OK -- Continue to next step.
3. CHECK CONNECTION CONDITION OF WATER PUMP CONNECTOR (LOOSENESS AND POOR CONTACT)





(a) Check the connection condition of the water pump connector.
OK:
Connector has been connected securely and there is no poor connection.
NG -- CONNECT SECURELY
OK -- Continue to next step.
4. CHECK WATER PUMP WITH MOTOR ASSEMBLY
(a) Turn the power switch ON (IG).
(b) Check the operation of the water pump.
OK:
Coolant is sloshing in the reservoir tank
NG -- REPLACE WATER PUMP WITH MOTOR ASSEMBLY
OK -- Continue to next step.
5. CHECK CONNECTION CONDITION OF COOLING FAN MOTOR CONNECTOR (LOOSENESS AND POOR CONTACT)





(a) Check the connection condition of the cooling fan motor connectors.
OK:
Connectors have been connected securely and there is no poor connection.
NG -- CONNECT SECURELY
OK -- Continue to next step.
6. INSPECT COOLING FAN MOTOR
(a) Inspect the cooling fan motor (Testing and Inspection).
NG -- REPLACE COOLING FAN MOTOR AND ADD ENGINE COOLANT
OK -- Continue to next step.
7. INSPECT NO. 2 COOLING FAN MOTOR
(a) Inspect the No. 2 cooling fan motor (Testing and Inspection).
NG -- REPLACE NO. 2 COOLING FAN MOTOR AND ADD ENGINE COOLANT
OK -- REPLACE INVERTER WITH CONVERTER ASSEMBLY