P0A93-346

P310 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 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.

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.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

INSPECTION PROCEDURE
CAUTION:
- 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.
- 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.

PROCEDURE

1. DTC OUTPUT (HV)
(a) Put the vehicle into the READY-on state and wait for 10 seconds or more.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(e) Read output DTCs. Hybrid Control System

Result:
The DTC shown in the table below is output

YES -- GO TO DTC CHART
NO -- Continue to next step.
2. CHECK QUANTITY OF COOLANT (FOR INVERTER)
(a) Check the coolant level.
OK:
There is a sufficient amount of coolant.
NG -- CHECK FOR COOLANT LEAKS AND ADD COOLANT (FOR INVERTER)
OK -- Continue to next step.
3. CHECK COOLANT HOSE

(a) 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 -- Continue to next step.
4. CHECK CONNECTION CONDITION OF WATER PUMP CONNECTOR (LOOSENESS AND POOR CONTACT)

(a) 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 -- Continue to next step.
5. PERFORM ACTIVE TEST BY TECHSTREAM (WATER PUMP)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Select the following menu items: Powertrain / Hybrid Control / Active Test / Activate the Water Pump.
(d) During the "Activate 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 -- CHECK FUSE (INV W/P)
OK -- Continue to next step.
6. CHECK CONNECTION CONDITION OF COOLING FAN CONNECTOR (LOOSENESS AND POOR CONTACT)
(a) Check the connection of the electric cooling fan connector.
OK:
Connector is connected securely and there is no poor connection.
NG -- CONNECT SECURELY
OK -- Continue to next step.
7. PERFORM ACTIVE TEST BY TECHSTREAM (COOLING FAN)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Select the following menu items: Powertrain / Engine and ECT / Active Test / Control the Electric Cooling Fan.
(d) During the "Control the Electric 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 FUSE (INV W/P) P0A01-725

NG -- REPLACE FUSE (INV W/P)
OK -- Continue to next step.
9. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - WATER PUMP) P0A01-725

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
10. CHECK HYBRID VEHICLE CONTROL ECU
(a) Connect the HV control ECU connector.
(b) Turn the ignition switch to the ON position.

OK -- INSPECT HYBRID VEHICLE CONTROL ECU
NG -- Continue to next step.
11. INSPECT WATER PUMP W/ MOTOR & BRACKET ASSEMBLY

(a) Disconnect the H29 HV control ECU Connector.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:

NG -- REPLACE WATER PUMP W/ MOTOR & BRACKET ASSEMBLY
OK -- REPLACE HYBRID VEHICLE CONTROL ECU
12. INSPECT HYBRID VEHICLE CONTROL ECU
(a) Connect the HV control ECU connector.
(b) Put the vehicle into the READY-on state.

NG -- REPLACE HYBRID VEHICLE CONTROL ECU
OK -- REPLACE WATER PUMP W/ MOTOR & BRACKET ASSEMBLY