P0A93
L110F HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0A93-346: Inverter Cooling System Performance
P0A93-346 - Inverter Cooling System Performance
DESCRIPTION
The inverter converts the high-voltage direct current of the HV battery into the alternating current for MG2 and MG1. The inverter generates heat during the conversion process, and this heat could damage the inverter if the cooling system is malfunctioning. Therefore, similar to MG2 and MG1, the inverter is cooled by a special cooling system consisting of an electric water pump, the cooling fan, and a radiator. This cooling system is independent of the engine cooling system. The hybrid vehicle control ECU monitors the electric water pump, cooling fan, and cooling system, and detects malfunctions.
MONITOR DESCRIPTION
If the hybrid vehicle control ECU detects a malfunction of the electric water pump, fan or radiator, the ECU will illuminate the MIL and set a DTC.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
TYPICAL MALFUNCTION THRESHOLDS
COMPONENT OPERATING RANGE
CONFIRMATION DRIVING PATTERN
1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the power switch off.
5. Turn the power switch on (IG) and check that there are no abnormalities (abnormal sounds, coolant leaks, DTCs output, etc.).
6. Turn the power switch on (READY) and turn the Techstream on. [A]
7. Wait for 2 minutes or more.
8. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes. [B]
9. Check that the permanent DTCs are cleared.
10. If the permanent DTCs are not cleared, perform a universal trip, and then check for permanent DTCs again.
HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
INSPECTION PROCEDURE
CAUTION:
- Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
- After disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.
HINT
Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.
PROCEDURE
1. CHECK DTC OUTPUT (HV)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(d) Check if DTCs are output.
Result:
HINT
P0A93-346 may be set due to a malfunction which also causes DTCs in the preceding table to be set. In this case, first troubleshoot the output DTCs in the preceding table. Then, perform a test to attempt to reproduce the problems, and check that no DTCs are output.
B -- GO TO DTC CHART Hybrid Control System
A -- Continue to next step.
2. CHECK QUANTITY OF HV COOLANT P0A01-725
B -- ADD HV COOLANT
C -- CHECK FOR COOLANT LEAKS AND ADD COOLANT
A -- Continue to next step.
3. CHECK COOLANT HOSE P0A01-725
NG -- CORRECT THE PROBLEM
OK -- Continue to next step.
4. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE WATER PUMP) P0A01-725
NG -- PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE WATER PUMP)
OK -- Continue to next step.
5. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE ELECTRIC COOLING FAN) P0A01-725
NG -- CHECK COOLING FAN SYSTEM Cooling Fan Circuit
OK -- Continue to next step.
6. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) P0A01-725
NG -- CONNECT SECURELY
OK -- Continue to next step.
7. READ VALUE USING TECHSTREAM
(a) Stop the engine and leave the vehicle for at least 1 hour.
(b) Select the following menu items: Powertrain / Hybrid Control / Data List / Inverter Coolant Water Temperature, Inverter Temp-(MG2), Converter Temperature, Inverter Temp-(MG1).
(c) Read the data list.
Result:
NOTICE:
The lower limit temperature that can be displayed for "Inverter Temp (MG1)", "Inverter Temp (MG2)" and "Converter Temperature" is 59°F (15°C). The lower limit temperature for "Inverter Coolant Water Temperature" is -58°F (-50°C). The "Inverter Coolant Water Temperature" value displayed on the Techstream may be lower than the others, but this is not a malfunction.
B -- REPLACE WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY Components
A -- Continue to next step.
8. INSPECT COOLING SYSTEM (FOR CLOGGING) P0A01-725
NG -- REPLACE MALFUNCTIONING PARTS
OK -- REPLACE INVERTER WITH CONVERTER ASSEMBLY Installation
9. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE WATER PUMP) P0A01-725
NG -- CHECK FUSE (INV W/P)
OK -- ADD HV COOLANT
10. CHECK FUSE (INV W/P) P0A01-725
NG -- CHECK CONNECTOR CONNECTION CONDITION (WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY CONNECTOR)
OK -- Continue to next step.
11. CHECK CONNECTOR CONNECTION CONDITION (WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY CONNECTOR) P0A01-725
NG -- CONNECT SECURELY
OK -- Continue to next step.
12. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) P0A01-725
NG -- CONNECT SECURELY
OK -- Continue to next step.
13. CHECK HARNESS AND CONNECTOR (WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY) P0A01-725
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
14. CHECK WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY P0A01-725
NG -- REPLACE WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY Components
OK -- REPLACE HYBRID VEHICLE CONTROL ECU Service and Repair
15. CHECK CONNECTOR CONNECTION CONDITION (WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY CONNECTOR) P0A01-725
NG -- CONNECT SECURELY
OK -- Continue to next step.
16. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) P0A01-725
NG -- CONNECT SECURELY
OK -- Continue to next step.
17. CHECK HARNESS AND CONNECTOR (WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY) P0A01-725
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
18. CHECK WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY P0A01-725
NG -- REPLACE WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY Components
OK -- REPLACE HYBRID VEHICLE CONTROL ECU Service and Repair