Operation CHARM: Car repair manuals for everyone.
Home >> Lexus >> 2011 >> HS 250h L4-2.4L (2AZ-FXE) Hybrid >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0A93

P0A93





HYBRID / BATTERY 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 MG1 and MG2. The inverter generates heat during the conversion process. Therefore, 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 inverter cooling system, and detects the following malfunctions.





Text in Illustration









MONITOR DESCRIPTION

If the hybrid vehicle control ECU detects a malfunction of the electric water pump, cooling fan or HV cooling system, the ECU will illuminate the MIL and set a DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





WIRING DIAGRAM

Refer to the wiring diagram for DTC P0A01-725 P0A01.

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) Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

(d) Check if DTCs are output.

Result:









HINT
- *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic procedure.
- 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.

(e) Turn the power switch off.

B -- GO TO DTC CHART Hybrid Control System
A -- Continue to next step.

2. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) P0343

NG -- CONNECT SECURELY
OK -- Continue to next step.

3. CHECK QUANTITY OF HV COOLANT P0A01

C -- CHECK FOR COOLANT LEAKS AND ADD COOLANT

B -- ADD COOLANT
A -- Continue to next step.

4. CHECK COOLANT HOSE P0A01

NG -- CORRECT THE PROBLEM
OK -- Continue to next step.

5. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE WATER PUMP) P0A01

NG -- PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE WATER PUMP)
OK -- Continue to next step.

6. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE ELECTRIC COOLING FAN) P0A01

NG -- CHECK COOLING FAN SYSTEM Cooling Fan Circuit
OK -- Continue to next step.

7. READ VALUE USING TECHSTREAM

(a) Turn the power switch off and leave the vehicle for at least 1 hour.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch on (IG).

(d) Enter the following menus: Powertrain / Hybrid Control / Data List / Inverter Coolant Water Temperature, Inverter Temp (MG2), Converter Temperature, Inverter Temp (MG1).

(e) 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.

(f) Turn the power switch off.

B -- REPLACE INVERTER WITH CONVERTER ASSEMBLY Components
A -- Continue to next step.

8. CHECK HV COOLANT (CHECK FOR CONDITIONS THAT MAY HAVE CAUSED FREEZING) P0A01

B -- REPLACE HV COOLANT

A -- REPLACE WATER PUMP WITH MOTOR ASSEMBLY Components

9. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE WATER PUMP) P0A01

B -- ADD COOLANT
A -- Continue to next step.

10. CHECK FUSE (IGCT NO. 3) P0A01

NG -- CHECK CONNECTOR CONNECTION CONDITION (WATER PUMP WITH MOTOR ASSEMBLY CONNECTOR)
OK -- Continue to next step.

11. CHECK CONNECTOR CONNECTION CONDITION (WATER PUMP WITH MOTOR ASSEMBLY CONNECTOR) P0A01

NG -- CONNECT SECURELY
OK -- Continue to next step.

12. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) P0343

NG -- CONNECT SECURELY
OK -- Continue to next step.

13. CHECK HARNESS AND CONNECTOR (WATER PUMP WITH MOTOR ASSEMBLY CIRCUIT) P0A01

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

14. CHECK WATER PUMP WITH MOTOR ASSEMBLY P0A01

NG -- REPLACE WATER PUMP WITH MOTOR ASSEMBLY Components

OK -- REPLACE HYBRID VEHICLE CONTROL ECU Components

15. REPLACE HV COOLANT P0A01

NEXT -- Continue to next step.

16. CHECK WATER PUMP WITH MOTOR ASSEMBLY P0A01

NG -- REPLACE WATER PUMP WITH MOTOR ASSEMBLY Components

OK -- COMPLETED

17. CHECK CONNECTOR CONNECTION CONDITION (WATER PUMP WITH MOTOR ASSEMBLY CONNECTOR) P0A01

NG -- CONNECT SECURELY
OK -- Continue to next step.

18. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) P0343

NG -- CONNECT SECURELY
OK -- Continue to next step.

19. CHECK HARNESS AND CONNECTOR (WATER PUMP WITH MOTOR ASSEMBLY CIRCUIT) P0A01

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

20. CHECK WATER PUMP WITH MOTOR ASSEMBLY P0A01

NG -- REPLACE WATER PUMP WITH MOTOR ASSEMBLY
OK -- Continue to next step.

21. REPLACE HYBRID VEHICLE CONTROL ECU P0A01

NEXT -- REPLACE FUSE (IGCT NO. 3)

22. CONNECT SECURELY P0A01

NEXT -- REPLACE FUSE (IGCT NO. 3)

23. CONNECT SECURELY P0A01

NEXT -- REPLACE FUSE (IGCT NO. 3)

24. REPAIR OR REPLACE HARNESS OR CONNECTOR P0A01

NEXT -- REPLACE FUSE (IGCT NO. 3)

25. REPLACE WATER PUMP WITH MOTOR ASSEMBLY P0A01

NEXT -- REPLACE FUSE (IGCT NO. 3)
pro multis · About Operation CHARM