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Home >> Lexus >> 2012 >> HS 250h L4-2.4L (2AZ-FXE) Hybrid >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0A78 >> P0A78-286

P0A78-286





HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM: P0A78-286: Drive Motor "A" Inverter Performance
P0A78-286 - Drive Motor "A" Inverter Performance

DESCRIPTION

For a description of the inverter, P0A78-266.

If the motor inverter overheats, has a circuit malfunction, or has an internal short, the inverter transmits this information to the MG ECU via the motor inverter fail signal line.





MONITOR DESCRIPTION

If the motor inverter detects a circuit malfunction, it will transmit a motor inverter fail signal to the MG ECU. Upon receiving this information, the hybrid vehicle control 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, DTC output, etc).

6. Turn the power switch on (READY) and turn the Techstream on. [A]

7. With park (P) selected, wait for several seconds.

8. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes. [B]

9. Check that 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.

WIRING DIAGRAM

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

Refer to the wiring diagram for DTC P0A1A-200 P0A1A-200.

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.
NOTICE:
After troubleshooting and repairing all output DTCs, be sure to replace the inverter with converter assembly.

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.
- P0A78-286 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. After troubleshooting and repairing all output DTCs, be sure to replace the inverter with converter assembly.

(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 P0A01-725

B -- ADD COOLANT

C -- CHECK FOR COOLANT LEAKS AND ADD COOLANT
A -- Continue to next step.

4. CHECK COOLANT HOSE P0A01-725

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

5. 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.

6. 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.

7. CHECK HV COOLANT (CHECK FOR CONDITIONS THAT MAY HAVE CAUSED FREEZING) P0A01-725

B -- REPLACE HV COOLANT
A -- Continue to next step.

8. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR RESOLVER) P0A1A-200

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

9. CHECK GENERATOR RESOLVER P0A1A-200

NG -- CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR)
OK -- Continue to next step.

10. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER) P0A1A-200

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

11. CHECK MOTOR RESOLVER P0A1A-200

NG -- CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR)
OK -- Continue to next step.

12. CHECK INVERTER WITH CONVERTER ASSEMBLY (GENERATOR CABLE CONNECTION CONDITION) P0A1B-788

B -- REPLACE MALFUNCTIONING PARTS

C -- CONNECT SECURELY
A -- Continue to next step.

13. CHECK INVERTER WITH CONVERTER ASSEMBLY (MOTOR CABLE CONNECTION CONDITION) P0A1B-788

B -- REPLACE MALFUNCTIONING PARTS

C -- CONNECT SECURELY
A -- Continue to next step.

14. CHECK HYBRID VEHICLE TRANSAXLE ASSEMBLY (MG1) P0A1B-788

NG -- REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY Components
OK -- Continue to next step.

15. CHECK HYBRID VEHICLE TRANSAXLE ASSEMBLY (MG2) P0A1B-788

NG -- REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY Components
OK -- Continue to next step.

16. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR) P0A1A-200

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

17. CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR) P0A1A-200

NG -- CONNECT SECURELY

OK -- REPLACE INVERTER WITH CONVERTER ASSEMBLY Components

18. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE WATER PUMP) P0A01-725

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

19. CHECK FUSE (IGCT NO. 3) P0A01-725

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

20. CHECK CONNECTOR CONNECTION CONDITION (WATER PUMP WITH MOTOR ASSEMBLY CONNECTOR) P0A01-725

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

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

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

22. CHECK HARNESS AND CONNECTOR (WATER PUMP WITH MOTOR ASSEMBLY CIRCUIT) P0A01-725

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

23. CHECK WATER PUMP WITH MOTOR ASSEMBLY P0A01-725

NG -- REPLACE WATER PUMP WITH MOTOR ASSEMBLY Components

OK -- REPLACE HYBRID VEHICLE CONTROL ECU Components

24. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR) P0A1A-200

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

25. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR RESOLVER) P0A1A-200

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY Components

26. CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR) P0A1A-200

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

27. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER) P0A1A-200

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY Components

28. CHECK CONNECTOR CONNECTION CONDITION (WATER PUMP WITH MOTOR ASSEMBLY CONNECTOR) P0A01-725

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

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

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

30. CHECK HARNESS AND CONNECTOR (WATER PUMP WITH MOTOR ASSEMBLY CIRCUIT) P0A01-725

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

31. CHECK WATER PUMP WITH MOTOR ASSEMBLY P0A01-725

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

32. REPLACE HYBRID VEHICLE CONTROL ECU P0A01-725

NEXT -- REPLACE FUSE (IGCT NO. 3)

33. CONNECT SECURELY P0A01-725

NEXT -- REPLACE FUSE (IGCT NO. 3)

34. CONNECT SECURELY P0A01-725

NEXT -- REPLACE FUSE (IGCT NO. 3)

35. REPAIR OR REPLACE HARNESS OR CONNECTOR P0A01-725

NEXT -- REPLACE FUSE (IGCT NO. 3)

36. REPLACE WATER PUMP WITH MOTOR ASSEMBLY P0A01-725

NEXT -- REPLACE FUSE (IGCT NO. 3)

37. REPLACE HV COOLANT P0A01-725

NEXT -- Continue to next step.

38. CHECK WATER PUMP WITH MOTOR ASSEMBLY P0A01-725

NG -- REPLACE WATER PUMP WITH MOTOR ASSEMBLY Components

OK -- COMPLETED
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