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Home >> Toyota >> 2010 >> Camry 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





P311 HYBRID VEHICLE 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.

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





MONITOR DESCRIPTION

If the motor inverter detects a circuit malfunction, it transmits a motor inverter fail signal to the MG ECU. Upon receiving this signal, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





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 inspection, 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) Select the following menu items: 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 flowchart.
- Turning the power switch on (IG) with the service plug grip and inverter cover removed causes interlock switch system DTC P0A0D-350 to be output.
- P0A78-286 may be output due to a malfunction which causes the DTCs in the table above to be output. In this case, first troubleshoot the output DTCs in the table above. Then, perform a reproduction test to check that no DTCs are output.
YES -- GO TO DTC CHART
NO -- Continue to next step.

2. CHECK QUANTITY OF HV COOLANT P0A93

C -- CHECK FOR COOLANT LEAKS AND ADD COOLANT

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

3. CHECK COOLANT HOSE P0A93

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

4. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE WATER PUMP) P0A93

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) P0A93

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

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

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

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

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

8. CHECK GENERATOR RESOLVER P0A1A

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

9. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER) P0A1B

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

10. CHECK MOTOR RESOLVER P0A1B

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

11. CHECK INVERTER WITH CONVERTER ASSEMBLY (GENERATOR CABLE CONNECTION CONDITION) P0A1B

NG -- TIGHTEN TO SPECIFIED TORQUE
OK -- Continue to next step.

12. CHECK INVERTER WITH CONVERTER ASSEMBLY (MOTOR CABLE CONNECTION CONDITION) P0A1B

NG -- TIGHTEN TO SPECIFIED TORQUE
OK -- Continue to next step.

13. CHECK HYBRID VEHICLE TRANSAXLE ASSEMBLY (MG1) P0A1B

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

14. CHECK HYBRID VEHICLE TRANSAXLE ASSEMBLY (MG2) P0A1B

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

15. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR) P0A1A

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

16. CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR) P0A1B

NG -- CONNECT SECURELY

OK -- REPLACE INVERTER WITH CONVERTER ASSEMBLY Components

17. CHECK CONNECTOR CONNECTION CONDITION (COOLING FAN MOTOR CONNECTOR) P0A93

NG -- CONNECT SECURELY

OK -- CHECK COOLING FAN SYSTEM Testing and Inspection

18. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE WATER PUMP) P0A93

OK -- ADD COOLANT
NG -- Continue to next step.

19. CHECK FUSE (INV W/P FUSE) P0A93

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

20. CHECK ENGINE ROOM R/B P0A93

NG -- REPAIR OR REPLACE ENGINE ROOM R/B
OK -- Continue to next step.

21. CHECK CONNECTOR CONNECTION CONDITION (WATER PUMP WITH MOTOR & BRACKET ASSEMBLY CONNECTOR) P0A93

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

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

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

23. CHECK HARNESS AND CONNECTOR (WATER PUMP WITH MOTOR POWER SOURCE CIRCUIT) P0A93

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

24. CHECK WATER PUMP WITH MOTOR & BRACKET ASSEMBLY P0A93

NG -- REPLACE WATER PUMP WITH MOTOR & BRACKET ASSEMBLY Components

OK -- REPLACE HYBRID VEHICLE CONTROL ECU Components

25. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR) P0A1A

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

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

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY Components

27. CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR) P0A1B

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

28. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER) P0A1B

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY Components

29. CHECK CONNECTOR CONNECTION CONDITION (WATER PUMP WITH MOTOR & BRACKET ASSEMBLY CONNECTOR) P0A93

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

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

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

31. CHECK HARNESS AND CONNECTOR (WATER PUMP WITH MOTOR POWER SOURCE CIRCUIT) P0A93

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

32. CHECK WATER PUMP WITH MOTOR & BRACKET ASSEMBLY P0A93

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

33. REPLACE HYBRID VEHICLE CONTROL ECU P0A93

NEXT -- REPLACE FUSE (INV W/P)

34. CONNECT SECURELY P0A93

NEXT -- REPLACE FUSE (INV W/P)

35. CONNECT SECURELY P0A93

NEXT -- REPLACE FUSE (INV W/P)

36. REPAIR OR REPLACE HARNESS OR CONNECTOR P0A93

NEXT -- REPLACE FUSE (INV W/P)

37. REPLACE WATER PUMP WITH MOTOR & BRACKET ASSEMBLY P0A93

NEXT -- REPLACE FUSE (INV W/P)
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