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Home >> Lexus >> 2010 >> GS 450h V6-3.5L (2GR-FSE) Hybrid >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0A78 >> P0A78-286 - Drive Motor "A" Inverter Performance >> Part 2

Part 2

18. CHECK FUSE (INV W/P)

(a) Check the fuse (INV W/P) in the engine room R/B No. 1 for improper installation and open circuits.





Result:

The fuse is installed securely. There is no open circuit in the fuse.

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

19. CHECK INTEGRATION NO.1 RELAY

(a) Remove the integration relay from the engine room R/B No. 1.





(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:





(c) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPLACE INTEGRATION NO.1 RELAY
OK -- Continue to next step.

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

(a) Check the connection of the water with motor pump assembly connector.





Result:

The connector is connected securely and there are no contact problems.
NG -- CONNECT SECURELY
OK -- Continue to next step.

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

(a) Turn the power switch off.

(b) Check the connections of the hybrid vehicle control ECU connectors.





Result:

The connectors are connected securely and there are no contact problems.

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

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

(a) Remove the integration relay from the engine room R/B No. 1.

(b) Measure the resistance according to the value(s) in the table below.





Standard resistance (Check for open):





Standard resistance (Check for short):





(c) Disconnect connector A49 from the water with motor pump assembly.

(d) Disconnect connector A54 from the hybrid vehicle control ECU.

(e) Measure the resistance according to the value(s) in the table below.





Standard resistance (Check for open):




Standard resistance (Check for short):





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

23. CHECK WATER WITH MOTOR PUMP ASSEMBLY

(a) Disconnect connector A54 from the hybrid vehicle control ECU.





(b) Remove the integration relay from the engine room R/B No. 1.

(c) Apply 12 V to terminal 4 of integration relay vehicle side connector 1V and check that the water with motor pump assembly operates.

OK:

The water with motor pump assembly operates.

NG -- REPLACE WATER WITH MOTOR PUMP ASSEMBLY Components

OK -- REPLACE HYBRID VEHICLE CONTROL ECU Service and Repair

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

(a) Check the connection of the water with motor pump assembly connector.





OK:

The connector is connected securely and there are no contact problems.

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

25. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)

(a) Check the connections of the hybrid vehicle control ECU connectors.





OK:

The connectors are connected securely and there are no contact problems.

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

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

(a) Remove the integration relay from the engine room R/B No. 1.

(b) Measure the resistance according to the value(s) in the table below.





Standard resistance (Check for open):





Standard resistance (Check for short):





(c) Disconnect connector A49 from the water with motor pump assembly.

(d) Disconnect connector A54 from the hybrid vehicle control ECU.

(e) Measure the resistance according to the value(s) in the table below.





Standard resistance (Check for open):





Standard resistance (Check for short):





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

27. CHECK WATER WITH MOTOR PUMP ASSEMBLY

(a) Disconnect connector A54 from the hybrid vehicle control ECU.





(b) Remove the integration relay from the engine room R/B No. 1.

(c) Apply 12 V to terminal 4 of integration relay vehicle side connector 1V and check that the water pump operates.

OK:

The water pump operates.

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

28. REPAIR OR REPLACE HYBRID VEHICLE CONTROL ECU

(a) Replace the hybrid vehicle control ECU Service and Repair.

NEXT -- REPLACE FUSE (INV W/P)


29. CONNECT SECURELY

(a) Connect the water with motor pump assembly connector securely.

NEXT -- REPLACE FUSE (INV W/P)

30. CONNECT SECURELY

(a) Connect the hybrid vehicle control ECU connector securely.

NEXT -- REPLACE FUSE (INV W/P)

31. REPAIR OR REPLACE HARNESS OR CONNECTOR

(a) Repair or replace the harness or connector.

NEXT -- REPLACE FUSE (INV W/P)

32. REPLACE WATER WITH MOTOR PUMP ASSEMBLY

(a) Replace the water with motor pump assembly Components.

NEXT -- REPLACE FUSE (INV W/P)

33. CHECK CONNECTOR CONNECTION CONDITION (COOLING FAN ECU CONNECTOR)

(a) Check the connections of the cooling fan connectors.





Result:

The connectors are connected securely and there are no contact problems.

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

34. CHECK CONNECTOR CONNECTION CONDITION (ECM CONNECTOR)

(a) Check the connections of the ECM connectors.





Result:

The connectors are connected securely and there are no contact problems.

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

35. CHECK COOLING FAN MOTOR

(a) Disconnect the cooling fan motor connector.





(b) Apply 12 V to the cooling fan motor and check that the cooling fan rotates.

OK:

The cooling fan rotates.

NG -- REPLACE COOLING FAN MOTOR Components
OK -- Continue to next step.

36. CHECK COOLING FAN ECU

(a) Connect the cooling fan motor connector.





(b) Disconnect the cooling fan ECU connector.

(c) Apply 12 V to the cooling fan ECU and check that the cooling fan rotates.

OK:

The cooling fan rotates.

NG -- REPLACE COOLING FAN ECU
OK -- Continue to next step.

37. CHECK HARNESS AND CONNECTOR (ECM - COOLING FAN ECU)

(a) Disconnect the ECM connector.

(b) Measure the resistance according to the value(s) in the table below.





Standard resistance (Check for open):





Standard resistance (Check for short):





(c) Remove the FAN MAIN relay from the engine room R/B No. 1.

(d) Measure the resistance according to the value(s) in the table below.





Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM Components

38. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR)

(a) Check the connection of the generator resolver connector.





Result:

The connector is connected securely and there are no contact problems.

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

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

(a) Disconnect connector E87 from the generator resolver.





(b) Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open):





Standard resistance (Check for short):





HINT
The generator resolver is not available separately. If it requires replacement, replace the hybrid vehicle transmission assembly.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Components

40. CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR)

(a) Check the connection of the motor resolver connector.





Result:

The connector is connected securely and there are no contact problems.

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

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

(a) Disconnect connector E88 from the motor resolver.





(b) Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open):





Standard resistance (Check for short):





HINT
The motor resolver is not available separately. If it requires replacement, replace the hybrid vehicle transmission assembly.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Components

42. CHECK HYBRID VEHICLE TRANSMISSION ASSEMBLY (GENERATOR CABLE CONNECTION CONDITION)

CAUTION:
Be sure to wear insulated gloves.


(a) Turn the power switch off and remove the service plug grip L110 Hybrid Vehicle Control System.

NOTICE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

(b) Remove the hybrid vehicle transmission assembly Components.





(c) Check for arc marks at the bolts for the generator cable.

(d) Check that the bolts for the generator cable are tightened to the specified torque, the generator cable terminals are connected securely, and there are no contact problems.

NOTICE:
Make sure that the tightening torque of the bolts is between 6.4 and 9.6 N*m (65 and 98 kgf*cm, 57 and 85 in.*lbf).

Torque : 8.0 Nm (82 kgf-cm, 71 in-lbf)

Result:





C -- REPLACE MALFUNCTIONING PARTS

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

43. CHECK GENERATOR CABLE

CAUTION:
Be sure to wear insulated gloves.

(a) Check that the service plug grip is not installed.

(b) Remove the generator cable from the transmission Components.

(c) Using a megohmmeter set to 500 V, measure the resistance according to the value(s) in the table below.





NOTICE:

Be sure to set the megohmmeter to 500 V when performing this test. Using a setting higher than 500 V can result in damage to the component being inspected.

Standard resistance:





(d) Measure the resistance of each conductor in the generator cable according to the value(s) in the table below.

Standard resistance:





NG -- REPLACE GENERATOR CABLE

OK -- REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Components

44. CHECK HYBRID VEHICLE TRANSMISSION ASSEMBLY (MOTOR CABLE CONNECTION CONDITION)

CAUTION:
Be sure to wear insulated gloves.

(a) Remove the hybrid vehicle transmission assembly.






(b) Check for arc marks at the bolts for the motor cable.

(c) Check that the bolts for the motor cable are tightened to the specified torque, the motor cable terminals are connected securely, and there are no contact problems.

NOTICE:
Make sure that the tightening torque of the bolts is between 6.4 and 9.6 N*m (65 and 98 kgf*cm, 57 and 85 in.*lbf).

Torque : 8.0 Nm (82 kgf-cm, 71 in-lbf)

Result:





C -- REPLACE MALFUNCTIONING PARTS

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

45. CHECK MOTOR CABLE

CAUTION:

Be sure to wear insulated gloves.

(a) Remove the motor cable from the transmission.

(b) Using a megohmmeter set to 500 V, measure the resistance according to the value(s) in the table below.





NOTICE:
Be sure to set the megohmmeter to 500 V when performing this test. Using a setting higher than 500 V can result in damage to the component being inspected.

Standard resistance:





(c) Measure the resistance of each conductor in the motor cable according to the value(s) in the table below.

Standard resistance:





NG -- REPLACE MOTOR CABLE

OK -- REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY Components
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