DTC P0A7A-203: Generator Inverter Performance [08/2013 - ]: Procedure

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

CHECK HYBRID VEHICLE TRANSAXLE ASSEMBLY (MG1) See step 11
NG → See step 4

OK: Go to next step
REPLACE INVERTER WITH CONVERTER ASSEMBLY
Refer to COMPONENTS [08/2013 - ]

NEXT: Go to next step

CHECK DTC OUTPUT (HYBRID CONTROL)

Check the other DTCs that were output together with DTC P0A7A-203.

RESULT

DTC No.	Relevant Diagnosis
P0A7A-122, 130, 322, 324, 325, 517, 518, 809, 810, 811	Generator Inverter Performance

NOTE:

DTC P0A7A-203 is stored after any of DTCs P0A7A-122, 130, 322, 324, 325, 517, 518, 809, 810 and 811 are stored. After troubleshooting and repairing the malfunction which caused DTC P0A7A-203 to be stored be sure to troubleshoot all the other DTCs.

NEXT → See step 16

CHECK GENERATOR CABLE See step 27
NG → See step 8

OK: Go to next step
REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY
Refer to COMPONENTS [08/2013 - ]

NEXT: Go to next step
REPLACE INVERTER WITH CONVERTER ASSEMBLY
Refer to COMPONENTS [08/2013 - ]

NEXT: Go to next step

CHECK DTC OUTPUT (HYBRID CONTROL)

Check the other DTCs that were output together with DTC P0A7A-203.

RESULT

DTC No.	Relevant Diagnosis
P0A7A-122, 130, 322, 324, 325, 517, 518, 809, 810, 811	Generator Inverter Performance

NOTE:

NEXT → See step 16

CHECK HYBRID VEHICLE TRANSAXLE ASSEMBLY (MG1)

WARNING:

Be sure to wear insulated gloves.

Check that the service plug grip is not installed.
NOTE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the service information because this may cause a malfunction.
Remove the inverter with converter assembly.
Disconnect the generator cable from the hybrid vehicle transaxle assembly.

Check MG1 for an interphase short using a milliohmmeter.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using a milliohmmeter, measure the resistance according to the value(s) in the table below.

HINT:

If the MG1 temperature is high, the resistance will vary greatly from the specification. Therefore, measure the resistance at least 8 hours after the vehicle is stopped.

Standard Resistance

Tester Connection	Condition	Specified Condition
e2-1 (W) - e2-3 (U)	Power switch off	56.0 to 62.0 mΩ
e2-2 (V) - e2-1 (W)	Power switch off	56.0 to 62.0 mΩ
e2-3 (U) - e2-2 (V)	Power switch off	59.0 to 65.0 mΩ

TEXT IN ILLUSTRATION

*a	Component without generator cable connected (Hybrid Vehicle Transaxle Assembly)

HINT:

To correct the variation of the measured resistance due to temperature, use the following formula to calculate the resistance at 20°C (68°F).

R20 = Rt / {1 + 0.00393 X (T - 20)}

The calculation is based on the following:

R20: Resistance at x 20°C (68°F) (mΩ)
Rt: Measured resistance (mΩ)
T: Temperature when the resistance is measured (°C)

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

NOTE:

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

Tester Connection	Condition	Specified Condition
e2-1 (W) - Body ground and shield ground	Power switch off	100 MΩ or higher
e2-2 (V) - Body ground and shield ground	Power switch off	100 MΩ or higher
e2-3 (U) - Body ground and shield ground	Power switch off	100 MΩ or higher

Connect the generator cable.
Install the inverter with converter assembly.

NG → See step 12

OK: Go to next step

REPLACE GENERATOR CABLE
Refer to COMPONENTS [08/2013 - ]

NEXT: Go to next step
REPLACE INVERTER WITH CONVERTER ASSEMBLY
Refer to COMPONENTS [08/2013 - ]

NEXT: Go to next step

CHECK DTC OUTPUT (HYBRID CONTROL)

Check the other DTCs that were output together with DTC P0A7A-203.

RESULT

DTC No.	Relevant Diagnosis
P0A7A-122, 130, 322, 324, 325, 517, 518, 809, 810, 811	Generator Inverter Performance

NOTE:

NEXT → See step 16

REPLACE GENERATOR CABLE
Refer to COMPONENTS [08/2013 - ]

NEXT: Go to next step
REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY
Refer to COMPONENTS [08/2013 - ]

NEXT: Go to next step
REPLACE INVERTER WITH CONVERTER ASSEMBLY
Refer to COMPONENTS [08/2013 - ]

NEXT: Go to next step

CHECK DTC OUTPUT (HYBRID CONTROL)

Check the other DTCs that were output together with DTC P0A7A-203.

RESULT

DTC No.	Relevant Diagnosis
P0A7A-122, 130, 322, 324, 325, 517, 518, 809, 810, 811	Generator Inverter Performance

NOTE:

NEXT → See step 16

GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to DIAGNOSTIC TROUBLE CODE CHART [08/2013 - ]