DTC P0A1A-200: Generator Control Module; DTC P0A1A-792: Generator Control Module; DTC P0A1A-793: Generator Control Module: Procedure

CHECK DTC OUTPUT (HV)

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.

Check if DTCs are output.

Result

DTC No.	Relevant Diagnosis
P0A4B-253, P0A4C-513, P0A4D-255	Generator resolver circuit

YES → GO TO DIAGNOSTIC TROUBLE CODE CHART

NO: Go to next step

CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)
1. Check the connection of the low voltage connector of the inverter with converter assembly.
  
  Fig 1: Checking Connector Connection Condition (Inverter With Converter Assembly Connector)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Result
  
  The connector is connected securely and there are no contact problems.
NG → CONNECT SECURELY

OK: Go to next step

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

WARNING:

Be sure to wear insulated gloves.

Turn the power switch off and remove the service plug grip.
NOTE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair service information because this may cause a malfunction.
Disconnect connector A60 from the inverter with converter assembly.

Fig 2: Identifying A60 Inverter With Converter Assembly Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Turn the power switch on (IG).

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

Standard voltage

Tester Connection	Specified Condition
GRF (A60-1) - Body ground	Below 1 V
GRFG (A60-12) - Body ground	Below 1 V
GSN (A60-14) - Body ground	Below 1 V
GSNG (A60-3) - Body ground	Below 1 V
GCS (A60-13) - Body ground	Below 1 V
GCSG (A60-2) - Body ground	Below 1 V

NOTE:

Turning the power switch on (IG) with the low voltage connector of the inverter with converter assembly disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK GENERATOR RESOLVER

Turn the power switch off.

Fig 3: Identifying A60 Inverter With Converter Assembly Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard resistance (Check for open)

Tester Connection	Specified Condition
GRF (A60-1) - GRFG (A60-12)	4.2 to 12.5 Ω
GSN (A60-14) - GSNG (A60-3)	9.8 to 20.1 Ω
GCS (A60-13) - GCSG (A60-2)	9.8 to 20.1 Ω

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

Standard resistance (Check for short)

Tester Connection	Specified Condition
GRF (A60-1) or GRFG (A60-12) - Body ground	10 kΩ or more
GSN (A60-14) or GSNG (A60-3) - Body ground	10 kΩ or more
GCS (A60-13) or GCSG (A60-2) - Body ground	10 kΩ or more
GRF (A60-1) - GSN (A60-14)	10 kΩ or more
GRF (A60-1) - GSNG (A60-3)	10 kΩ or more
GRF (A60-1) - GCS (A60-13)	10 kΩ or more
GRF (A60-1) - GCSG (A60-2)	10 kΩ or more
GRFG (A60-12) - GSN (A60-14)	10 kΩ or more
GRFG (A60-12) - GSNG (A60-3)	10 kΩ or more
GRFG (A60-12) - GCS (A60-13)	10 kΩ or more
GRFG (A60-12) - GCSG (A60-2)	10 kΩ or more
GSN (A60-14) - GCS (A60-13)	10 kΩ or more
GSN (A60-14) - GCSG (A60-2)	10 kΩ or more
GSNG (A60-3) - GCS (A60-13)	10 kΩ or more
GSNG (A60-3) - GCSG (A60-2)	10 kΩ or more

OK → REPLACE INVERTER WITH CONVERTER ASSEMBLY

NG: Go to next step

CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR)
1. Check the connection of the generator resolver connector.
  
  Fig 4: Locating Generator Resolver Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Result
  
  The connector is connected securely and there are no contact problems.
NG → CONNECT SECURELY

OK: Go to next step

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

Disconnect connector E87 from the generator resolver.

Fig 5: Identifying E87 Motor Resolver Connector And Inverter With Converter Assembly Connector Terminal A60
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard resistance (Check for open)

Tester Connection	Specified Condition
GRF (A60-1) - GRF (E87-1)	Below 1 Ω
GRFG (A60-12) - GRFG (E87-5)	Below 1 Ω
GSN (A60-14) - GSN (E87-2)	Below 1 Ω
GSNG (A60-3) - GSNG (E87-6)	Below 1 Ω
GCS (A60-13) - GCS (E87-3)	Below 1 Ω
GCSG (A60-2) - GCSG (E87-7)	Below 1 Ω

Standard resistance (Check for short)

Tester Connection	Specified Condition
GRF (A60-1) or GRF (E87-1) - Body ground	10 kΩ or more
GRFG (A60-12) or GRFG (E87-5) - Body ground	10 kΩ or more
GSN (A60-14) or GSN (E87-2) - Body ground	10 kΩ or more
GSNG (A60-3) or GSNG (E87-6) - Body ground	10 kΩ or more
GCS (A60-13) or GCS (E87-3) - Body ground	10 kΩ or more
GCSG (A60-2) or GCSG (E87-7) - Body ground	10 kΩ or more
GRF (A60-1) - GSN (A60-14)	10 kΩ or more
GRF (A60-1) - GSNG (A60-3)	10 kΩ or more
GRF (A60-1) - GCS (A60-13)	10 kΩ or more
GRF (A60-1) - GCSG (A60-2)	10 kΩ or more
GRFG (A60-12) - GSN (A60-14)	10 kΩ or more
GRFG (A60-12) - GSNG (A60-3)	10 kΩ or more
GRFG (A60-12) - GCS (A60-13)	10 kΩ or more
GRFG (A60-12) - GCSG (A60-2)	10 kΩ or more
GSN (A60-14) - GCS (A60-13)	10 kΩ or more
GSN (A60-14) - GCSG (A60-2)	10 kΩ or more
GSNG (A60-3) - GCS (A60-13)	10 kΩ or more
GSNG (A60-3) - GCSG (A60-2)	10 kΩ or more

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 → See step 7

REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY. Refer to COMPONENTS