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

WARNING: This page is about a different variant/trim than selected.

CHECK DTC OUTPUT (HV)

Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

Check if DTCs are output.

Result

Result	Proceed to
P0A1A-200, 792, or 793 only is output.	A
Any of the following DTCs are also output.	B

DTC No.	Relevant Diagnosis
P0A3F-243	Drive Motor "A" Position Sensor Circuit
P0A45-669	Drive Motor "B" Position Sensor Circuit
P0A4B-253	Generator Position Sensor Circuit
P0A4C-513	Generator Position Sensor Circuit Range / Performance
P0A4D-255	Generator Position Sensor Circuit Low

Turn the ignition switch off.

B → See step 18

A: Go to next step

CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY)
WARNING:
Be sure to wear insulated gloves.
1. Check that the service plug grip is not installed.
  NOTE:
  After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair information because this may cause a malfunction.
  
  NOTE:
  Before disconnecting the connector, confirm that it is properly connected by checking that the locking claws are engaged and that the connector cannot be pulled out.
  
  Fig 1: Checking Connector Connection Condition (Inverter With Converter Assembly Connector)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the connection of the low voltage connector of the inverter with converter assembly.
  OK
  
  The connector is connected securely and there are no contact problems.
  
  HINT:
  
  When connecting the connector, insert it with the locking lever in the raised position. Rotate the lever downward and make sure that the connector is pulled into its socket. When the locking lever is in its fully closed position, a click will be heard as its locking claws engage. After the click is heard, pull up on the connector to confirm that it is properly connected.
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.

Disconnect the low voltage connector B58 from the inverter with converter assembly.
Turn the ignition switch to ON.

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

Fig 2: Checking Harness And Connector (Inverter With Converter Assembly - Generator Resolver)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
B58-1 (GRF) - Body ground	Ignition switch ON	Below 1 V
B58-7 (GRFG) - Body ground	Ignition switch ON	Below 1 V
B58-2 (GSN) - Body ground	Ignition switch ON	Below 1 V
B58-8 (GSNG) - Body ground	Ignition switch ON	Below 1 V
B58-3 (GCS) - Body ground	Ignition switch ON	Below 1 V
B58-9 (GCSG) - Body ground	Ignition switch ON	Below 1 V

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Inverter with Converter Assembly)

NOTE:

Turning the ignition switch to ON 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.

Turn the ignition switch off.
Connect the low voltage connector to the inverter with converter assembly.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK GENERATOR RESOLVER

Disconnect the low voltage connector B58 from the inverter with converter assembly.

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

Fig 3: Checking Harness And Connector (Inverter With Converter Assembly - Generator Resolver)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Resistance (Check for Open)

Tester Connection	Switch Condition	Specified Condition
B58-1 (GRF) - B58-7 (GRFG)	Ignition switch off	4.2 to 12.5 Ω
B58-2 (GSN) - B58-8 (GSNG)	Ignition switch off	9.8 to 20.1 Ω
B58-3 (GCS) - B58-9 (GCSG)	Ignition switch off	9.8 to 20.1 Ω

Standard Resistance (Check for Short)

Tester Connection	Switch Condition	Specified Condition
B58-1 (GRF) or B58-7 (GRFG) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
B58-2 (GSN) or B58-8 (GSNG) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
B58-3 (GCS) or B58-9 (GCSG) - Body ground and other terminals	Ignition switch off	10 kΩ or higher

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Inverter with Converter Assembly)

Connect the inverter with converter assembly connector.

NG → See step 12

OK: Go to next step

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

WARNING:

Be sure to wear insulated gloves.

Disconnect the low voltage connector B58 from the inverter with converter assembly.
Turn the ignition switch to ON.

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

Fig 4: Checking Harness And Connector (Inverter With Converter Assembly - Motor Resolver)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
B58-4 (MRF) - Body ground	Ignition switch ON	Below 1 V
B58-11 (MRFG) - Body ground	Ignition switch ON	Below 1 V
B58-5 (MSN) - Body ground	Ignition switch ON	Below 1 V
B58-12 (MSNG) - Body ground	Ignition switch ON	Below 1 V
B58-6 (MCS) - Body ground	Ignition switch ON	Below 1 V
B58-13 (MCSG) - Body ground	Ignition switch ON	Below 1 V

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Inverter with Converter Assembly)

NOTE:

Turning the ignition switch to ON 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.

Turn the ignition switch off.
Connect the inverter with converter assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK MOTOR RESOLVER

Disconnect the low voltage connector B58 from the inverter with converter assembly.

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

Fig 5: Checking Harness And Connector (Inverter With Converter Assembly - Motor Resolver)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Resistance (Check for Open)

Tester Connection	Switch Condition	Specified Condition
B58-4 (MRF) - B58-11 (MRFG)	Ignition switch off	4.2 to 12.5 Ω
B58-5 (MSN) - B58-12 (MSNG)	Ignition switch off	9.8 to 20.1 Ω
B58-6 (MCS) - B58-13 (MCSG)	Ignition switch off	9.8 to 20.1 Ω

Standard Resistance (Check for Short)

Tester Connection	Switch Condition	Specified Condition
B58-4 (MRF) or B58-11 (MRFG) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
B58-5 (MSN) or B58-12 (MSNG) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
B58-6 (MCS) or B58-13 (MCSG) - Body ground and other terminals	Ignition switch off	10 kΩ or higher

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Inverter with Converter Assembly)

Connect the inverter with converter assembly connector.

NG → See step 14

OK: Go to next step

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

WARNING:

Be sure to wear insulated gloves.

Disconnect the low voltage connector A64 from the inverter with converter assembly.
Turn the ignition switch to ON.

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

Fig 6: Checking Harness And Connector (Inverter With Converter Assembly - Rear Motor Resolver)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
A64-34 (RRF) - Body ground	Ignition switch ON	Below 1 V
A64-23 (RRFG) - Body ground	Ignition switch ON	Below 1 V
A64-33 (RSN) - Body ground	Ignition switch ON	Below 1 V
A64-22 (RSNG) - Body ground	Ignition switch ON	Below 1 V
A64-32 (RCS) - Body ground	Ignition switch ON	Below 1 V
A64-21 (RCSG) - Body ground	Ignition switch ON	Below 1 V

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Inverter with Converter Assembly)

NOTE:

Turning the ignition switch to ON 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.

Turn the ignition switch off.
Connect the inverter with converter assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK REAR MOTOR RESOLVER

Disconnect the low voltage connector A64 from the inverter with converter assembly.

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

Fig 7: Checking Harness And Connector (Inverter With Converter Assembly - Rear Motor Resolver)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard Resistance (Check for Open)

Tester Connection	Switch Condition	Specified Condition
A64-34 (RRF) - A64-23 (RRFG)	Ignition switch off	4.2 to 12.5 Ω
A64-33 (RSN) - A64-22 (RSNG)	Ignition switch off	9.8 to 20.1 Ω
A64-32 (RCS) - A64-21 (RCSG)	Ignition switch off	9.8 to 20.1 Ω

Standard Resistance (Check for Short)

Tester Connection	Switch Condition	Specified Condition
A64-34 (RRF) or A64-23 (RRFG) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
A64-33 (RSN) or A64-22 (RSNG) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
A64-32 (RCS) or A64-21 (RCSG) - Body ground and other terminals	Ignition switch off	10 kΩ or higher

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Inverter with Converter Assembly)

Connect the inverter with converter assembly connector.

NG → See step 16

OK: Go to next step

CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR)
1. Check the connection of the generator resolver connector.
  OK
  
  The connector is connected securely and there are no contact problems.
  
  Fig 8: Checking Connector Connection Condition (Generator Resolver Connector)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG → CONNECT SECURELY

OK: Go to next step
CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR)
1. Check the connection of the motor resolver connector.
  OK
  
  The connector is connected securely and there are no contact problems.
  
  Fig 9: Checking Connector Connection Condition (Motor Resolver Connector)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG → CONNECT SECURELY

OK: Go to next step
CHECK CONNECTOR CONNECTION CONDITION (REAR MOTOR RESOLVER CONNECTOR)
1. Check the connection of the rear motor resolver connector.
  OK
  
  The connector is connected securely and there are no contact problems.
  
  Fig 10: Checking Connector Connection Condition (Rear Motor Resolver Connector)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG → CONNECT SECURELY

OK → See step 19
CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR)
1. Check the connection of the generator resolver connector.
  OK
  
  The connector is connected securely and there are no contact problems.
  
  Fig 11: Checking Connector Connection Condition (Generator Resolver Connector)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG → CONNECT SECURELY

OK: Go to next step

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

Disconnect the low voltage connector B58 from the inverter with converter assembly.
Disconnect the generator resolver connector.

Fig 12: Checking Harness And Connector (Inverter With Converter Assembly - Generator Resolver)
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	Switch Condition	Specified Condition
B59-1 (GRF) - B58-1 (GRF)	Ignition switch off	Below 1 Ω
B59-6 (GRFG) - B58-7 (GRFG)	Ignition switch off	Below 1 Ω
B59-2 (GSN) - B58-2 (GSN)	Ignition switch off	Below 1 Ω
B59-7 (GSNG) - B58-8 (GSNG)	Ignition switch off	Below 1 Ω
B59-3 (GCS) - B58-3 (GCS)	Ignition switch off	Below 1 Ω
B59-8 (GCSG) - B58-9 (GCSG)	Ignition switch off	Below 1 Ω

Standard Resistance (Check for Short)

Tester Connection	Switch Condition	Specified Condition
B59-1 (GRF) or B58-1 (GRF) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
B59-6 (GRFG) or B58-7 (GRFG) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
B59-2 (GSN) or B58-2 (GSN) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
B59-7 (GSNG) or B58-8 (GSNG) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
B59-3 (GCS) or B58-3 (GCS) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
B59-8 (GCSG) or B58-9 (GCSG) - Body ground and other terminals	Ignition switch off	10 kΩ or higher

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Generator Resolver)
*b	Front view of wire harness connector (to Inverter with Converter Assembly)

HINT:

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

Connect the generator resolver connector.
Connect the inverter with converter assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 20

CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR)
1. Check the connection of the motor resolver connector.
  OK
  
  The connector is connected securely and there are no contact problems.
  
  Fig 13: Checking Connector Connection Condition (Motor Resolver Connector)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG → CONNECT SECURELY

OK: Go to next step

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

Disconnect the low voltage connector B58 from the inverter with converter assembly.
Disconnect the motor resolver connector.

Fig 14: Checking Harness And Connector (Inverter With Converter Assembly - Motor Resolver)
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	Switch Condition	Specified Condition
B60-1 (MRF) - B58-4 (MRF)	Ignition switch off	Below 1 Ω
B60-4 (MRFG) - B58-11 (MRFG)	Ignition switch off	Below 1 Ω
B60-2 (MSN) - B58-5 (MSN)	Ignition switch off	Below 1 Ω
B60-5 (MSNG) - B58-12 (MSNG)	Ignition switch off	Below 1 Ω
B60-3 (MCS) - B58-6 (MCS)	Ignition switch off	Below 1 Ω
B60-6 (MCSG) - B58-13 (MCSG)	Ignition switch off	Below 1 Ω

Standard Resistance (Check for Short)

Tester Connection	Switch Condition	Specified Condition
B60-1 (MRF) or B58-4 (MRF) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
B60-4 (MRFG) or B58-11 (MRFG) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
B60-2 (MSN) or B58-5 (MSN) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
B60-5 (MSNG) or B58-12 (MSNG) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
B60-3 (MCS) or B58-6 (MCS) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
B60-6 (MCSG) or B58-13 (MCSG) - Body ground and other terminals	Ignition switch off	10 kΩ or higher

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Motor Resolver)
*b	Front view of wire harness connector (to Inverter with Converter Assembly)

HINT:

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

Connect the motor resolver connector.
Connect the inverter with converter assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 20

CHECK CONNECTOR CONNECTION CONDITION (REAR MOTOR RESOLVER CONNECTOR)
1. Check the connection of the rear motor resolver connector.
  OK
  
  The connector is connected securely and there are no contact problems.
  
  Fig 15: Checking Connector Connection Condition (Rear Motor Resolver Connector)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG → CONNECT SECURELY

OK: Go to next step

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

Disconnect the low voltage connector A64 from the inverter with converter assembly.
Disconnect the rear motor resolver connector.

Fig 16: Checking Harness And Connector (Inverter With Converter Assembly - Rear Motor Resolver)
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	Switch Condition	Specified Condition
j7-1 (RRF) - A64-34 (RRF)	Ignition switch off	Below 1 Ω
j7-4 (RRFG) - A64-23 (RRFG)	Ignition switch off	Below 1 Ω
j7-2 (RSN) - A64-33 (RSN)	Ignition switch off	Below 1 Ω
j7-5 (RSNG) - A64-22 (RSNG)	Ignition switch off	Below 1 Ω
j7-3 (RCS) - A64-32 (RCS)	Ignition switch off	Below 1 Ω
j7-6 (RCSG) - A64-21 (RCSG)	Ignition switch off	Below 1 Ω

Standard Resistance (Check for Short)

Tester Connection	Switch Condition	Specified Condition
j7-1 (RRF) or A64-34 (RRF) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
j7-4 (RRFG) or A64-23 (RRFG) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
j7-2 (RSN) or A64-33 (RSN) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
j7-5 (RSNG) or A64-22 (RSNG) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
j7-3 (RCS) or A64-32 (RCS) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
j7-6 (RCSG) or A64-21 (RCSG) - Body ground and other terminals	Ignition switch off	10 kΩ or higher

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Rear Motor Resolver)
*b	Front view of wire harness connector (to Inverter with Converter Assembly)

HINT:

The rear motor resolver is not available separately. If it requires replacement, replace the rear traction motor with transaxle assembly.

Connect the rear motor resolver connector.
Connect the inverter with converter assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 21

GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART
REPLACE INVERTER WITH CONVERTER ASSEMBLY. Refer to REMOVAL
REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY. Refer to REMOVAL
REPLACE REAR TRACTION MOTOR WITH TRANSAXLE ASSEMBLY. Refer to REMOVAL