DTC P0A1B-168: Drive Motor "A" Control Module; DTC P0A1B-795: Drive Motor "A" Control Module; DTC P0A1B-796: Drive Motor "A" Control Module: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Enter the following menus: Powertrain / EV / Trouble Codes.
4. Check if DTCs related to the EV control system are output.

   Result

   Result	Proceed to
   Only P0A1B-168, 795 or 796 is output, or DTCs other than the ones in the table below are also output.	A
   Any of the following DTCs are also output.	B

   DTC No.	Relevant Diagnosis
   P0A3F-243	Drive Motor "A" Position Sensor Circuit
   P0A40-500	Drive Motor "A" Position Sensor Circuit Range/Performance
   P0A41-245	Drive Motor "A" Position Sensor Circuit Low

5. Turn the power switch off.

B → See step   8 

A: Go to next step 

NG → CONNECT SECURELY 

OK: Go to next step 

1. 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 repair information because this may cause a malfunction.

2. Disconnect the inverter with converter assembly connector.
3. Connect the cable to the negative (-) auxiliary battery terminal.
4. Turn the power switch on (IG).
5. Measure the voltage according to the value(s) in the table below.
   Fig 1: Measuring Voltage Of Inverter With Converter Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   B3-1 (MRF) - Body ground	Power switch on (IG)	Below 1 V
   B3-2 (MRFG) - Body ground	Power switch on (IG)	Below 1 V
   B3-3 (MSN) - Body ground	Power switch on (IG)	Below 1 V
   B3-4 (MSNG) - Body ground	Power switch on (IG)	Below 1 V
   B3-6 (MCS) - Body ground	Power switch on (IG)	Below 1 V
   B3-5 (MCSG) - Body ground	Power switch on (IG)	Below 1 V

   TEXT IN ILLUSTRATION
   
   

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

   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.

6. Turn the power switch off.
7. Disconnect the cable from the negative (-) auxiliary battery terminal.
8. Reconnect the inverter with converter assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. 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 repair information because this may cause a malfunction.

2. Disconnect the inverter with converter assembly connector.
3. Measure the resistance according to the value(s) in the table below.
   Fig 2: Measuring Voltage Of Inverter With Converter Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance (Check for Open)

   Tester Connection	Switch Condition	Specified Condition
   B3-1 (MRF) - B3-2 (MRFG)	Power switch off	4.5 to 16.8 Ω
   B3-3 (MSN) - B3-4 (MSNG)	Power switch off	9.3 to 30.7 Ω
   B3-6 (MCS) - B3-5 (MCSG)	Power switch off	9.3 to 30.7 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Switch Condition	Specified Condition
   B3-1 (MRF) or B3-2 (MRFG) - Body ground and other terminals	Power switch off	10 kΩ or higher
   B3-3 (MSN) or B3-4 (MSNG) - Body ground and other terminals	Power switch off	10 kΩ or higher
   B3-6 (MCS) or B3-5 (MCSG) - Body ground and other terminals	Power switch off	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

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

4. Reconnect the inverter with converter assembly connector.

NG → See step   6 

OK: Go to next step 

1. Check the connection of the motor resolver connector.

   OK

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

   Fig 3: Identifying Motor Resolver Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG → CONNECT SECURELY 

OK → See step   9 

1. Check the connection of the motor resolver connector.

   OK

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

   Fig 4: Identifying Motor Resolver Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG → CONNECT SECURELY 

OK: Go to next step 

1. 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 repair information because this may cause a malfunction.

2. Disconnect the inverter with converter assembly connector.
3. Disconnect the motor resolver connector.
   Fig 5: Measuring Resistance Of Inverter With Converter Assembly - Motor Resolver Harness & Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Switch Condition	Specified Condition
   B6-1 (MRF) - B3-1 (MRF)	Power switch off	Below 1 Ω
   B6-5 (MRFG) - B3-2 (MRFG)	Power switch off	Below 1 Ω
   B6-2 (MSN) - B3-3 (MSN)	Power switch off	Below 1 Ω
   B6-6 (MSNG) - B3-4 (MSNG)	Power switch off	Below 1 Ω
   B6-3 (MCS) - B3-6 (MCS)	Power switch off	Below 1 Ω
   B6-7 (MCSG) - B3-5 (MCSG)	Power switch off	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Switch Condition	Specified Condition
   B6-1 (MRF) or B3-1 (MRF) - Body ground and other terminals	Power switch off	10 kΩ or higher
   B6-5 (MRFG) or B3-2 (MRFG) - Body ground and other terminals	Power switch off	10 kΩ or higher
   B6-2 (MSN) or B3-3 (MSN) - Body ground and other terminals	Power switch off	10 kΩ or higher
   B6-6 (MSNG) or B3-4 (MSNG) - Body ground and other terminals	Power switch off	10 kΩ or higher
   B6-3 (MCS) or B3-6 (MCS) - Body ground and other terminals	Power switch off	10 kΩ or higher
   B6-7 (MCSG) or B3-5 (MCSG) - Body ground and other terminals	Power 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 EV transaxle with motor assembly.

5. Reconnect the motor resolver connector.
6. Reconnect the inverter with converter assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   10