Engine Stop and Start ECU Communication Stop Mode [11/2018 - 12/2021]: Procedure

1. Disconnect the cable from the negative (-) battery terminal.
2. Disconnect the engine stop and start ECU connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Engine Stop and Start ECU)

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A32-13 (CANH) - A32-14 (CANL)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR 

Result: 

OK 

See step  2

1. Disconnect the engine stop and start ECU connectors.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Front view of wire harness connector (to Engine Stop and Start ECU)

   -

   -

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A33-2 (GND2) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω
   A33-8 (GND1) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω
   A34-6 (DGND) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

3. Reconnect the cable to the negative (-) battery terminal.
   NOTE:

   When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

   Refer to INITIALIZATION [11/2018 - 02/2019] , or refer to INITIALIZATION [02/2019 - 10/2019] , or refer to INITIALIZATION [10/2019 - 06/2020] , or refer to INITIALIZATION [06/2020 - 08/2020] , or refer to INITIALIZATION [08/2020 - 12/2021]

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A34-1 (+B) - Body ground	Always	9.5 to 14 V
   A33-1 (BIN2) - Body ground	Always	9.5 to 14 V
   A33-3 (BIN1) - Body ground	Always	9.5 to 14 V
   A32-21 (IG1) - Body ground	Ignition switch ON	9.5 to 14 V
   	Ignition switch off	Below 1 V
   A32-18 (IG2) - Body ground	Ignition switch ON	9.5 to 14 V
   	Ignition switch off	Below 1 V
   A32-19 (ACC) - Body ground	Ignition switch ACC	9.5 to 14 V
   	Ignition switch off	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ENGINE STOP AND START ECU 

Refer to REMOVAL [11/2018 - 10/2019] , or refer to REMOVAL [10/2019 - 08/2020] , or refer to REMOVAL [08/2020 - 10/2022]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)