ECM Communication Stop Mode [09/2017 - 05/2019]: Procedure

1. Disconnect the cable from the negative (-) auxiliary battery terminal.
2. Disconnect the ECM connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to ECM)

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A35-13 (CANH) - A35-26 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR 

Result: 

OK 

See step  2

1. Disconnect the ECM connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Front view of wire harness connector (to ECM)

   -

   -

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C48-16 (E1) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω
   C48-49 (E02) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω
   C48-50 (E01) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω
   C48-58 (ME01) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω
   C48-53 (E04) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω

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

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

   Refer to INITIALIZATION [09/2017 - 05/2019]

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A35-1 (BATT) - Body ground	Power switch off	11 to 14 V
   A35-2 (+B) - Body ground	Auxiliary battery voltage applied to terminal A35-46 (MREL)	11 to 14 V
   A35-3 (+B2) - Body ground	Auxiliary battery voltage applied to terminal A35-46 (MREL)	11 to 14 V
   A35-37 (IGSW) - Body ground	Power switch on (IG)	11 to 14 V
   	Power switch off	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ECM. Refer to  REMOVAL [10/2014 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)