ECM Communication Stop Mode [06/2018 - 08/2021]: Procedure

1. Disconnect the cable from the negative (-) auxiliary battery terminal.
2. Disconnect the A26 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A26-7 (CAN+) - A26-17 (CAN-)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω
   A26-8 (CANH) - A26-18 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

   Result

   Result	Proceed to
   OK	A
   NG (No. 2 junction connector main line)	B
   NG (No. 2 CAN junction connector branch line)	C

Result: 

B 

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (ECM) 

Result: 

C 

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (ECM) 

Result: 

A 

See step  2

1. Check the ECM power source circuit.

   Refer to ECM Power Source Circuit [06/2018 - ]

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE ECM. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)