ECM Communication Stop Mode [01/2019 - 04/2020]: Procedure

1. Disconnect the cable from the negative (-) auxiliary battery terminal.
2. Disconnect the A46 and C77 ECM connectors.
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
   A46-13 (CANH) - A46-26 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω
   C77-31 (CAN+) - C77-32 (CAN-)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

   Result

   Result	Proceed to
   OK	A
   NG (No. 2 CAN junction connector main line)	B
   NG (No. 5 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 [01/2019 - 09/2022]

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE ECM 

Refer to REMOVAL [01/2019 - 04/2020]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)