Transmission Control ECU Communication Stop Mode: Procedure

1. Turn the power switch off.
2. Disconnect the transmission control ECU connector.
   Fig 1: Identifying Transmission Control ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Front view of wire harness connector (to Transmission Control ECU)

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

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   A24-16 (CA1H) - A24-15 (CA1L)	Power switch off	54 to 69 Ω

NG → REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (ECM MAIN WIRE) 

OK: Go to next step 

1. Measure the voltage according to the value(s) in the table below.
   Fig 2: Identifying Transmission Control ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A23-16 (+B) - Body ground	Power switch on (IG)	11 to 14 V

   Callouts For Fig. 80
   
   

   *1	Front view of wire harness connector (to Transmission Control ECU)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

OK: Go to next step 

1. Disconnect the transmission control ECU connector.
   Fig 3: Identifying Transmission Control ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Front view of wire harness connector (to Transmission Control ECU)

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A24-1 (E1) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT) 

OK → See step   4