Transmission Control ECU Communication Stop Mode: Procedure

1. Turn the power switch off.
2. Disconnect the transmission control ECU assembly connector.
   Fig 1: Identifying A22 Connector Terminals

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

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   A22-16 (CA1H) - A22-15 (CA1L)	Power switch off	54 to 69 Ω

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

NG → REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (TRANSMISSION CONTROL ECU ASSEMBLY) 

OK: Go to next step 

1. Disconnect the transmission control ECU assembly connectors.
   Fig 2: Identifying A22 And A21 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A22-1 (E1) - Body ground	Always	Below 1 Ω

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A21-16 (+B) - Body ground	Power switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

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

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

OK → See step   3