DTC B2274-11: ACC Circuit Short to Ground [11/2023 - ]: Procedure

Pre-procedure1

1. Disconnect the H138 certification ECU (smart key ECU assembly) connector.
2. Disconnect the 8B power distribution box assembly connector.

   Procedure1

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H138-21 (ACCD) - 8B-39	Always	Below 1 Ω
   8B-36 - Body ground	Always	Below 1 Ω
   H138-21 (ACCD) or 8B-39 - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

   Post-procedure1

4. Connect the H138 certification ECU (smart key ECU assembly) connector.
5. Connect the 8B power distribution box assembly connector.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  2

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Certification ECU (Smart Key ECU Assembly))

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   H138-21 (ACCD) - Body ground	Ignition switch off	1 V or less
   H138-21 (ACCD) - Body ground	Ignition switch ACC	8.5 V or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE POWER DISTRIBUTION BOX ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [11/2023 - ]