DTC B2274: ACC Monitor Malfunction [09/2015 - ]: Procedure

See step  1

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE 

Result: 

OK 

See step  2

See step  2

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Disconnect the E151 certification ECU (smart key ECU assembly) connector.
2. Disconnect the 2J cowl side junction block LH connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E151-9 (ACCD) - 2J-18	Always	Below 1 Ω
   2J-1 - Body ground
   E151-9 (ACCD) or 2J-18 - Body ground		10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Remove the cowl side junction block LH. Refer to REMOVAL [09/2015 - ] .
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   * a

   Component without harness connected (Cowl Side Junction Block LH)

   -

   -

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2G-1 - 2I-51	Battery voltage not applied to terminals 2J-18 and 2J-1	10 kΩ or higher
   	Battery voltage applied to terminals 2J-18 and 2J-1	Below 1 Ω

Result: 

NG 

REPLACE COWL SIDE JUNCTION BLOCK LH 

Refer to REMOVAL [09/2015 - ] )

Result: 

OK 

See step  5

1. Reconnect the E151 certification ECU (smart key ECU assembly) connector.
2. Install the cowl side junction block LH. Refer to INSTALLATION [09/2015 - ] .
3. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   E151-9 (ACCD) - Body ground	Engine switch off → Engine switch on (ACC)	1 V or less → 8.5 V or higher

   TEXT IN ILLUSTRATION
   
   

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

Result: 

OK 

USE SIMULATION METHOD TO CHECK 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2015 - ] )

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) 

Refer to REMOVAL [09/2015 - ] )