DTC B2274: ACC Monitor Malfunction [08/2015 - 08/2019]: 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 2A and 2D driver side junction block assembly connectors.

   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
   2A-48 - 2D-4	20°C (68°F)	50.63 to 123.75 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Driver Side Junction Block Assembly)

Result: 

NG 

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) 

Result: 

OK 

See step  4

1. Disconnect the 2A and 2D driver side junction block assembly connectors.
2. Disconnect the G39 power management control ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G39-19 (ACCD) - 2A-48	Always	Below 1 Ω
   2D-4 - Body ground	Always	Below 1 Ω
   G39-19 (ACCD) - Body ground	Always	10 kΩ or higher

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Connect the power management control ECU connectors.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *a

   Component with harness connected (Power Management Control ECU)

   -

   -

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   G39-19 (ACCD) - Body ground	Engine switch off	1 V or less
   	Engine switch on (ACC)	8.5 V or higher

Result: 

OK 

SYSTEM RETURNED TO NORMAL (DTC STORED DUE TO BAD CONNECTION, BUT SYSTEM RETURNED TO NORMAL BY RECONNECTING CONNECTOR) 

Result: 

NG 

REPLACE POWER MANAGEMENT CONTROL ECU 

(Refer to REMOVAL [08/2015 - 08/2019] )