DTC B2274: ACC Monitor Malfunction: Procedure

1. Use the Data List to check if the ACC relay is functioning properly.
   MAIN BODY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   ACC Relay Monitor	ACC relay monitor/ON or OFF	ON: Engine switch on (ACC) OFF: Engine switch off	-

   OK

   When the engine switch is turned on (IG), ON is displayed on the Techstream.

NG → See step   3 

OK: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. Turn the engine switch on (IG), wait at least 10 seconds, and check whether DTC B2274 is output.
   RESULT
   
   

   Result	Proceed to
   No DTC output	A
   DTC B2274 output	B

B → REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH) 

A → See step   4 

Fig 1: Identifying Main Body ECU Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the E1, 2A and 2D main body ECU connectors.
2. Measure the voltage and resistance according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   2A-1 - Body ground	Always	11 to 14 V

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E1-22 (ACCD) - 2D-45	Always	Below 1 Ω
   2D-62 (GND2) - Body ground	Always	Below 1 Ω
   E1-22 (ACCD) or 2D-45 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)