DTC B2274: ACC Monitor Malfunction: Procedure

1. Connect Techstream to the DLC3.
2. Turn the engine switch on (IG) and press Techstream main switch on.
3. Read the Data List according to the displays on the tester.
   POWER SOURCE CONTROL:
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   ACC Relay Monitor	Status of ACC Relay Monitor / ON or OFF	ON: Engine switch ON (ACC) OFF: Engine switch OFF	-

   OK

   "ON" (engine switch on (ACC)) appears on the screen.

   Result

   Condition	Proceed to
   NG	C
   OK (When troubleshooting according to the PROBLEM SYMPTOM TABLE)	B
   OK (When troubleshooting according to the DTC chart)	A

B → PROCEED TO  PROBLEM SYMPTOMS TABLE  NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

C → See step   2 

A → REPLACE POWER SOURCE CONTROL ECU 

1. Remove the ACC relay for the instrument panel J/B.
   Fig 1: Identifying ACC Relay From Instrument Panel J/B

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

   Resistance

   Tester Connection	Specified Condition
   3 - 5	10 kΩ or higher
   3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

NG → REPLACE RELAY 

OK: Go to next step 

1. Disconnect the D44 ECU connector.
   Fig 2: Identifying D44 ECU Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.
   Fig 3: Identifying ACC Relay Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Resistance

   Terminal No. (Symbol)	Specified Condition
   J/B ACC relay terminal 2 - D44-11 (ACCD)	Below 1 Ω
   J/B ACC relay terminal 2 - Body ground	10 kΩ or higher
   J/B ACC relay terminal 1 - Body ground	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE POWER SOURCE CONTROL ECU