Dtc B2274 Acc Monitor Malfunction

Engine. Lexus Is250, Is220D. Gse20 Ale20
4Gr-Fse Starting. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT FUSE (AM2)

CHECK CONNECTORS

CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND)

CHECK COWL SIDE JUNCTION BLOCK RH (ACC RELAY, PWR OUTLET RELAY)

CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND)

INSPECT POWER SOURCE CONTROL ECU

RECHECK FOR DTC

REPLACE FAULTY J/B AND CHECK POWER SOURCE CONTROL ECU

REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR AND CHECK POWER SOURCE CONTROL ECU

DTC B2274 ACC Monitor Malfunction


DESCRIPTION

This DTC is output when there is a problem in the ACC output circuit, which is from the inside of the power source control ECU to the ACC or PWR POINT relay.
HINT:
When the power source control ECU is replaced with a new one and the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

DTC No.
DTC Detection Condition
Trouble Area
B2274
ACC relay actuation circuit inside power source control ECU or other related circuit is malfunctioning
  1. AM2 fuse
  2. Cowl side J/B RH
  3. Power source control ECU
  4. Wire harness or connector

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2274 Acc Monitor Malfunction


INSPECTION PROCEDURE

1.INSPECT FUSE (AM2)

  1. Remove the AM2 fuse from the cowl side J/B RH.

  1. Measure the resistance of the fuse.

    Standard resistance:
    Below 1 Ω


NG
REPLACE FUSE
OK


2.CHECK CONNECTORS

  1. Check that the connectors are securely connected and the terminals are not deformed or loose.

    OK:
    The connectors are securely connected and the terminals are not deformed or loose.


NG
REPAIR OR REPLACE CONNECTORS
OK


3.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND)


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2274 Acc Monitor Malfunction

  1. Disconnect the J55 ECU connector.

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

    Standard voltage:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    J55-33 (AM1) - Body ground
    		Always
    		10 to 14 V
    J55-12 (AM2) - Body ground
    		Always
    		10 to 14 V

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

    Standard resistance:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    J55-6 (GND2) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK COWL SIDE JUNCTION BLOCK RH (ACC RELAY, PWR OUTLET RELAY)


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2274 Acc Monitor Malfunction

  1. Disconnect the RD and RA J/B connectors.

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

    Standard resistance:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    RD-2 - RA-5 or RD-7
    		Always
    		68 to 250 Ω at 20°C (68°F)


NG
Go to step 8
OK


5.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND)


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2274 Acc Monitor Malfunction

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

    Standard resistance:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    J55-11 (ACCD) - RD-2
    		Always
    		Below 1 Ω
    J55-11 (ACCD) - Body ground
    		Always
    		10 kΩ or higher
    RA-5 - Body ground
    		Always
    		Below 1 Ω
    RD-7 - Body ground
    		Always
    		Below 1 Ω

  1. Connect each J/B connector with the power source control ECU connector disconnected.

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

    Standard voltage:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    J55-11 (ACCD) - Body ground
    		Engine switch on (IG)
    		Below 1 V


NG
Go to step 9
OK


6.INSPECT POWER SOURCE CONTROL ECU


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2274 Acc Monitor Malfunction

  1. Reconnect the J55 ECU connector.

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

    Standard voltage:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    J55-11 (ACCD) - Body ground
    		Engine switch off
    		Below 1 V
    Engine switch on (IG)
    		Output voltage at terminal AM2 is -2 V or more.


NG
REPLACE POWER SOURCE CONTROL ECU
OK


7.RECHECK FOR DTC

  1. Delete the DTCs (Click here).

  1. After DTCs are all cleared, turn the engine switch on (ACC). After 30 seconds have elapsed, check for DTCs again.

    OK:
    DTC B2274 is not output.


NG
REPLACE POWER SOURCE CONTROL ECU
OK

CHECK INTERMITTENT PROBLEMS

8.REPLACE FAULTY J/B AND CHECK POWER SOURCE CONTROL ECU


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2274 Acc Monitor Malfunction

  1. Replace a faulty J/B and then connect the power source control ECU connector.

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

    Standard voltage:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    J55-11 (ACCD) - Body ground
    		Engine switch off
    		Below 1 V
    Engine switch on (IG)
    		Output voltage at terminal AM2 is -2 V or more.


NG
REPLACE POWER SOURCE CONTROL ECU
OK

END

9.REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR AND CHECK POWER SOURCE CONTROL ECU


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Starting.Starting System. Dtc B2274 Acc Monitor Malfunction

  1. Repair or replace a faulty wire harness or connector and then connect the power source control ECU connector.

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

    Standard voltage:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    J55-11 (ACCD) - Body ground
    		Engine switch off
    		Below 1 V
    Engine switch on (IG)
    		Output voltage at terminal AM2 is -2 V or more.


NG
REPLACE POWER SOURCE CONTROL ECU
OK

END