Dtc B2276 Accr Signal Circuit Malfunction

Engine. Lexus Is250, Is220D. Gse20 Ale20
2Ad-Fhv Starting. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CONNECTORS

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

CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - ECM)

INSPECT ECM

INSPECT POWER SOURCE CONTROL ECU

DTC B2276 ACCR Signal Circuit Malfunction


DESCRIPTION

This DTC is output when the ACCR output circuits inside the power source control ECU are open or short.
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
B2276
ACCR output circuit inside power source control ECU or other related circuit is malfunctioning
  1. Power source control ECU
  2. ECM
  3. Wire harness or connector

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Starting.Starting System. Dtc B2276 Accr Signal Circuit Malfunction


INSPECTION PROCEDURE

1.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


2.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BODY GROUND)


    Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Starting.Starting System. Dtc B2276 Accr Signal Circuit Malfunction

  1. Disconnect the J55 ECU connector.

  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


3.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - ECM)


    Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Starting.Starting System. Dtc B2276 Accr Signal Circuit Malfunction

  1. Disconnect the A49 ECM connector.

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

    Standard resistance:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    J55-31 (CTSW) - A49-24 (ACCR)
    		Always
    		Below 1 Ω
    J55-31 (CTSW) or A49-24 (ACCR) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.INSPECT ECM


    Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Starting.Starting System. Dtc B2276 Accr Signal Circuit Malfunction

  1. Reconnect the A49 ECM connector.

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

    Standard voltage:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    J55-31 (CTSW) - Body ground
    		Always
    		8 to 14 V


NG
REPLACE ECM
OK


5.INSPECT POWER SOURCE CONTROL ECU


    Lexus Is250, Is220D. Gse20 Ale20.2Ad-Fhv Starting.Starting System. Dtc B2276 Accr Signal Circuit Malfunction

  1. Reconnect the J55 ECU connector.

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

    Standard voltage:
    Terminal No. (Symbol)
    		Condition
    		Specified condition
    J55-31 (CTSW) - Body ground
    		Clutch pedal depressed, Engine switch on (ST) → on (IG)
    		0.1 to 0.8 V (*1) →
    Output voltage at terminal AM2 is -2 V or more.
    HINT:
    *1: Voltage is output only when the engine is cranking.


NG
REPLACE POWER SOURCE CONTROL ECU
OK

CHECK INTERMITTENT PROBLEMS