Dtc B2276 Accr Signal Circuit Malfunction

Lexus IS250 IS220d GSE20 ALE20 2AD-FHV STARTING

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 ConditionTrouble Area
B2276 ACCR output circuit inside power source control ECU or other related circuit is malfunctioning
Power source control ECU
ECM
Wire harness or connector

WIRING DIAGRAM

Dtc B2276 Accr Signal Circuit Malfunction. 2AD-FHV STARTING. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

1.CHECK CONNECTORS

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)
Dtc B2276 Accr Signal Circuit Malfunction. 2AD-FHV STARTING. Lexus IS250 IS220d GSE20 ALE20

Disconnect the J55 ECU connector.

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

  • Standard resistance:
  • Tester Connection (Symbols)ConditionSpecified Condition
    J55-6 (GND2) - Body groundAlwaysBelow 1 Ω
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
3.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - ECM)
Dtc B2276 Accr Signal Circuit Malfunction. 2AD-FHV STARTING. Lexus IS250 IS220d GSE20 ALE20

Disconnect the A49 ECM connector.

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

  • Standard resistance:
  • Tester Connection (Symbols)ConditionSpecified Condition
    J55-31 (CTSW) - A49-24 (ACCR)AlwaysBelow 1 Ω
    J55-31 (CTSW) or A49-24 (ACCR) - Body groundAlways10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
4.INSPECT ECM
Dtc B2276 Accr Signal Circuit Malfunction. 2AD-FHV STARTING. Lexus IS250 IS220d GSE20 ALE20

Reconnect the A49 ECM connector.

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

  • Standard voltage:
  • Tester Connection (Symbols)ConditionSpecified Condition
    J55-31 (CTSW) - Body groundAlways8 to 14 V
NG
REPLACE ECM
OK
5.INSPECT POWER SOURCE CONTROL ECU
Dtc B2276 Accr Signal Circuit Malfunction. 2AD-FHV STARTING. Lexus IS250 IS220d GSE20 ALE20

Reconnect the J55 ECU connector.

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

  • Standard voltage:
  • Terminal No. (Symbol)ConditionSpecified condition
    J55-31 (CTSW) - Body groundClutch 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