Lexus IS250 · Service Manual ENGINE

B2276

Diagnostic trouble codes

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

B112581E01

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)

  1. B128304E23
    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 (GND) - Body ground
    		 Always
    		 Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

  1. A109242E14
    Disconnect the A5 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) - A5-11 (ACCR)
    		 Always
    		 Below 1 Ω
    J55-31 (CTSW) or A5-11 (ACCR) - Body ground
    		 Always
    		 10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4. INSPECT ECM

  1. B128304E26
    Reconnect the A5 ECM connector.

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

    Standard voltage:
    Tester Connection (Symbols)
    		 Condition
    		 Specified Condition
    J55-6 (GND) - Body ground
    		 Always
    		 8 to 14 V



NG
REPLACE ECM
OK


5. INSPECT POWER SOURCE CONTROL ECU

  1. B112480E02
    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
    		 Brake pedal depressed (A/T) or Clutch pedal depressed (M/T), Engine switch on (ST)
    		 0.1 to 0.8 V (*1)

    HINT:
    *1: Voltage is output only when the engine is cranking.



 NG
REPLACE POWER SOURCE CONTROL ECU
OK

CHECK INTERMITTENT PROBLEMS


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