Lexus IS250 · Service Manual ENGINE

B2281

Diagnostic trouble codes

DESCRIPTION

The power source control ECU and the shift lock control ECU are connected by a cable and the BEAN. If the cable information and BEAN information are inconsistent, this DTC will be output.

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
B2281
 Cable and BEAN between the power source control ECU and the shift lock control ECU are inconsistent
  1. Power source control ECU
  2. Shift lock control ECU
  3. ECM
  4. Wire harness or connector

WIRING DIAGRAM

B112582E01

INSPECTION PROCEDURE


1. CHECK DTC OUTPUT (MULTIPLEX COMMUNICATION SYSTEM)

  1. Delete the DTC (Click here).

  1. Check for the multiplex network communication system DTCs B1210, B1214 and B1215.

    HINT:
    If the DTCs for the multiplex network communication system malfunction are output, inspect those DTCs first.

    OK:
    No DTC is output.



 NG
GO TO MULTIPLEX COMMUNICATION SYSTEM
OK


2. CHECK DTC OUTPUT (AUTOMATIC TRANSMISSION SYSTEM)

  1. Delete the DTCs (Click here).

  1. Check for the automatic transmission system DTC P0705.

    OK:
    DTC P0705 is not output.

    HINT:
    If DTC P0705 is output, perform troubleshooting for DTC P0705 first (Click here).



 NG
GO TO AUTOMATIC TRANSMISSION SYSTEM
OK


3. 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


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

  1. B128304E23
    Disconnect the 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


5. INSPECT SHIFT LOCK CONTROL ECU

  1. A113064E01
    Disconnect the shift lock control ECU connector.

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

    Standard resistance:
    Tester Connection (Symbols)
    		 Condition
    		 Specified Condition
    J48-11 (P2) - J48-8 (E)
    		 Shift P position
    		 Below 1 Ω
    Shift non-P position
    		 10 kΩ or higher



NG
REPLACE SHIFT LOCK CONTROL ECU
OK


6. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - SHIFT LOCK CONTROL ECU)

  1. A109255E07
    Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection (Symbols)
    		 Condition
    		 Specified Condition
    J55-5 (P) - J48-11 (P2)
    		 Always
    		 Below 1 Ω
    J55-5 (P) or J48-11 (P2) - Body ground
    		 Always
    		 10 kΩ or higher
    J48-8 (E) - Body ground
    		 Always
    		 Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7. READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG).

    Power source control ECU: 
    Item
    		 Measurement Item/Display (Range)
    		 Normal Condition
    		 Diagnostic Note
    Shift P Sig
    		 Shift P position/ ON or OFF
    		 ON: Shift P position
    OFF: Shift non-P position
    		 -

    OK:
    ON (shift P position) and OFF (shift non-P position) appear on the screen.



 NG
REPLACE POWER SOURCE CONTROL ECU
OK

REPLACE ECM


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