Dtc B2281 P Signal Malfunction

Lexus IS250 IS220d GSE20 ALE20 4GR-FSE STARTING

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC OUTPUT (MULTIPLEX COMMUNICATION SYSTEM)

CHECK DTC OUTPUT (AUTOMATIC TRANSMISSION SYSTEM)

CHECK CONNECTORS

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

INSPECT SHIFT LOCK CONTROL ECU

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

READ VALUE OF INTELLIGENT TESTER

DTC B2281 "P" Signal Malfunction

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 ConditionTrouble Area
B2281 Cable and BEAN between the power source control ECU and the shift lock control ECU are inconsistent
Power source control ECU
Shift lock control ECU
ECM
Wire harness or connector

WIRING DIAGRAM

Dtc B2281 P Signal Malfunction. 4GR-FSE STARTING. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

1.CHECK DTC OUTPUT (MULTIPLEX COMMUNICATION SYSTEM)

Delete the DTC .

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)

Delete the DTCs .

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 .
NG
GO TO AUTOMATIC TRANSMISSION SYSTEM
OK
3.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
4.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BODY GROUND)
Dtc B2281 P Signal Malfunction. 4GR-FSE STARTING. Lexus IS250 IS220d GSE20 ALE20

Disconnect the 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
5.INSPECT SHIFT LOCK CONTROL ECU
Dtc B2281 P Signal Malfunction. 4GR-FSE STARTING. Lexus IS250 IS220d GSE20 ALE20

Disconnect the shift lock control ECU connector.

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

  • Standard resistance:
  • Tester Connection (Symbols)ConditionSpecified Condition
    J48-11 (P2) - J48-8 (E)Shift P positionBelow 1 Ω
    Shift non-P position10 kΩ or higher
NG
REPLACE SHIFT LOCK CONTROL ECU
OK
6.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - SHIFT LOCK CONTROL ECU)
Dtc B2281 P Signal Malfunction. 4GR-FSE STARTING. Lexus IS250 IS220d GSE20 ALE20

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

  • Standard resistance:
  • Tester Connection (Symbols)ConditionSpecified Condition
    J55-5 (P) - J48-11 (P2)AlwaysBelow 1 Ω
    J55-5 (P) or J48-11 (P2) - Body groundAlways10 kΩ or higher
    J48-8 (E) - Body groundAlwaysBelow 1 Ω
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
7.READ VALUE OF INTELLIGENT TESTER

Connect the intelligent tester to the DLC3.

Turn the engine switch on (IG).

Power Source Control:
ItemMeasurement Item/Display (Range)Normal ConditionDiagnostic Note
Shift P SigShift P position/ ON or OFFON: 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