Dtc B2791 Communication Condition Failure Between Ecm

Securities. Lexus Gs430, Gs300. Uzs190 Grs190
Engine Immobiliser. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC

DTC B2791 Communication Condition Failure between ECM


DESCRIPTION

This DTC is output when the immobiliser code ECU does not respond to a verification request signal from the ECM.
HINT:
  1. If the engine switch is turned off immediately after an engine start, this DTC is also detected.
  2. If this DTC is detected, check if any DTCs such as B2799 are output.

DTC No.
DTC Detection Condition
Trouble Area
B2791
Immobiliser code ECU does not respond to verification request signal from ECM
  1. Wire harness
  2. Immobiliser code ECU
  3. ECM

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Engine Immobiliser.Engine Immobiliser System. Dtc B2791 Communication Condition Failure Between Ecm


INSPECTION PROCEDURE

1.CHECK FOR DTC

  1. Delete the DTC (Click here).

  1. Recheck for DTC.

    Result:
    Tester Connection
    		Specified Condition
    B2791 and other DTC output
    		A
    No DTC output
    		B


B
END
A

Go to DTC CHART (CHECK DTC OTHER THAN B2791)