Dtc B2799 Engine Immobiliser System Malfunction

Vehicle Interior. Yaris. Ncp93, 131
Theft Deterrent Keyless Entry. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM)

DTC B2799 Engine Immobiliser System Malfunction


DESCRIPTION

This DTC is output when: 1) the ECM detects errors in its own communication with the transponder key ECU; 2) the ECM detects errors in the communication lines; and 3) the ECU - ECM communication IDs between the transponder key ECU and the ECM are different and an engine start is attempted.
Before troubleshooting for this DTC, make sure no transponder key ECU DTCs are present. If present, troubleshoot the transponder key ECU DTCs first.

DTC No.
DTC Detection Condition
Trouble Area
B2799
  1. Error in communication between ECM and transponder key ECU, or in communication line
  2. Communication ID in transponder key ECU is different
  1. Wire harness
  2. ECM

WIRING DIAGRAM


Yaris. Ncp93, 131.Theft Deterrent Keyless Entry.Engine Immobiliser System (For Sedan). Dtc B2799 Engine Immobiliser System Malfunction


INSPECTION PROCEDURE

1.CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - ECM)


    Yaris. Ncp93, 131.Theft Deterrent Keyless Entry.Engine Immobiliser System (For Sedan). Dtc B2799 Engine Immobiliser System Malfunction

  1. Disconnect the D23 transponder key ECU connector.

  1. Disconnect the A21 ECM connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    D23-13 (EFIO) - A21-11 (IMI)
    		Below 1 Ω
    D23-12 (EFII) - A21-10 (IMO)
    		Below 1 Ω
    D23-13 (EFIO) or A21-11 (IMI) -
    Body ground
    		10 kΩ or higher
    D23-12 (EFII) or A21-10 (IMO) -
    Body ground
    		10 kΩ or higher

  1. Reconnect the D23 transponder key ECU connector.

  1. Reconnect the A21 ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (YARIS_NCP93 RM000001CN002AX.html)