DTC B2799-86: Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid [11/2018 - 08/2020]: Description

w/o Occupant Classification System:

If there is a communication malfunction between the ECM and ID code box (immobiliser code ECU), or when the communication ID codes do not match, the ECM stores this DTC.

w/ Occupant Classification System:

If there is a communication malfunction between the ECM and certification ECU (smart key ECU assembly), or when the communication ID codes do not match, the ECM stores this DTC.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
B2799-86	Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid	Either of the following conditions is met (1 trip detection logic*): w/o Occupant Classification System: A malfunction is detected in the communication or communication lines between the ECM and ID code box (immobiliser code ECU). The communication ID codes of the ECM and ID code box (immobiliser code ECU) do not match. w/ Occupant Classification System: A malfunction is detected in the communication or communication lines between the ECM and certification ECU (smart key ECU assembly). The communication ID codes of the ECM and certification ECU (smart key ECU assembly) do not match.	w/o Occupant Classification System ID code box (immobiliser code ECU) ECM Harness or connector w/ Occupant Classification System Certification ECU (smart key ECU assembly) ECM Harness or connector	DTC output confirmation operation (Perform either of the following): Start the engine and wait for 10 seconds. If there is a malfunction, the engine will stop (communication begins within 3 seconds of the engine start, and DTCs are stored after 6 seconds). Connect the cable to the negative (-) battery terminal, start the engine and wait for 10 seconds (communication begins within 3 seconds of the engine switch being turned on (IG), and DTCs are stored after 6 seconds).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

B2799-86

Engine Immobiliser System Signal (Some Circuit Quantity, Reported via Serial Data) Invalid

Either of the following conditions is met (1 trip detection logic*):
w/o Occupant Classification System:

A malfunction is detected in the communication or communication lines between the ECM and ID code box (immobiliser code ECU).
The communication ID codes of the ECM and ID code box (immobiliser code ECU) do not match.

w/ Occupant Classification System:

A malfunction is detected in the communication or communication lines between the ECM and certification ECU (smart key ECU assembly).
The communication ID codes of the ECM and certification ECU (smart key ECU assembly) do not match.

w/o Occupant Classification System

w/ Occupant Classification System

DTC output confirmation operation (Perform either of the following):

Start the engine and wait for 10 seconds. If there is a malfunction, the engine will stop (communication begins within 3 seconds of the engine start, and DTCs are stored after 6 seconds).
Connect the cable to the negative (-) battery terminal, start the engine and wait for 10 seconds (communication begins within 3 seconds of the engine switch being turned on (IG), and DTCs are stored after 6 seconds).

VEHICLE CONDITION AND FAIL-SAFE OPERATION WHEN MALFUNCTION DETECTED

Vehicle Condition when Malfunction Detected	Fail-safe Operation when Malfunction Detected
Engine cannot be started	-

RELATED DATA LIST AND ACTIVE TEST

DTC No.	Data List and Active Test
B2799-86	-