System Description

ENGINE IMMOBILISER SYSTEM DESCRIPTION
1. The engine immobiliser system determines whether or not to enable starting of the hybrid control system based on a comparison of the key ID code and the vehicle pre-registered code. The engine immobiliser system compares the vehicle certification ECU (smart key ECU assembly) pre-registered ID code with the key-embedded transponder chip ID code. If the ID codes do not match, the engine immobiliser system activates and the hybrid control system cannot be started. The certification ECU (smart key ECU assembly) manages communication with the hybrid control system, power management control ECU, transmission control ECU assembly and ID code box (immobiliser code ECU). When the ID codes of the transponder chip and certification ECU (smart key ECU assembly) match, the certification ECU (smart key ECU assembly) authorizes the starting of the hybrid control system.

START FUNCTION PROBLEM SYMPTOMS

Symptom	Suspected Area	Component Malfunction	Possible Output DTC	Related Data List Item
Hybrid control system cannot be started*1	Certification ECU (smart key ECU assembly)	Open or short circuit inside ECU	B278A B2790	Ignition Switch #Codes Immobilizer when IG=ON Immobiliser Master Key Sub Key BCC Malfunction Abnormal Status Different Encrypt Code Different Serial Number Frame Error Response Wireless Starter Com ID Wireless C Code Engine Start Condition ID-BOX Sleep Condition ID-BOX Start Condition Engine Start Request 3bit Code Request S Code Check L Code Check Unlock Request Receive Lock Request Receive S Code Check (Past) L Code Check (Past) EFI Code Receive EFI communication R Code Check
Hybrid control system cannot be started*1	ID code box (immobiliser code ECU)	Open or short circuit inside ECU	B2790 B2799 B279A	Immobilizer when IG=ON Immobiliser Master Key Sub Key BCC Malfunction Abnormal Status Different Encrypt Code Different Serial Number Frame Error Response ID-BOX Sleep Condition ID-BOX Start Condition Engine Start Request 3bit Code Request S Code Check L Code Check S Code Check (Past) L Code Check (Past) EFI Code Receive EFI communication R Code Check
	Power management control ECU	Open or short circuit inside ECU	B2799 B279A B279C	EFI Code Receive
	Hybrid control system	Power management control ECU incompatible with engine immobiliser system installed	B279C	Engine Start Condition EFI Code Receive
Power source mode cannot be changed*1	Power switch	Open or short circuit inside switch	B278A	Ignition Switch Unlock Request Receive Lock Request Receive
Power source mode cannot be changed*1	Power management control ECU	Open or short circuit inside ECU	B2271 B2274	Ignition Switch Immobilizer when IG=ON Immobiliser

*1: Refer to Problem Symptoms Table for Smart Access System with Push-button Start (for Start Function).