Diagnosis System [05/2013 - ]

DESCRIPTION
1. The certification ECU (smart key ECU assembly) and ECM control the vehicle engine immobiliser system functions. Engine immobiliser system data and Diagnostic Trouble Codes (DTCs) can be read through the vehicle Data Link Connector 3 (DLC3).
  In some cases, a malfunction may be occurring in the engine immobiliser system even though the security indicator light is not illuminated.
  
  When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform repairs.
CHECK DLC3
1. Check the DLC3. Refer to GENERAL INFORMATION [03/2012 - ] .
INSPECT BATTERY VOLTAGE
1. Measure the battery voltage.
  Standard voltage
  
  11 to 14 V
  
  If the voltage is below 11 V, recharge or replace the battery.

START FUNCTION PROBLEM SYMPTOMS

Symptom	Suspected Area	Component Malfunction	Possible Output DTCs	Related Data List Item
Engine cannot be started*1	Certification ECU (smart key ECU assembly)	Open or short circuit inside ECU	B278A B1571 B1572 B1577 B2275	Ignition Switch #Codes Immobiliser 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 ID-BOX Sleep Condition3 ID-BOX Start Condition3 Engine Start Request S Code Check3 L Code Check Unlock Request Receive Lock Request Receive S Code Check (Past)3 L Code Check (Past) EFI/EGI Code Receive EFI communication
Engine cannot be started*1	ID code box (immobiliser code ECU)*3	Open or short circuit inside ECU	B1571 B1572 B1577	Immobiliser 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 S Code Check L Code Check S Code Check (Past) L Code Check (Past) EFI/EGI Code Receive EFI communication
	ECM	Open or short circuit inside ECU	B1571 B1572 B1576	EFI/EGI Code Receive
	SFI system	ECM incompatible with installed engine immobiliser system	B1571 B1572	EFI/EGI Code Receive
Power source mode cannot be changed*1	Engine switch	Open or short circuit inside switch	B278A	Ignition Switch Unlock Request Receive Lock Request Receive
Power source mode cannot be changed*1	Certification ECU (smart key ECU assembly)	Open or short circuit inside ECU	B2271 B2274	Ignition Switch Immobiliser when IG=ON Immobiliser
Steering lock lock/unlock not possible*2	Steering lock ECU (steering lock actuator assembly)	Open or short circuit inside ECU Actuator stuck	B2781 B2782 B2788	Unlock Request Receive Lock Request Receive

*1: Refer to Problem Symptoms Table for Smart Key System (for Start Function).
*2: Refer to Problem Symptoms Table for Steering Lock System.
*3: w/ ID Code Box