IMMOBILISER SYSTEM(w/ Entry and Start System) DIAGNOSIS SYSTEM

  1. DESCRIPTION

    1. The certification ECU (smart key ECU assembly) and ECM control the vehicle immobiliser system functions. 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 immobiliser system even though the security indicator light is not illuminated.

      When the system seems to be malfunctioning, use the GTS to check for malfunctions and perform repairs.

  2. CHECK DLC3

    1. Check the DLC3.

      Click hereClick here

  3. 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.

  4. 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

    • B2790

    • B2799

    • B279A

    • 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

    Engine cannot be started*1

    ID code box (immobiliser code ECU)*3

    Certification ECU (smart key ECU assembly)*4

    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

    • Lock Request Receive

    • S Code Check (Past)

    • L Code Check (Past)

    • EFI Code Receive

    • EFI communication

    ECM

    Open or short circuit inside ECU

    • B2799

    • B279A

    • B279C

    EFI Code Receive

    SFI system*5

    ECD system*6

    ECM incompatible with installed immobiliser system

    B279C

    • Engine Start Condition

    • EFI 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

    Certification ECU (smart key ECU assembly)

    Open or short circuit inside ECU

    • B2271

    • B2274

    • Ignition Switch

    • Immobilizer 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 Entry and Start System (for Start Function).

    *2: Refer to Problem Symptoms Table for Steering Lock System.

    *3: w/ ID code box (Immobiliser Code ECU)

    *4: w/o ID code box (Immobiliser Code ECU)

    *5: for Gasoline

    *6: for Diesel