ENGINE IMMOBILISER SYSTEM DIAGNOSIS SYSTEM

  1. DESCRIPTION

    1. The certification ECU (smart key ECU assembly) and power management control ECU 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.

  2. CHECK DLC3

    1. Check the DLC3 Click here.

  3. INSPECT AUXILIARY BATTERY VOLTAGE

    1. Measure the auxiliary battery voltage with the power switch off.

      If the voltage is below 11 V, recharge or replace the auxiliary battery.

    2. START FUNCTION PROBLEM SYMPTOMS

      3. Symptom Suspected Area Component Malfunction Possible Output DTCs Related Data List Item
      Hybrid control system cannot be started*1 Certification ECU (smart key ECU assembly) Open or short circuit inside ECU

      • B278A

      • 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

      • L Code Check

      • Unlock Request Receive

      • Lock Request Receive

      • L Code Check (Past)

      • EFI Code Receive

      • EFI communication
      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 installed engine immobiliser system 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
      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