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Toyota engine ECU and immobox replacement: matching with an OBDII jumper (30 minutes)

Toyota/Lexus Interface Classic Coding / Adaptations Advanced ⏱ 30-60 min 7 steps

Procedure for matching a new or used engine ECU to the vehicle and for replacing the immobox. It is needed when parts of the immobiliser system are changed and the two units have to be resynchronised with each other.

Required licences

  • —

Hardware / cables

  • AVDI
  • cavo OBDII
⚠ WarningReplacing immobiliser parts requires a working key, which has to be confirmed through the immo module live data if it cannot be verified any other way (for example by starting the car). The OBDII pins to be jumpered must be checked on the specific vehicle.

Procedure

  1. ENGINE ECU REPLACEMENT - Fit the new or used ECU of the required type to the vehicle and turn the ignition ON.
  2. Jumper the specified OBDII pins, checking them against the model of car you are working on.
  3. Wait 30 minutes: at the end of it the instrument cluster goes into full light mode and starts flashing intensely.
  4. Once the 30 minutes have passed and you have seen the flashing, remove the jumper you fitted at the start, turn the ignition OFF, wait a minute or two and start the engine.
  5. IMMOBOX REPLACEMENT - This procedure does not need a working key and does not need the immobox's own key: a replacement immobox, new or used, is enough.
  6. Fit the new immobox to the vehicle and run the ALL KEYS LOST procedure for that model.
  7. Then run the engine ECU replacement procedure described above, to match the immobox to the engine ECU.

Reference screenshots

Toyota engine ECU and immobox replacement: matching with an OBDII jumper (30 minutes) — 1
Source: Manuale Toyota/Lexus/Scion, cap. 5 - IMMOBILIZER modules replacement (p.25) · ⏱ estimated time 30-60 min
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