ELECTRICAL
EL016-03

October 24, 2003

Title:
IMMOBILIZER SYSTEM: VEHICLES EQUIPPED WITH TRANSPONDER ECU

Models:
'01 - '03 Prius & '03 4Runner, Camry, Land Cruiser & Sequoia

Introduction

On Toyota vehicles that are equipped with the Immobilizer system, the Immobilizer function is either incorporated in the ECM (SAE term: Powertrain Control Module/PCM) or in a separate Transponder ECU. This TSB clarifies Immobilizer related service procedures on vehicles equipped with a Transponder ECU.

Applicable Vehicles^ 2001 - 2003 model year Prius vehicles.
^ 2003 model year 4Runner, Land Cruiser, and Sequoia vehicles.
^ 2003 model year Camry vehicles equipped with 1MZ - FE engine and 5-speed Automatic Transmission.








Required SSTs

NOTE: Additional Diagnostic Tester Kits, Program Cards or other SSTs may be ordered by calling SPX/OTC at 1-800-933-8335.







Warranty Information

Operation Procedure

For vehicles equipped with the Transponder ECU, the Immobilizer disables the engine from starting (via fuel and spark delivery) utilizing an ignition key with an ID code. Transponder ECU systems communicate with a transponder chip embedded in the grip of the ignition key. This ID code is different for each key and must be registered in the vehicle Transponder ECU.







With the exception of Prius, Immobilizer keys designed for transponder type systems are identified by a dot ("o") mark on the key shank just below the key grip (see illustration).

NOTE: The part numbers for these transponder type keys are new; it is recommended that your parts department look up the correct Immobilizer keys for your particular application. Previous model year's Master and Sub keys are incompatible with the models listed in "Applicable Vehicles."







Immobilizer functions vary by model. Use the chart as an aid when identifying Immobilizer keys and functions.

Immobilizer Reset and Diagnostic Tester Support:

For most vehicles, the Diagnostic Tester incorporates support to add, delete or remove keys into the Immobilizer system. To perform the Immobilizer functions it is necessary to have the most current Diagnostic Tester software available. For more detailed Diagnostic Tester information, refer to TSB No. SS003-02, "Diagnostic Tester Immobilizer Functions."

ECU ID Communication:

When replacing the ECM (SAE term: PCM) or the Transponder ECU a "handshake" procedure must be performed. This ECU ID communication is necessary to enable the Transponder ECU and the ECM to recognize each other before the vehicle will start.

Complete ECU communication using the following steps:

1. Insert a Master key into the ignition cylinder.

2. Turn the ignition ON (engine OFF).

3. Short Tc and CG terminals of DLC3 using the Diagnostic Check Wire (SST 09843-18020 or equivalent) and leave for 30 minutes.

4. After 30 minutes, turn the ignition OFF and remove check wire from DLC3.

5. Register any additional keys as necessary.

6. Start the vehicle to confirm successful ECU communication.


Key Programming:







To program or delete a key, a registered Master key is necessary unless the Transponder ECU has been reset or replaced. The Transponder ECU system incorporates a black "Master" key and a gray "Sub" key. The process during registration of these two keys is identical. The key itself now determines if it functions as Master or Sub, not the registration procedure. The maximum number of allowable Master and Sub keys vary by model. Refer to the chart.

For additional details related to Immobilizer, refer to the vehicle specific Repair Manual on the Technical Information System (TIS) or TSB No. SS003-02, "Diagnostic Tester Immobilizer Functions."