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Problem Symptoms Table

WARNING: This page is about a different car, the 2002 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
PROBLEM SYMPTOMS TABLE - ENGINE IMMOBILIZER SYSTEM

Symptom Suspect Area
Immobiliser is not set. (Engine starts with key codes other than the registered key code.)
  1. ECM
Engine does not start
  1. Key
  2. Wire harness
  3. Transponder key coil
  4. Amplifier
  5. ECM
Security indicator is always ON.
  1. Security indicator
  2. Wire harness
  3. ECM
Security indicator is always ON. (Although code has been registered in the automatic registration mode, indicator is not OFF.)
  1. Wire harness
  2. Transponder key coil
  3. Amplifier
  4. ECM
Security indicator is OFF. (When DTC of immobiliser Is output)
  1. Wire harness
  2. Transponder key coil
  3. Amplifier
  4. ECM
Security indicator is OFF. (When DTC of immobiliser is not output)
  1. Wire harness
  2. ECM
Security indicator is abnormally blinking.
  1. Wire harness
  2. ECM
*1: Check that the key which did not start the engine has been registered and that it is possible to start with other already registered key.
*2: Finish the automatic registration mode because the mode might still remain.