LX470 — NEW FEATURES 19 Model System Outline ’06 Model ’05 Model Air Conditioning Cut-off Control By turning the A/C compressor ON or OFF in accordance with the engine condition, drivability is maintained. Engine Immobilizer Prohibits fuel delivery and ignition if an attempt is made to start the engine with an invalid ignition key. Diagnosis [See page 54] When the ECM detects a malfunction, the ECM diagnoses and memorizes the failed section. Fail-safe When the ECM detects a malfunction, the ECM stops or controls the engine according to the data already stored in the memory.