LX470 — NEW FEATURES 18 8. Engine Control System General The engine control system of the 2UZ-FE engine on the ’06 LX470 has the following system. (Continued) Model System Outline ’06 Model ’05 Model SFI Sequential Multiport Fuel Injection An L-type SFI system directly detects the intake air mass with a hot wire type mass air flow meter. ESA Electronic Spark Advance Ignition timing is determined by the ECM based on signals from various sensors. The ECM corrects ignition timing in response to engine knocking.
ETCS-i Electronic Throttle Control System-intelligent Optimally controls the throttle valve opening in accordance with the amount of accelerator pedal effort and the condition of the engine and the vehicle. VVT-i Variable Valve Timing-intelligent [See page 31] Controls the intake camshaft to optimal valve timing in accordance with the engine condition. — ACIS Acoustic Control Induction System [See page 35] The intake air passages are switched according to the engine speed and throttle valve opening angle to provided high performance in all speed ranges.
— Air Injection [See page 37] The ECM controls the air injection time based on the signals from the crankshaft position sensor, engine coolant temp. sensor, mass air flow meter and air pressure sensor. — Fuel Pump Control • The fuel pump speed is controlled by signal from the ECM. • The fuel pump is stopped, when the SRS airbag is deployed in front, side or rear side collision. Starter Control (Cranking Hold Function) Once the ignition switch is turned to the START position, this control continues to operate the starter until the engine started.
Oxygen Sensor Heater Control Maintains the temperature of the oxygen sensor at an appropriate level to increase accuracy of detection of the oxygen concentration in the exhaust gas. — Air Fuel Ratio Sensor and Oxygen Sensor Heater Control Maintains the temperature of the air fuel ratio sensor or oxygen sensor at an appropriate level to increase accuracy of detection of the oxygen concentration in the exhaust gas. — Evaporative Emission Control [See page 42] The ECM controls the purge flow of evaporative emission (HC) in the charcoal canister in accordance with engine conditions.
Using two VSVs and a vapor pressure sensor, the ECM detects any evaporative emission leakage occurring between the fuel tank and the charcoal canister through the changes in the tank pressure. — Approximately five hours after the ignition switch has been turned OFF, the ECM operates the leak detection pump to detect any evaporative emission leakage occurring between the fuel tank and the charcoal canister through changes in the fuel tank pressure. —