2UZ-FE ENGINE Engine Control System General The engine control system of the 2UZ-FE engine on the 06 has following systems. System SFI Sequential Multiport Fuel Injection ESA Electronic Spark Advance ETCS-i Electronic Throttle Control System-intelligent VVT-i Variable Valve Timing-intelligent Acoustic Control Induction System Air Injection Fuel Pump Control Air Fuel Ratio Sensor and Oxygen Sensor Heater Control Evaporative Emission Control Outline An L-type SFI system directly detects the intake air mass with a hot wire type mass air flow meter. 06 Model 05 Ignition timing is determined by the based on the signals from various sensors. The corrects ignition timing in response to engine knocking. Optimally controls the throttle valve opening in accordance with the amount of accelerator pedal effort and the conditions of the engine and vehicle. An accelerator pedal position sensor is provided on the accelerator pedal A non-contact type throttle position sensor is used. Controls the intake camshafts to ensure optimal valve timing in accordance with the engine condition. The intake air passages are switched according to the engine speed and throttle valve opening angle to provide high performance in all speed ranges. The 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. The fuel pump speed is controlled by the signal from the. The fuel pump is stopped when the SRS airbag is deployed in front, side or rear side collision. 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. The controls the purge flow of evaporative emission (HC) in the canister in accordance with engine conditions. Approximately five hours after the ignition switch has been turned off, the operates the canister pump module to detect any evaporative emission leakage occurring in the evaporative emission control system through changes in the reference orifice pressure. (Continued)
136 System Outline 06 Air Conditioning Cut-off Control* 1 Starter Control Cranking Hold Function Engine Immobilizer* 2 Diagnosis Fail-safe * 1 : for Models with Air Conditioning System * 2 : Canada Models Only By turning the air conditioning compressor on or off in accordance with the engine condition, drivability is maintained. Once the ignition switch is turned to the START position, this control continues to operate the starter until the engine starts. Prohibits fuel delivery and ignition if an attempt is made to start the engine with an invalid ignition key. When the detects a malfunction, the diagnoses and memorizes the failed section. When the detects a malfunction, the stops or controls the engine according to the data already stored in the memory. Model 05
13 Construction The configuration of the engine control system in the 2UZ-FE engine is shown in the following chart. S ACTUATOR MASS AIR FLOW METER INTAKE AIR TEMPERATURE CRANKSHAFT POSITION CAMSHAFT POSITION VG THA NE G2 #10 #20 #30 #40 #50 #60 #0 #80 SFI NO. 1 INJECTOR NO. 2 INJECTOR NO. 3 INJECTOR NO. 4 INJECTOR NO. 5 INJECTOR NO. 6 INJECTOR NO. INJECTOR NO. 8 INJECTOR ENGINE COOLANT TEMPERATURE ACCELERATOR PEDAL POSITION THW VPA VPA2 IGT 1, 4, 6, IGF1 IGT 2, 3, 5, 8 IGF2 ESA IGNITION COIL with IGNITER No. 1, 4, 6, IGNITION COIL with IGNITER No. 2, 3, 5, 8 THROTTLE POSITION VTA1 VTA2 SPARK PLUGS SPARK PLUGS KNOCK S KNK1 KNK2 No. 2, 3, 5, 8 No. 1, 4, 6, VVT S VV1 VV2 M ETCS-i THROTTLE CONTROL MOTOR STOP LIGHT SWITCH STP VVT-i CENTER DIFF. LOCK DETECTION SWITCH* 1 L4 OC1 CAMSHAFT TIMING OIL CONTROL VALVE (Bank 1) 4WD SWITCH* 1 4WD OC2 CAMSHAFT TIMING OIL CONTROL VALVE (Bank 2) COMBINATION METER Vehicle Speed Signal SPD VSV * 1 : 4WD Models (Continued) 25TU42
138 AIR PRESSURE AIRBAG ASSEMBLY IGNITION SWITCH AIP F/PS STSW AIV1 AIV2 AIRP AIRV AIDI AIR INJECTION VSVs AIR INJECTION CONTROL DRIVER Start Signal Ignition Signal IGSW AIR INJECTION CONTROL VALVE (for Electric Type) PARK/NEUTRAL POSITION SWITCH Neutral Start Signal Shift Lever Position Signal NSW R, D, 3, 2 FC ELECTRIC AIR PUMP FUEL PUMP CONTROL CIRCUIT OPENING RELAY SHIFT L SWITCH LMS FPR FUEL PUMP RELAY TAILLIGHT RELAY ELS1 STAR/ NSW STARTER CONTROL PARK / NEUTRAL POSITION SWITCH DEFOGGER RELAY ELS2 STA STARTER RELAY O/D CUT SWITCH AIR FUEL RATIO (Bank 1, Sensor 1) (Bank 2, Sensor 1) ODMS A1A+ A2A+ HA1A HA2A HT1B HT2B A/F & OXYGEN HEATER CONTROL A/F (Bank 1, Sensor 1) (Bank 2, Sensor 1) HEATED OXYGEN (Bank 1, Sensor 2) (Bank 2, Sensor 2) HEATED OXYGEN (Bank 1, Sensor 2) (Bank 2, Sensor 2) PUMP MODULE PRESSURE OX1B OX2B PPMP MPMP VPMP PRG EVAPORATIVE EMISSION CONTROL CANISTER PUMP MODULE LEAK DETECTION PUMP VENT VALVE PURGE VSV 25TU43 (Continued)
139 AIR CONDITIONING AMPLIFIER Air Conditioning Switch Signal AC1 ACT ACCR ACC CUT RELAY DLC3 CANL, CANH TC IMI IMO TRANSPONDER KEY ECU* 2 +B, +B2 EFI MAIN RELAY MREL SPD TACH COMBINATION METER BATTERY BATT W MIL : CAN * 2 : Canada Models Only 001TU02Y