Engine Control System: Other Lexus LS III рестайлинг

SYSTEM DIAGRAM

Engine control system is determined by the ECM based on signals from various sensors.

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1. INSPECTION THROTTLE BODY Inspect the throttle control motor for operating sound. Turn the ignition switch ON. When turning the accelerator pedal position sensor lever, check the running sound of the motor. The motor should be running smoothly without friction sounds. If operation is not as specified, check the throttle control motor wiring and ECM (see «DTC P2118 THROTTLE ACTUATOR CONTROL MOTOR CURRENT RANGE/PERFORMANCE»(ref-209347-S06910656532005120900000) ). Inspect the throttle position sensor. Connect the hand-held tester (with CAN VIM) to the DLC3. Turn the ignition switch ON. Check that the MIL does not light up. Check that, under the CURRENT DATA, THROTTLE POS (throttle valve opening percentage) is within the standard value below. Standard throttle valve opening percentage: 60% or more If operation is not as specified, check the throttle position sensor wiring and ECM (see «DTC P0120 THROTTLE/PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT, DTC P0122 THROTTLE/PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT LOW INPUT, DTC P0123 THROTTLE/PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT HIGH INPUT, DTC P0220 THROTTLE/PEDAL POSITION SENSOR/SWITCH "B" CIRCUIT, DTC P0222 THROTTLE/PEDAL POSITION SENSOR/SWITCH "B" CIRCUIT LOW INPUT, DTC P0223 THROTTLE/PEDAL POSITION SENSOR/SWITCH "B" CIRCUIT HIGH INPUT, DTC P2135 THROTTLE/PEDAL POSITION SENSOR/SWITCH "A"/"B" VOLTAGE CORRELATION»(ref-209347-S10639543492005120900000) ).
2. INSPECT ACCELERATOR PEDAL POSITION SENSOR When turning ignition switch ON, check that the voltage of the accelerator pedal position sensor of the CURRENT DATA is within the standard in value below. Standard voltage: 0.6 to 1.0 V If the result is not as specified, replace the accelerator pedal position sensor.
3. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY Connect the hand-held tester (with CAN VIM) to the DLC3. Turn the ignition switch ON. Start and warm up the engine. Connect the hand-held tester and select VVT from the ACTIVE TEST menu. Check the engine speed when the OCV is operated by the hand-held tester. OK

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1. INSPECT MASS AIR FLOW METER Check the output voltage. Apply battery voltage across terminals 1 (+B) and 2 (E2G). Using a voltmeter, connect the positive (+) tester probe to terminal VG, and negative (-) tester probe to terminal E2G. Blow air in to the MAF meter, and check that the voltage fluctuates. Measure the resistance between terminals 4 (THA) and 5 (E2). Standard: If the result is not as specified, replace the MAF meter.
2. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY Using an ohmmeter, measure the resistance between the terminals. Standard: 6.9 to 7.9 ohm at 20°C (68°F) Connect the battery's positive (+) lead to terminal 1 and negative (-) lead to terminal 2. Check the movement of the valve. If operation is not as specified, replace the valve.
3. INSPECT ACCELERATOR PEDAL ROD ASSY Measure the resistance between the terminals. Standard: If the result is not as specified, replace the pedal assy.
4. INSPECT THROTTLE BODY ASSY Measure the resistance between the terminals. Standard: If the result is not as specified, replace the throttle body assy.
5. INSPECT ENGINE COOLANT TEMPERATURE SENSOR Measure the resistance between terminals 1 and 2. Standard: If the result is not as specified, replace the sensor. NOTE: If checking the ECT sensor in the water, keep the terminals dry. After the check, wipe the sensor dry.
6. INSPECT KNOCK SENSOR Using an ohmmeter, measure the resistance between the terminals. Standard: 120 to 280 kohm at 20°C (68°F) If the result is not as specified, replace the sensor.
7. INSPECT RELAY (Marking: EFI, C/OPN) Remove the EFI and C/OPN relays from the engine room R/B. Measure the resistance of the relay. Standard: If the result is not as specified, replace the relay.
8. INSPECT RELAY (Marking: F/PMP) Remove the F/PMP relay from the engine room R/B. Measure the resistance of the F/PMP relay. Standard: If the result is not as specified, replace the relay.

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1. DRAIN ENGINE COOLANT (See «ENGINE COOLANT»(ref-209407-S06302099142005121000000) )
2. REMOVE V-BANK COVER Remove the 2 nuts and V-bank cover.
3. REMOVE AIR CLEANER INLET NO. 1
4. REMOVE INTAKE AIR CONNECTOR PIPE Disconnect the air hose and ventilation hose. Remove the bolt. Loosen the 2 hose clamps and remove the intake air connector pipe.
5. REMOVE THROTTLE BODY ASSY Disconnect the water by-pass hose and water by-pass hose No. 7. Disconnect the connector. Remove the 2 bolts, 2 nuts, throttle body and gasket.
6. INSTALL THROTTLE BODY ASSY Install a new gasket and the throttle body with the 2 bolts and 2 nuts. Torque: 18 N.m (185 kgf.cm, 13 ft.lbf) Connect the water by-pass hose and water by-pass hose No. 7. Connect the connector.
7. INSTALL INTAKE AIR CONNECTOR PIPE Install the intake air connector pipe with the bolt and 2 hose clamps. Torque: 4.0 N.m (41 kgf.cm, 35 in.lbf) for hose clamp 5.0 N.m (51 kgf.cm, 44 in.lbf) for bolt Connect the air hose and ventilation hose.
8. INSTALL AIR CLEANER INLET NO. 1
9. INSTALL V-BANK COVER Torque: 5.0 N.m (51 kgf.cm, 44 in.lbf)
10. REFILL ENGINE COOLANT (See «ENGINE COOLANT»(ref-209407-S06302099142005121000000) )
11. CHECK FOR ENGINE COOLANT LEAKS (See «INSPECTION»(ref-209405-S39390751782005121000000) )
12. INSPECT THROTTLE BODY FUNCTION (See «ON-VEHICLE INSPECTION»(ref-209387-S31853814132005121000000) )

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1. DRAIN ENGINE COOLANT (See «ENGINE COOLANT»(ref-209407-S06302099142005121000000) )
2. WORK FOR PREVENTING GASOLINE FROM SPILLING OUT (See «PRECAUTION»(ref-209388-S37154924142005121000000) )
3. REMOVE V-BANK COVER
4. REMOVE INTAKE AIR CONNECTOR PIPE
5. REMOVE THROTTLE BODY ASSY (See «REPLACEMENT»(ref-209387-S10503942502005121000000) )
6. REMOVE INTAKE MANIFOLD ASSY Disconnect the fuel pipe sub-assy No. 2 from the fuel main tube (See «PRECAUTION»(ref-209388-S37154924142005121000000) ). Disconnect the VSV connector for EVAP. Disconnect the EVAP hose from the VSV for EVAP. Remove the bolt, disconnect the VSV for EVAP from the upper intake manifold. Remove the bolt and V-bank cover bracket No. 2. Remove the bolt and V-bank cover bracket No. 3. Disconnect the VSV connector for IAC Valve. Remove the bolt and V-bank cover bracket No. 1. Remove the bolt and V-bank cover bracket No. 4. Remove the 4 bolts, and disconnect the engine wire protector (LH side) from upper intake manifold and camshaft bearing cap. Disconnect the 2 wire clamps on the engine wire (RH side) from the brackets on the RH delivery pipe. Remove the 2 bolts, and disconnect the engine wire protector (rear side) from the rear water by-pass joint and RH cylinder head. Disconnect the 8 injector connectors. Remove the 6 bolts, 4 nuts, the upper and lower intake manifolds assembly and 2 gaskets.
7. REMOVE KNOCK SENSOR Disconnect the 2 knock sensor connectors. Remove the 2 nuts and 2 knock sensors.
8. INSTALL KNOCK SENSOR Install the 2 knock sensors with the 2 nuts, as shown in the illustration. Torque: 20 N.m (204 kgf.cm, 15 ft.lbf) Connect the 2 knock sensor connectors.
9. INSTALL INTAKE MANIFOLD ASSY Place 2 new gaskets on the cylinder heads with the white mark facing outward. NOTE: Be careful of the installation direction. Install the upper and lower intake manifolds assembly with the 6 bolts and 4 nuts. Torque: 18 N.m (185 kgf.cm, 13 ft.lbf) Connect the 8 injector connectors. Install the engine wire protector (rear side0 with the 2 bolts. Install the engine wire protector (LH side) with the 4 bolts. Install the 2 wire clamps on the engine wire (RH side) to the brackets on the RH delivery pipe. Install the V-bank cover bracket No. 4 with bolt. Torque: 7.5 N.m (76.5 kgf.cm, 66 in.lbf) Install the V-bank cover bracket No. 1 with bolt. Torque: 7.5 N.m (76.5 kgf.cm, 66 in.lbf) Connect the VSV connector for IAC Valve. Install the V-bank cover bracket No. 3 with bolt. Torque: 7.5 N.m (76.5 kgf.cm, 66 in.lbf) Install the V-bank cover bracket No. 2 with bolt. Torque: 7.5 N.m (76.5 kgf.cm, 66 in.lbf) Connect the VSV for EVAP to the intake manifold with the bolt. Torque: 7.5 N.m (76.5 kgf.cm, 66 in.lbf) Connect the EVAP hose to the VSV for EVAP. Connect the VSV connector for EVAP. Connect the fuel pipe sub-assy No. 2 to the fuel main tube (See «PRECAUTION»(ref-209388-S37154924142005121000000) ).
10. INSTALL THROTTLE BODY ASSY (See «REPLACEMENT»(ref-209387-S10503942502005121000000) )
11. INSTALL INTAKE AIR CONNECTOR PIPE
12. INSPECT FUEL PUMP OPERATION AND CHECK FOR FUEL LEAKS (See «ON-VEHICLE INSPECTION»(ref-209388-S39694231562005121000000) )
13. INSTALL V-BANK COVER Torque: 5.0 N.m (51 kgf.cm, 44 in.lbf)
14. REFILL ENGINE COOLANT (See «ENGINE COOLANT»(ref-209407-S06302099142005121000000) )
15. CHECK FOR ENGINE COOLANT LEAKS (See «INSPECTION»(ref-209405-S39390751782005121000000) )
16. POWER WINDOW CONTROL SYSTEM INITIALIZE (See «INITIALIZATION»(ref-209365-S34766117492005120900000) )
17. FRONT POWER SEAT CONTROL SYSTEM INITIALIZE (See «INITIALIZATION»(ref-209370-S24942442202005120900000) )

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