HINT:At the time of installation, please refer to the following item.Place a new gasket on the air intake chamber.Torque: 19.5 N·m (200 kgf·cm, 14 ft·lbf)
SF064–02S04582S04595ThrottleStop ScrewVacuumNo ClearanceThrottle LeverS04594VTAE2VCOhmmeterVacuumSF–34–SFITHROTTLE BODY885AuthorĂ:DateĂ:1997 LEXUS ES300 (RM511U)INSPECTION1.CLEAN THROTTLE BODY(a)Using a soft brush and carburetor cleaner, clean the castparts.(b)Using compressed air, clean all the passages and aper-tures.NOTICE:To prevent deterioration, do not clean the throttle positionsensor and IAC valve.2.INSPECT THROTTLE VALVE(a)Apply vacuum to the throttle opener.(b)Check that there is no clearance between the throttle stopscrew and throttle lever when the throttle valve is fullyclosed.3.INSPECT THROTTLE POSITION SENSOR(a)Apply vacuum to the throttle opener.(b)Using an ohmmeter, measure the resistance betweeneach terminal.Throttle valve conditionBetween terminalsResistanceFully closedVTA – E20.2 – 5.7 kΩFully openVTA – E22.0 – 10.2 kΩ–VC – E22.5 – 5.9 kΩ
SF065–01–SFITHROTTLE BODYSF–35886AuthorĂ:DateĂ:1997 LEXUS ES300 (RM511U)INSTALLATIONInstallation is in the reverse order of removal (See page SF–33).
S04529DLC1E1TE1DLC1SSTS04533RSC+BRSOOhmmeterSF066–01S04529E1DLC1TE1DLC1SSTSF–36–SFIIDLE AIR CONTROL (IAC) VALVE887AuthorĂ:DateĂ:1997 LEXUS ES300 (RM511U)IDLE AIR CONTROL (IAC) VALVEON–VEHICLE INSPECTION1.INSPECT IAC VALVE OPERATION(a)Initial conditions:zEngine at normal operating temperaturezIdle speed checked correctlyzTransmission in neutral positionzA/C switch OFF(b)Using SST, connect terminals TE1 and E1 of the DLC1.SST09843–18020(c)After engine speed is kept at approx. 1,000 rpm for 5 se-conds, check that it returns to idle speed.If the engine speed operation is not as specified, check the IACvalve, wiring and ECM.(d)Remove the SST from the DLC1.SST09843–180202.INSPECT IAC VALVE RESISTANCENOTICE:”Cold” and ”Hot” in the following sentences express thetemperature of the coils themselves. ”Cold” is from –10°C(14°F) to 50°C (122°F) and ”Hot” is from 50°C (122°F) to100°C (212°F).(a)Disconnect the IAC valve connector.(b)Using an ohmmeter, measure the resistance between ter-minal +B and other terminals (RSC, RSO).Resistance:Cold: 17.0 – 24.5 ΩHot: 21.5 – 28.5 ΩIf resistance is not as specified, replace the IAC valve.(c)Reconnect the IAC valve connector.3.INSPECT AIR ASSIST SYSTEM(a)Initial conditions:zEngine at normal operating temperaturezIdle speed checked correctlyzTransmission in neutral positionzA/C switch OFF(b)Using SST, connect terminals TE1 and E1 of the DLC1.SST09843–18020(c)After engine speed is kept at 900 – 1,300 rpm for 10 se-conds, check that it returns to idle speed.
S05510PlugDisconnectPlug–SFIIDLE AIR CONTROL (IAC) VALVESF–37888AuthorĂ:DateĂ:1997 LEXUS ES300 (RM511U)(d)Stop the engine.(e)Disconnect the air assist hose from the air pipe, and blockoff the IAC valve exit and the entry to the pipe.
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Lexus, Fuel injection, SFI, LEXUS ES300, Throttle position sensor