2003 LEXUS LS430 Factory Repair Manual

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Page 4401 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 2: Identifying Intake Air Control System Diagram Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. ON-VEHICLE INSPECTION 1.INSPECT INTAKE AIR CONTROL FUNCTION

Page 4402 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 3: Inspecting Intake Air Control Function Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. a. Remove the V-bank cover. b. Connect the hand-held tester (with CAN VIM) to the DLC3. c. Perform the

Page 4403 of 4500

LEXUS LS430 2003 Factory Repair Manual b. Apply a vacuum of 39.9 kPa (300 mmHg, 11.8 in.Hg) to the actuator and check that the actuator rod moves. c. One minute after applying the vacuum, check that the rod's position is the same as

Page 4404 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 5: Inspecting Vacuum Tank Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 3.INSPECT VACUUM SWITCHING VALVE ASSY FOR IAC VALVE a. Measure the VSV resistance.

Page 4405 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 6: Measuring VSV Resistance Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. Standard:

Page 4406 of 4500

LEXUS LS430 2003 Factory Repair Manual VACUUM SWITCHING VALVE ASSY FOR IAC VALVE If the resistance is not as specified, replace the VSV assy. b. Check the VSV operation. 1. Check that air flows from port E to the filter. If the result i

Page 4407 of 4500

LEXUS LS430 2003 Factory Repair Manual If the result is not as specified, replace the VSV assy. Fig. 8: Checking Air Flows From Port E To Port F Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. REPLACEMENT 1.DRAIN ENGINE COOLANT 2.WORK F

Page 4408 of 4500

LEXUS LS430 2003 Factory Repair Manual 6.REMOVE THROTTLE BODY ASSY a. Disconnect the connector from the throttle body. b. Disconnect the PCV hose. c. Disconnect the 2 water by-pass hoses. HINT: It is not necessary to disconnect the
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