2003 LEXUS LS430 Factory Repair Manual

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Page 4329 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 3: Ignition System Diagram (2 Of 2) Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. ON-VEHICLE INSPECTION 1.INSPECT IGNITION COIL ASSY (WITH IGNITER) AND PERFORM SPARK TEST a. Check for DTCs. b

Page 4330 of 4500

LEXUS LS430 2003 Factory Repair Manual 6. Visually check if spark occurs while the engine is being cranked. If a spark does not occur, perform the test as follows: Fig. 4: Spark Test Flow Diagram Courtesy of TOYOTA MOTOR SALES, U.S.A.,

Page 4331 of 4500

LEXUS LS430 2003 Factory Repair Manual INSPECTION 1.INSPECT SPARK PLUG a. Check the electrode. 1. Using an megaohmmeter, measure the insulation resistance. Correct insulation resistance: 10 Mohms or higher Fig. 5: Checking Electrode

Page 4332 of 4500

LEXUS LS430 2003 Factory Repair Manual If the resistance is less than the specified value, proceed to step (d). HINT: If the megaohmmeter is not available, perform the following simple inspection instead. b. Alternative inspection method

Page 4333 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 6: Alternative Inspection Method Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. c. Check the spark plug for any damage on its thread and insulator. If there is any damage, replace the spark plug

Page 4334 of 4500

LEXUS LS430 2003 Factory Repair Manual d. Check the spark plug electrode gap. Maximum electrode gap for used spark plug: 1.3 mm (0.051 in.) If the gap is greater than the maximum, replace the spark plug. Correct electrode gap for new s

Page 4335 of 4500

LEXUS LS430 2003 Factory Repair Manual If the electrode his traces of wet carbon, clean the electrode with a spark plug cleaner and then dry it. Fig. 8: Cleaning Spark Plugs Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. Air pressure: 5

Page 4336 of 4500

LEXUS LS430 2003 Factory Repair Manual HINT: Only use the spark plug cleaner when the electrode is free of oil. If the electrode has traces of oil, use gasoline to clean off the oil before using the spark plug cleaner. 2.INSPECT CAMSHAF
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