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Es300, GS430, GX470, LS430, Lx470, RX300 & SC430

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2003 Lexus SC 430, 2003 Lexus RX 300, 2003 Lexus LX 470, 2003 Lexus LS 430, and 2003 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Ignition coil may also be referred to as ignition coil/ignitor.
  1. Remove ignition coils. On all vehicles except GX470, see IGNITION SYSTEM in REMOVAL & INSTALLATION - EXCEPT GX470 article. On GX470, see IGNITION SYSTEM in REMOVAL & INSTALLATION - GX470 article.
  2. Reinstall electrical connectors on ignition coils. Remove spark plugs. Install spark plug on each ignition coil. Ground spark plugs against cylinder block. Disconnect electrical connectors at fuel injectors.
    3. CAUTION: DO NOT crank engine for longer than 5 seconds when checking for spark.
  3. Crank engine and check for spark. If spark does not exist, check electrical connection at ignition coil. If electrical connection is okay, go to next step. If electrical connection is defective, repair as necessary and recheck for spark.
  4. Install different ignition coil on spark plug and recheck for spark. If spark still does not exist, go to next step. If spark now exists with different ignition coil, replace original ignition coil.
  5. Turn ignition on. Using voltmeter, check for battery voltage at ignition coil positive terminal. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If battery voltage exists, go to next step. If battery voltage does not exist, check wiring between ignition switch and ignition coil.
    6. NOTE: On ES300 and RX300, 2 camshaft position sensors are used and may also be referred to as Variable Valve Timing (VVT) sensors. Both camshaft position sensors should be checked when checking camshaft position sensor resistance.
  6. On all models, check resistance of camshaft position sensor(s). See CAMSHAFT POSITION SENSOR RESISTANCE . If camshaft position sensor resistance is within specification, go to next step. If camshaft position sensor resistance is not within specification, replace camshaft position sensor. On all vehicles except GX470, see IGNITION SYSTEM in REMOVAL & INSTALLATION - EXCEPT GX470 article. On GX470, see IGNITION SYSTEM in REMOVAL & INSTALLATION - GX470 article.
  7. Check resistance of crankshaft position sensor. See CRANKSHAFT POSITION SENSOR RESISTANCE . If crankshaft position sensor resistance is within specification, go to next step. If crankshaft position sensor resistance is not within specification, replace crankshaft position sensor. On all vehicles except GX470, see IGNITION SYSTEM in REMOVAL & INSTALLATION - EXCEPT GX470 article. On GX470, see IGNITION SYSTEM in REMOVAL & INSTALLATION - GX470 article.
  8. Check ignition IGT signal from Engine Control Module (ECM) to ignition coil. If ignition IGT signal from ECM is defective, Diagnostic Trouble Code (DTC) P0351, P0352, P0353, P0354, P0355, P0356, P0357 or P0358 should set in ECM memory to indicate a specified ignitor circuit malfunction. See SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article for retrieving of DTCs.
  9. If ignition IGT signal is okay, substitute another ignition coil and recheck system operation. If ignition IGT signal is defective, check wiring between ECM and ignition coil. See ECM LOCATION  table. If wiring is defective, repair wiring as necessary and recheck system operation. If wiring is okay, substitute another ECM and recheck system operation. Reinstall components. Install and tighten spark plugs to 13 ft. lbs. (18 N.m).
    ECM LOCATION

    Model (1) Location
    ES300, GX470, LX470 & RX300 Behind Glove Box
    GS300, IS300, GS430, LS430 & SC430 Driver's Side Front Corner Of Engine Compartment
    (1) For illustration of ECM location, see THEORY & OPERATION article.
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