Es300 & RX300

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 Lexus SC 430, 2002 Lexus RX 300, 2002 Lexus LX 470, 2002 Lexus LS 430, and 2002 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.

Distributorless Ignition System (DIS) uses Engine Control Module (ECM) for determining ignition timing (spark advance). ECM may determine ignition timing (spark advance) based on various input signals, engine RPM and knock sensor input signals.

Two Variable Valve Timing (VVT) sensors and a crankshaft position sensor deliver input signals to ECM. VVT sensors may also be referred to as camshaft position sensors. ECM detects standard crankshaft position based on VVT sensor input signals and actual crankshaft position, and engine speed by crankshaft position sensor input signals. One VVT sensor is mounted in outer corner of each cylinder head, just below valve cover (oil filler cap end). Crankshaft position sensor is located at front of crankshaft, near crankshaft pulley. For knock sensor location, see REMOVAL, OVERHAUL & INSTALLATION article.

ECM uses 6 ignition primary control signals to ignitors for ignition coils. DIS uses 6 ignition coils with internal ignitors, one ignition coil for each cylinder. Cylinder No. 1 is front cylinder on right side of engine when viewed from flywheel end of engine. Cylinder No. 2 is front cylinder on left side of engine when viewed from flywheel end of engine. Cylinders No. 1, 3 and 5 are on right side of engine. Cylinders No. 2, 4 and 6 are on left side of engine.

ECM monitors IGF circuit at ignitor to ensure ignition coils have fired.