2003 Lexus GS 430 User Guide - Page 231

IF YOUR ENGINE STALLS WHILE DRIVING If your engine stalls while driving ...1. Reduce your speed gradually, keeping a straight line. Move cautiously off the road to a safe place. 2. Turn on your emergency flashers. 3. Try starting the engine again. If the engine will not start, see "If your vehicle will not start". IF YOUR VEHICLE WILL NOT START (a) Simple checks Before making these checks, make sure you have followed the correct starting procedure instructions in "How to start the engine" on page 180 and that you have sufficient fuel. Since your vehicle is equipped with the engine immobiliser system, also check whether the other keys will start the engine. If they work, your immobiliser key may be broken. Have the key checked at your Lexus dealer. If none of your keys work, there may be a malfunction in the immobiliser system. Call your Lexus dealer. See "Keys" on page 8. If the engine is not turning over or is turning over too slowly - 1. Check that the battery terminals are tight and clean. 2. If the battery terminals are O.K., switch on the interior light. 3. If the light is out, dim or goes out when the starter is cranked, the battery is discharged. You may try jump starting. See "(c) Jump starting" for further instruction. If the light is O.K., but the engine still will not start, it needs adjustment or repair. Call a Lexus dealer, Roadside Assistance or Customer Service Assistance. (See "Foreword".) CAUTION If the engine is not running, the power assist for the brakes and steering will not work, so steering and braking will be much harder than usual.