1997 Lexus SC 400 Owners Manual - Page 174

IN CASE OF AN EMERGENCY 3. If the engine in the vehicle with the booster battery is not running, start it and let it run for about 5 minutes. During jump starting, run the engine at about 2000 rpm with the accelerator pedal lightly depressed. 4. Connect the jumper cables in the exact order shown in the illustration: positive terminal ("+" mark)-to-positive terminal ("+" mark), and negative terminal ("-" mark)- to-engine or body ground. Note that you first connect the positive cable to the discharged battery and then to the booster battery. Next, connect the negative cable to the booster battery and then to a solid, stationary, unpainted metallic point (e.g. SC400: water inlet housing filler plug, SC300: cylinder head) away from the battery. Do not connect it to or near any part that moves when the engine is cranked. 8. If removed, replace all the battery vent plugs. If the cause of your battery discharging is not apparent (for example, lights left on), you should have it checked. IF YOUR VEHICLE OVERHEATS If your engine coolant temperature gauge indicates overheating, if you experience a loss of power, or if you hear a loud knocking or pinging noise, the engine has probably overheated. You should follow this procedure...1. Pull safely off the road, stop the vehicle and turn on your emergency flashers. Put the transmission in "P" (automatic) or neutral (manual) and apply the parking brake. Turn off the air conditioning if it is being used. 2. If coolant or steam is boiling out of the radiator or reservoir, stop the engine. Wait until the steam subsides before opening the hood. If there is no coolant boiling over or steam, leave the engine running. NOTICE When making the connections, do not lean over the battery or accidentally let the jumper cables or clamps touch anything except the correct battery terminals or the ground. 5. Start your engine in the normal way. After starting, run it at about 2000 rpm for several minutes with the accelerator pedal lightly depressed. 6. Carefully disconnect the cables in the exact reverse order: the negative cable and then the positive cable. 7. Carefully dispose of the battery cover cloths which may now contain sulfuric acid. ! CAUTION To help avoid personal injury, keep the hood closed until there is no steam. Escaping steam or coolant is a sign of very high pressure. 3. Visually check to see if the engine drive belt is broken or loose. Look for obvious coolant leaks from the radiator, hoses, and under the vehicle. However, note that water draining from the air conditioning is normal if it has been in use. 165