2005 Lexus GX 470 Owners Manual - Page 521

IN CASE OF AN EMERGENCY IF YOU CANNOT INCREASE ENGINE SPEED If engine speed does not increase when the accelerator pedal is depressed, there may be a problem somewhere in the electronic throttle control system. At this time, vibration may occur. However, if you depress the accelerator pedal more firmly and slowly, you can drive your vehicle at low speeds. Have your vehicle checked by your Lexus dealer as soon as possible. Even if the abnormality of the electronic throttle control system is corrected during low speed driving, the system may not be recovered until the engine is stopped and the ignition key is turned to "ACC" or "LOCK" position. 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. When the engine overheats Pull safely off the road, stop the vehicle and turn on your emergency flashers. Put the transmission in "P" and apply the parking brake. A: If steam is coming from your engine: Turn off the engine. Leave the hood closed until there is no sign of steam or coolant. Your engine could have been seriously damaged already. Call your Lexus dealer for assistance. CAUTION Be especially careful to prevent erroneous pedal operation. CAUTION To help avoid personal injury, keep the hood closed until there is no steam. Escaping steam or coolant is sign of very high pressure. 496