2009 Toyota Highlander Owners Manual - Page 569

6-1. Specifications Ignition system Spark plug Make Gap DENSO SK20R11 NGK IFR6A11 0.043 in. (1.1 mm) NOTICE n Iridium-tipped spark plugs Use only iridium-tipped spark plugs. Do not adjust spark plug gap. Electrical system 12-volt battery 12.6 ⎯ 12.8 V Fully charged 12.2 ⎯ 12.4 V Half charged 11.8 ⎯ 12.0 V Discharged (*: Voltage is checked 20 minutes after the hybrid system and all the lights are turned off) 5 A max. Open voltage* at 68°F (20°C): Charging rates 544