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Voltage Drop Test Guide for Toyota Starting Systems
The herein steps will guide you with typical procedure for performing voltage-drop tests on Toyota starting systems. The schematic shown the voltage-drops test schematic using a voltmeter device or a Sun VAT-40 tester. This voltage-drop testing may detect excessive resistance in the starting system.
And this is how to perform a voltage-drop test of the insulated side of motor circuit for your vehicle:
Understanding the Basic Construction of Idle Speed Control System
The herein diagram provide information related to the Basic Construction of Idle Speed Control (ISC) System typically for toyota car engines if you want 
to understand it by yourself. The ISC system controls engine idle speed by adjusting the volume of air that is allowed to by-pass the closed throttle valve.
The Idle Speed Control System regulates idle speed under the following conditions, depends on application such fast idle, warm curb idle, air conditioner load, electrical load, and automatic transmission load. Engine ECU, ignition switch, air intake chamber, ISC valve, throttle valve, battery, sensors and air cleaner involved in the Basic Construction of Idle Speed Control System.
