Voltage Drop Test Guide for Toyota Starting Systems
Sponsored LinksThe 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:
1. Set the voltmeters to a low scale (or set to 3V if using Sun VAT-40)
2. Voltmeter lead red to the battery (+) terminal, and black to C terminal of starter motor magnetic switch
3. Ensure that the ignition is disabled (disconnect the IIA plug or the power plug to the remote igniter assembly/black-orange-wire)
4. Crank the engine and see the voltmeter
– < 0.5V indicates acceptable resistance
– > 0.5V indicates excessive resistance, locate the cause
5. Acceptable voltage drops are 0.3V across the magnetic switch. 0.2V for the cable, Zero Volts for the cable connection. Do some repair or replacements as needed.
(source: toyota.com)
