Tip & How-To about BMW 325
When you get fault codes they are the worst, but here are a few tips on doing your own diagnostics at home. The equipment that you will need is pretty basic and do not generally cost much and you can make a few yourself. I like to have at least 3 jumper wires, a test light, and a digital multimeter.
This is a basic model and can go for anywhere from $15-$30 USD
This is the best way for checking continuity on just about any motor or sensor.
These are just about essential for transferring power over a suspicious relay or fuse.
A lot of the times users ask us on our website about the best way to check if a relay is bad or if a component is faulty. With a jumper wire and a test light at your side they can ultimately find your trouble.
How to use a Test Light;
Test lights are useful, but they can be harmful too, that's why knowing what and how to do with then is important. test lights generally just jump a power source and illuminate a bulb. this is useful, however you can also short a circuit with one or send too much voltage to a resistor (sensor) also. that is why using a test light to check continuity of a 12v circuit is basically all you can do with it, but that is more then enough in most cases.
When using a test light connect the clamp to a good known ground and touch the probe to the component that is suspected of being shorted to ground. if the light comes on then you know that the component is grounded. Therefore you have continuity. No light no power. you can also test for typical short by clamping the test light to the battery positive and testing grounds.
How to use a multimeter;
The multimeter has been around for about 40 or so years and since electronic fuel injection had become the modern technicians "go to" tool for all kinds of check engine and short circuit issues.The models vary from manufacturer to manufacturer, but al do the same thing and that is tell you whether or not there is the right resistance and good voltages coming into and out of sensors, motors, and batteries.
How to use Jumper Wires;
Jumper wires are easy to make and even simpler to utilize. they basically are used to test whether or not relays, fuse links, and circuits for bad lines receiving power or whether or not there is power going to the component in question.
Posted by Justin... on
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