Just want to test them to make sure they still work. This type of tester can be used on any tool with a small engine, including a weed eater, a chainsaw or a snow blower. Pickup coil testing the pickup coil, located under the distributor cap on many electronic ignition engines, can cause a nospark condition if defective. Then, when you pull the starter cord, watch for a spark in the tester window. A spark jumped the gap during both tests and engine ran until shortly after i removed my foot from clutchbrake pedal. Other reasons may include to control spark timing on a per cylinder. How to check coil packs with a voltage meter it still runs. Ignition coil primary circuit switching test courtesy of ford motor co. Attach the pink wire from the tach to the ignition green wire with the large. Virtually all vehicles manufactured today use ignition coils. To test your weed eaters ignition coil, connect the tester between the spark plug boot and the engine. If you do not have one, you can buy one at a home center or building center. If the light does not pulse, replace the ignition module. How to test the ignition module for john deere lawn tractors.
Connect a jumper wire from negative terminal of the coil to a good engine ground. An ignition coil also called a spark coil is an induction coil in an automobiles ignition system that transforms the batterys low voltage to the thousands of volts needed to create an electric spark in the spark plugs to ignite the fuel. Special tool for ignition coil replacement 18 testing and checking 20 stepbystep defect identification 21 self test 22. If the bike had only one pink or pinkblack wire at the coil, connect this to the ignition green wire. Notice federal and many state laws prohibit the removal, modification or rendering inoperative of any part or element of design affecting emissions or safety on motor vehicles used for.
Singlespark or twinspark coil fully electronic ignition system primary. I performed the spark test as bert suggested using a tester with a large visible gap. Some coils have an internal resistor, while others rely on a resistor wire or an external resistor to limit the current flowing into the coil from the car. Fewer emissions, lower fuel consumption, higher ignition voltage, restricted space in the drive unit and. When a vehicle will not start, misses often or stalls frequently, its ignition coil may need replacement. This is a step by step how to test tutorial that will take you by the hand, so to speak, to diagnose and troubleshoot a misfire condition on your suzuki or chevrolet car or truck. Clip one end of the spark tester service part number 19368 to the ignition cable and the other grounded to the cylinder head as shown below. However, you can test the coil pack on your car using a voltmeter. Ignition coil primary resistance 1 place ignition switch in off position. During the test, both kill wires to the coils were disconnected, the other plug wire was connected to the plug.
Correct coil polarity wont 43 eliminate these problems, just put them off by 15%. Coils are sensitive to heat and may produce an intermittent problem if their internal components become weak. Diy ignition coil energy testing to measure the spark current a shunt resistor is added in the circuit and the voltage across it measured with an oscilloscope. I have a bunch of coils out of saws that were scrapped. A bad spark plug or ignition module can put a john deere lawn tractor of commission and prevent you from completing routine lawn maintenance. Note that for a one cylinder engine there is a direct electrical path from the plug cap through the hv wire, and coil to the engine.
The coil is probably the easiest thing to check and therefore the first thing to check when embarking upon ignition system troubleshooting. Dec 15, 2015 this video is used by my students to learn how to disassemble, test, and reassemble the ignition system on the honda gx160 engine. While one solution might be to increase the output energy of the coil, delphi. You can usually test your ignition coils by plugging a diagnostic machine, like an odb2 scanner, into the port underneath the dashboard and turning it on.
Sep 18, 2018 to test your weed eaters ignition coil, connect the tester between the spark plug boot and the engine. How to test an ignition coiltesting the ignition coil and the spark plugconnect the tester between the spark plug boot and the spark plug. It may also be necessary to replace coils if an engine misfires or has weakened acceleration, a rough idle or reduced gas mileage. Youll want to start by checking for signs of bad ignition coils, and then follow up that diagnosis by testing the coils with a. Ignition coil air gap air gap adjustment specification gxseries 160, 240, 340, 610. Testing the ignition coil is not hard at all and ive written a how to test the 19921995 2. Cylinder ignition coil electronic ignition system with mapcontrolled ignition primary. Aug 23, 2018 a bad spark plug or ignition module can put a john deere lawn tractor of commission and prevent you from completing routine lawn maintenance. How to test a spark plug ignition coil yourmechanic advice. There are different possibilities available for checking the ignition coil. In this test, you pass a small electric current through the wire.
An ignition coil is a vital component of todays modern engine management system. In this case magneto will produce and supply current to the primary winding. Most later models use briggs and strattons magnetron coilsessentially a selfcontained ignition system that derives its power from the magnets on the flywheel. Luckily, a relatively quick, simple test can determine whether. Mar 22, 2017 the location of the ignition module that actually drives ignition primary coil is located in each cop. When testing multiple coil systems, the current ramp gives an excellent comparison of current flow through each coil in the ignition system and usually helps the technician arrive at a more accurate diagnostic conclusion. Attach positive red lead of your voltmeter to the positive side of the coil, and the negative black lead to an engine ground. Ignition coils in motor vehicles function, diagnosis. How to setadjust the air gap on small engines armature magneto coil duration. Many defective ignition coils, for example, will pass a resistance test but fail a current ramp test.
The objective is to reduce energy losses by bringing the coil output as close as possible to the spark plug. Its impractical to uncover the coil and examine the wire. The pcm sends a trigger signal to the cop to fire the coil, and the module in the cop has a module to control the primary circuit. Now read the voltage at the positive coil terminal. Attach an 18 or 20 awg jumper wire from the negative coil terminal to an engine ground. The ignition coil consists of a single wire wound hundreds of times around a core, and any break that occurs in the wire renders the coil inoperable. If a dtc is present, perform troubleshooting in accordance with the procedure for. Coil and hv wire resistancecontinuity test for onecylinder engines the next test checks for a continuous path for the spark through the hv wire and the ignition coil. C diagnostic testers 43 diagnostic test ignition coil test only bear tester all engines. I see lots of posts on hooking a ground wire to the negative side while powered up to test the coil, fact is this may or may not work as without the condensor to clean up the break most of the time it wont work every time. How much resistance ohms are suppose to be on briggs.
Magneto ignition system is mainly used in 2wheelers, kick start engines. Testing the ignition module can often reveal a problem that is easy and inexpensive to fix, restoring operation and getting you back in the drivers seat. Please ensure you follow manufacturers safety instructions and working practices and ensure the rated voltage for all accessories you are using meets or exceeds the expected. Coil on plug is a concept where each spark plug is ignited by its own individual ignition system, consisting of a driver or ecm and ignition coil. Testing or checking an ignition coil can tell you a lot about the health of your ignition system. The energy that is stored in the magnetic field of the core is the energy that is transferred to the spark plug.
The igniter ignition control module has 5 wires coming out of its connector. Clip one end of the spark tester service part number 19368 to the ignition cable and the other grounded to. It is less likely for this type of ignition control module to fail in such a way that causes the loss of all ignition system function. The purpose of this test is to examine primary ignition voltage on an external coil type ignition system.
The location of the ignition module that actually drives ignition primary coil is located in each cop. When testing multiple coil systems, the current ramp gives an excellent comparison of current flow through each coil in the ignition system and usually helps the technician arrive at a. This video is used by my students to learn how to disassemble, test, and reassemble the ignition system on the honda gx160 engine. The pickup coil must generate an ac voltage pulse to the ignition module so that the module can pulse the ignition coil. Dual coil ignition coils ignition coil production 14 stepbystep to a precision product 14 tested quality 15 the genuine article and fakes 15 workshop tips 17 reasons for replacement 17 professional removal installation 18 special tool for ignition coil replacement 18 testing and checking 20 stepbystep defect identification 21 self. Naval air rocket test station, until 2 january 1970, when i retired from its successor, the liquid rocket propulsion lab oratory of picatinny arsenal, i was a member of the unofficial, but very real, liquid propellant community, and was acutely aware of what was going on in the field, in this country and in england. A coilonplug is designed to perform the functions of the ignition coil creating the spark energy and the spark plug wire set containing and delivering the high voltage energy. The ignition coil, a vital component of any vehicles ignition system, is responsible for providing electricity to the spark plugs. Once the winding inside weakens or breaks, the problem is irreversible. A pickup coil contains a coil of wire, and the resistance of this coil should be within the range specified by the manufacturer.
The common cause of one drivertransistor failing is a shorted ignition coil primary winding. This test involves measuring a potentially hazardous voltage. I reread the manual page i looked at a little too fast apparently and realized that while its instructing you to measure the resistance across the ignition coil, the purpose of that test is to check the kill switch, not the coil. Mar 19, 2010 now for a out put check bench test using the diagram below. Jun 29, 2019 testing the ignition coil is not hard at all and ive written a how to test the 19921995 2. Measuring the primary and secondary resistance requires an ohmmeter, and a digital readout is best if you have access to one. Do not connect the ignition tach wire to the coil or damage to the ignition may result. So hook your test light to a ground and check the spade terminal for a signal with it plugged in.
How to check a lawn mower coil with an ohmmeter hunker. A coil onplug is designed to perform the functions of the ignition coil creating the spark energy and the spark plug wire set containing and delivering the high voltage energy. Test oughly warmed sometimes not even then and of course they devoured spark plugs like a hungry elephant going after fresh roasted peanuts. Testing the resistance across several terminals on your ignition coil is the only safe and accurate way to tell if the coils is damaged or not. Without having to put them back into a saw and try it with a spark plug. A reading over the specification signals that the ignition coil is open, which would also indicate a need to replace the coil. An ignition coil consists of a laminated iron core surrounded by two coils of copper wire. The good news is that a relatively simple test can determine if the ignition coil is having a problem. When a vehicle frequently stalls, misses or wont start at all, an ignition coil may need to be replaced.
Download the free ignition coil troubleshooting guide pdf here. Primary igniton circuits how to test pico technology. Current ramp testing ignition coils know your parts. On a briggs and stratton engine, check the ignition coil first. Trispark classic twin troubleshooting guide revised dec 2018 tri0005 a and b six steps to checking the classic twin stator unit check page engine compatibility 1 ignition coil compatibility 2 air gap 3 battery voltage to unit 4 run unit self test 5 interpret the test results 6. With the test light grounded, move the test light to the negative terminal of the coil. Unlike a power transformer, an ignition coil has an open magnetic circuit the iron core does not form a closed loop around the windings. The good news is that a relatively simple test can determine if. Jan 28, 2017 download the free ignition coil troubleshooting guide pdf here. Hot on the trail of some hard information about the latest, greatest transistorized, capacitored, pointless, godsownlightning kind of ignition sys tern, we obtained some of the printed.
Most people think you can check a small engines ignition system by removing the spark plug and grounding it while cranking the engine and watching for a spark. The pcm still decides when to fire the ignition coil based on various inputs. This is a winding of wire within the ignition coil where each loop is separated by a very thin plastic coating. Depending on the ignition system and ignition coil design, the following reference values apply. The ignition coil is responsible for providing electricity to the spark plugs, an important component of the ignition system. Faulty ignition coil a faulty ignition coil can also lead to a number of engine problems, resulting in an illuminated check engine light or a vehicle that will not start. Testing ignition coil resistance values mercedesbenz forum. Apr 30, 2020 the ignition coil in your vehicle sends electricity to the spark plugs, and you might need to test the coil if your vehicle isnt starting or frequently stalls. A good coil and ignition system should produce a blue spark at the spark tester. Testing one of these coils constitutes a relatively simple process. Example, bajaj scooters, boxer, victor, splendor, passion, etc. Now for a out put check bench test using the diagram below. All about ignition coils beru your ignition experts.