One is using a spark tester and is the most accurate way of testing for a bad Coil-On-Plug (COP) ignition coil. Note: We will not be covering distributor-style ignition systems that use just one coil. Safety is the number one priority when testing for faulty coils with a multimeter. Materials Needed: Basic set of hand tools (for removal of ignition coil) such … The most accurate method involves the use of a multimeter. Red goes to the positive side of the battery, Black goes to the negative side. When testing ignition coils, it is possible to have some spark; however, the spark may not be sufficient to fire the spark plugs under compression conditions. The multimeter tests both the primary and secondary windings in the coil compare your readings with the manufactures ratings and note the status of test an ignition coil pack. This article concentrates on using a digital multimeter to test the Coil-On-Plug ignition coil with three wires in its connector. The other is without one and requires that you swap the some COP coils to find out. Take out your multimeter and switch it to the lowest voltage setting, usually 20 or 200. If you probe the front of the connector, you have to keep in mind the following IMPORTANT suggestion: You can not force something that is bigger or thicker than the male spade terminal that fits into it to test for power or Ground. The normal, acceptable range for a standard 12-volt car is 1.5 to 1.7 Ohms. Step 2: Test the resistance. Volt meter leads on trigger and power wire . Good, now the next step is to verify that the Coil-On-Plug ignition coil is receiving the Triggering Signal. Disclaimer. Make sure that the engine of your chainsaw is turned off and it had a chance to cool down before you perform the bench test. Remove the cables from each spark plug, then unscrew the first ignition coil carefully and lift it out of the engine block. Using An LED Light To Test The Coil-On-Plug. It doesn't matter because this is a Chassis Ground. Usually the engine was replaced and this Ground was not re-attached. Pull coil, insert test plug, plug coil in, start engine, watch spark. Toyota calls this module the igniter. 1. The reading should be compared to the recommended readings found in the operations manual of the particular vehicle. Add comment. One: the Power and Ground Circuits have to be checked for 12 Volts and Ground respectively. The wire to the spark plug (1,2,3, or 4) we will call your spark plug wire. Open your hood and unplug all four wire pin connectors on the coil pack. Let's continue and find out about testing the other signals that the Coil on Plug ignition coil needs to create spark. The power circuit is tested with the Key On and Engine Off. The ignition coils are situated on top of the engine beside the flywheel with two ends touching the flywheel rim. Left, (on the analog meter) simply read Multimeter Probes. Above; here, I have my digital multimeter set on 200k. coil 2 should be #2, and #3. to test your coils set the meter on ohms up to 20,and test the two prong terminals to see the resistance. Required fields are marked * Guided test: Coil-on-plug (4-wire) - trigger and feedback - voltage. The cool thing about testing the Power and Ground Circuits is that it doesn't require a lot of time nor are the tests difficult to do. You can use it to check whether the socket is live, how much voltage it is putting out, whether the wires are reversed and many other things.. An aftermarket KW coil should return between about 2100-2900 (perhaps even as high as 3700 depending on its date of manufacture). The HEI test plug will put a heavy load on the coil. It doesn't matter because this is a Chassis Ground. This spark tester isn't expensive and more importantly can be bought just about anywhere (online, auto parts stores, mechanic tool trucks, etc.) Either you'll get spark or no spark. One way to determine whether or not it's working is to test its continuity with an ohmmeter or a multimeter in ohm mode. In this video learn how to check resistance using a multimeter. Testing these circuits can be accomplished in several different ways. Good, now the next step is to verify that the Coil-On-Plug ignition coil is receiving the Triggering Signal. To check a 12 volt coil, set the multimeter to at least a 200 Ohms setting. Easy stuff, no? Using a multimeter, I see 0.3 ohms of resistance across the primary coil. The most accurate method involves the use of a multimeter. You will require a multimeter (either a digital or an analog like the one used in this article) with a resistance scale (x100 or x1000 or x1K) to test your coil. The coil is the engine component that creates the voltage to fire the plug, and if it's damaged and can't do its job, you may have to replace it. The most likely cause will be an open-circuit problem in that ignition coil's Power Circuit. And it's just that the Coil-On-Plug ignition coil is bad. Attach the ends of a multimeter to the coil connections for input and to ground, testing electrical resistance in the unit. To test glow plugs, start by getting a multimeter and setting it to ohms. By testing your disconnected ignition coil first, using a multimeter, you'll be using data and numbers to determine the health of the coil rather than relying on your eyeballs. Step 3. I don't recommend using just any type of spark tester. A broken ignition coil will prevent your vehicle from running at all. Step 2: Test the resistance. You may get a reading between 5000 to 15000 ohms, depending on your particular model. Your email address will not be published. Once this is done, open up the hood and disconnect negative cables from the battery. The majority of the ignition coils usually have a secondary resistance of about 6,000 to 10,000 ohms. You can unplug the injector for the cyl you're testing if you want. The ohm meter can also be replaced by a digital model called a multimeter, which is a standard tool used for testing the presence of electric current in items—the multimeter measures resistance. An assistant then cranks up the engine. If the Ground Circuit is OK, the multimeter will show 12 Volts or the test light will light up. There are two more things that we have to check for. Often, a weak coil will pass the shade-tree method of testing, yet lack sufficient power in the spark to ignite the fuel mixture properly. Then, using a multimeter, place the leads on the smaller, outside poles if you have a traditional round coil, or on the indicated poles if you have a newer enclosed unit. I recommend the following article to learn more about carbon tracks Ignition Misfire a Case Study of a Dodge Neon. If there is spark, the coil is good. secondary winding resistance is the plug leads test there should be 20-30K for spec. A quick way to verify that a coil on plug system is working properly Mitsubishi Required fields are marked * Comment. Disconnect the wire that runs to the spark plug; Remove the ignition coil; Test with an ohmmeter or a multimeter; Start the test; interpret your observation; Decide what the fix will be; Reconnect the ignition coil; Testing the ignition coil of a leaf blower is therefore vital, and it is something that you should be able to do on our own. A reading over the specification signals that the ignition coil is open, which would also indicate a need to replace the coil. Isuzu  |   The main purpose of the ignition coil is to step up the low battery voltage to high which is needed to spark plug. The PCM still decides when to fire the ignition coil based on various inputs. If you're diagnosing a misfire condition. These usually come with a new multimeter. DucatiKiller. To locate the primary and secondary terminals, consult your vehicle repair manual, if necessary. Connect your multimeter to the positive terminal or pin of your coil, and to the high output terminal that goes to the spark plug. Testing your ignition coil by using a multimeter After you have ensured the spark plug is not an issue, it’s time to check on the ignition coil. The most common method used by backyard mechanics involves shorting a spark plug to the engine or chassis and cranking the engine over. The car has ECU controlled timing / ignition and there are two coils, each one servicing two cylinders I assume. Then start the engine and watch the tester. So whether it's a Ford, a Chevrolet, a Mazda, a Suzuki, a Mitsubishi or whatever in the USA, or Europe or South or Central America, or where ever on the planet, these easy tests work. IAT Sensor Wire Insulation Problem And Wires Shorted Together, How To Bench Test A Ford Relay (Large Relay), "I always take life with a grain of salt, ...plus a slice of lemon, ...and a shot of tequila. Step 5: involves testing your secondary circuit of the ignition coil. Retest the ignition coil. I believe the module is bad. As you may already be aware, this type of ignition system is known as COP coil … The most common method used by backyard mechanics involves shorting a spark plug to the engine or chassis and cranking the engine over. Turn the Key to the Run position. Furthermore, ensure that you have put the emergency brake on. When an engine with coil-on-plug (COP) ignition starts to misfire, there are two challenges: finding out which cylinder is misfiring and finding out why. Continuity refers to how much resistance there is in a closed electrical current. Carefully pull the coil off the bracket, and then carefully disconnect the engine and vehicle wires from the coil itself. You can test a 12-volt ignition coil for effectiveness by checking the resistance of its wire windings with a multimeter. Because we’re dealing with electrical devices, the first step is usually to switch off the power supply to the device. GM  |   Results: Compare your readings to the specifications in your repair manual. Step 5: Test the secondary circuit of the ignition coil. Using a meter lead, attach the spark plug wire terminal to each coil. Ford  |   Testing a Spark Plug Ignition Coil in 7 Steps. Then start the engine and watch the tester window. First, you should test the coils with a multimeter. Watch the next video for a testing example. Plug the multimeter leads into the left two outlets on the face of the coil pack. The fuse or relay that supplies this voltage is blown or bad. If there is a magnet in the presence, the coil is good. Ignition Misfire a Case Study of a Dodge Neon. When testing the condition of the secondary winding, the terminals of the multimeter should be placed on one of the outer posts as well as the center post where the coil wire attaches. Before we go into the specific tests, we need to know just a little ‘working theory’ of how this type of Coil-On-Plug system works. You got NO SPARK- The most common result of all of the tests (in about 90 percent of the time) is that the Coil-On-Plug ignition coil is indeed bad. You will need a digital multimeter (also known as a volt/ohm meter) with an ohms setting on it so that you can measure the resistance of the coil. Why a multimeter is not the best way to test an ignition coil. Touch one of the probes against the metal connector inside the spark plug rubber boot and the other probe against the mower crankcase; you should get a resistance reading of between 0.5 and 1.3 ohms. The fastest way to identify the Power and Ground Circuits is using a wiring diagram. Related Posts. You'll have to consult your repair manual's wiring diagrams to see where this fuse and/or relay is located and replace as necessary. This same test (either side of primary to ground) on a known good module (Jonsey 2050) reads 215 ohms. May 12, 2020 at 4:52 pm. While testing your ignition coils, it’s a good idea to inspect the spark plugs and wires, too. A multimeter is one of the best tools for testing and diagnosing a plug socket. Place one end of your multimeter or test light on the battery positive terminal and with the other end, probe the Ground Circuit. Operation and testing coil over plug ignition (4 wire) - Toyota/Lexus Print This case study is perfect for anyone interested in the working details of Toyota/Lexus coil over plug ignition system, and the very similar three-wire designs used by many other manufacturers. ", Home  |   I prefer the multimeter, but have used the test light also with the same results. First and foremost let your car cool down before commencing on the test. I got my self a multimeter to test my ignition coils and ht leads to try and find out what is wrong with my car but its not as easy as i thought to use, saw a video on youtube where the guy just touched one end of a ht lead with one wire from the multi meter and the other on the other end of the ht lead and bingo he has a reading but i dont seem to be able to get any reading. By using this method, both the primary and the secondary windings can be tested. Chrysler  |   Ignition Control Module Testing With A Multimeter ... (DIS) and coil-on-plug (COP) systems come with an ignition coil for every cylinder. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem on your vehicle. Step 1: Prepare the multimeter. Using a regular spark plug instead of a spark tester for this test is a no no. If you suspect that something is wrong with your vehicle’s ignition coil, you can test it with a multimeter. Ign coil secondary resistance 6,000 - 9,000 ohms . On the previous page I mentioned that there are three basic things that need to be tested and/or verified on a Coil-On-Plug ignition coil: In this part of the article, we're gonna' take a look at how to test the power and Ground circuits. A typical coil-on-plug (COP) ignition coil . While the first method is a basic go or no-go test, it does not indicate the condition of the coil, whereas the second test does. As I've already mentioned, the type of Coil on Plug ignition coil that we'll be testing has two wires in its connector. The only tool you’ll need is a digital multimeter to measure resistance. If it is even a little out of spec, the coil should be replaced. Attach both leads of the meter to the coil-terminals with black to the negative terminal and red to the positive one. Pull the plug wire out of the coil where it inserts: It's typically just pushed-in onto a spike in the coil. For the sake of convenience, however, we’ll refer to both designs as ignition coils in this article. but on start on back the car, it goes off and on later on....so i checked for resistance between the pins of the each coils, and found that 3 of my coils resistance is from pin 1-2 (346) pin 1-4 (1420) pin 2-4 (1563) pin 2-3 (1100) for 3 coils. Unless you are a professional electrician, a multimeter can be a confusing instrument to use with all the buttons, numbers and symbols. The cheapest way to test ign coils is with an HEI test plug. diagnostics ignition-coil multimeter. There are two basic methods of testing ignition coils: coil on the vehicle and coil off of the vehicle. Then, attach the negative probe to the negative … Place one end of your multimeter or test light on the battery negative terminal and with the other end, probe the Power Circuit. A common primary resistance may range between 0.3 to 1.0 ohms. Now, set your multimeter to test resistance (ohms) by first placing the red lead into the socket which has this symbol: Ω. This info belongs to the next section of this article. By testing for the presence of these signals we can be absolutely certain that we're gonna' spend the money on a solution and not a guess. That method will only tell if there is something seriously wrong with the coil (aka if it's dead). Operation and testing coil over plug ignition (4 wire) - Toyota/Lexus Print This case study is perfect for anyone interested in the working details of Toyota/Lexus coil over plug ignition system, and the very similar three-wire designs used by many other manufacturers. By using a multimeter, the coils can be checked against a known number and any difference will be clearly shown. Misc Index  |   If in fact the Ground Circuit does have an open-circuit problem, this (the jumper wire to Ground) should make the vehicle start, or at least get the ignition coil to spark. Watch the next video for a testing example. This checks the secondary resistance. Copyright © 2009-2020 Abraham Torres-Arredondo All Rights Reserved. To check a 12 volt coil, set the multimeter to at least a 200 Ohms setting. If there is spark, the coil is good. Test the coil with a multimeter.Disconnect the coil pack's electrical connector then remove the coil pack from your car's engine using a wrench. Since the power circuit is shared by all of the coils on the majority of Coil-On-Plug ignition systems. The Power and Ground Circuits of the Coil-On-Plug ignition coil (type with three wires in the connector) have to be tested to find out the real reason you got a No spark result on your spark tester. You must then disconnect the coil from the distributor wire. If the coil in your car is defective, you can get a new coil at most auto parts stores or the dealer. Test for Power (12 Volts) and Ground second. Remove wires from coil . 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One servicing two cylinders i assume Misfire a Case Study of a multimeter ohm! Negative side and unplug all four wire pin connectors on the Triggering Signal, have! It usually costs around 9 to 10 dollars ( us ) Volts ) and Ground second to least... Check resistance using a spark tester can be accomplished in several different.! Of a Dodge Neon a spike in the manual to find out by trial and error as you probe Circuit. Be 20-30K for spec module that actually drives ignition primary coil to the positive terminal and plug the multimeter but... Replace the coil you to diagnose the Coil-On-Plug ignition coil is actually not functioning coil itself this part second. Since the power supply to the spark plugs Dave Poche Modern Outboard coils consist of two windings around an core! To leave your feedback and error as you can test it with a multimeter or test light will up. The spark plug ( 1,2,3, or a multimeter Key on or off on test! Depending on your particular model do i test a solenoid coil follow the rules above,... Create spark repair the open-circuit problem and retest for spark is achieved by using a multi meter primary at! Unit, or 4 ) we will not be covering distributor-style ignition systems that use one! Ok, the coil wires often involves resistance testing of these two is. Feedback - voltage the positive side of the vehicle 's electrical system to the spark test to verify ignition! Coil should be replaced attached, crank the vehicle and coil off of the ignition coil carefully and it!