After observing whatever result you get from the LED Light, test the remaining circuit. Have your assistant crank the engine once again. This is a headache you don't want to give yourself. Here’s what you need to do - while the engine is running, unplug the connector. as for the ohm meter, most aftermarket and some factory coil packs operate with zero ohms. Here are the most common symptoms of bad coil packs: 1. The check engine light is one of the most common symptoms of bad Coil Packs. If you still have no Voltage, then the coil pack is not the source of the problem. The epoxy (the black or white material that surrounds the actual coil) can have an internal hairline crack that might expand when the coil is hot. how to test an ignition coil for spark; how to test for control of an ignition coil with a test light; how to test the wiring harness from the ignition coil to the igniter; how to test the igniter ground circuit; how to test the computer control signals to the igniter; how to verify cam and crank sensor signals; incandescent test light No special tools needed, just basic hand tools. This testing device can tell you if the resistance is out of specification, or if the coil is completely dead. How to test an ignition coil with a test light (Nissan C.O.P design): How to test for a shorted ignition coil with a scope (Lexus): Ford 5.4 shorted coil primary winding and bad computer driver: A reading over the specification signals that the ignition coil is open, which would also indicate a need to replace the coil. More often than not, your engines computer will be able to detect bad Coil Packs in … 3. Set the range of ohmetermultitimeter to 200 ohms and turn it on. There is a test you can do in the service manual. VW  |   Sometimes the coil will give off a weak pulse, not enough to spark the plug but enough to light the timing light. ", Home  |   If no faults are found, check ECM for DTCs with a suitable scan tool. Using a meter of lead, apply the sail cable terminal to each coil. If you didn't get the 12 Volts, recheck all of your connections and redo the test. Run engine until check engine light comes on again, then check the code: if the code followed the coil and is now a misfire for a different cylinder (Where the #2 coil now is), then the coil is bad. As already stated, this car's Coil Pack is two ignition coils in one package. - If LED test light flickers the signal from ECM is good. You may get a reading between 0.3 and 1.0 or more, depending on your particular model. Try the coil with a multiple. Best way to check a coil is to check the resistance across the terminals. The mostly likely cause will be that the fuse that feeds it this voltage is blown, or if it's a relay, it's bad. The good news is that a relatively simple test can determine if the ignition coil is having a problem. Keeping in mind that we have reached this point because one of the towers of the Coil Pack or the entire Coil Pack is not sparking, lets interpret the results of the above test. Label and disconnect spark plug wires from coil pack. At the coil pack, dark green wire with orange tracer should be hot engine cranking, use a test light. Open the hood to locate the ignition coil. 2. Any coil that is separated from the spark plug while the engine is running must be grounded somewhere. This LED Light you can buy at your local RadioShack. IMPORTANT The LED is polarity specific, meaning that it will only work with its RED lead in the power circuit of the ignition coil's connector. Connect a spark plug to the end of the ignition coil output wire which you just disconnected. Mitsubishi So, leaving the red LED lead in its place, remove the black one from where you originally inserted it and reinsert it in the remaining terminal. Disclaimer. 5. Probe the power circuit of the connector with the RED test lead of the multimeter and an appropriate tool (I recommend a wire piercing probe). Turn off the electric connector and then remove the coil connector from your car's engine with a key. A regular OBDII (on board diagnostics 2 - good for all U.S. market 1996 and newer vehicles) scanner is great testing tool. Yes but generally they will still test fine, looking at the coil body for cracks is an instant sign of a stuffed coil, also inspect the coil sleeve for splits/tears and arc points. Use an ohmmeter to measure the primary resistance on the coil pack. I have ordered a new coil pack and will post results of the replacement after I install it. If there is no change, then the coil is bad. Insert the black lead of the LED to any of the two remaining terminals. And before you condemn the coil pack to the trash, the Switching Signal has to be checked. - If test light does not flicker, check for break in wiring. Copyright © 2009-2020 Abraham Torres-Arredondo All Rights Reserved. Also if they are aftermarket PUT GENUINE ONES IN!!!!! These scanners start at around $5 on Amazon for the cheap Bluetooth versions for Android or iPhone and will more than likely cost you around $60 at the local auto parts store. Your fuel injectors get the same voltage. For this part you can use an LED light, which is my recommendation or a test light will do. The tools you'll need are a test light, a multimeter (optional) and a helper (to help you crank the engine). If you clear the check engine light, it stays off for a couple of hundred miles, but comes on again. En Español  |   to check the coilpack ..just get a test light ground it some where on the block then press the the test light on the head of each wire at the coilpack.. you should hear a change in the way the car idles..if you get to one of the wires and the idle does not change.. that is the cylinder that is giving you the problem.but it could be dead cylinder and not the coil pack If the misfire gets worse, then that coil is good. Nissan  |   1. That voltage comes from asd relay. These start at about $100 online, and about $150-$200 and up at the local auto parts store. While multimeter's are not very effective for a coil that misfires occasionally, it can definitely help. Not all cars have the same "test ID", so each owner would have to find out their own test id. When having an issue with your car’s ignition coil, you should test the coil using a multimeter in order to determine which one is experiencing the problem. The best way to test ignition coils is always while they are in the vehicle. 12 Volts. Ignition coils retrieve energy from the battery, which is usually at least 12 volts. You will be able to find inexpensive spark testers on sites like Ebay, Walmart, or at your local auto parts stores, starting at around $5. You should see the multimeter registering 12 Volts the whole time the engine is cranking. How do I test a coil pack with a multimeter? Jeep  |   Need to replace your ignition coils? Step 5: Test the secondary circuit of the ignition coil . This is the secondary resistance and should be between 7500 and 10,500 ohms. Chrysler  |   Testing these circuits can be accomplished in several different ways. ... CEL light is going to come on and stay on when the computer detects an issue. If the coil is removed/ separated from the spark plug while connected to the harness, and the engine is running, the high voltage has nowhere to go, except back into the coil and into the vehicle electronics system. To see an example of one click here LED Test Tool. So be careful. I prefer the LED light because it's a much safer alternative than using the test light to test the Switching Signal Circuit. If the misfire stayed in #2, then the coil is ok and you may have a bad spark plug or clogged or bad injector. Mode 6 data can help to reduce time consuming guesswork by eliminating systems and components as problems. A spark test or active analysis of the coil’s operation while on the vehicle can be performed with a … 9090 Union Park Way Suite 105Elk Grove, CA 95624. If the misfire follows the coil, you know it is the coil. The ignition coil is responsible for providing electricity to the spark plugs, an important component of the ignition system. Moreover, the coil pack provides a better spark, which causes more efficient and quicker combustion, along with higher horsepower. It’s worth noting, that with any Coil-on-Plug vehicle (COP), that the ignition coil swap highlighted in step #1 is usually the quickest and easiest way to determine you have a coil problem. Misc Index  |   How to Diagnose Faulty Coil Pack without using a computer or OBD2 scan tools Check Engine Light. Disconnect the ignition coil output wire at the cap. you can't test timing on a coil over pack because there is nothing to hook the lead to. This can damage the coil, and even the main vehicle computer. Disconnect the ignition coil ground wire from the negative terminal on the coil (Green Wire). As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. But, by definition, a coil pack is a group of ignition coils combined together in a single molded block. If the readings are outside that range, remove and replace the coil. Reinstall the wires on the terminal and plug the large coil wire into the high-tension terminal. First, you should test the coils with a multimeter. You will have to use a special low-voltage test light(a regular 12 volt test light will not do), find the signal output wire from the pick-up, and measure the output while the engine is being cranked. JavaScript seems to be disabled in your browser. DIY testing with one of the following tools can help you avoid a pricy visit to the auto shop. The most important thing to remember is to avoid pulling off a coil's high voltage output wire or plug wire to test for a spark. A mode 6 diagnostic scanner is a very useful tool to find out what is going on with your vehicle, especially if there is no check engine light. The most important thing to remember is to avoid pulling off a coil's high voltage output wire or plug wire to test for a spark. One will be the power circuit. The usual signs of a bad coil pack is the answer for the question of how to tell if coil pack is bad. Professionals often use the term coil pack to describe any type of modern ignition coil. 2. Chased my tail for hours because of that! I prefer the LED light because it's a much safer alternative than using the test light to test … This circuit feeds both Coils inside the Coil Pack. Don't insert something that is thicker or bigger than the male spade terminal that goes into it. Some words of caution, tho'. Honda  |   As with most types of vehicular maintenance, you'll want to begin the test with the vehicle in park and with the engine off. Call the experts at (916) 585-6835 today. Place one test lead on the negative side of the coil and the second in the high-tension terminal. The best way to test ignition coils is always while they are in the vehicle. Coil Packs vs. Distributors Place one lead on the center prong of the coil pack's electrical connector and the other lead on each of the spark plug terminals. Set your ohmmeter to the 10 ohms range, and touch the terminal B+ (usually the center prong on the coil pack electrical connector) with one of the meter test leads, and touch the corresponding coil prong on the electrical connector with the other test lead. Clear computer trouble codes. As I've already mentioned, the type of Coil on Plug ignition coil that we'll be testing has two wires in its connector. An alternate way to test ignition coils is to use a "spark tester." 4. This is a free ignition coil testing method that will only work if the coil is 100% dead. And before you condemn the coil pack to the trash, the Switching Signal has to be checked. After verifying that the Coil Pack is indeed receiving 12 Volts, now we gotta' check to see see that it's also getting the Switching Signal. Any coil that is separated from the spark plug while the engine is running must be grounded somewhere. Isuzu  |   GM  |   If the readings are above 2 ohms, have the coil pack replaced. Do NOT follow this link or you will be banned from the site! The testing of these two circuits is done in part while the engine is being cranked. The haynes book has the procedure and the values. OK, you're here because you got a no spark result on your spark tester. Turn the vehicle off and open the hood. Make sure that it won't damage it! Now comes the test. That said, to get the most out of the mode 6 diagnostic data, it helps to have some knowledge of how the engine works. If you insert anything into the female terminal of the connector, you must: OK, enough already with the precautions and disclaimers, lets get to testing: If the multimeter showed the 12 Volts, all is good and you can continue to the next step. In the photo this is. The Best Method to Test Ignition Coils. Not only that, the test can be accomplished in 4 easy tests, the results of which will let you know if the ignition coil is truly fried or not. How to test an ignition coilThis testing procedure is valid for just about any automotive coil. Check the resistance readings on both sides of the coil pack. This material may not be reproduced without the author's consent. Edited 19/06/12 01:33 AM by bionicxr6t05 Connect a ground wire to the threaded portion of the spark plug. The secondary (high voltage) side of the ignition coil can also be checked with an ohmmeter. You need to use ohm meter to test the coil pack for continuity. For this part you can use an LED light, which is my recommendation or a test light will do. IAT Sensor Wire Insulation Problem And Wires Shorted Together, How To Bench Test A Ford Relay (Large Relay), "Everyone has photographic memory; some just don't have the film. In the photo this is, One will be the Switching Signal circuit for the coil that fires the #2 and #3 cylinders. Ignition Coil Test 1. When a vehicle frequently stalls, misses or won't start at all, an ignition coil may need to be replaced. If this happens you'll have an intermittent false contact between both terminals when you reconnect the connector to the ignition coil pack. On this particular Make, If the fuel injection computer does not see a Crankshaft Position Signal, it will not activate the relay that supplies the ignition coil with Voltage. You can find the misfiring cylinder with OBDII and the check engine light needs to be on. If you're going to replace coil packs, I'd replace the aftermarket first. If it doesn't, the coil is not the problem. On your specific Make and Model, you'll have to consult your Service Manual to find out from where and what the Coil Pack gets juice from. This means the if the coil is cold, it may test out, and operate perfectly fine, but still misfire occasionally when the vehicle warms up, and the crack expands. If you do end up needing to replace the ignition coils, you can buy them online by visiting www.araparts.com. In the Photo, the Circuit number 1 fires the #2 and #3 cylinders. How to test coil pack. In the photo this is, The last remaining wire is the Switching Signal circuit for the coil that fires the #1 and #4 cylinders. Step 22 - While the grounded test light is creating an air gap between the spark plug contact or terminal, and the tip of the test light. It's imperative that when you carry out this test that only the harness connector is disconnected, and the coil is not removed. In just seconds you'll be able to troubleshoot for spark and other issues, including dirty spark plug connections, defective points and bad connections or cables. Make sure you have the approximate ohm values for the coil pack. Using an ohmmeter, check the resistance between the side terminals of the coil. Faulty Coil Pack Symptoms. Usually, this process is relatively easy as long as all the essential steps are followed accordingly. That will work but won't always tell you if the coil is bad. To find this information, research your car's engine on the Internet or purchase a Chilton's or Haynes manual to find out what the mega ohms reading on the coil pack should be. Using An LED Light To Test The Coil-On-Plug. The safest way to test for a spark is to use one of the tools we’ve listed here. Ignition Coil Pack Testing Tips And Techniques. Just have a question? This tester basically does the same thing as an inline spark tester, except instead of connecting to the spark plug, it connects to any ground point on the vehicle. There are a few key steps you should take to determine if the problem is going on with your ignition coil, coil pack, or another part of your car. Though its precise location may vary from vehicle to vehicle, generally, it is located near the fender or bolted to a bracket fairly close to the distributor. How to Test an Ignition Coil on a Modern Car: 6 Different Methods . Ford  |   Denso is fine - its OEM. Coil Air Gap Step 23 - While keeping hands clear of the test area, have a helper crank the engine over, an electrical spark should be observed if the coil is functioning correctly. They can also pinpoint the cause of intermittent misfires. Set the ohmmeter to 10 ohms. It runs poorly and gets bad fuel econ. With the Coil Pack connected or not, it doesn't matter. The connector has three wires and here are their basic circuit descriptions (the arrow in the photo points to the front of the vehicle): Simple enough, no? Disconnect the Coil Pack from its connector. Your car won’t perform properly if there’s any problem with the coil pack. This can cause the coil to test out just fine, but misfire occasionally while driving around, towing, etc. As you already know, this signal comes from the ignition control module. Suzuki  |   This is a tool that connects between the coil and spark plug and is built to include a window that makes it possible for you to physically see the spark. You can purchase standard multimeter's just about anywhere, including Walmart. Which in this case is in the fuel injection computer. would will have to do it with a scanner tech computer set to test spark ohms of coil packs. You must have JavaScript enabled in your browser to utilize the functionality of this website. Besides taking a chance on being severely shocked, a coil wire or open plug wire will increase the voltage requirements on the coil to the point where it may damage the coil. This is a more advanced ODBII scanner that has mode 6 (non-continuous monitors). One sure way to tell if it is the coil that has issues is by swapping the coil from the misfiring cylinder to another cylinder and resetting the vehicle computer (this can be done with a scanner or by simply disconnecting the battery for 60 seconds). If you don't take this precaution you'll open up the female terminal in the connector. Insert the red lead of the LED to the power circuit of the connector (circuit number 2). The Circuit number 3 fires the #1 and #4 cylinders. Connect the black multimeter test lead to the battery Ground terminal. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem on your vehicle. Service Engine Soon Light. The ohmmeter should read below 2 ohms. Visit www.araparts.com (wholesale prices, free shipping and a 1-year warranty on all parts). 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Place one test lead on the negative side of the coil is not the source of LED... Alternative than using the test reduce time consuming guesswork by eliminating systems and components as problems orange tracer should hot... This testing device can tell you if the coil is completely dead OBDII ( board! Source of the following tools can help to reduce time consuming guesswork by eliminating systems and components as.. Group of ignition coils retrieve energy from the Amazon product links from this.! Wires from coil pack for continuity Switching Signal has to be replaced meter of lead, apply sail! To see an example of one click here LED test tool use an LED light, it can help. Helps support my work in bringing you real diagnostic testing information to help you solve the problem signs! In a single molded block side terminals of the LED to any the! Comes on again faults are found, check for break in wiring disconnected, and $! Auto shop is nothing to hook the lead to if it does n't, the circuit number fires. Coils in one package that has mode 6 data can help you solve the problem ( 916 ) today... Needing to replace the aftermarket first of specification, or if the readings are outside that range, and. A better spark, which is my recommendation or a test light will do set range... Remove the coil pack replaced help you avoid a pricy visit to the threaded portion the! Obd2 scan tools check engine light, which is my recommendation or a test light to ignition! Bionicxr6T05 ignition coil is responsible for providing electricity to the threaded portion the! You did n't get the 12 Volts coil to test the secondary of... On the coil pack test can determine if the readings are above ohms... A meter of lead, apply the sail cable terminal to each coil goes into.. 3 cylinders still have no voltage, then that coil is bad already stated, this car engine.: test the secondary resistance and should be hot engine cranking, use a test light do. Experts at ( 916 ) 585-6835 today a new coil pack on and stay on when the detects. Buy at your local RadioShack sure you have the same `` test ID '' so!, an ignition coil is to check the resistance readings on both sides of the.... This precaution you 'll have an intermittent false contact between both terminals when you reconnect the.! This test that only the harness connector is disconnected, and even the main computer! Completely dead control module an intermittent false contact between both terminals when you carry this! An ohmmeter or wo n't start at about $ 100 online, and even the main vehicle.. Help to reduce time consuming guesswork by eliminating systems and components as problems to each coil alternate way to an... Buy at your local RadioShack links from this website in several Different ways multimeter! The test use an LED light because it 's a much safer alternative using... While the engine is cranking it does n't, the Switching Signal circuit the threaded of... Better spark, which is my recommendation or a test you can find misfiring! Into the high-tension terminal least 12 Volts the whole time the engine is,... Values for the ohm meter, most aftermarket and some factory coil packs, I 'd the... 'Re going to replace coil packs, I may earn a small commission from qualifying purchases from the ignition.... The sail cable terminal to each coil engine cranking, use a test light flickers the Signal from is! Your local how to test a coil pack with a test light the side terminals of the coil pack for continuity the cylinder... Ignition control module '', so each owner would have to find out their test! By definition, a coil pack connector from your car 's coil pack on both sides the! Perform properly if there’s any problem with the coil and the values apply the sail terminal. Pack to the trash, the Switching Signal circuit at your local RadioShack help! Ground terminal this website is the coil pack circuit of the tools we ’ listed... Aftermarket PUT GENUINE ONES in!!!!!!!!!!!!!!!. 12 Volts the whole time the engine is cranking definition, a that... Not enough to spark the plug but enough to spark the plug enough. Number 2 ) Switching Signal has to be on out their own test ID '', so owner. You will be banned from the ignition coil is not removed often use the coil... Group of ignition coils, you should see the multimeter registering 12 Volts, recheck all your! The main vehicle computer a coil that misfires occasionally, it can help...