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. This spark tester isn't expensive and more importantly can be bought just about anywhere (online, auto parts stores, mechanic tool trucks, etc.) Only a dedicated spark tester will stress test the Coil on Plug ignition coil. Since the Ground Circuit is shared by all of the coils on the majority of Coil-On-Plug ignition systems. 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. That coil is in range! This same test (either side of primary to ground) on a known good module (Jonsey 2050) reads 215 ohms. 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. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem on your vehicle. To test the primary resistance on the coil, grab a multimeter and attach the positive probe to the positive terminal on the coil. Using a multimeter, I see 0.3 ohms of resistance across the primary coil. Make sure you continue to wear your leather gloves through this part. Either you'll get spark or no spark. Testing these circuits can be accomplished in several different ways. To check a 12 volt coil, set the multimeter to at least a 200 Ohms setting. First and foremost let your car cool down before commencing on the test. This material may not be reproduced without the author's consent. One of the coil’s terminals should be shown leading to the spark plug. Name * Email * Website. You can probe the front of the female terminals of the connector or (like what I do) use a wire-piercing probe to test the wire itself (like in the photo above). A weak or damaged ignition coil can cause engine misfires, stalling, and lower fuel economy. Using An LED Light To Test The Coil-On-Plug. 1. Put the securing screws aside. You got Ground 1. The most common method used by backyard mechanics involves shorting a spark plug to the engine or chassis and cranking the engine over. Good, now the next step is to verify that the Coil-On-Plug ignition coil is receiving the Triggering Signal. Now, you don't have to read the entire article to use the info presented here but, I suggest you do. Nissan  |   Connect your meter leads to the primary terminals at the bottom of the ignition coil. Ford  |   Replacing the ignition coil with a new one will only be a waste of time and money since, without Ground the new one will not spark. The reading should again be checked against the recommended reading found in the manual and the coil replaced if there is any variance. Let's continue and find out about testing the other signals that the Coil on Plug ignition coil needs to create spark. i found out that it might be a faulty coil on plug for cel sometime light on and rough idle. Usually the engine was replaced and this Ground was not re-attached. Testing a Spark Plug Ignition Coil in 7 Steps. Disclaimer. Any variation at all from the recommended reading is a sign that the coil should be replaced. The only tool you’ll need is a digital multimeter to measure resistance. If you are reading less than 3, or more than 5, replace your coil. 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. The Ground Circuit is tested with the Key On or Off. Mitsubishi This test should read 3-5 ohms. The cheapest way to test ign coils is with an HEI test plug. I believe the module is bad. The majority of the ignition coils usually have a secondary resistance of about 6,000 to 10,000 ohms. After repairing the short, re-do the spark test to verify the ignition coil is now working. Step 1: Prepare the multimeter. To test the resistance of the coil in your chainsaw which is called a bench test, take your multimeter and remove the coil from your chainsaw to get easy access to its electrical terminals. Yet, getting a No spark result does not necessarily condemn the Coil-On-Plug ignition coil to the trash can. Here are the steps to follow to check the ignition coil: Step 2: Test the resistance. 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. A carbon track on the coil's boot or on the spark plug may be diverting the spark. While ignition coils will generally last for the life of a vehicle, faulty spark plugs or spark plug wires can send irregular voltage surges through the ignition coil, causing the coil to burn out. Since the power circuit is shared by all of the coils on the majority of Coil-On-Plug ignition systems. To test the operation of both the ignition coil and the spark plug, connect the tester between the spark plug boot and the spark plug. Jeep  |   I prefer the multimeter, but have used the test light also with the same results. Now, set your multimeter to test resistance (ohms) by first placing the red lead into the socket which has this symbol: Ω. Turn off the Power. Misc Index  |   Testing the resistance values of the coils using the ohmmeter. You can use a multimeter or a test light for these tests. Step 5: involves testing your secondary circuit of the ignition coil. 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. The HEI Spark Tester (The Best Spark Tester On The Market). Note: We will not be covering distributor-style ignition systems that use just one coil. how do i test a coil on plug with a multimeter on a 2007 toyota camry 2.4L? Wikibuy Review: A Free Tool That Saves You Time and Money, 15 Creative Ways to Save Money That Actually Work. A typical coil-on-plug (COP) ignition coil . Otherwise, it is bad, and you need to change a new one. There is only one that I use, only one that I trust, and the only one I recommend: the HEI spark tester. The car has ECU controlled timing / ignition and there are two coils, each one servicing two cylinders I assume. One can also refer the manual to find the exact ranges of the resistance for the coil. Then, cross the 2 leads of the multimeter over each other and write down the result you get. Turn on your meter and touch the spark plug wire terminals on one of the coils with the meter leads. Remove the cables from each spark plug, then unscrew the first ignition coil carefully and lift it out of the engine block. Do NOT follow this link or you will be banned from the site! 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.. Here are the possible results: The Ground Circuit is tested with the Key On or Off. The coils then convert the energy to a higher voltage, of atleast 50,000 volts, in order to create a spark. Faulty coils can often test fine when cool, ... Set the multimeter to read ohms and test the resistance in the primary and secondary sides of the coil. Alright, let's find out how to test the Triggering Signal in the next page. Even if you find a bad coil, simply replacing it is not the whole repair, because like so many other parts of a vehicle, COP ignition coils don’t really die, they’re murdered. When testing a coil-on-plug (COP) ignition system, one of the first steps is to understand the system operation. Testing the ignition coil and the spark plug Connect the tester between the spark plug boot and the spark plug. The secondary winding takes the electrical charge from the coil to the distributor or to the spark plug. To check the spark plugs for current you will need to have the 12V test light ready and you will need to tap into the spark plugs terminals of your ignition control module. You will find it’s easy to test a solenoid coil follow the rules above. If you're diagnosing a misfire condition. As you may already be aware, this type of ignition system is known as COP coil … One: the Power and Ground Circuits have to be checked for 12 Volts and Ground respectively. Good, now the next step is to verify that the Coil-On-Plug ignition coil is receiving the Triggering Signal. a video will help. Copyright © 2009-2020 Abraham Torres-Arredondo All Rights Reserved. I don't recommend using just any type of spark tester. … Make sure that the engine of your chainsaw is turned off and it … DucatiKiller. A quick way to verify that a coil on plug system is working properly Above; here, I have my digital multimeter set on 200k. Please read the following sections: I Have a Misfire Code(s) or I Have NO Misfire Code(s) before jumping into COP COIL TEST 1.TIP 2: Most of the testing, that you'll be doing, is done with the engine cranking... so be careful and stay alert. That's it! Place one end of your multimeter or test light on the battery positive terminal and with the other end, probe the Ground Circuit. Your email address will not be published. In this step-by-step guide, we will go over how to test whether an ignition coil is good or bad by examining the resistance using a digital multimeter. Step 1: Prepare the multimeter. 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. You got SPARK- If you get a good and continuous spark on the spark tester as the engine was being cranked, then that Coil-On-Plug ignition coil is working fine. Here we use a spark plug coil as an example. Select resistance range setting (I use x100) and connect the ends of the probes into the meter and touch the ends of the probes together. Using a regular spark plug instead of a spark tester for this test is a no no. diagnostics ignition-coil multimeter. ... Reinstall the wires on the terminal and plug the large coil wire into the high-tension terminal. A reading over the specification signals that the ignition coil is open, which would also indicate a need to replace the coil. - Toyota Cars & Trucks question Left, (on the analog meter) simply read Faulty coils can often test fine when cool, so test it before running the car and again after you have driven it. Test for Power (12 Volts) and Ground second. 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. These usually come with a new multimeter. Multimeter Probes. The HEI test plug will put a heavy load on the coil. Two … Use your volt meter to touch the power wire and the trigger wire. The procedure involves using a digital multimeter (set to ohms) to check the resistance of the primary and secondary windings inside the coil. Continuity refers to how much resistance there is in a closed electrical current. I assume the ignition module is bad. Unless you are a professional electrician, a multimeter can be a confusing instrument to use with all the buttons, numbers and symbols. If you want to find out more about how this tool works, I recommend the following article (within this site): The HEI Spark Tester (The Best Spark Tester On The Market).. You'll get one of two results with the spark test. The main purpose of the ignition coil is to step up the low battery voltage to high which is needed to spark plug. Red goes to the positive side of the battery, Black goes to the negative side. Ignition Control Module Testing With A Multimeter ... (DIS) and coil-on-plug (COP) systems come with an ignition coil for every cylinder. 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