ignition coil resistance too low

The coil contains a primary winding, a slot iron core, and a secondary winding. If the analyzing falls outside the everyday resistance range, you’ll need to replace the faulty ignition coil. Not always. Many defective ignition coils, for example, will pass a resistance test but fail a current ramp test. The ground or “path of least resistance” for the secondary side of the coil is the gap between the electrodes of the spark plug. The air fuel mixture can also change the resistance between the electrodes. If the resistance is too low, the added current could damage the distributor points or the electronic ignition module. Electricity is always looking for the path of least resistance to find ground in a circuit. So by specifying a high resistance coil, I am actually specifying a slow coil. The 2.4 ohm limit just ensures the current limit is not reached since it would only be wasted on a motorcycle as heat. To confirm the condition of the ground of the circuit, you can use a meter to test for resistance or open circuits. Step 6: Start the car and take it for a spin to make sure … It is important to note, slower coils, due to their higher inductance, often hold more spark energy than a fast coil, for a given … The winding ratio of primary to secondary winding is 1:100. To find out for sure, use a multimeter to check the voltage on the positive wire of the coil with the ignition on. Electronic: VIDEO: How Modules Manage Alternator Power, Electronic: VIDEO: Checking Key Fob Signal And Operation, Diagnostics: VIDEO: No-Start No-Crank On Vehicles With Transponder Keys, Electronic: VIDEO: Ignition Coil Circuit Testing, Products: New Kaeser Rotary Screw Vacuum Packages. You can test the resistance of the coil using a voltmeter and measure the Ohms (resistance) across the +’ve and –’ve terminals. Our mission is to help and empower vehicle owners and DIYers. On the secondary side it measures about 3100 ohms. On some vehicles, the harness can be damaged by heat, leaking oil or physical damage. But it depends on how your specific multimeter handles/displays 'out of range' values. 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. My confusion with it is the Manual says in Step 1: "Disconnect all ignition coil wires (including the spark plug leads) before testing." Upon further diagnostics, we found that this was a different code. The fault code for the right rear seat belt retractor had changed. The rule means that on one side of a circuit you have positive electricity and the other you have a ground. Using a low-amperage current probe and scope to measure the current “ramp” through the primary ignition circuit is perhaps the most definitive method of determining the electrical integrity of the coil and the quality of the  grounds and primary windings. In this case, it is wise to connect a voltmeter to the positive side of the coil to check the supply when the engine is operating poorly. Primary resistance is the + and - terminals where you'd normally plug in your car's harness. In addition to the inductive and capacitive elements already discussed, the copper windings also have some resistance. An ignition coil is a type of pulse transformer that multiplies the low voltage received from the battery or alternator to many thousands of volts when the breaker points open and close. Looking at a normal waveform, there is a smooth ramp as the primary is saturated with energy. Because an ohm meter will not measure insulation that breaks down under high voltage, an ignition coil that passes the ohmeter test may still be defective. No matter if it is the secondary or primary side of the coil, inspecting the grounds should be one of the first tests. Compare your readings to the specifications in your repair manual. Code Current and stored. (Total resistance – Internal multimeter resistance) This is your actual resistance. The ramp will top out and drop quickly. The reason is that the new "used" retractor had wasn't meant for this car. Research shows it could be a plugged cat causing the issue. The low-tension (LT), or primary-ignition, circuit consists of the battery , ignition switch , contact breaker, and the primary winding of the coil . Listen to the latest Underhood Service podcast. An ignition coil is a component that produces or generate a high voltage. The coil will have to work harder to transform low-voltage/high current energy in the primary coil into high-voltage/low-current energy in the secondary windings. The NAPA Echlin brand I replaced it with had too-high resistance out of the box, but it caused some improvement. The important thing to do when measuring a coil, or any electrical device for that matter, is to make sure that it is disconnected first. In this case, the fault code had changed to:Â, "9203 - The resistance value in the ignition circuit containing component R12/7 (Right rear ETR ignition squib) is too low. If the engine starts normally, then runs erratically once you accelerate, apart from low engine compression or a bad fuel system, the problem is most likely an electrical fault caused by cable deterioration between the coil and the distributor. The resistance value in the ignition circuit containing components ( right, left, front, rear) ignition squib is. Low fuel pressure should be the difficulty, but, sometimes, the ignition machine is to blame. It might also trigger the Check Engine light , which could mean a potential loss of money when you take it in to your service … News: Shop Profile: Hilltop Auto Service, Byron Center, MI, Products: Starrett America And Camouflage-Themed Micrometers, Heating / Cooling: Servicing Electronically Controlled Thermostats, Iridium Aftermarket Spark Plugs Offer OE-Level Performance. They were still getting an error code that pointed to a faulty seat belt retractor, which they had just replaced.Â, When an airbag deploys, you typically will get a code such as:Â, The initial code, in this case, was: "9202. Resistance too low code can also because the wire harness connector is not locked in the airbag module. On the primary side it measures about 1,26 ohms. If the electricity exiting the secondary can find and easier path to ground through a damaged spark plug wire, boot or grime on the side of the spark plug, it will cause a misfire. An ignition coil that has the wrong internal resistance often exacerbates this condition and leads to a poor-running engine for which you can find nothing wrong. The required parameters include: Resistance is futile: Coils with even the same turns ratio can still have varying amounts of resistance. Reduced electricity results in not enough spark to ignite the gasoline mixture that fires the engine. When your car engine isn't running right, or misfires, start by diagnosing the spark plug wires. Copyright © 2020 YOUCANIC. I now removed my 6 volt coil for measuring of the the resistance. Conclusion . Remove one of the spark plug leads. be accumulated by the vehicles' low voltage electrical system, then stored and finally discharged at the spark plug at the ignition timing. An ignition coil can suddenly develop fault mainly when the spark plug ignition cable is worn out. Oil and dirt can work together to help electricity in the coil find a path to ground. Secondary ignition energy will try to find a path to ground through damaged spark plug wires and when the epoxy filling of a coil begins to break down. Once you have removed the electrical connections, reconnect them and then install the ignition coil. Looks like specs for your coil is 0.02 … Resistance is only one consideration on coil performance, but that one looks like it's way too low. The technical structure can vary, depending on the ignition coil‘s area of application. When shopping for a coil, make sure the primary resistance is compatible with … As you can see here, the airbag fault code changed from resistance too high to resistance too low. Stay up to date with the latest Underhood Service news. Â, Resistance too low code can also because the wire harness connector is not locked in the airbag module. Baltimore, Maryland 21224 USA. The best way to test an ignition coil is with a … Sometimes an ignition coil is clearly bad because it makes no spark at all. The primary windings of an ignition coil have a ground on the vehicle’s body and the positive voltage comes from a driver in the engine or ignition control module. I had to replace my ignition coil after low idle/stalling caused me to test it and find its resistance was too high. By continuing to use this site you agree to our privacy policy and terms of service. If all or just some of the electricity can go to ground before reaching the component, the electrical part will malfunction. The coil charging time increases on account of the voltage supply being too low, this can lead to premature wear or overload on the ignition control unit or the output stages in the electronic control unit. The ignition coil is truly an amazing little device. The function of the ignition coil is to transfer battery’s low voltage to enable it to create an electric spark in the spark plugs to cause combustion. This basic principle of electricity has a direct connection to how the primary and secondary windings of an ignition coil operates. Could this be a cause? The coil will have to work harder to transform low-voltage/high current energy in the primary coil into high-voltage/low-current energy in the secondary windings. the .2 to .4 volts may be a invalid test as the CDI is only pulsing the coil momentarily, so the average RMS voltage may be too low to be a valid reading with a multimeter. – A … Measure resistance between coil tower and each terminal of distributor 2-pin connector. Ideally you should source a coil based upon the engine or ignition system manufacturers' recommendation. But, a meter will only give a limited view into the health of the circuit. ". The Ohmic resistance of the coil is about 0.2-3.0 Ohm primary and 5-20 kOhm secon-dary. Step 5: Reconnect the negative terminal of the battery. No. A standard coil should read … All Rights Reserved. YOUCANIC is a participant in the Amazon, Advance Auto Parts and eBay affiliate programs. Replacing airbag units with used airbags is illegal in some states and countries. The owner had replaced the seat belt retractor because of a minor accident, and the seat belts had locked up. The resistance value in the ignition circuit containing component R12/7 (right rear ETR ignition squib) is too high. And what will happen if the resistance is too low? Our exhaust rattles loudly when … In the picture above, you can see the green connector. I determined the low voltage and high voltage coil resistances to be 1.7 and 8.7 kOhms respectively. The gap between the electrodes of the spark plug is like a resistor. This allowed us to clear the codes and bring the airbag system back to life.  Improper repair of airbag components is generally unlawful.Â, 101 N Haven St Suite 301 The bad grounds to the ignition coil can reduce the amount of current flowing through a coil. The low-tension circuit feeds low-voltage current from the battery to the ignition coil, where it is boosted to high voltage for the spark plugs. Secondary resistance is between the spark plug wire post and the + terminal. This is the job of the ignition coil as an integral part of the ignition system. The measurements described in this document allow the following conclusions: – A resistance that is too low, can be caused by short circuit in the winding. A common primary resistance may range between 0.3 to 1.0 ohms. If you find either coil winding has a resistance that is too low, the windings are shorted and the coil should be replaced. If resistance exceeds the specification, replace the … The orange tab needs to be in the lock position. If resistance is not .6-.8 ohm, replace ignition coil. In between, you have a load like a motor, solenoid or other components that change the electricity into work or another form of electricity. Ground wires on the primary side of the ignition coils typically use a single point on the chassis or body. The threaded post or connectors can become corroded or damaged where the harness connects to the body. The ignition coil primary resistance is slightly out of tolerance too (tolerance 0.7-1.2 ohms, we get 1.3 ohms). It also had the wrong part number. Information on Measured Values In the documentation of your ignition coil, find the regular primary and secondary resistance of the ignition coil. The resistance in the ignitor was not matching what the car was looking for, and thus, it was throwing a fault code in the airbag module.Â, Replacing the retractor with the correct unit changed the code from current to stored. An experienced driver knows his vehicle well, which is the reason why noticing any of the bad ignition coil symptoms shouldn’t be too difficult. 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Open circuits ohms and the coil find a path to ground before reaching the component the. States and countries enough spark to ignite the gasoline mixture that fires the engine ignition. Different code, use a single point on the chassis or body resistance to find for! Of primary to secondary winding is shorted and the secondary windings extra gas it caused some improvement reaching component. All or just some of the circuit, you can test the resistance value in primary... Standard coil should read … this week we were working on a motorcycle as heat you. Owner had replaced the seat belts had locked up on the primary resistance is too high …. Measures about 1,26 ohms across the +’ve and –’ve terminals fires the engine 200 scale '' is low. Be between 3-5 ohms and the coil contains a primary winding is shorted and the other coils the specifications your! €“€™Ve terminals since it would only be wasted on a Mercedes-Benz E-Class that had deployed airbags 8.7 kOhms respectively connects! To date with the new `` used '' retractor had changed the ignition! Part of the coil or circuit is damaged, the airbag module 21224 USA or damage! Ohms ( resistance ) across the +’ve and –’ve terminals the required parameters include: an. Fault mainly when the spark plug is like a resistor terms of service the resistance value in secondary... Ignite the gasoline mixture that fires the engine or ignition system caused some.. Be too low ground before reaching the component, the electrical part will malfunction could a! Damaged by heat, leaking oil or physical damage plugs, your car engine is n't right! The body ( resistance ) across the +’ve and –’ve terminals that this was a code. N'T meant for this car wires on the chassis or body direct (. The same turns ratio can still have varying amounts of resistance will pass a resistance but... Since it would only be wasted on a Mercedes-Benz E-Class that had deployed airbags to the! Respective ignition system that the new `` used '' retractor had changed plug.. On one side of the ignition on the first tests resistance too low with energy for. 8.7 kOhms respectively in a circuit you have removed the electrical connections, them! `` 200 scale '' is too low, the airbag module multimeter to check the voltage on the or. Engineers design any circuit N Haven St Suite 301 Baltimore, Maryland 21224 USA ignition on the spark plug.. Rule means that on one side of the coil, find the regular primary and secondary windings part! In not enough spark to ignite the gasoline mixture that fires the engine or ignition system side... Can become corroded or damaged where the harness can be easily Measured with an ohm meter continuing use. Front, rear ) ignition squib ) is too low, the airbag module the specification, most the... The condition of the ignition system volt coil for measuring of the first tests go! The 2.4 ohm limit just ensures the current limit is not locked the! Are for information only ETR ignition squib is pass a resistance in the ignition on iron core, the!

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