The PCM still decides when to fire the ignition coil based on various inputs. A carbon track on the coil's boot or on the spark plug may be diverting the spark. Testing continuity in a wire, current, or fuse is a good idea if you’re installing or repairing any electrical components in an outlet, fuse box, car, or appliance. Otherwise, it is bad, and you need to change a new one. Depending on the ignition system and ignition coil design, the following reference values apply: (observe the manufacturer's specifications) Cylinder ignition coil (transistor ignition system) Primary: 0.5 Ω–2.0 Ω/Secondary: 8.0 kΩ–19.0 kΩ Above; here, I have my digital multimeter set on 200k. ", Home  |   The ignition coils in your vehicle should be located on the right side of the engine, next to the spark plugs. Most people think you can check a small engine's ignition system by removing the spark plug and grounding it while cranking the engine and watching for a spark. And it's just that the Coil-On-Plug ignition coil is bad. Good, this is a good sign. share | improve this question | follow | edited Mar 8 '16 at 23:38. A reading over the specification signals that the ignition coil is open, which would also indicate a need to replace the coil. At this time, you can use a screwdriver and put it near the armature then energize the solenoids. Here are the step by step tests for testing the majority of the Coil-On-Plug ignition systems that have ignition coils with three wires (circuits) in the connector. Clear computer trouble codes. 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. A multimeter is one of the best tools for testing and diagnosing a plug socket. Step 5: involves testing your secondary circuit of the ignition coil. If you suspect that something is wrong with your vehicle’s ignition coil, you can test it with a 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. ... Reinstall the wires on the terminal and plug the large coil wire into the high-tension terminal. IMPORTANT: Before you start, read the following first:TIP 1: The very first thing you have to do, before you start testing with the info in this article, is to find out which cylinder or cylinders are misfiring. 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. Do NOT follow this link or you will be banned from the site! Make sure you continue to wear your leather gloves through this part. 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. Ignition coils retrieve energy from the battery, which is usually at least 12 volts. For the sake of convenience, however, we’ll refer to both designs as ignition coils in this article. Two … Use your volt meter to touch the power wire and the trigger wire. I have a 98 Mazda 626 GF and I'd like to test the ignition coils with a multimeter to see if any of them are starting to fail. Carefully pull the coil off the bracket, and then carefully disconnect the engine and vehicle wires from the coil itself. 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. Faulty coils can often test fine when cool, so test it before running the car and again after you have driven it. Watch the next video for a testing example. Now, set your multimeter to test resistance (ohms) by first placing the red lead into the socket which has this symbol: Ω. Repair the open-circuit problem and retest for spark or retry starting the vehicle. This is why the multimeter test is superior to the shade-tree method of grounding a spark plug to the engine or chassis. 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. £6.00. But there is another simple way to identify a bad coil: Remove the #2 coil and swap it out with another, easily accessible coil. This checks the secondary resistance. Let's continue and find out about testing the other signals that the Coil on Plug ignition coil needs to create spark. Ground respectively question coil on plug testing with multimeter no resistance testing coil on plug with multimeter is. 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