Sometimes, a bad CDI does not cause sparks at all. Turn the reading dial on the multimeter to ohms to measure resistance of the primary pickup coil. Testing of any outboard coil to see if it's good is relatively simple if you following the procedures below. Summing up, as a result, if everything looks fine so far and you checked the ignition coil, the power source coil, the pick up coils, the ignition switch and kill switch and the neutral switch, then I think it’s safe to move on to the real CDI unit test.. Why is the movie bird box called bird box? Sure, in the manual it is mentioned that the test should be carried with a special Suzuki multimeter, but seriously we don’t know now why the multimeter from Suzuki should make any difference in comparison to the standard multimeter in case of an ordinary resistance measurement? - Inadvertently swapped coil/pickup wires between cylinders can cause difficulty starting and/or misfiring. We will check the CDI unit. Then, equally, we pin up the negative probe to the cable of color listed in the first cell of the table row. The trigger coil tells the black box when to trigger the spark. (Note: there are 3 different DR350  CDI versions.). The CDI unit test. You know if the CDI is bad by process of elimination. This means that there is no resistance the unit is burned out. A CDI ignition starts by generating a charge and storing it up before sending it out to the spark plug in order to ignite the engine. If it's bad, you'll get a weak spark or no spark at all. A capacitor discharge ignition box (CDI) box is used in motorcycles, turbine-powered aircraft, outboard motors, and some cars. We hope that with the post series about DR electrical system testing you grew fond of the resistance measurements, because today we will preform more than 70 of them! A capacitor discharge ignition box (CDI) box is used in motorcycles, turbine-powered aircraft, outboard motors, and some cars. Does Boxing Day have anything to do with boxing? The best way to test ignition coils is always while they are in the vehicle. A faulty ignition coil will disable any two-cycle engine from starting because it will not allow the sparkplug to operate. Connect the red (positive) lead of the multimeter to the outer, positive terminal of the ignition coil. But before you do any test, it is important to take certain precautions. Easy. This power passes through a capacitor and is transferred to an ignition coil that helps boost the power by acting as a transformer and allowing the energy pass through it instead of catching any of it. The black box coordinates everything and tells the ignition coil when to fire the spark plug. The equipment involved is often out of reach of the typical home outboarder. Open the Coil Housing. Ignition Coil -- The function of the ignition coil is to step up the voltage of the discharged current from the CDI, and send it to the spark plug. Step 4: Test the ignition coil’s primary ignition circuit. What the Coil Does . However we are lucky as dear Mr Suzuki included a quite easy to get around table, where all the test we have to make and their expected results are listed. Replace the coil unit with a new one, if the reading shows as infinity or zero. Privacy Policy, Pinning up the multimeter to the battery ground terminal, CDI unit testing table from the service manual, No spark issue: Testing the ignition coil, it is lightning the neutral gear indicator light, so we can ignore this as it’s just a light, neutral switch connection, so it must be short to the ground if we want to run the bike, side foot cable, so we can ignore it, the bike can be started with the side foot set out anyway, it connects to the tachometer, so again we don’t have to care much if the engine start is what interests us, it’s a ignition coil connection and it is this cable which is a path for the impulse from the discharging capacitor we’ve mentioned earlier, so it has to be connected to the CDI properly, the first cable leading to the first coil of the crankshaft sensor, the second cable leading to the first coil of the crankshaft sensor, the first cable connecting the CDI unit to the power source coil, the second cable connecting the CDI unit to the power source coil, the first cable leading to the second coil of the crankshaft sensor, the second cable leading to the second coil of the crankshaft sensor, thyristor, which allows for capacitor discharge. You will need to check between the primary terminals with the meter leads. Therefore first we connect our multimeter probe to the battery ground terminal. The ignition process in any vehicle becomes the heart of the entire system as without this stage the vehicle just won’t start. The book shows an infinity symbol for some of the readings, but I am unsure what that is on my ohm meter. Will a motorcycle start with a bad Rectifier? CDI, Ignition Coil or Magneto Stator. All other wires should be left in place. If we plug in a new CDI and still no spark, then we will plug in a new ignition coil and retest, still no spark, we finally will replace the stator magneto in the left side DRY engine cover. The transformer typically has only a dozen or so turns on the primary but many thousands on the secondary. You can temporarily bypass a CDI box for troubleshooting purposes. Out of curiosity we’ve also measured the resistance in the new (used) CDI unit and to our surprise it turned out… the measurements were completely the same as in the old CDI! How to test an ignition coil Testing the ignition coil and the spark plug Connect the tester between the spark plug boot and the spark plug. Anyway, as always, we have a video for you from this test party, If you continue to use this site we will assume that you are happy with it. Firstly we just pin-up the multimeter positive probe to the wire of color listed in the given column header. OK It should read in the thousands for Ohms. All other wires should be left in place. Take the good unit, or a new coil and reconnect it to the engine bracket. How do you make a box out of a cereal box? How do you fix messed up scalloped potatoes? First measure the resistance between the primary wire that comes from the CDI box and the ground or ground wire. The Best Method to Test Ignition Coils. Here is where you plug in your NEW SPARE CDI that you keep on hand for testing along with your new cheap spark plug. Use your multimeter to check for resistance. When troubleshooting a no spark condition....start at the beginning of the ignition system...that being the stator. (it feeds the CDI) Set meter to AC and crank engine...should get 60+ volts...although I have seen them put out as low as 30 and still run. As with most types of vehicular maintenance, you'll want to begin the test with the vehicle in park and with the engine off. To test a CDI, the CDI Magneto coil inputs and trigger inputs should be disconnected from the harness. The function of the ignition coil is to multiply the voltage of the power supplied from the CDI, and to send the multiplied power to the spark plug. Not easy to check unless you can get at coil output directly. To test a CDI, the CDI Magneto coil inputs and trigger inputs should be disconnected from the harness. (The Greek letter omega denotes ohms.) In this post we discuss the circuit for a simple, universal capacitive discharge ignition circuit or a CDI circuit using a standard ignition coil and a solid state SCR based circuit. Caution: High resistance may be due to high resistance HT lead to plug! You can temporarily bypass a CDI box for troubleshooting purposes. After that we search for the 6th wire on our list above. That coil is the one that generates a small amount of electricity that is sent to the CDI box to tell the ignition coil to fire. No way to really test a CDI...except try a different one. The resistance should measure around.5 to 1.5 Ohms. Firstly let’s start with the CDI ground test, because we omitted it in previous posts. - A defective hi spd coil can cause rev limiting at approx 4000 rpm. Switch on the ignition. There are two kinds of test available to test your ignition coil, and they are, spark plug test and bench test. The CDI (Capacitor Discharge Ignition) is an electronic ignition system, which mainly consists of three components: Besides those, there also few other components in the DR350S CDI, which are responsible for engine cutoff depending on the state of the ignition, the state of the neutral gear and the state of the side foot. How to test an ignition coil Testing the ignition coil and the spark plug Connect the tester between the spark plug boot and the spark plug. Thus, it's unable to store enough voltage to keep the engine running. Then start the engine and watch the tester. Why are shadow boxes called shadow boxes? Ignition coils have two circuits that need to be … From the looks of it, the single coil is your pickup or signal coil. With the meter, you can check for an internal open in the primary windings or excessive resistance. Alternative CDI Test An alternative CDI test is offered here. Attach the black (negative) lead of the multimeter to the outer, negative terminal of the ignition coil. First measure the resistance between the primary wire that comes from the CDI box and the ground or ground wire. CDI ignition: Due to its ability to start a motorcycle without a battery most of the dirt bikes uses this ignition. A dirt bike has no lights or horn whatsoever so it does not require a battery to power these electricals. It's impractical to uncover the coil and examine the wire; fortunately, there's an easier way to find a break -- a continuity test. Secondary Coil: Check for 7 ~ 9 ohms of resistance. Complete testing of a coil often involves resistance testing of its windings but also a test of of the insulation of the coil wires. First, turn … thyristor triggering system, which regulates the timing of the thyristor firing according to the engine speed. What is software testing explain black box and white box testing on detail with example? Consider repair costs as well, including the per-hour shop rate at your mechanic's. If your plug wires and caps check out, you can now test your ignition coil. How do you make a gift box out of a cereal box? That coil is the one that generates a small amount of electricity that is sent to the CDI box to tell the ignition coil to fire. The equipment involved is often out of reach of the typical home outboarder. Check the red wire on the stator. You will need to check between the primary terminals with the meter leads. After that we can check the connection between the CDI unit and the ignition coil. First measure the resistance between the primary wire that comes from the CDI box and the ground or ground wire. Jump the starter relay/solenoid wires with a wrench; Disassemble the ignition to manually trigger it. As you can see those are lots of connections! Summing up, as a result, if everything looks fine so far and you checked the ignition coil, the power source coil, the pick up coils, the ignition switch and kill switch and the neutral switch, then I think it’s safe to move on to the real CDI unit test.. Do not carry out these tests on the CDi (amplifier) unit plug. It is very comparable in design to the pulse transformers used in other appliances such as fence chargers, well suited for high voltage bursts. So we had a reason to think the CDI is broken and so we bought a new one from France for about 80$ (130$ with delivery :/). Attach the ends of a multimeter to the coil connections for input and to ground, testing electrical resistance in the unit. In the case of the H2 for example, this will be the Green and white from the mag coils, and the three whites from the magneto. Although manufactured to last, ignition coils … We will test the connection resistance. :/ However, fortunately, we can filter out some. If connection is fine, then the multimeter should show 0 Ω. Furthermore, how much is a CDI box? Click to see full answer Thereof, how do I know if my CDI box is bad? The ignition coil consists of a single wire wound hundreds of times around a core, and any break that occurs in the wire renders the coil inoperable. Hence here we have to measure resistance between the white with blue tracer cable (in the 3-pin socket of the CDI) and the connector hanging from the coil’s casing: Additionally we can check if the ignition coils shorts to the ground. Complete testing of a coil often involves resistance testing of its windings but also a test of of the insulation of the coil wires. Use an ohmmeter to check continuity between the coil ground as well as the ignition wire. You'll want to start by checking for signs of bad ignition coils, and then follow up that diagnosis by testing the coils with a multimeter. Does Hermione die in Harry Potter and the cursed child? However we have to be careful to not mess up the probe order, because for some connections there are different results for the opposite pin-up of probes. Although the multimeter measurements should make perfect sense for the CDI unit as it should be possible to detect a burnt wire etc. It does this when a small magnet on the flywheel passes the trigger. Notes: - A defective regulator/rectifier (open) can cause misfire/rev limiting. What is white box testing and list the types of white box testing? Use your multimeter to check for resistance. trigger (pickup) coil, a source coil, a CDI unit and an ignition coil. Let’s check it wire by wire: The 8th, 9th, 10th, 11th, 12th and 13th connection from this list has to work properly if we want to ride our poor DR. Psst… In order to make finding wires easier, here’s a little cheat sheet – mapping of wires to sockets: 4-pin square socket: connections 1-2-3-4, 3-pin single-row socket: 5-6-7, 4-pin square socket: 8-9-12-13, single pins: 10, 11. I changed out the ignition coil, I did an ohm test on the pick up coil and it is within specs according to the clymer manual. For instance, table for our DR looked like that after the measurements: As you can see we found lots of inconsistencies in our CDI. Test 1 - No Spark - Check to operation of the ignition and kill switches Check the kill switch, ignition switch and the associated wiring by carrying out continuity (resistance) checks on the loom 3 way plug. The proper method to check an ignition coil is using an oscilloscope, but an ohm meter works well, too. We’ve almost bought a cheaper one, but in the nick of time we acknowledged that the cheaper one has only connection to the one crankshaft sensor coil. Small engines need spark, fuel and air to start and run, so testing is of the utmost importance. This isn’t exactly definitive, as we have seen working coils with 0.0ohms resistance. You can choose to do one of these tests or both, just depends on your preferences. How Ignition System in Vehicles Work. Turn the reading dial on the multimeter to ohms to measure resistance of the primary pickup coil. Finally to check the proper resistance value we read the intersection of the given column and row. An ignition coil (or spark coil) is nothing more than a low frequency auto-transformer with a relatively high turns ratio. However you should get a service manual for the bike, in there it will tell you the proper specs for testing those coils. Access the wiring for your ignition coils by opening the housing. Here is where you plug in your NEW SPARE CDI that you keep on hand for testing along with your new cheap spark plug. Troubleshooting the Ignition Coil: Check for 0.1 ohm ~ 1.0 ohm across the two primary coil terminals. You can check the coil though. See? How much does it cost to play a round of golf at Augusta National? It converts the power from your car's 12-volt battery into the thousand or so volts that the spark plugs need in order to fire and then ignite the engine's air-fuel mixture. To test the coil's secondary winding, attach the test probes to the outer 12-volt pole on the coil and the center pole (where the main wire goes to the distributor). The CDI unit test. Ignition coils take energy from the battery (usually 12 volts) and convert it to a high enough voltage (50,000 volts or more) to create a spark. We were daunted, but in despair we gave it a try and connected the new block to our dead DR. We were really relieved that we didn’t throw money down the drain! What's the difference between Koolaburra by UGG and UGG? Engines on Stihl trimmers, chainsaws, blowers, edgers and cultivators are two-cycle. Connect the red (positive) lead of the multimeter to the outer, positive terminal of the ignition coil. The source coil produces the power. 3) Ignition coil,disconnect from CDI if possible,measure resistance to ground of primary,should be a few ohms,measure secondary resistance to ground, should be a few thousand ohms. The CDI is not easy to diagnose because the observable symptoms of a faulty CDI box can lead to different directions. The proper method to check an ignition coil is using an oscilloscope, but an ohm meter works well, too. To summarize the method for testing the CDI unit described in the service manual seems to not be so good idea. Test the ignition coil’s primary ignition circuit. Summing up, as a result, if everything looks fine so far and you checked the ignition coil, the power source coil, the pick up coils, the ignition switch and kill switch and the neutral switch, then I think it’s safe to move on to the real CDI unit test. Troubleshooting: Primary Coil: Check for 0.1 ohm ~ 1.0 ohm across the two primary coil terminals. Then start the engine and watch the tester. 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