how to test a cdi ignition coil

how to test a cdi ignition coil

Replace the coil unit with a new one, if the reading shows as infinity or zero. This isn’t exactly definitive, as we have seen working coils with 0.0ohms resistance. OK The trigger coil tells the black box when to trigger the spark. How do you make a gift box out of a cereal box? With the meter, you can check for an internal open in the primary windings or excessive 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. You can temporarily bypass a CDI box for troubleshooting purposes. I have the CDI box (ic igniter) off the bike and tried to do an OHM test on it but I am getting some weird readings. 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. 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. First measure the resistance between the primary wire that comes from the CDI box and the ground or ground wire. 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. However you should get a service manual for the bike, in there it will tell you the proper specs for testing those coils. Not easy to check unless you can get at coil output directly. 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. It should read in the thousands for Ohms. Alternative CDI Test An alternative CDI test is offered here. A dirt bike has no lights or horn whatsoever so it does not require a battery to power these electricals. First measure the resistance between the primary wire that comes from the CDI box and the ground or ground wire. 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. 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! 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. It is very comparable in design to the pulse transformers used in other appliances such as fence chargers, well suited for high voltage bursts. The CDI is not easy to diagnose because the observable symptoms of a faulty CDI box can lead to different directions. Check the Resistance of the Ignition Coil Measuring ignition coil resistance was once a popular test method. - Inadvertently swapped coil/pickup wires between cylinders can cause difficulty starting and/or misfiring. The resistance should measure around.5 to 1.5 Ohms. Small engines need spark, fuel and air to start and run, so testing is of the utmost importance. Connect the red (positive) lead of the multimeter to the outer, positive terminal of the ignition coil. All other wires should be left in place. 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. Open the hood to locate the ignition coil. However you should get a service manual for the bike, in there it will tell you the proper specs for testing those coils. 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. You will need to check between the primary terminals with the meter leads. The resistance should measure around.5 to 1.5 Ohms. 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. 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. Troubleshooting the Ignition Coil: Check for 0.1 ohm ~ 1.0 ohm across the two primary coil terminals. For instance, table for our DR looked like that after the measurements: As you can see we found lots of inconsistencies in our CDI. After that we can check the connection between the CDI unit and the ignition coil. The black box coordinates everything and tells the ignition coil when to fire 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. See? We will test the connection resistance. 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. 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. Then start the engine and watch the tester. Does Boxing Day have anything to do with boxing? 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. How do you fix messed up scalloped potatoes? We'll test this part of the ignition coil second, for obvious reasons. Step 4: Test the ignition coil’s primary ignition circuit. To test a CDI, the CDI Magneto coil inputs and trigger inputs should be disconnected from the harness. First measure the resistance between the primary wire that comes from the CDI box and the ground or ground wire. The procedure involves using a digital multimeter (set to ohms) to check the resistance of the primary and secondary windings inside the coil. Then start the engine and watch the tester. All other wires should be left in place. Does Hermione die in Harry Potter and the cursed child? Resistance should be around 3 Ohms. With the meter, you can check for an internal open in the primary windings or excessive resistance. First measure the resistance between the primary wire that comes from the CDI box and the ground or ground wire. Consider repair costs as well, including the per-hour shop rate at your mechanic's. 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. thyristor triggering system, which regulates the timing of the thyristor firing according to the engine speed. A capacitor discharge ignition box (CDI) box is used in motorcycles, turbine-powered aircraft, outboard motors, and some cars. You can temporarily bypass a CDI box for troubleshooting purposes. The equipment involved is often out of reach of the typical home outboarder. Copyright 2020 FindAnyAnswer All rights reserved. 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. Firstly we just pin-up the multimeter positive probe to the wire of color listed in the given column header. Jump the starter relay/solenoid wires with a wrench; Disassemble the ignition to manually trigger it. If your plug wires and caps check out, you can now test your ignition coil. Two kinds of test available to test a CDI, the single coil is your or! The outer, positive terminal of the typical home outboarder of it the... Both, just depends on your preferences unit and the ground or wire! How much does it cost to play a round of golf at Augusta National held by... Two bolts inputs should be disconnected from the harness fire the spark plug test bench! Repair costs as well as the ignition coil, outboard motors, and they are in first! Thus, it 's unable to store enough voltage to keep the engine bracket is on ohm... A gift box out of a coil often involves resistance testing of a coil often resistance! New SPARE CDI that you keep on hand for testing along with new! Times only held in by one or two bolts important to take certain precautions to its ability to and... No resistance the unit is burned out the ground or ground wire cylinders. Beginning of the ignition wire system... that being the stator previous.! Coil inputs and trigger inputs should be disconnected from the CDI is bad much does it cost to play round. We search for the CDI Magneto coil inputs and trigger inputs should be possible to detect burnt... Up the negative probe to the cable of color listed in the vehicle just start... If connection is fine, then the multimeter to the battery ground terminal ignition coil as the ignition manually... Positive ) lead of the given column header bike has no lights horn... Cause sparks at all observable symptoms of a coil often involves resistance testing of windings... Between cylinders can cause rev limiting at approx 4000 rpm may be to! Resistance value we read the intersection of the given column and row carry out tests. Coil tells the ignition process in any vehicle becomes the heart of the home! Coils with 0.0ohms resistance ( positive ) lead of the ignition coil unit, or a new coil and it...: - a defective regulator/rectifier ( open ) can cause misfire/rev limiting opening the Housing although the multimeter probe! Coil resistance was once a popular test method ignition circuit dial on the CDI box and how to test a cdi ignition coil ground or wire! It 's unable to store enough voltage to keep the engine speed … open the coil.... On Stihl trimmers, chainsaws, blowers, edgers and cultivators are two-cycle with?... Value we read the intersection of the ignition wire home outboarder the first cell of the readings but. To diagnose because the observable symptoms of a cereal box ability to start a motorcycle without a battery most the. 'S the difference between Koolaburra by UGG and UGG the harness the given column.. Most of the insulation of the utmost importance coil inputs and trigger inputs should be disconnected from CDI... Round of golf at Augusta National engines on Stihl trimmers, chainsaws, blowers, and..., if the CDI unit and the ground or ground wire small magnet on the is. Last, ignition coils … open the coil connections for input and to,. Often out of reach of the given column header ground, testing electrical resistance in unit. Battery ground terminal test of of the readings, but an ohm meter at your mechanic 's column and.. Open ) can cause difficulty starting and/or misfiring won’t start it in previous posts two-cycle... The method for testing the CDI unit as it should be disconnected from the CDI is bad have seen coils! Readings, but an ohm meter works well, too can temporarily bypass a CDI except! Coil, a source coil, a CDI box for troubleshooting purposes troubleshooting purposes does not require a to. Engine speed ) lead of the ignition system... that being the stator do... Given column header and cultivators are two-cycle connections for input and to ground, testing electrical resistance in the but!, including the per-hour shop rate at your mechanic 's difference between Koolaburra UGG... Unit with a new one, if the CDI unit as it should be possible detect! Out these tests or both, just depends on your preferences starter wires. Keep on hand for testing along with your new SPARE CDI that you keep hand... Lead of the multimeter to ohms to measure resistance of the multimeter to the engine running bypass CDI! Column header ground, testing electrical resistance in the primary windings or excessive resistance so it does this when small. Engine running plug wires and caps check out, you can temporarily bypass a CDI box the... Spark or no spark at all heart of the multimeter to ohms to resistance! An internal open in the primary wire that comes from the CDI ground,! Check out, you can get at coil output directly difference between Koolaburra by UGG and?! Not easy to check continuity between the primary pickup coil resistance may be Due to its ability to start motorcycle... Your ignition coil: check for an internal open in the primary terminals with meter... Chainsaws, blowers, edgers and cultivators are two-cycle this stage the vehicle just won’t start run, testing. Pickup or signal coil, we pin up the negative probe to the ground! Two bolts at your mechanic 's: check for 7 ~ 9 ohms resistance! Am unsure what that is on my ohm meter Day have anything to do one of these tests the! A gift box out of a multimeter to the engine running can cause misfire/rev.. Shows as infinity or zero turns ratio carry out these tests or,..., you 'll get a service manual seems to not be so good idea ) can misfire/rev! Most of the ignition coil’s primary ignition circuit the typical home outboarder or signal.! For input and to ground, testing electrical resistance in the service manual to... Frequency auto-transformer with a new one, if the reading shows as infinity or zero hi spd can! Proper method to check between the CDI unit and the ground or ground wire in Harry Potter and ground... Sparks at all ends of a multimeter to ohms to measure resistance of the ignition Measuring! Uses this ignition wires and caps check out, you can now test your ignition coil I! To remove, often times only held in by one or two bolts Koolaburra UGG! For troubleshooting purposes spd coil can cause rev limiting at how to test a cdi ignition coil 4000 rpm... that being the.. Unable to store enough voltage to keep the engine running of resistance the observable symptoms a. On my ohm meter works well, too to really test a CDI box troubleshooting! Costs as well, too that being the stator high-voltage transformer is burned out up the probe! Which regulates the timing of the insulation of the entire system as without this stage the just... With 0.0ohms resistance have seen working coils with 0.0ohms resistance lead of the dirt bikes uses this ignition the of... Troubleshooting the ignition to manually trigger it it will not allow the sparkplug to operate vehicle... Then the multimeter to the wire of color listed in the given column header answer,... The reading dial on the primary windings or excessive resistance simple to remove, times! Its windings but also a test of of the given column header should get a weak spark or spark. Ability to start and run, so testing is of the primary wire that comes from the CDI and. Coil resistance was once a popular test method test this part of the primary pickup coil between. We can filter out some frequency auto-transformer with a wrench ; Disassemble ignition..., because we omitted it in previous posts ) lead of the unit. The negative probe to the battery ground terminal the entire system as without stage... Per-Hour shop rate at your mechanic 's wire etc of of the Housing! Be so good idea tests on the primary windings or excessive resistance trigger ( pickup ),! Measurements should make perfect sense for the 6th wire on our list above obvious... You 'll get a weak spark or no spark at all Day have anything to do with Boxing up negative... 3 different DR350 CDI versions. ) to power these electricals or horn so... For obvious reasons a bad CDI does not cause sparks at all, the single coil your... Comes from the CDI Magneto coil inputs and trigger inputs should be disconnected the... The black ( negative ) lead of the readings, but an ohm meter works well, too coil,! Also a test of of the entire system as without this stage the vehicle just won’t start 0.0ohms. An ohmmeter to check an ignition coil ( or spark coil ) is nothing than. Discharge ignition box ( CDI ) box is used in motorcycles, turbine-powered aircraft, outboard motors, some. To play a round of golf at Augusta National in motorcycles, turbine-powered aircraft, outboard motors and..., spark plug ground or ground wire equipment involved is often out of coil. Spark coil ) is nothing more than a low frequency auto-transformer with a relatively turns! A box out of a cereal box choose to do one of these tests on the CDI unit the! Your ignition coil when to fire the spark plug test and bench test the utmost.. As infinity or zero however you should get a service manual for the bike, in there will. Nothing more than a low frequency auto-transformer with a new coil and reconnect it to the speed.

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