How To Test A Coil Pack?

A coil pack is a group of ignition coils that use the energy from the car’s battery to generate sparks that fire each cylinder one at a time. During the late 1990s, coil packs started to take the role of the less effective distributor in vehicles.

Testing a coil pack with a multimeter:

Finding the ignition coil pack is the crucial first step because different vehicle models all have varied locations for their coil packs on the car. You can find a coil pack; test it with a multimeter, then reinstall the ignition coil pack using the step-by-step instructions provided below.

Finding the Coil Pack:

  • To locate a coil pack, first determine the battery or plug position in your engine.
  • You’ll see that the plugs are connected by a wire of the same color, and all you need to do is obey it.
  • When you reach the end of such wires, you will notice a single area where all four, six, or eight of the wires connect, depending on how many cylinders the engine has in total. The so-called ignition coil pack is basically that area where they overlap.
  • If you’re still having trouble finding your ignition coil pack, your best bet is to look up your specific model on the internet or in your owner’s manual so you can look up where your engine’s coil pack is located.

Coil’s Pack Testing:

  • The first step in testing the coil pack would be to disconnect all of the spark plug’s initial connections, as well as the engine’s ignition coils.
  • The next step requires the use of a multimeter after all connections have been removed. You must set the Multimeter to a 10-ohms reading section since the ignition coils’ resistance is a problem.
  • The next step is to attach one of the Multimeter’s ports to the primary coil’s center connector on the primary ignition coil pack. As soon as you finish, the Multimeter ought to display a value lower than 2 ohms. If this is the case, the primary coil output is successful.
  • You must now determine the resistance of the secondary ignition coil pack, which you may do by positioning one port at one coil and then another port at another coil while setting the ohmmeter to the 20K (20,000) ohms area. The resistance of an automobile ignition coil pack must range from 6,000 to 30,000 ohms.

Coil pack’s reinstalling:

How To Test A Coil Pack?
  • The ignition coil pack must first be moved into the engine deck, and then the three or four bolts must be tightened using the appropriate size socket or ratchet.
  • The plug wire must then be reconnected to each port on the ignition coil pack of the vehicle. The name and number will determine how this link is made.
  • The battery cable should then be connected to the primary coil port, which may be distinguished from plug ports.
  • Connecting the battery’s negative port, which was unplugged at the beginning of this entire process, is the last step.

Testing a Coil Pack with Voltage Meter:

A malfunctioning coil could cause sporadic firing, a weak spark, or total cylinder destruction. Due to their sensitivity to heat, coils might develop intermittent issues if one or more of their internal components deteriorate. Once the internal winding weakens and breaks, the issue cannot be fixed. However, a voltmeter can be used to test a coil pack in your car.

Steps of testing Coil Pack:

The steps of testing a coil pack with a voltage meter are given below;

  • Open the hood after parking your automobile in a secure location.
  • Follow the ignition wires from the spark plugs, which are attached to the coil pack, to find it in your engine. The coil pack may be positioned on the side or even the back of an engine, depending on the model of your specific car.
  • To ensure proper installation, unplug the wires of the spark plug from the coil and identify them if necessary.
  • Using a wrench, ratchet, and socket if required, unplug the coil pack’s electrical connection and take it out of the engine. If your coil pack is attached to the back of an engine, you can reach it from under the engine by raising the front of the car and securely supporting it on two jack supports.
  • Decide on a range of 20000 ohms for your ohmmeter.  Turn on your meter, then use the meter leads to touching the spark plug wire terminals on one of the coils. Depending on your specific model, you can get a value between 5000 and 15000 ohms. The secondary resistance is examined in this.
  • For every coil in the pack assembly, repeat steps 6 and 7, then compare your readings of the resistance to the guidelines provided in your vehicle’s service manual. Change the coil and coils as necessary if your results are incorrect.


Another thing to keep in mind is to always connect each ignition coil pack port to the appropriate wire. To avoid any mistakes, label each port with a number or a specific sign.

Additionally, I want to suggest that you practice caution before beginning your work. A deviation from the essential safety regulations may result in an undesirable circumstance. To get the most out of testing an ignition coil pack, make sure to read and adhere to these sets of instructions. Make a second pass to ensure you didn’t forget any steps.


How can an ignition coil be tested at home?

The primary and secondary connections in ignition coils need to be checked. To obtain a primary circuit reading, attach the multimeter to the ignition coil terminal’s negative and positive. The ignition coil needs to be replaced if the multimeter displays a reading of zero ohms.

What should the coil’s ohms be?

The typical or usual ohm range for clearomizers and vaping seems to be between 2.4 and 2.8. When looking for replacing coils, this is definitely the most common ohm range, with 2.5 being the most popular choice. The most consistent intensity for your vaporizer is usually provided at this standard setting.

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