How to Test a Coil Pack with a Multimeter

How to Test a Coil Pack with a Multimeter

How to Test a Coil Pack with a Multimeter:



A malfunctioning ignition coil can lead to poor engine performance, reduced fuel efficiency, and even engine misfires. Testing your coil pack with a multimeter is a straightforward process that can help you diagnose potential issues and save on costly repairs. In this guide, we'll walk you through the steps to effectively test a coil pack using a multimeter.

Materials Needed: 

  • Multimeter
  • Safety goggles
  • Work gloves
  • Pen and paper (for taking notes)


Step 1: Safety Precautions

Before you start, ensure you're working in a well-ventilated area and have the necessary safety equipment. Put on safety goggles to protect your eyes from any potential sparks or debris.


Step 2: Locate the Coil Pack

The coil pack is a cluster of ignition coils responsible for providing power to the spark plugs. Refer to your vehicle's manual to find the location of the coil pack. It's usually situated near the engine block.


Step 3: Disconnect the Battery

To prevent any electrical mishaps, disconnect the negative terminal of your car battery.


Step 4: Remove the Coil Pack

Carefully remove the coil pack from the engine using the appropriate tools. Take note of the order and position of the wires; you'll need this information later.


Step 5: Set Up the Multimeter

Turn on your multimeter and set it to the resistance (ohms) mode. This is the setting used for testing the continuity of the coil pack.

Step 6: Test the Primary Windings

Locate the primary terminals on the coil pack. These are the two smaller terminals. Place the multimeter probes on these terminals. Note down the resistance reading. A healthy coil pack should typically have a resistance reading between 0.3 and 1.0 ohms. If the reading is significantly higher or lower, it could indicate a problem.


Step 7: Test the Secondary Windings

Move the multimeter probes to the secondary terminals, which are the larger ones. Record the resistance reading. For the secondary windings, a healthy coil pack should have a resistance reading in the range of 6,000 to 30,000 ohms. Again, any readings far outside this range might signal an issue.


Step 8: Inspect for Physical Damage

While you have the coil pack removed, visually inspect it for any signs of physical damage, such as cracks, burn marks, or corrosion. If you notice any of these, it's a strong indicator that the coil pack needs replacement.


Step 9: Reinstall the Coil Pack

Once you've completed the tests and inspections, carefully reinstall the coil pack in the same order and position from which you removed it.


Step 10: Reconnect the Battery

Reconnect the negative terminal of the battery to restore power to the vehicle.



Testing your coil pack with a multimeter is a valuable skill for any car owner or DIY enthusiast. By following these steps, you can quickly identify if your coil pack is the source of your engine troubles. If you find any irregularities during the testing process, it's advisable to consult a professional mechanic for further advice and potential replacement.

Regular maintenance and timely replacement of faulty components like the coil pack can go a long way in ensuring your vehicle runs smoothly and efficiently for years to come.

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