Coil on plug tester

Types of Coil-on-Plug Testers

A coil-on-plug tester is a device used to test vehicles with coil-on-plug (COP) ignition systems. The tester connects to the vehicle's ignition coil and allows the technician to check the spark plug's condition and the ignition coil's performance. There are different types of coil-on-plug testers, including:

• Handheld Coil-on-Plug Testers

  It is a basic coil-on-plug tester connected directly to the vehicle's diagnostic port. The device has a screen that shows different error codes and real-time data. Mechanics can use handheld testers to analyze the COP system and diagnose ignition-related issues. Some even allow users to update data and have a battery backup, making them portable and versatile.

• Digital Coil-on-Plug Testers

  These are advanced coil-on-plug testers that allow for more in-depth analysis and diagnostics of the COP system. They are connected between the ignition coil and the spark plug, enabling the technician to monitor live data, including voltage, current, and resistance. Some can store data and have a USB connection for easy transfer. As a result, it allows for thorough troubleshooting and diagnostic capabilities.

• Oscilloscope-based Coil-on-Plug Testers

  These are the most advanced coil-on-plug testers used to analyze the ignition signal's waveform. It provides real-time monitoring and in-depth analysis of the ignition system's performance. The tester connects to the vehicle's diagnostic port and the oscilloscope, allowing for detailed analysis of the ignition signal. This enables technicians to identify even the most subtle issues with the ignition system. It is especially useful for diagnosing complex ignition-related issues.

Specification & Maintenance of Coil-on-plug Tester

The following are some general specifications to consider when purchasing a coil-on-plug tester.

• Voltage Output

  Different coil-on-plug testers have various voltage outputs. One may have an output of 0-12V RMS or 0-20V RMS. The voltage output shows the level of the signal they send to the engine's control unit. It also indicates the strength of the spark it generates.

• Current Output

  Like voltage output, different coil-on-plug testers have various current outputs. Some may have an output of 0-7A peak or 0-15A peak. The current output indicates the strength of the signal it sends to the engine's control unit. It also shows the strength of the spark it generates.

• Frequency Range

  The frequency range indicates the number of times the coil-on-plug tester can complete a cycle in a second. For instance, some testers may have a frequency range of 0-100Hz or 0-200Hz. This means they can send low or high-frequency signals to the engine's control unit.

• Waveform Type

  Some testers generate square waves. Others may produce sine waves or a combination of both. The waveform type determines the signal the tester sends to the engine's control unit. It also determines the strength of the spark it generates.

• Display

  Some coil-on-plug testers come with a display, while others do not. If it has a display, it will show important information such as the voltage output, frequency range, and current output.

• Power Supply

  Some testers get their power from the car's battery. Others have their own internal batteries or get power from the mains. If it gets its power from the mains, it will have a power cord.

• Size and Weight

  Coil-on-plug testers come in various sizes and weights. Those with a smaller and lighter design are portable and easier to use.

• Included Accessories

  Some testers may come with additional accessories such as carrying cases, cables, connectors, and adapters. These accessories can enhance the tester's functionality and make it more convenient to use.

The following are some general maintenance tips for coil-on-plug testers.

• Follow the manufacturer's instructions on how to use and maintain the tester.
• Keep the tester clean to prevent dirt and dust from affecting its performance.
• Regularly check the cables and connectors for wear and replace them if necessary.
• Store the tester in a dry and safe place away from direct sunlight and moisture.
• Regularly charge the battery (if it has one) and replace it when it reaches the end of its life.

How to choose a coil-on-plug tester

Before buying a coil-on-plug ignition tester, buyers need to understand their needs. Here are some factors to consider:

• Voltage Output

  Coil-on-plug testers have different voltage outputs. Choose a tester with a voltage output that matches the needs of the target market's vehicle.

• Compatibility

  Choose a coil-on-plug tester that is compatible with most vehicle engines. It should be compatible with both domestic and foreign vehicles.

• Display

  The tester has an output voltage that can be displayed on a digital screen or gauge. Choose a tester with a good display that is easy to read.

• Quality

  Choose a coil-on-plug tester made of quality materials. It should have a strong and durable construction. This ensures it can stand rough use in workshops or garages.

• Price

  Set a budget before buying a coil-on-plug tester. There are many options in the market, so remember to compare the features and price to get a suitable tester within the budget.

How to DIY and replace coil-on-plug tester

Here is a step-by-step guide on how to DIY and replace a coil-on-plug tester:

• Safety Precautions

  Before starting the process, ensure to read the user manual and understand the instructions. Also, wear safety gear such as safety glasses and gloves.

• Gather the necessary tools

  COIL-ON-PLUG TESTERS are very important. Choose a coil-on-plug tester that suits your needs. Other tools required include screwdrivers, pliers, ratchet and socket set, torque wrench, and a multimeter.

• Locate the ignition coils

  Identify the location of the ignition coils by referring to the vehicle's service manual. The manual will provide detailed information on the exact location of the ignition coils.

• Remove the ignition coils

  Use a wrench to remove the bolts securing the ignition coils. After that, gently pull the ignition coils out of the engine. Be careful not to damage the surrounding components while removing the coils.

• Connect the coil-on-plug tester

  Plug the tester's connectors into the ignition coil's electrical connector. Also, ensure to connect the ground lead of the tester to a suitable ground point on the engine or chassis.

• Turn on the vehicle

  Start the vehicle's engine and observe the readings on the coil-on-plug tester. Follow the manufacturer's instructions and see if the voltage is within the specified range.

• Perform a comparison test

  If the vehicle has multiple ignition coils, perform a comparison test. Swap the tester to another coil and compare the readings. This helps identify whether the problem lies with a specific coil or is present in multiple coils.

• Analyze the results

  If the tester shows low or unstable readings, indicating a faulty ignition coil, if the readings are consistent but within the specified range, the ignition coil is in good condition.

• Reinstall the ignition coils

  Once the test is complete, reinstall the ignition coils. Connect the electrical connectors and tighten the bolts securely.

• Disconnect the coil-on-plug tester

  After reinstalling the ignition coils, disconnect the coil-on-plug tester. Ensure to remove it carefully to avoid damaging the connectors or the tester itself.

Q and A

Q1: How do you use a coil-on plug tester?

A1: Using a coil-on plug tester is simple. First, set the vehicle’s ignition system. Then, connect the tester to the first coil and plug. After that, follow the instructions on the tester’s display to check the ignition coil’s health. Finally, unplug the tester and check the results.

Q2: Can a COP tester be used on all vehicles?

A2: No, not all vehicles can use a coil-on plug (COP) tester. Some older vehicles have a different ignition system called distributor-based. It is not as efficient as COP. However, most modern vehicles are compatible with COP. If unsure, check the vehicle’s manual or ask a mechanic.

Q3: What should be checked before using a COP tester?

A3: Before using a COP tester, check the vehicle’s battery. It should have enough power for the test. Also, ensure the COP tester is fully charged and ready to use. Finally, look at the vehicle’s ignition system to ensure compatibility with COP.

Q4: What do the results of a COP tester mean?

A4: The results of a coil-on plug (COP) tester tell how well the ignition coils are working. If the test is good, it means the coils are in good shape. They can make sparks as needed. A bad or weak result shows that one or more coils have problems. They may not give strong sparks. It can cause engine misfires or poor performance.

Q5: Is it safe to use a COP tester?

A5: Yes, it is safe to use a coil-on plug tester. But follow the instructions carefully. Be careful when working with the vehicle’s electrical system. If unsure, ask a professional to use the COP tester.