This is a very simple test that'll let you know if a Coil-On-Plug ignition coil or several of them on your Suzuki Verona have fried and are causing a Misfire Condition. The test itself is accomplished in several easy steps.
Below you're gonna' find some very useful information that will help you with your tests, so take a look at the following paragraphs.
This info applies to the 2004, 2005 Suzuki Verona with the 2.5L L6 cylinder engine. If you need to read a primer on how to test Coil-On-Plug Ignition Coils that are not covered by this article, read: Testing And Troubleshooting 3 Wire COP Ignition Coils.
Common Symptoms Of A Bad Coil-On-Plug Ignition Coil
This is not the most definitive list on the subject, but does cover the majority of symptoms I've seen on this type of ignition system:
- Misfire Codes that light up the check engine light (CEL) on your instrument cluster.
- Engine Misfire that DOES NOT light up the check engine light (CEL).
- Smell of unburned gasoline coming out of the tailpipe.
- Rotten egg smell coming out of the tailpipe. This is due to the unburned gasoline from the misfiring cylinder over loading the catalytic converter.
- Really bad gas mileage.
- Lack of power as you accelerate the vehicle down the road.
What Tools Do I Need?
A scan tool (Automotive Diagnostics Scanner) is not needed. Even if you suspect a Misfire, you don't need a scan tool to find out which cylinder is the one that is misfiring. You can perform the cylinder balance test yourself on your Suzuki Verona, Test 1 will help you with this. You'll need:
- An HEI Spark Tester.
- Battery Jump Start Cables.
- A Digital Multimeter.
- This multimeter must be able to read Hertz Frequency.
- A helper.
- You'll need someone to help you crank the engine while you perform the tests in the engine compartment.
- A repair manual.
- For whatever remove and replace info you'll need that is not covered by this article.
Circuit Descriptions Of The C-O-P Ignition Coil Connector
OK, to test the Coil-On-Plug ignition coils on your Suzuki Verona, you need to know what each wire (circuit) does in the connector. Here are the Circuit descriptions:
- Circuit labeled 1:
- Power (12 V) Circuit.
- Circuit labeled 2:
- Trigger Signal Circuit.
- Circuit labeled 3:
- Ground Circuit.
The above circuit descriptions are shared by all of the six Coil-On-Plug ignition coils on your Suzuki Verona. So, whether you're testing the number 1 cylinder ignition coil or the number 4 cylinder Ignition Coil (or whichever Ignition Coil), the above info applies.
To test these circuits, it's not necessary to unplug the ignition coil's connector therefore, I recommend testing for each signal with the connector connected. Also, using a wire-piercing probe is the most effective and easy way of getting to the signal. If you need to see what this tool looks like, click here: Wire Piercing Probe.