If you've been wondering how to test the Coil-on-Plug ignition coils on your Honda Accord or Honda Odyssey (2000, 2001, 2002, 2003 -3.0L V6) to see if one or several are BAD and are causing a misfire... this is the article for you.
As is the custom here at easyautodiagnostics.com, the tests steps are explained in detail and the diagnostic/troubleshooting is accomplish in several easy steps.
This info applies to the 00-03 Honda Accord or Honda Odyssey with the 3.0L 6 cylinder engine. There are other Honda ignition system test articles that you can peruse by clicking here: Index of Honda Ignition Control Module Tests. 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 Honda Accord or Honda Odyssey, 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 Honda Accord (Odyssey), 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:
- Ground Circuit.
- Circuit labeled 3:
- Trigger Signal Circuit.
The above circuit descriptions are shared by all of the six Coil-on-Plug ignition coils on your Honda Accord (or Odyssey). 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.