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How to troubleshoot a bad coil on a coil over plug system, using a scope and a low amp probe. There are other ways to isolate the problem. You can move the suspect coil to another cylinder and see if the misfire code moves with the coil. But this test is not always reliable.
Symptoms
- misfire
- hesitation
- check engine light with misfire codes
- low power
Fix
- replace shorted ignition coil
Tests shown
- how to measure ignition coil current from the fuse box
- how to sync the coil patterns to identify specific cylinders
- how to set up a lab scope for ignition coil primary current tests
- what a shorted coil secondary waveform looks like
Tools used
- Lab Scope
- Scan Tool
- Low amp probe
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Playlist
- (Chapter 22) No Spark Troubleshooting, Ignition Coil & Module Testing
• (Chapter 22) No Spark ...
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