2002 Volkswagen Jetta GLS 2.0L No Start Ignition Circuit

Car problem question:

This 2002 VW Jetta GLS 2.0L has a no start and when tested has no spark but has injector pulse. When I got it scanned, an RPM code came out which I thought require a crank sensor replacement. The RPM signal could be seen at the scanner live data stream but still no spark after the crank sensor was replaced. Do I need to replace the cam sensor or the PCM?

ATS Adviser:

Since you have injection pulse, this shows the ignition circuit is OK from the PCM side. However, you need to check what is coming out of the PCM to the ignition coil circuit signal terminals or check the integrity of the coils. You can measure each coil with a DVOM or compare each spark color intensity (must be solid blue not pale orange).


You are not going to believe it but when I tested each coil with a spark tester, only 1 out of 4 has a bright blue color. The rest has orange (weak) color. Replacing all coils fixed the problem. Thanks for your advise. THAT was a quick fix!

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