I recently had a Vauxhall Astra none runner, I don't profess to be an expert understanding the scope patterns. I carried out a starter cranking test after having completed a code read producing the codes P0351, P0352, P0353 and P0354, all relating to the ignition primary coil circuits.
Battery voltage was available at the coils positive terminal and a good ground connection was also available. The voltage at the coils positive and negative connections showed about 10.8V during engine cranking.
The primary ignition trace shown did not seem to be seen when scoping it using the Vantage Pro, later due to my lack of experience using the scope I learned that the scope did record the trace, which now appears to have been a glitch on screen and then gone, but after loading to shop stream and using the movie viewer I found the trace.
If the ECM switching circuit was working correctly I would have thought that the ignition primary wave form should have been observed on the scope at all times the engine was cranking?
The ignition primary trace shown has what I refer to as ash at the part of the trace, which if that was the secondary trace I would of been asking what is happening when the spark plug is arcing during the two mill seconds burn time?
Is it the scope settings that cause this ash effect on the trace or is there another valid reason for it?
Thanks
David
Battery voltage was available at the coils positive terminal and a good ground connection was also available. The voltage at the coils positive and negative connections showed about 10.8V during engine cranking.
The primary ignition trace shown did not seem to be seen when scoping it using the Vantage Pro, later due to my lack of experience using the scope I learned that the scope did record the trace, which now appears to have been a glitch on screen and then gone, but after loading to shop stream and using the movie viewer I found the trace.
If the ECM switching circuit was working correctly I would have thought that the ignition primary wave form should have been observed on the scope at all times the engine was cranking?
The ignition primary trace shown has what I refer to as ash at the part of the trace, which if that was the secondary trace I would of been asking what is happening when the spark plug is arcing during the two mill seconds burn time?
Is it the scope settings that cause this ash effect on the trace or is there another valid reason for it?
Thanks
David
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