To all those that helped on the forum - Thank you for your valuable help. This boat got relegated to the back of the line however it is now fixed. So what was it? The initial troubleshooting found a bad 5v reference ground (this turned out to be the only problem) HOWEVER at the time the mechanic...
Thanks again Muc,
You have generously offered up some very valuable information, thank you again! Will be doing some more work on this boat hopefully in a week or so. I've noted all your points and will be sure to offer up more detail on the forum soon.
No I hadn't any idea about the lack of...
Good question....will find out and get back to you on that, but yes I do believe our scan software showed it at 5. But should double check that under both conditions.
Thank you Muc,
The ignition bypass I refer to is where the ckp signal goes direct to the icm during initial crank and the icm directly fires the primary coil circuit, then as the ecm sees the ckp it takes over signaling the icm to trigger spark appropriately.
We are seeing the DTC's mentioned...
Thank you guys for your replies, the only persistent codes during scan were trim voltage too high (the leg trim sender has its wires disconnected) and buzzer circuit open. engine SN is 4012227089. The strange thing is the ECM logic in this case which allows the ignition trigger output to the ICM...
Wondering if anyone has an idea and can help with a Volvo Penta gas inboard 5.7 Gi-J multiport FI that refuses to start due to lack of continuous spark? Scanned it and scoped it. Symptoms are during cranking only three or four spark events occur initially and then none. However will run rough...
