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Old 07-06-2009, 11:14 AM
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so you think it isn't detecting the KS at all ? could be ... a scanner in real time would show that.
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Old 07-06-2009, 12:34 PM
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Does this 502 MPI ECU have something like a "Guardian Mode" as does the Merc 496 PCM555 ECU?
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Old 07-06-2009, 02:27 PM
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Originally Posted by stevesxm View Post
so you think it isn't detecting the KS at all ? could be ... a scanner in real time would show that.
My post was assuming that you had "seen" the "not detected" from within the scan tool. If not connected, or bad connection etc... it will tell you somehow either way.

Don't forget that scanners often fool you or just point you in the right direction.

Good luck.
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Old 07-06-2009, 02:52 PM
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from what I understand the ecm looks for a signal from the sensor and it cant get one so it alarms, I dont know if it retards the timing at that point or not, I wasnt in a place to pull out the scan tool. it did start running like crap after the alarm went off so it felt like maybe the timing was retarded.

I will replace the sensor and try and find a connector at a GM dealer, Merc only sells the harness complete.

I bought the boat with the ecm reprogrammed but I agree, I wouldnt mess with it again, not sure what I gained except I can run 5100 or 5150 without hitting the rev limiter.

Thanks
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