smart craft/eng ecm not showing gear pressure qsb5.9

[Byron Biggs]

Twin 2006 qsb 5.9 in SeaRay 40DA, approx 1000 hrs each

My problem:

At sea trial last yr cummins tech using Insite did not see any gear pressure on Stb eng.  All other data normal.

Diesel View (1.0) shows no gear pressure for stb eng.  All other data displayed.

Stuff done:

Cleaned contact at press transducer–no change

Switched press transducer between port and stb eng–still no DV data for stb gear pressure

Measured voltage at press transducer for stb eng and got steady 5 volts DC

My conclusion:

Problem in ECM maybe analog to digital conversion part.

Any suggestions appreciated (am VERY reluctant to switch ecm’s)

 

Topic

[Byron Biggs]

wire #5??

In digging I think I can relate the sensor wire from press transducer to ecn eng harness connector to position 5 (wire # 5).  With tranny in gear it should show something less than 5 volts.  Is there any risk to measuring volt between wire 5 (tranny in gear) and grounding on eng?  Hopefully only takes a wire “wiggle” and we see something.

[Tony Athens]

You are dealing with Mercury Smartcrap electronics made for gas & outboard  engines that was converted to use with Mercury modified electronics on Cummins diesels about 20 yrs ago.. IMO, I would not waste any $$ on the system as in the long run you will never solve the all the gremlins that will continue to show up as time passes……………………..Ton’s of posts and info on this forum and others about what you are dealing with.  Even Cummins has walked away from the “mercury crap”.. The fact that you found a tech willing to even look at it is an accompliishment these days although that was a waste of $$.

 

Long term for the great engine you have  is SAE J1939 ( your base electronics system BEFORE the Mercury conversion)  and or NEMA 2000. 

 

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