Offshoreonly.com - Mercruiser Fault Codes??

Offshoreonly.com (https://www.offshoreonly.com/forums/)

- General Q & A (https://www.offshoreonly.com/forums/general-q-20/)

- - Mercruiser Fault Codes?? (https://www.offshoreonly.com/forums/general-q/312114-mercruiser-fault-codes.html)

Quote:

Originally Posted by BUP (Post 4650196)

depends if you have those or not and if you have DTS as well ??

^^^^^^^ Related to the post above # 50 ^^^^^^^

Quote:

Originally Posted by BUP (Post 4663791)

he reported it cured it for now but in the spring will know more with more run times as how I took his post.. most of the time something is causing the o2 to possible fail -- not the o2 just failing because. Yes that can happen as well. but the odds are something is causing the o2 fail. Read post 23 and 33 of mine...... also connections / harnesses as well can be in the mix

I’ll check the poppet and make sure the temp sensors for water and the plenum temp sensor aren’t gummed up also, I read false readings can make the engine think it’s always “cold” and run rich also, thus fowling the 02. Thanks again

RICH CONDITIONS

Yes if the poppet is not working correctly allows to much water thru at idle and tad above. Also a bad O2 sensor or one that is not reporting correctly.

a T stat not working correctly also

the coolant temp sensor

a cold running engine makes for rich conditions

also the MAP sensor can make rich running engine.

Also ignition components and spark plugs can make for rich conditions -- misfires and or weak or bad ign. parts.

fuel injectors leaking or stuck open - also incorrect signals for injector pulse width - that can even be voltage related.

An issue with the o2 surely can

I thought you scanned the engine for the codes - using diacom

Quote:

Originally Posted by BUP (Post 4663797)

the shop has it on theirs, I have a tech mate pro and waiting on the proper can connector so I can look for myself. And yes it is running rich I I now see it can be a multitude of causes, I’ll start from getting a base reading on a fake lake and see what codes pop up after I swap out the stbd post and pre sensors. Also going to do plugs regardless, and give the cooling system a thorough inspection, I don’t recall check valves on my last boat but it’s something to look for this time when I get home this weekend

Got my can adapter today and showed the following:
322 stbd cylinder bank fuel trim too lean
02controlITermLowStbd

129 tps sensors failed to adapt at engine shutdown
Tps2 ecm NoAdapt

321 stbd cylinder bank fuel too rich
02controlITermLowPort

I think I got the tps because I turned the ignition to “on” for a bit without the battery perko switched over and got a fault for low voltage “failed startup”. This code didn’t pop up till after that.

PCM calibration id MY10p5ACC_8M0099133_004

i have 2 o2 sensors brand new from my last boat that I will be putting in regardless and probably 2 more because I found a good deal on some new ones. I noticed in the rinda the motor is named “starboard”. This is why I am probably getting confused as to which side the o2 sensor may have failed. Is it the motor “backward” due to being a v drive, only caught this because all the sensors on the actual port side of the boat say stb sensor and vice versa.

Told you as a real SCAN of the engine you were not going to SEE Fault ID # 48 and # 50 nor ever will. I was 98 percent sure of that one in my post above. Like I said I thought you already scanned it with your diacom. YOU HAVE NOW.

the scan / faults all read if one is / facing the front of the engine. The engine and ECM has no idea how the engine is facing - heck even if it was upside down - that still applies the same, -- heck I scan engines on engine stands and spin that engine stand 180 and all over the place, nothing changes. Just saying

Last time out in Oct, boat was fine. Fired her up on the trailer today, and have an active fault.

2007 525efi, port active fault: "trim ckt lo"

any ideas?
thx!

Quote:

Originally Posted by imartin (Post 4665917)

Last time out in Oct, boat was fine. Fired her up on the trailer today, and have an active fault.

2007 525efi, port active fault: "trim ckt lo"

any ideas?
thx!

Bump

you have to post your engine serial NUMBER to get correct info.

All codes are related to ones set up .

For Ghost codes they are related to not having that sensor . and or connection / connected / app in the set up so it defaults to a code. This is why one needs to know their set up and engine serial number, This helps knowing if its a real code or a ghost code persay..

Also any OEM Merc dealer could look at this for you as well.

Wish I was closer to you BUP, would have you handle everything. My buddy speaks highly of your work. For the engine with related code, its OM956832. Thanks.