Hi there, unfortunately there isn't much (any actually) info to find online to share regarding the latest technology coming out of Mercruiser for their PCM 09 Catalyst operation system like you have.
Since you have a vessel view system that tells you basic info like what came up and that eventually your warranty may expire sometime, One thing I'd suggest looking into is using your engine serial number, call a Mercruiser dealer parts department and try getting "ALL" the latest service manuals "Part Numbers" that would obtain to your engine model as there may be a few of them out there then try searching the part numbers online such as EBay for the lowest costs available if desired..."Sometimes" used manuals can be found for lower costs.
^ Also ask for one that would list the PCM-09 fault codes as these codes are completely different then the older 555 and MEFI type ECM's of years past.
To help understand what you're seeing as a fault code that is written in two sections on your screen, below is a copy and paste of the summary.
MerCruiser introduced the PCM-09 ECM module on their 2009 model year engine's equipped with catalytic converters. These engines are initially intended for the California market and are designed to meet OBD-M emission requirements.
The PCM-09 module is an entirely new ECM type for MerCruiser and bears little resemblance both physically and functionally to the PCM-555 / ECM-555 modules used on their non-catalyst engines.
The PCM-09, manufactured by Visteon Corp., supports OBD-M compliant diagnostics and requires use of the #94027 scan tool CAN network adapter as shown in the photo above.
Please refer to page 34 in this manual for additional details associated with the diagnostics available on OBD-M compliant engine control modules.
Page 34,
OBD-M compliant ECMs
The MerCruiser scan tool supports marine stern drive and inboard engines that comply with the 2008 California mandated OBD-M diagnostic specification. The scan tool displays both live data and fault codes when connected to OBD-M compliant systems.
OBD-M live data The live data displayed by the scan tool is dependent upon the engine manufacturer's engine control system configuration. The OBD-M specification defines a set of common engine parameters that must be made available to service technicians using a scan tool if the those parameters apply to the engine being diagnosed.
OBD-M Fault Codes OBD-M compliant engines use a system which displays fault codes in two parts, a Suspect Parameter Number (SPN) and a Fault Mode Identifier (FMI). An explanation of this system is detailed in the MEFI-5 section of this manual on page 19.
Page 19,
Mefi-5 ECM modules introduce a new system of fault codes that differs significantly from prior generations of MEFI modules. The new system breaks faults down into two parts, a Suspect Parameter Number (SPN) and a Fault Mode Identifier (FMI). This method of fault code delivery conforms to the OBD-M emissions standards being phased in for stern drive and inboard gasoline marine engines.
SPN (Suspect Parameter Number): This number provides a general description of the engine component, sub-system or process that is suspected of having an operational error.
FMI (Fault Mode Identifier): This number reflects the type or method of failure associated with the SPN described above. In other words it describes how the engine component, sub-system or process has failed.
On the scan tool's display screen the Suspect Parameter Number is preceded by the letters SPN and the Fault Mode Identifier is preceded by the letters FM as shown below:
The scan tool will display text descriptions of all SPN and FMI values, scrolling the descriptions across the lower line of the scan tool's display screen. Due to the large number of SPN values a listing of all possible faults cannot be included in this manual. Please refer to the scan tool's display screen for all SPN and FMI descriptions.
Note: In some cases additional information, such as the number of fault occurrences will be shown after the scan tool displays the SPN and FMI text descriptions.
Connecting to GM MEFI-5 and PCM-09 systems using Rinda Scan Tool CAN Network Adapter Part # 94027.
1) Locate the engine’s 6 pin CAN diagnostic connector. This connector may also be referred to as the OBD-M connector (On-Board Diagnostics-Marine). The location of this connector is specified in the engine manufacturer’s service manual. Please note that the connector may have a protective cap attached to it.
One other suggestion I would give a try is to post your question along with your engine serial number over on Offshore Only and see if a certain Mercruiser tech member that posts often over there has any other guidance for you at all...He may have a list to help but not totally sure though....Post the question in the following sub-forum that's linked,
https://www.offshoreonly.com/forums/general-q-20/ ....
https://www.offshoreonly.com/forums/newthread.php?do=newthread&f=20
AllDodg's suggestion of buying one sensor and trying it in all the positions is pretty good as that might be a lower cost idea should you be out of warranty or to far to drive to a dealer, etc. time wise for your situation should the problem be just a sensor issue and nothing else actually causing the issue.
Let us know what you come up with please & good luck to you.
