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DreamWeaver26

Registered: 04/19/11
Posts: 269
Reply with quote  #1 

Twin 2005 250s. The model and serials are in my signature block. My starboard motor has started storing a lot of code 72s. There are over 100 instances of it. The code is "oil pressure BELOW expected range".

The motor runs fine. I don't get any alarms while running and it consumes the same amount of oil as the port motor. The only reason I am aware of the issue is because I hooked up to my laptop for the heck of it and pulled a report.

I checked around the motor and don't see any oil leaking or broken lines that would indicate an issue. I am wondering if the oil pressure really is low or if the sensor is not working correctly. I checked the indicated oil pressure with the EV Diagnostics. At idle on the motor that is getting the code 72s it shows 0.06 psi for oil pressure. On the other that is not getting code 72s it shows 0.08 psi for oil pressure at idle. A difference of 2 hundredths of a psi. I am considering swapping the oil pressure sensors to see if the problem moves with it but I am not sure what exactly hold them in.

Any suggestions on how to proceed? I don't mean suggestions to take it to a dealer and let them mess with it, I mean troubleshooting steps you have done in the past or personal experience with a similar issue.


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olypopper

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Reply with quote  #2 
Your on the right track with swapping pressure transducers and seeing if the problem is the transducer.  It is most likely the culprit if your engines are consuming the same quantity of oil. 
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jaybird1

Silver Member 8-2011
Registered: 07/24/11
Posts: 340
Reply with quote  #3 
Make sure you use a SS clamp to secure the oil pressure switch to the oil injector. I have found 8 or so that were secured with tie warps allowing the pressure sensor to drop down and even become detached.
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Jaybird1
Basscat P-3
ETEC 200HO #5206267
DreamWeaver26

Registered: 04/19/11
Posts: 269
Reply with quote  #4 
Along those lines, my sensors are secured with tie wraps on both motors.  The book doesn't mention how they should be secured but you can see in the pics that they are held in or on with zip ties.

There does seem to be a bit of play up and down on the sensor on both motors.

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jaybird1

Silver Member 8-2011
Registered: 07/24/11
Posts: 340
Reply with quote  #5 
I've seen them come completely out of the injector and set a code and loose enough to set a code.
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Jaybird1
Basscat P-3
ETEC 200HO #5206267
DreamWeaver26

Registered: 04/19/11
Posts: 269
Reply with quote  #6 
Do these things just pull straight out (the sensors).  I don't see anything holding them but I don't want to break something when I pull them out.
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olypopper

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Reply with quote  #7 
yes
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4 E-Tecs in the barn...........looking for a 5th!
jaybird1

Silver Member 8-2011
Registered: 07/24/11
Posts: 340
Reply with quote  #8 
I don't have one in front of me but don't they have a release similar to the oil lines?
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Jaybird1
Basscat P-3
ETEC 200HO #5206267
DreamWeaver26

Registered: 04/19/11
Posts: 269
Reply with quote  #9 
So I found out that you have to push the release up with a flat blade screwdriver and then pull the sensor down to release it.

Then I found out that they are in the same wiring harness as the pump so I can't just swap sensors without cutting and splicing wires...

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jaybird1

Silver Member 8-2011
Registered: 07/24/11
Posts: 340
Reply with quote  #10 
I will look at mine in the AM and see what it involves. Usually the ones that have been loose or have become disloged I've just reinserted them, secured with a clamp start the motor an run the prime option on EV-DIAG.
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Jaybird1
Basscat P-3
ETEC 200HO #5206267
jaybird1

Silver Member 8-2011
Registered: 07/24/11
Posts: 340
Reply with quote  #11 
The wires in the oil pump/transducer connection are easy to R&R if you have the handy BRP connector tools to release the connection pins. The manual has a good overview of the process.
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Jaybird1
Basscat P-3
ETEC 200HO #5206267
DreamWeaver26

Registered: 04/19/11
Posts: 269
Reply with quote  #12 
According to the book I need: "Secondary Lock Tool P/N 777078" to get part of the connector off, "Primary Lock Tool P/N 777077" to get the connector out, and "Secondary Lock Installer P/N 777079" to install the terminals back into the connector.

I don't have it sitting in front of me.  Do I actually need these tools or can I substitute a small screw driver or needle nose pliers or something like that.

I don't see where I can order just the oil pressure sensor so once I figure out how these connectors come apart I am going to swap the sensors between the motors.  If the problem migrates with the sensors then I am going to have to track down a way to buy a new sensor.  If the problem doesn't migrate then I am going to have to figure out what is going on with the oil pump.

A new oil pump is over $600.

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olypopper

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Reply with quote  #13 
A stiff piece of small wire is what you will need to release the locking tab.
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4 E-Tecs in the barn...........looking for a 5th!
DreamWeaver26

Registered: 04/19/11
Posts: 269
Reply with quote  #14 
Cool.  I have some stainless MIG wire that will likely work.
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seahorse

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Reply with quote  #15 

About 2008 the oil pressure sensor was redesigned to have a deeper groove for more secure fastening and the oil pump number was changed. The newer sensor is available separately but chances are it will not fit correctly in the older pumps

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