Yanmar 4BY2 Check Engine P0088

[captstu]

Hi, On the way to Florida SW Rendezvous, my Yanmar 4BY2 raised a CHECK ENGINE fault, slowed down and eventually stopped. The fault cleared on restart - and reoccurred with increasing frequency as the trip progressed.

I tried to look for the fault code. Turns out, turning the engine off and on clears the fault code - so my first few tries showed no fault. I've seen this reported here before - eventually, I learned you must look up the fault code before shutting down the engine - hoping the fault wasn't something disastrous.

With the ignition ON.

Press button 5 for five seconds(far right) on your i5601E engine readout. Mine is nearly impossible to see, so I kneel

Screen gives several choices and highlights DIAG CODES

Press button 4 (reading from left)

My engine fault code was: P0081 - The Yanmar manual says, "Rail Pressure Governor Deviation" and "Fuel rail pressure out of range" What it means, "You have a clogged fuel filter" or "insufficient fuel is reaching the fuel pump" or "your lifpump is not working."

I removed the clogged filer - I had an extra inline - and the engine ran fine.

After reading about the Check Engine threads, I thought I'd clarify how I found the diagnostic code. Clearly, the "what it means" is my huor.

 

[Cutwater28GG]

I hate how scary fault codes can be. sometimes its just a simple clogged filter 🙂

 

[mrrlc]

Stuart, Thanks for the tip. The R25 Classic is new to me and I'm sure I'll need to look up error codes someday.
Bob

 

[YukonRon]

Thanks Stu. Good to know.
I've been wondering if there was some place to plug in my OBD II code reader I have for the diesel truck. Looks like I don't have to. Time to pull out the manuals and have a closer look at this.

 

[captstu]

Yanmar sells an adapter to permit a standard plug reader to plug in. I don’t know how to get one.

 

[knotflying]

Good info Stu,

Glad you are making it to the Rendezvous!! We will see you there. Also, on some boats there is a strainer on the end of the pickup in the tank. That has been an issue on some boats in the past. Not sure why there would be a strainer when you have filters. Just seems like a very inconvenient place to go looking for problems.

 

[captstu]

Another Yanmar got towed into the rendezvous with a p0088 error. New primary fuel filter fixed it good as New.


Stuart Bell
Ranger 25: Shearwater
(561) 352-1796