Limp mode

[Scarecrow]

Was a nice guy yesterday and gave a friend a jump start, wasn't watching when he hooked up and now I've got a water in fuel light and a check engine light. Scanned it and have a p0237 and a P1693 code, it will not let me clear them. Ideas?

 

Please tell me he didn't fry my ECM.

 

Mark

[W-T]

Mark, the P1693 is only an indication of a "companion" code. It just means there is another code within the system and actually it's not a real concern. it's just the way our system works and it's redundant for it to tell us we have a code. I too see it when I hit 30 PSI of boost, and the P1693 shows up along with the code indicating "over boost". I always clear this prior to taking my vehicle into the service facility for the bi-annual Smog inspection here in California.  

 

Now, your P0237 is a MAP sensor code, Manifold Absolute Pressure, this could mean high or low boost via your turbo in run condition.

 

I'll assume your info regarding "water in Fuel" came up just after your good deed in helping out was completed?

 

I can not see how allowing someone to apply jumper cables as a courtesy to another driver to cause your MAP sensor code and water in fuel to occur immediately after doing so.

 

I'll go out on a limb here and say, NO on ECM failure.

 

You stated that you can't clear the code(s) and I'm assuming this is once you clear them and start the engine for a test drive, the error codes reappear?

 

Are you able to monitor boost? Is it acting normal? Does the truck feel normal on acceleration? Are you seeing lots of smoke on hard acceleration?

 

Sorry for the trouble but, the old adage of, "No good deed goes unpunished" may hold true here.

 

Allow us a little more of your observations as we move forward with this puzzle.

 

Here is a scolding...never allow anyone under the hood of your CTD

 

Cheers,

Billy

 

 

[Scarecrow]

No, I can't build boost, 5-7 psi max. on a side note, my oil pressure is now 20 psi lower ( on the factory gauge) there is no acceleration. I'm fixen to go nuclear and unhook the batteries and reboot the system.

 

Mark

[W-T]

OK...from this info I would advise searching for a boost leak. The MAP code is valid and with a stock truck you should be able to see at least 20 PSI of boost. With only 5-7 PSI max the sluggish response would indicate a very large leak in your system.

 

You needn't spend time rebooting the ECM/system at the present time. The main focus is a mechanical error allowing pressurized air to escape the closed system.

 

With a leak that large I'd begin with a squirt bottle filled with water and dish soap and look for bubbles at all mating joints of the boost system. Your waste-gate should be fully closed at idle and I am not sure of how you're set up but, do you have performance enhancements where you've J-hooked your waste gate to allow additional boost levels beyond 20 PSI? If so, I'd attempt to see if there is any extraneous aspects to the control arm of the waste-gate that would interfere with full mechanical closure of the gate itself. This is a messy and difficult chore to observe due to the location of the waste-gate actuation arm but, you must assure yourself that the gate can fully close. A waste-gate open just a small amount will not allow boost to be built and set a MAP code quickly.

 

I acknowledge your observation of the oil pressure gauge...let us first correct the poor engine performance aspect and get this beast back to normal operational levels. Not being there with you I might guess the idle aspects of this CTD could be suffering and perhaps this leak is large enough to curtail correct idle RPM and contribute to low oil pressure indication. 

 

BTW...do you still have a "water in fuel" indication?

 

Billy

 

 

[Scarecrow]

No major boost leaks I can see, the major point here I think is my inability to clear the codes. The p0237 code maybe indicating short to ground somewhere, either the sensor  or the wiring. Disconnected power and let it sit for  3 hrs, codes still come up with ignition on, not running. No power when running, low throttle response, feels like it's definitely de-fueling. 

 

Mark

[dripley]

If the ecm is seeing little to no bost it will not fuel. I have two map sensors fail for what ever the reason. I would think the map sensor is bad but it is an exspensive part to just throw at it. I did however find a cheap a while back it resides in truck now 10 months or so later. I bought from Fridayparts.com I believe.

You can see where it comes from and when i bought them they were $15 apiece. Delivery is not fast. Had the same 237 code. If you know some one that has a spare to try I would do it just to test. Mine died with the same  237 code. But the boost reading on mine were 0.

 

So 

WT could be right on the boost leak, but that should not be hard find. And it is pretty much free to check.

 

If I am not mistaken the MAP and oil pressure sensor share the signal wiring also on seperate lead from the other sensors.

Edited July 25, 2021 by dripley

[Scarecrow]

You nailed it Drip. After doing a interweb search with "water in fuel", "low oil pressure", and "cummins code P0237" it actually sent me to a thread on this site from 2018. Same symptoms, not the same conclusion, but close enough. After looking at Mike's wiring diagrams I got out the multimeter and started checking voltage. Turns out the MAP sensor was shorted to ground.

 

So now the question is, did the jump start cause this, or just a coincidence?

 

Mark

 

 

 

[dripley]

3 hours ago, Scarecrow said:

So now the question is, did the jump start cause this, or just a coincidence?

 

That my friend you may never know. 

[Dieselfuture]

15 minutes ago, dripley said:

That my friend you may never know. 

It seems to hunt us here with these anomalies