Hi all,

I'm looking for some help figuring out why my CEL light came on today. It has come on twice this summer, under very similar conditions.

First, a little background. The truck is an 02 F550 manual transmission. Currently at just over 100k. It has a straight piped exhaust, TS6 chip, red turbo waste gate line removed, EBP valve wired for exhaust brake. Everything else is either original or stock. Does not have any pre turbo exhaust leaks, I don't believe there are any boost leaks (though I haven't used my boost leak detector recently). I have a fuel pressure gauge and EGT gauge.

The first time it happened was in early summer I believe (before I removed the red turbo line, and wired the exhaust brake). I was towing about 17000 lbs (gross about 28k). I had been on the road for almost half hour before it happened so everything was definitely up to temp. Was going up a gradual hill, and noticed the light come on about 3/4 of the way up the hill. No place to pull over so I let up and eased my way to the crest of the hill where I could pull off. Let it idle for a bit and checked for codes with Torque Pro. Nothing. Shut off and restart and the light didn't come back on. Continued on and everything seemed fine so I didn't think much about it again. Until today.

This time was very similar, although it happened after less than 10 minutes of driving (engine and everything still up to temp though). Shorter hill this time, though I was towing a little more, probably grossing about 30k. Same thing with Torque not finding any fault codes, however, now I have Forscan so I tried that and it came up with the attached report. The fuel gauge code is because I have the sender disconnected. The exhaust back pressure code is because I have the EBP valve disconnected from the harness and wired my own way.

I don't know what to check next, or why Torque came up with nothing.

Any thoughts? Thanks

 

I cant open the file.
Torque Pro is no good for code reading, only monitoring.

But since it is related to removing the red turbo line,im just guessing an overboost / defueling code..??

 

DTCs are:
B1201 - Fuel gauge sender open circuit or short circuit to positive
U1262 - SCP Data Link Fault
B1352 - Ignition key in circuit fault
P0238 - Turbo/Super Charger Boost Sensor A Circuit High. Do you have a tune/boost fooler?
P1670 - Electronic Feedback Signal Not Detected.
P0475 - Exhaust pressure control valve malfunction. Is your EBPV deleted?
P0460 - Fuel Level Sensor A Circuit


I have attached the pinpoint tests to perform. Look for the DTC codes and follow the appropriate pinpoint test.

 

I was going to copy and paste the codes, but FTN beat me to it - thanks!

It could be over boost, but the first time it happened was before I removed the red line.

I do not have a boost fooler. What is the boost level that would trigger defueling? I've never seen it above 17 psi when monitoring with Forscan. I wish I had been logging data yesterday .

My EBPV is disconnected at the moment.

I'll let you know the results of the pinpoint tests.

Thanks!

 

About 24psi.

 

I haven't had time to do any diagnostics yet (ever since this whole Covid thing started I've had work coming out my ears), but I did get a new clue today when it happened again.

 

My 02 F250 did this same thing last time I pulled my fifth wheel. Under heavy acceleration the light would come on, but eventually turn off. When I checked codes, 1211 came up. You said you have a fuel pressure gauge...what was your fuel pressure when it happened? Basically the code means injection pressure was higher or lower than what was called for. There is a range up and down before the light sets, something like 200 psi one way and 400 the other...dont remember which is high or low. My local Powerstroke guru told me to check the ICP sensor first...pull the plug and make sure it does not have oil in the connector. His over the phone diag was that code coming up on those conditions with no ill effect was usually the sign of a failing ICP sensor.
Did you notice any loss of power? My truck may have a slight loss of power, but nothing really glaring. I did change my fuel filter this week, but have not really driven the truck since that to see if it made any difference.

 

I didn't happen to look at my fuel pressure gauge at the moment the light came on, but I've watched it when pulling hills other times and it seems to stay steady.

I replaced the ICP sensor December 9th, 2016, about 23000 miles ago. So it's not new, but not original either. I'll check the connector, but I don't expect that to be the problem.

I don't think I had a loss of power, but it usually seems like I don't have enough power going up these hills. I replaced the fuel filters just over 1000 miles ago.

 

Ever since I have chipped mine it does that on heavy pulls when climbing, goes away in a few mins. I have replaced sensors and still the same, new
HPOP, fuel pump, and turbo (for other reasons) still does it. I was told years ago that it is common with chipped trucks. I just ignored it for the last 10
years with no ill results.

 

Ok, thanks for the input.

 

I was logging data the other day when the CEL came on. Methinks maybe my hpop is getting weak.

 

I wouldn't say it's glaringly weak, it's hard to say without a little more info. How loaded were you, how fast were you going, how much throttle were you giving it, what gear were you in? That last bit when the code likely came up looked like it was ******* a bit. If it was pulling heavy up a grade, at those low rpm's and if you gave it the lash without dropping a gear then I could see throwing a code.

 

I get that CEL as well when pulling the RV on 60 HP tow tune of a DP tuned chip.. I usually can pull most stuff, 5-6% grades in 3rd (OD off) and about 2K rpm. RV is 8.2K and truck can be around 8.1K .. light will show up out of not where, i might happen to notice it and then it goes away.. do not notice any power change plus or minus. i ran torque app and no codes it could show.

 

I was at about 18k GCW. Probably going about 50 mph (to start with), in 6th gear, using the accelerator proportionally to maintain speed (or attempt to) up the grade. As I watched FSL on my phone, I could see the ICP slowly getting lower and lower and the IPR duty cycle going up as the truck lost speed going up the hill. I would expect that a strong HPOP would keep the ICP constant going up a grade like that? Or maybe my T6 tow tune is just asking too much from it. I haven't tried it in stock tune.

Torque Pro isn't smart enough to read the code, but FSL had no problem.

 

Glen, I'm working through a similar issue with my Excursion right now, and have a couple of threads on the subject. This one is most pertinent, and links to the first one, when I didn't understand the issue quite as well. I hope they help you, and I'm following your thread in case it helps me.

Mark