Grider Pirate

I'm also pulling a P0237 code, but with all the other electrical funnies going on, I doubt the MAP sensor is actually bad.
This truck was running fine, then it got a 'Water in fuel" light. Shortly thereafter, the oil pressure gauge started dropping to zero, then coming back up. Check gauges came on as the oil pressure went stupid.
This happened once before, on trip my wife was taking. I ended up driving out in my '01 and reseating every connector under the hood I could find and reach, several times.
So far, I've cleaned the battery terminals, reseated all the bulkhead connectors, and every other connector I could reach. I cleared the codes using my reader, but the 'Water in Fuel' comes on as soon as I start the truck. (there is NO water in the fuel). This time, the problem doesn't seem to want to go away. Any ideas?
Oh, and one thing I HAVEN'T done, but should have, is check all the relays and fuses.

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Grider Pirate, USAF RET
'99 2WD, Auto trans, 165,000 miles, DSS, New VP44, new LP, cheap DIY low fuel press. warning light.
'01 4WD, Dyna mat throughout interior, Alpine Stereo with remote amp, '03 track bar, Bilsteins, '08 (17") Wheels, 1 Ton chevy wheel cylinders, FASS, ATS trans, 3.74 gears, BHAF, 3 piece exhaust manifold, Banks power elbow, 4" exhaust, Banks High Ram intake, Stage 1.5 F-1 injectors.
'95 BMW R100GSPD
'88 BMW R100RS
'78 Grob Speed Astir II
'74 Bonny
'73 BMW R75/5

johnh

you need to check the wif sensor which is on the fuel filter. probably needs to be replaced.
"the WIF sensor is located on the side of the fuel filter housing" from my manual......

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01 3500 ho 2WD;4 inch exhaust bully dog stage 3 inj edge comp(removed hybrid hx 35/40 8/25/04) dyno 419.2 hp 891.8.torque w/stage 2`s on a dyno jet 6/25/03 ,htb2 turbo installed 8/25/04, not a dually any more,conversion done in 04... added home designed propane march 07 (to improve mileage) new vp 44 from industrial injection 3/july/07 181000 miles, removed stage 3 injectors ,reinstalled stage 2 to try to control EGT's better

Grider Pirate

I'll check that tomorrow evening (can't do it tonight, working).
In the first post, I was unclear. ALL of the symptoms (CEL, Oil pressure zeroing, Check Gauges, etc.) return withing a few minutes of engine start, but the WIF shows up immediately.

Grider Pirate

Dodge didn't make this an easy troubleshoot. It could have been, but the FSM wiring section is less 'technician friendly' than I expected. No actual 'schematics'. Lots of pages to scan to put togeher a reasonably accurate picture. The K104 circuit was common to all the sensor errors I was getting. It turns out that I spent one heck of a lot of time trying to figure out why my K104 circuit (which is shown in the '99 FSM as 'B+' [+12vdc]) didn't have any 'B+' sort of voltage. I tracked it back to pin 11 of the ECM, where there was also NO B+. Hmmm. On a whim, I looked up some wiring diagrams elsehwere on the WWW, where, low and behold, the same circuit is shown as 'Sensor Ground'. That checked out with a meter, and I quickly found where the wires for the WIF had chafed together, shorting. The big clue was that I still had a WIF indication when the sensor was disconnected.
In case anybody cares: the WIF sensor has no active components. It's basically to wires sticking into the filter canister. Diesel fuel is a pretty good insulator, and water isn't. Aside from leaking, I don't think this particular sensor can go bad.
Anyhow, the '99 is back on the road despite less than perfect tech data.

pind

Grider

As long as you did a less than perfect job of the repair, to go along with the less than perfect technical info.... its ALL good.

I frequently get to read service manuals for japanese machines, that have been translated into about 12 other languages, including swahili, before being translated to engrish. As it stands, I have a whole new appreciation for what common items can be called, as opposed to what they do.

Good job on finding the WIF wiring. Jobs like that can be a widowmaker.

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01 2500 Q/C 4x4, factory order HO w/5spd, 4 wheel discs, Pacbrake, 285 Cooper STT's on 058 Eagle Alloys. Ultra 5th wheel hitch. Glacier Diesel GFS-392 LP
01 F550 XLT 4x4, Jokestroke, 6 speed, heila knuckleboom, boxes and deck, low mount 5th wheel. No mods, no power, no fuel economy, kinda like a ford.... HAHA
Never judge someone until you've walked a mile in their shoes. Then, when you do judge them, you're a mile away... and you have their shoes

Grider Pirate

I have to admit to being spoiled. The Tech Orders I've used for the last 30+ years working on electronics (USAF stuff) have been excellent, and highly standardized. That said, the FSM for the '99 is really good, with the exception of the wiring diagrams (or lack thereof).