LOST JEEPS :: View topic - Code P1104 Mass Air Flow Sensor Circuit Ground

Well, here's the thing. I don't want that tranny pooping out at 70,001 miles because I didn't flash and change the shift points or whatnot. But if you still think "ain't broke, don't fix it", I do usually follow that. I'm just new to diesels, and I want this beauty to last a long time. Turns out we bought a limited production collectors item!

-Paul N

Well, having tranny problems after the flash is not a good endorsement!

However, I was hoping that a flash would help the shift points and lower rpms at highway speed. I drive at 75 on the highways and its almost exactly 2200rpms. Seems fairly high compared to what other people are getting, and my mileage isn't great (low 20's, calcualted the old way) on either Biodiesel or Dino-diesel...

Has anyone gotten lower RPMs and better milage after the flashes? Or a suggestion on how to get low RPMs at 70+mph?

Paul N
2005 CRM stock.
usually running 100% Biodiesel
12,500 miles

Author:	BiodieselJeep.com [ Sun Jun 11, 2006 10:24 am ]
Post subject:	Code P1104 Mass Air Flow Sensor Circuit Ground
How's that for a new code? MIL came on over Memorial Day after filling at a truck stop. I run 100% Biodiesel, so I thought it just was registering the change in fuel (besides, I had had similar light go on after filling in that area before turning to Biodiesel). But it didn't go away and I popped the code. P1104? Had to look it up on a OBD specialty site. "P1104 Mass Air Flow Sensor Circuit Ground", a Jeep specific code according to the site. A bad wiring job? Anbody else ever have this code? I hate electrics, so I think I'm taking it in unless anyone thinks it is a simple loose wire i can fix... Thanks for the input Paul N http://www.biodieseljeep.com[/url]

Author:	oldnavy [ Sun Jun 11, 2006 11:00 am ]
Post subject:
Paul our CRD did the same shortly after we bought it, <500 miles and dealer had to order a new sensor. Nice thing is it doesn't cause a drivability problem and is a quick fix. Matter of fact after a few starts the CEL even went off but it held the code. I haven't had a problem since.

Author:	BiodieselJeep.com [ Sun Jun 11, 2006 12:16 pm ]
Post subject:
Thank, Oldnavy! Any suggestions on which TSB's I should ask/force/scream for? Its been a year since I bought it, and this is the first time it will go to the dealer. -Paul N

Author:	oldnavy [ Sun Jun 11, 2006 12:22 pm ]
Post subject:
If you are not having any issues, I would not mess with a good thing. Like someone once said, "If it ain't broke, don't fix it".

Author:	BiodieselJeep.com [ Sun Jun 11, 2006 12:27 pm ]
Post subject:
Well, here's the thing. I don't want that tranny pooping out at 70,001 miles because I didn't flash and change the shift points or whatnot. But if you still think "ain't broke, don't fix it", I do usually follow that. I'm just new to diesels, and I want this beauty to last a long time. Turns out we bought a limited production collectors item! -Paul N

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Author:	oldnavy [ Sun Jun 11, 2006 12:40 pm ]
Post subject:
BiodieselJeep.com wrote: Well, here's the thing. I don't want that tranny pooping out at 70,001 miles because I didn't flash and change the shift points or whatnot. But if you still think "ain't broke, don't fix it", I do usually follow that. I'm just new to diesels, and I want this beauty to last a long time. Turns out we bought a limited production collectors item! -Paul N Well you can have the tranny flashed, but it it's not bucking or jerking or presenting some other drivability problem, then I would not mess with a good thing but that is just me. I will assume it is not one of the trannys that had the improper filter installed, am I correct?

Author:	Guest [ Sun Jun 11, 2006 1:24 pm ]
Post subject:
BiodieselJeep.com wrote: Well, here's the thing. I don't want that tranny pooping out at 70,001 miles because I didn't flash and change the shift points or whatnot. But if you still think "ain't broke, don't fix it", I do usually follow that. I'm just new to diesels, and I want this beauty to last a long time. Turns out we bought a limited production collectors item! -Paul N The folks here having tranny problems will never see 36k miles before getting a new one, or more... If your running good, leave it alone. Just make sure you have the transmission filters and fluid changed per the maintenance schedule in the user manual.

Author:	RFCRD [ Sun Jun 11, 2006 1:41 pm ]
Post subject:
BiodieselJeep.com wrote: Well, here's the thing. I don't want that tranny pooping out at 70,001 miles because I didn't flash and change the shift points or whatnot. But if you still think "ain't broke, don't fix it", I do usually follow that. I'm just new to diesels, and I want this beauty to last a long time. Turns out we bought a limited production collectors item! -Paul N From what the lawyer told me the monkey is on DC's back with the TSB's. You should download a copy of 18-009-06 and keep for your records. While you are at it get copies of 21-007-06 and 21-009-06 too, your lawyer will need those also. TSB 18-009-06 clearly states to the dealer that if they have the vehicle in for service to do the repairs (reflash), ie... it isn't your choice or the dealer's choice to get it done. If the tranny fails and they blame it on the lack of a reflash, pull your reciept for the service visit and the TSB and sue them. As for my own experience, it may be a coincidence but the trans starting doing some really strange stuff after the last reflash (18-009-06).

Author:	stevesmith7 [ Sun Jun 11, 2006 2:02 pm ]
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I just had the same code on my 05 at 15k miles. Took it in and they replaced the EGR control valve. I think I read somewhere the ground fault description for this code is incorrect for our CRDs. Runs fine now, ran fine before code. Steve

Author:	oldnavy [ Sun Jun 11, 2006 3:15 pm ]
Post subject:
BiodieselJeep.com wrote: Well, having tranny problems after the flash is not a good endorsement! However, I was hoping that a flash would help the shift points and lower rpms at highway speed. I drive at 75 on the highways and its almost exactly 2200rpms. Seems fairly high compared to what other people are getting, and my mileage isn't great (low 20's, calcualted the old way) on either Biodiesel or Dino-diesel... Has anyone gotten lower RPMs and better milage after the flashes? Or a suggestion on how to get low RPMs at 70+mph? Paul N 2005 CRM stock. usually running 100% Biodiesel 12,500 miles I averaged 33.7 mpg crusing at 68 to 72 mph and that is in the 2000 rpm to about 2200 rpm range, I would be more accurate as to rpms but it has been a couple of weeks since the trip and the exact figures of rpm's I do not remember.

Author:	RFCRD [ Sun Jun 11, 2006 4:58 pm ]
Post subject:
BiodieselJeep.com wrote: Well, having tranny problems after the flash is not a good endorsement! However, I was hoping that a flash would help the shift points and lower rpms at highway speed. I drive at 75 on the highways and its almost exactly 2200rpms. Seems fairly high compared to what other people are getting, and my mileage isn't great (low 20's, calcualted the old way) on either Biodiesel or Dino-diesel... Has anyone gotten lower RPMs and better milage after the flashes? Or a suggestion on how to get low RPMs at 70+mph? Paul N 2005 CRM stock. usually running 100% Biodiesel 12,500 miles The reflash won't do anything for your RPM's on the highway. It will alter the torque converter lock-up behavior. You will find that it will stay in lock-up more at @ 55-60 mph range after the reflash. Although the lock-up occurred more often, I felt it was much smoother on the old software. Mine feels like the lock-up engages more harshly now, actually thumps at times and can hear a hollow ressonance inside. I also feel a funky lock-up at @ 35 mph now under light acceleration, strong enough the rock me in the seat. Your observation of 2200 RPM is what I see @ 75mph and the low 20's (22-24 mpg) is consistant with mine on daily expressway commutes. Constant on & off the throttle chews fuel badly with any electronic controlled diesel. If you want to see an improvement in mileage, cruise control is a must. I guess mileage is relative to what you are expecting. This vehicle is definately geared for a 65mph driving enviornment, over 70 it drops off sharply.

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Author:	BiodieselJeep.com [ Sun Jun 11, 2006 6:29 pm ]
Post subject:
Yeah, even with 75 mph cruise, my last trip (loaded down, hitch rack, mostly highway and part mountain back roads) I got 22 mpg, but on 100% Biodiesel (which should be 5% or so less than diesel). Just tested and I am at 68 mph at the 2000rpm "sweet spot". Will try that speed next time on a big trip. Also might over-inflate the tires to 40 psi. So, the over all consensus: don't do the flash. What about the tranny oil filter replacement/ leak thing? That seems harmless enough to do. -Paul N