Go Back   DodgeForum.com > Dodge Trucks > Dodge Ram > 2nd Gen Ram Tech
Sign in using an external account
Register Forgot Password?


2nd Gen Ram Tech 1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.

P1757 & Intermitten P1762

Reply
 
 
 
 
Thread Tools Search this Thread
  #1  
Old 03-31-2011, 05:51 PM
army_greywolf army_greywolf is offline
Professional
 
Join Date: Jun 2007
Vehicle: 2000 Ram 1500 4x4OR
Location: Fond Du Lac, WI
Posts: 235
Default P1757 & Intermitten P1762

Alright guys, wrap your minds around this, because I need help.

I have a 200 dodge ram 1500 4x4 off road with the 5.9

Firstly my original trans ate up the front band and crapped out so I had a used unit rebuilt with a new torque converter. (the old unit's hard parts were all out of spec due to the front band destruction).

Right from the get go I've had PCM problems, from NO BUS on the dash to 3.8V bus to the trans (supposed to be five) and incorrect sensor readings due to a bad 5 volt + bus.

So I replaced the PCM, from there I've had the following issue. When you clear the codes, the truck will run in reverse, drive and so forth...however it stays in first. If you ramp it all the way to the PCM set max shift point it WILL shift to the next gear, let off the throttle and you have third...and even overdrive works, so does the o/d switch it will come in and out of O/D like it's supposed to...as soon as the trans finds its way back to first, this process repeats itself. By the third time it will set a code P1762. As soon as the check engine light comes on I lose first and have only second and third manual select only (no automatic shift function at all, otherwise known as limp mode.

At this point I decided something wasn't done right in the rebuild, took the pan off, inspected everything visually, checked the actuators and so forth for correct engagement with air pressure (as per FSM) and continued on with a off the truck test of the governor pressure solenoid. I replaced the solenoid regardless of finding no fault. I did not replace the transducer, it tested out correctly according to the FSM.

I reassembled the trans, replaced the pan gasket, filter and buttoned it up, took a little over six quarts to get it to the correct level. This time I started getting P1757 codes on the third start up, or the third time the truck shifted to park, once again the trans only had first unless it was run up to redline where it WOULD shift, and without a CEL at that.

So again, I broke out the code reader so I could watch live data. I observed the idle tps at 10.7% and WOT as 77.9%. I checked this out further by testing the input at 5.1V, which is well within tolerance. Beyond this I tried replacing the TPS, followed by setting the TV cable, replaced the spring for it as well since it was quite weak. From this point NOTHING in operation changed.

Then I read here that the upstream o2 sensor is on the same bus as the governor solenoid and it might correct itself if I unplugged it. I tried this, no change other than the codes you get for unplugging the sensor, this and the sensor works correctly it was changed a couple years ago. I also checked that circuit for short to ground and found none. During the trans replacement I cut off the pigtails to both the neutral switch and trans and spliced in a new one for each, the old ones were soaked in trans fluid and while the wires were very brittle the insulation was VERY soft, so soft i could peel it off with my fingernail.

Other things to note, I used atf+4 as it calls for, I flushed both the rad cooler and the external with diesel fuel...lines included, which resulted in alot of material finding its way out of both. I ditched the check valve and replaced it with a 3/8" trans cooler line w/ hose clamps.

I have not tried a pressure test, I haven't checked it out on a DRB and I'd rather not take it to a shop, if anyone has advise, or any possible reasons I am still encountering this problem I'm all ears.
This ad is not displayed to registered and logged-in members.
Register your free account today and become a member on Dodge Forums!
__________________
2000 Ram 1500 QC4x4OR 7" skyjacker 37" BFGs
Reply With Quote
  #2  
Old 03-31-2011, 06:09 PM
zman17's Avatar
zman17 zman17 is offline
Registered User
Dodge Forum Moderator
 
Join Date: May 2008
Vehicle: 2000 2500HD 4x4 5.9
Location: NH
Posts: 18,729
Default

Is the scan tool capable of reading the pressure of the governor solenoid/ pressure switch? The harness in the pan is known for rubbing against other components and creating a short. I would replace the solenoid and switch with new.


BTW, I don't see any mention of the TV cable? This thread provides directions to set it to factory position.http://dodgeforum.com/forum/2nd-gen-...-in-trans.html
__________________
2000 2500HD 4X4 5.9 and 4:10's,HF tuned SCT,Red-Head gear box, HS 1.7's,
50mm Fastman TB, Hughes Plate,2" Hell Bent ,Volant CAI
Flowmaster 50 series, Rock Solid Ram Steering fix,B&M trans cooler,fuzzy dice good for 5HP

Last edited by zman17; 03-31-2011 at 06:20 PM..
Reply With Quote
  #3  
Old 03-31-2011, 06:18 PM
army_greywolf army_greywolf is offline
Professional
 
Join Date: Jun 2007
Vehicle: 2000 Ram 1500 4x4OR
Location: Fond Du Lac, WI
Posts: 235
Default

Harness is new as is lock up and o/d solenoids, scan tool cannot look at pressure reading or temp, I had to do that by observing output voltages
__________________
2000 Ram 1500 QC4x4OR 7" skyjacker 37" BFGs

Last edited by army_greywolf; 03-31-2011 at 06:25 PM..
Reply With Quote
  #4  
Old 03-31-2011, 06:24 PM
zman17's Avatar
zman17 zman17 is offline
Registered User
Dodge Forum Moderator
 
Join Date: May 2008
Vehicle: 2000 2500HD 4x4 5.9
Location: NH
Posts: 18,729
Default

I'm not talking about the TC and OD solenoids. Those codes are for the other two. And what about the TV cable?
__________________
2000 2500HD 4X4 5.9 and 4:10's,HF tuned SCT,Red-Head gear box, HS 1.7's,
50mm Fastman TB, Hughes Plate,2" Hell Bent ,Volant CAI
Flowmaster 50 series, Rock Solid Ram Steering fix,B&M trans cooler,fuzzy dice good for 5HP
Reply With Quote
  #5  
Old 03-31-2011, 06:29 PM
army_greywolf army_greywolf is offline
Professional
 
Join Date: Jun 2007
Vehicle: 2000 Ram 1500 4x4OR
Location: Fond Du Lac, WI
Posts: 235
Default

the harness (including gov and transducer were all attached to the same harness that runs those solenoids which all came together, so yess all wiring inside the trans is new. TV cable works correctly through it's length of pull, and returns.
__________________
2000 Ram 1500 QC4x4OR 7" skyjacker 37" BFGs
Reply With Quote
  #6  
Old 03-31-2011, 07:01 PM
zman17's Avatar
zman17 zman17 is offline
Registered User
Dodge Forum Moderator
 
Join Date: May 2008
Vehicle: 2000 2500HD 4x4 5.9
Location: NH
Posts: 18,729
Default

The harness is connected to the TC lockup and OD solenoids, the Gov pressure switch and solenoid are separate plug in devices. That's great that the TV cable moves in and out, but, is it adjusted correctly? You don't just slap it on you know.
__________________
2000 2500HD 4X4 5.9 and 4:10's,HF tuned SCT,Red-Head gear box, HS 1.7's,
50mm Fastman TB, Hughes Plate,2" Hell Bent ,Volant CAI
Flowmaster 50 series, Rock Solid Ram Steering fix,B&M trans cooler,fuzzy dice good for 5HP
Reply With Quote
  #7  
Old 03-31-2011, 08:31 PM
HeyYou's Avatar
HeyYou HeyYou is offline
Section Moderator
Dodge Forum Moderator
 
Join Date: Apr 2010
Vehicle: 1996 Dodge Ram 2500
Location: Adrian, MI
Posts: 34,310
Default

Unplug the 8 pin connector on the drivers side of the trans. Take the truck for a ride. You will have ZERO automatic functions, you will HAVE to shift manually. Run the truck up and down thru the gears a time or three. Everything work as advertised? Replace the pressure transducer. Just because it tests good in one circumstance, does not imply that it is good under ALL circumstances. They are notorious for failure.

If they were replaced when the trans was redone, that also is no guarantee of good parts. if the rebuilder used reman parts, you may have gotten bad ones right there. That, and the remans don't last long either...
__________________
1996 Ram 2500 5.9 EC/SB Gas, Auto, 4x4, Hughes plenum plate, Kegger mod, double roller timing set, rest is stock. For now.....
Reply With Quote
  #8  
Old 03-31-2011, 08:43 PM
zman17's Avatar
zman17 zman17 is offline
Registered User
Dodge Forum Moderator
 
Join Date: May 2008
Vehicle: 2000 2500HD 4x4 5.9
Location: NH
Posts: 18,729
Default

Quote:
Originally Posted by HeyYou View Post
Unplug the 8 pin connector on the drivers side of the trans. Take the truck for a ride. You will have ZERO automatic functions, you will HAVE to shift manually. Run the truck up and down thru the gears a time or three. Everything work as advertised? Replace the pressure transducer. Just because it tests good in one circumstance, does not imply that it is good under ALL circumstances. They are notorious for failure.

If they were replaced when the trans was redone, that also is no guarantee of good parts. if the rebuilder used reman parts, you may have gotten bad ones right there. That, and the remans don't last long either...

Umm! That just sounds like a bunch of jibberjabber to look smart if you ask me.
__________________
2000 2500HD 4X4 5.9 and 4:10's,HF tuned SCT,Red-Head gear box, HS 1.7's,
50mm Fastman TB, Hughes Plate,2" Hell Bent ,Volant CAI
Flowmaster 50 series, Rock Solid Ram Steering fix,B&M trans cooler,fuzzy dice good for 5HP
Reply With Quote
  #9  
Old 03-31-2011, 08:49 PM
HeyYou's Avatar
HeyYou HeyYou is offline
Section Moderator
Dodge Forum Moderator
 
Join Date: Apr 2010
Vehicle: 1996 Dodge Ram 2500
Location: Adrian, MI
Posts: 34,310
Default

Quote:
Originally Posted by zman17 View Post
Umm! That just sounds like a bunch of jibberjabber to look smart if you ask me.



Dammit zman, don't give away my secrets like that.
__________________
1996 Ram 2500 5.9 EC/SB Gas, Auto, 4x4, Hughes plenum plate, Kegger mod, double roller timing set, rest is stock. For now.....
Reply With Quote
  #10  
Old 03-31-2011, 09:12 PM
newman1367's Avatar
newman1367 newman1367 is offline
Veteran
 
Join Date: Dec 2010
Vehicle: '01 & '95 dodge ram 1500 4x4
Location: Brownsburg, IN
Posts: 487
Default

I'm gonna guess the rebuilt trans wasn't a 2000 or 2001 model. If that's true, theres your problem.
__________________



When I die, I want my body to be thrown out of a plane wearing a Superman costume!
Reply With Quote
  #11  
Old 03-31-2011, 09:19 PM
zman17's Avatar
zman17 zman17 is offline
Registered User
Dodge Forum Moderator
 
Join Date: May 2008
Vehicle: 2000 2500HD 4x4 5.9
Location: NH
Posts: 18,729
Default

It would still shift normally, the TC just wouldn't lock up and it would have no OD.
__________________
2000 2500HD 4X4 5.9 and 4:10's,HF tuned SCT,Red-Head gear box, HS 1.7's,
50mm Fastman TB, Hughes Plate,2" Hell Bent ,Volant CAI
Flowmaster 50 series, Rock Solid Ram Steering fix,B&M trans cooler,fuzzy dice good for 5HP
Reply With Quote
  #12  
Old 03-31-2011, 09:34 PM
tweeker909's Avatar
tweeker909 tweeker909 is offline
Professional
 
Join Date: Jan 2011
Posts: 199
Default

Quote:
Originally Posted by HeyYou View Post
Unplug the 8 pin connector on the drivers side of the trans. Take the truck for a ride. You will have ZERO automatic functions, you will HAVE to shift manually. Run the truck up and down thru the gears a time or three. Everything work as advertised? Replace the pressure transducer. Just because it tests good in one circumstance, does not imply that it is good under ALL circumstances. They are notorious for failure.

If they were replaced when the trans was redone, that also is no guarantee of good parts. if the rebuilder used reman parts, you may have gotten bad ones right there. That, and the remans don't last long either...
What is that going to do other then remove the short he is trying to find within the harness some were down the line doesnt mean its the sensor/solenoid.

Check the ground going to the governor pressure sensor and the 5-volt reference and voltage for the signal wire as you drive the truck.
If that checks out do the same with the 02 sensor as you drive.
If the voltage raises note when and at what speed it raises at.
__________________
Reply With Quote
  #13  
Old 03-31-2011, 09:36 PM
army_greywolf army_greywolf is offline
Professional
 
Join Date: Jun 2007
Vehicle: 2000 Ram 1500 4x4OR
Location: Fond Du Lac, WI
Posts: 235
Default

alright firstly, read my first post in its entirety. I did adjust the TV, the gov sol is NEW, the transducer is not, the trans is from a SAME YEAR truck as I do know it's a big deal if its from a 99 or 98... 00 and 01 are interchangeable though. the trans shifts all ranges mechanically. O/D lockup works, the pcm is BRAND NEW, the reference voltage bus is 5V on all circuits tested, the o2 sensors are not at fault and that in a nutshell is where I am at. Oh and so that it isn't missed three times in a row, I adjusted the TV, replaced the TPS and GPS...and this is where I stand with these codes still coming up.

and yes I will need to check the ground, at first light I'll do that. if anyone can get me the pinouts to the pcm I'll bypass the harness entirely, I KNOW there is a short at this point.

Interesting factoid, my evap purge didnt work at all previous to the pcm change and I got a circuit fault code for it, but now it works, I had originally believed it was a wiring problem, I guess not.
__________________
2000 Ram 1500 QC4x4OR 7" skyjacker 37" BFGs

Last edited by army_greywolf; 03-31-2011 at 09:41 PM..
Reply With Quote
  #14  
Old 03-31-2011, 09:45 PM
HeyYou's Avatar
HeyYou HeyYou is offline
Section Moderator
Dodge Forum Moderator
 
Join Date: Apr 2010
Vehicle: 1996 Dodge Ram 2500
Location: Adrian, MI
Posts: 34,310
Default

Grab the 01 service manual from the faq section here, it will have all the pinouts.
__________________
1996 Ram 2500 5.9 EC/SB Gas, Auto, 4x4, Hughes plenum plate, Kegger mod, double roller timing set, rest is stock. For now.....
Reply With Quote
  #15  
Old 03-31-2011, 09:45 PM
zman17's Avatar
zman17 zman17 is offline
Registered User
Dodge Forum Moderator
 
Join Date: May 2008
Vehicle: 2000 2500HD 4x4 5.9
Location: NH
Posts: 18,729
Default

I'd replace the transducer then. Other than checking the ckt as already suggested above, I can offer no more help. Sorry for missing the setting of the TV cable in your original post. Good luck
__________________
2000 2500HD 4X4 5.9 and 4:10's,HF tuned SCT,Red-Head gear box, HS 1.7's,
50mm Fastman TB, Hughes Plate,2" Hell Bent ,Volant CAI
Flowmaster 50 series, Rock Solid Ram Steering fix,B&M trans cooler,fuzzy dice good for 5HP
Reply With Quote
  #16  
Old 03-31-2011, 09:51 PM
army_greywolf army_greywolf is offline
Professional
 
Join Date: Jun 2007
Vehicle: 2000 Ram 1500 4x4OR
Location: Fond Du Lac, WI
Posts: 235
Default

I have the service manual and as soon as I typed that I realized what I was saying...

Anyway, I'm going to bypass the harness and run the wires that do go to the pcm without being junctioned off/spliced right to the pcm. I'll also look at the gov sol psi tomorrow since I can get access to a drb.
__________________
2000 Ram 1500 QC4x4OR 7" skyjacker 37" BFGs
Reply With Quote
  #17  
Old 04-04-2011, 10:48 PM
army_greywolf army_greywolf is offline
Professional
 
Join Date: Jun 2007
Vehicle: 2000 Ram 1500 4x4OR
Location: Fond Du Lac, WI
Posts: 235
Default

Well, a bit of an update.

First, I did NOT bypass the harness. I did replace the transducer, returned the brand new gps and replaced it again, double checked the wiring and the harness connector (which are all brand new btw) and now I developed a new problem.

The truck randomly dies, or loses almost all power, sometimes it will start right back up and behave normally, other times key on engine off it will flash the odometer over and over and have no gauge reading, then if left alone it will "fix" itself and work properly.

Not only that but I now have compared two PCMs with the same results so I know it is the truck itself not the PCM and not the trans doing this.

New codes P0443, P0753, P1762, I suspect these all relate to a common ground problem or a common 5v/12v bus problem. Can someone who has access to alldata/mitchell please email me the complete 2000 Dodge Ram 5.9V8 1500 w/Auto wiring schematics? I can find this in a heartbeat if I don't have to scroll through bits and pieces of what should be a legible wiring diagram in the service manual.

Last edited by army_greywolf; 04-04-2011 at 11:00 PM..
Reply With Quote
  #18  
Old 04-05-2011, 08:18 PM
army_greywolf army_greywolf is offline
Professional
 
Join Date: Jun 2007
Vehicle: 2000 Ram 1500 4x4OR
Location: Fond Du Lac, WI
Posts: 235
Default

alright so another update and id appreciate some help with this.

can anyone answer as to what the gov pressure sensor signal should be at idle/cruise/wot in ohms/volts (volts from c2 29 to ground or ohms from c2 29 to c1 4 (the pcm connectors) if anyone can help id appreciate it.

my problem is that the sensor's temp is working, but the gov pressure signal im not sure what value it SHOULD have at what pressures. my oppurtunity to use a drb fell through...oh well, anyone able to help?
Reply With Quote
  #19  
Old 04-05-2011, 08:29 PM
zman17's Avatar
zman17 zman17 is offline
Registered User
Dodge Forum Moderator
 
Join Date: May 2008
Vehicle: 2000 2500HD 4x4 5.9
Location: NH
Posts: 18,729
Default

Maybe this will help, maybe not. http://www.socaldieseltrucks.com/for...roubleshooting
__________________
2000 2500HD 4X4 5.9 and 4:10's,HF tuned SCT,Red-Head gear box, HS 1.7's,
50mm Fastman TB, Hughes Plate,2" Hell Bent ,Volant CAI
Flowmaster 50 series, Rock Solid Ram Steering fix,B&M trans cooler,fuzzy dice good for 5HP
Reply With Quote
  #20  
Old 04-05-2011, 09:03 PM
army_greywolf army_greywolf is offline
Professional
 
Join Date: Jun 2007
Vehicle: 2000 Ram 1500 4x4OR
Location: Fond Du Lac, WI
Posts: 235
Default

well the p0753 was a latent code in my old pcm, and i jumped the gun on that one. It is not present at this time, nor is the evap code. only code present is 1762.

Now I only need one thing answered. What is the STATIC (no pressure, key off) value from C2 pin 29 to ground supposed to be in ohms.

I tested the one on the truck (this is the transducer so you know, you can test it at the connector under the truck, its the wire that is light green/white stripe, test to ground. The truck reports 870 ohms. The old transmission (my original with a bad forward band) the sensor tested at 1890 ohms (1.89K ohms), if someone could PLEASE tell me what their known good sensor value is key off engine off... I would be VERY appreciative. I want to know because I can if the value matches the old trans...quite obviously save some money and replace it with that and another 6 quarts of fluid...out a total of 34 bucks.

(I also realize the sensor values vary and the pcm calibrates them, but if they are supposed to be wildly different...i'd like to know.)
Reply With Quote
Old 04-05-2011, 09:03 PM
 
 
 
Reply




Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Join DodgeForum
Advertising

Featured Sponsors
Vendor Directory
Our Sponsors
All times are GMT -4. The time now is 01:22 PM.

Internet Brands, Inc.


Contact Details & Emails