I've spent all day looking at posts and trying to figure out my problem. Truck is a 2500 and has been showing a check engine light and when the light comes on the cruise control will shut off. While towing about 6000 lb trailer for a 500 mile round trip it started shutting down for no reason just like it did before the dealership replaced the pump and then the PMD at seperate times under warranty(I don't trust them for any other work). Sometimes it would come back on when you feathered the throttle and then sometimes it would die completely. Codes being shown are 31, 35, 36, 49, 57, 62, 65, 78, 84, 87, and 99. Battery cables good and tight and when I had this problem before 20k miles ago I replaced the lift pump and believe that it is still good. Also where is the best place to get gauges and pods? Which gauges, boost, egt, tranny temp and what else? Thanks and I know its a lot of ?'s.

Your winning numbers are:


DTC 31 - EGR Control Pressure/Baro Sensor Circuit Low (High Vacuum)DTC 35 - Injection Pulse Width Error (Response Time Short)


DTC 36 - Injection Pulse Width Error (Response Time Long)


DTC 57 - PCM 5 Volt Shorted


DTC 62 - Turbo Boost Sensor Circuit Low


DTC 65 - Accelerator Pedal Position 3 Circuit Range Fault


DTC 78 - Turbo Wastegate Solenoid Fault


DTC 84 - Accelerator Pedal Position Circuit Fault


*DTC 87 - High Ratio Error


The last two are tranny codes. Refer to Kennedydiesel.com under tech tips for entire listing of OBDI code listings. Looks a little weird, like bad connection in the wiring harness and blowing a whole bunch of codes at ya. Check engine ground too. It's the braided cable between the head and firewall.

that's alot of DTC'S


What year is your truck? HD or LD? I would start by checking over the wiring. on the Ip and around it and then grounds from ECM to frame and


Clear the codes and see which come back.Edited by: quantum mechanic

How do you clear the codes besides un- pluging the battery ?

Would code 84 and 99 be for auto tranny only ?

To clear DTC's


On OBDI you can step on the APP with ALDL pins A and B jumped or use a scan tool.


M/T has APP too, no?Edited by: quantum mechanic

It's a 1995 and I think that it is a HD. Pretty sure of it. If I disconnect the batteries will it clear the codes?

Disconnecting the batteries should clear the codes.

I'll do it and check the codes again. Found a used PMD thks am that was pulled off and not the problem for $125 was quoted 275 at the dealership. Is this a good deal?

OK, this is what I have found. Pulled the Turbo Power cover off and found a hell of a mess. There was oil all over on the rear passenger side coming out from between the upper and lower plenum halves(?). Seems that the 2 center bolts were stripped out and the passenger side rear bolt was loose. Tightened the one up, disconnected the batteries, and took it to lunch. When we got there it flashed no codes other than the 12, 12, 12, - 12,12,12. Which it did not flash yesterday before or after the trouble codes. Seems to have a lot more power and we will see if it is leaking anymore. Will helicoil the two center bolts later today if I can. Is there a gasket that goes between the two plenum halve. Possibly will polish and debur some on the plenum.

Okay flashing 12 only is a good thing means the rest are clear is SES comes back check again using this list


http://dieselplace.com/forum/forum_posts.asp?TID=16780&P (http://dieselplace.com/forum/forum_posts.asp?TID=16780&PN=1) N=1

I just did a post on cutting back the boss to get to the thread on the lower plenum on those two center bolts. The upper gasket is $11 dollars

Dave is this an EGR engine, dead center of the intake a vacuum controlled device???

This is a pic of the engine. http://www.dieselplace.com/forum/uploads/DavidW/2004-10-18_130110_6_430X322.jpg

nope NO EGR there.

Also where is the best place to get gauges and pods? Which gauges, boost, egt, tranny temp and what else?





Now for the esy ones - Those are the basic 3 guages you need.


ISSPRO, Di/Procol, Check the various sponsors - I got ISSPRO and a 3 gauge pillar pod forma dealer up here in MT. You should have a few in TX, or these' Kennedy diesel and Heath Diesel. Pillar pod is standard Autometer I believe.


I recommend the Pre-Turbo version for the EGT - easier to put in than it seems and I drilled the exhaust manifold.

OK now I've driven the snot out of the truck all afternoon (highway speeds up to the governor - 96mph) and no SES and only one stumble which as soon as it happened I shut it down and checked for code and had nothing. The 2 bolts on the center of the upper plenum are where the oil is leaking from now. Not much but some. Is the oil from the crankcase ventilation or from possibly the turbo? What is EGR and I keep seeing refrences to wastegate ineffeciency, what is that about? Thanks!

Go to the FAQs and read up on CDR source of most if not all of your oil, also visit the RPO code link then you can update your signature line with equipment list which will help us better to assist you.


EGR is exhaust gas recirculation you don't have it, it would be dead center of you upper intake emissions equipment normally used on L56 LD Light Duty trucks, yours is a L65 HD heavy duty truck engine not normally rigged with EGR


Look about half way thru this link is a pic of a EGR intake http://myweb.cableone.net/tbogemirep/ (http://myweb.cableone.net/tbogemirep/)Edited by: Turbine Doc

DTC 36 means the fuel solenoid is giving a greater than 1.90 ns closure time. It is in your IP and a compentent fuel shop should have the equipment and experience to replace it, if that is the only thing wrong with the pump.


Check for vacuum At the turbo vac actuator and before the solenoid. it should read ~15" and ~25" Hg.


Please update your signature with all your truck info. How many miles on the IP? On the truck?Edited by: quantum mechanic

I'm back, had to catch up on a bunch of work. Sig line updated, PMD replaced at 12/05/02 with 104,777 - inj pump at 12/24/01 with 87,328 miles. Truck has 142,500 miles now. Still getting codes 35 and 36 with the cruise control shutting down when the SES comes on.





"DTC 36 means the fuel solenoid is giving a greater than 1.90 ns closure time. It is in your IP "





Would this be the pump or the driver?





Thanks!

Any ideas, I don't have a vacum guage to check the selenoid. The truck is still cutting out but now sometimes under heavy throttle only. Pump or driver or maybe both? Help!

Anyone?

Let's start from the top. Have you done the lift pump test yet? Very simple, open the petcock water drain on the thermostat housing. If you have fuel, coming out for 30 seconds, good to go on the lift pump, if not, and dies, then, suspect OPS/Lift pump. No lift can throw some codes sometimes.


Good fuel filter? Air filter?

DTC-57 is the problem - if the 5volt reference voltage is shorted, all the other codes are meaningless.


Suspect the engine wiring harness - grounds, connectors, etc - particularly at this time of year, where climate is changing to cold and damp.


Start at lower passenger-side firewall, where harness enters engine bay, and work up from there.


Look for frayed wires, oxidized\corroded connections, loose or cruddy grounds to engine block, Inj Pump, bad connection at starter solenoid, etc.


Ignition switch was totally revised around 95-96 - located in the steering column area where the key lock is - can throw some nasty symptoms when contacts pit and burn.


Either that, or a bad Inj Pump........


Which is cheaper - thorough preventive maintenance inspection (free), or new IP (not free)? Edited by: gmctd

OK, cracked the petcock drain and nothing happened, No fuel, no stutter, was kind of hard to open, so tapped lightly with a small wrench and the damn thing just died. Changing filter and lift pump now and will see if that helps. THANKS!