Archived No Charging+Trans Limp&1682,0753,1765,1693

[LoneRam]

This morning the truck stopped charging, "check gauges" light came on and I had no first or forth gear. My codes are 0753, 1765, 1682, 1693. Ive looked them up and am tracing wires based on that. Ive checked what seems obvious, main fuse in the pwr dist center, all connections, trans shift solenoid. There is no + voltage being applied to the field on the alternator. It appears to have the - though. I tried jumping + in but couldnt read the gauge and hold the wire so that was a waste. I also have a Viper 800 alarm which is acting a little screwy. Im going to pull the install schematic for that as well, just in case. Any ideas would be great. Im in guam so I dont have a lot of shops to seek help at.



Alaun

 

[LoneRam]

Update

The alarm system is a 550 esp but I cannot find a schematic for it. I have verified the ASD relay is sending power to the PCM and I have checked all connections I can think to check. Still nothing. I am now sleeping at work as I have no other way in, Im willing to try any "huntches" you might have. Thanks

 

[LoneRam]

Still nothing. Batteries are about dead. TTT

 

[crabman]

LoneRam,

Codes are as follows:

1682=Charging system voltage too low*

0753=Trans 3-4 shift sol/trans relay circuits

1765=Trans 12 volt supply relay control circuit

1693=DTC detected in ECM or PCM

You can find the list of codes in the FAQ section of the 2nd Gen.

*My money is on the C/SPS(crankshaft position sensor) which tells everything that the engine is running.

Charge the batteries and then check out the C/SPS connector, clean and use dielectric grease on connector.

Good Luck!!

crabman

 

[LoneRam]

If it was the Camshaft Position Sensor, wouldn't my tach also not work?

 

[LoneRam]

AArrrrgggghhhhhh

Still nothing. Checked the Cam Pos sensor, works fine. Found the Positive side of the Alt. field grounded on the dipstick tube. Spliced it and restarted, no joy. I have not reset the codes yet, maybe thats all thats left, but after that Im on my way to buy an external regulator.

 

[Marco]

LoneRam,

Sorry to tell you that... I've seen it several times. It's most likely an internal failure of the PCM. I've fixed several for that problem. It's a dead transistor in the voltage regulation circuit of the PCM. Thus no field for the alternator and no juice for the transmission solenoids.



Let me know if I can help you further.



Marco

 

[LoneRam]

Options?

Well Marco,



Im actually kinda glad to hear that. Makes feel like I didn't get stumped cause I was out of ideas.



So, what are my options? Can the circuit be bypassed externally? Whats the cost of a new PCM and the hassle of having it flashed here in Guam? What do you have to offer as far as PCM's? Cost? Thanks. For now Im plugging it in to the charger. Is there a way to power up the trans solenoid? Thanks.



Alaun

 

[Marco]

Very stupid question first.

Where is "Guam"???

That said...

So, what are my options? Can the circuit be bypassed externally? Whats the cost of a new PCM and the hassle of having it flashed here in Guam? What do you have to offer as far as PCM's? Cost? Thanks. For now Im plugging it in to the charger. Is there a way to power up the trans solenoid? Thanks.

Ok, lets see. For the alternator you could use an external regulator, that's not a biggie. For the trans, well that's a different story... :{



Do you have the factory anti theft stuff in your truck?

If so even if you find / buy a used PCM it won't work in your truck. ( Engine will die ). The PCM has to be prgrammed with the DRBIII in order to match the rest of your truck. If you can't find a DRB in Guam wherever that is...



If no OEM anti theft, then any PCM could work...



I don't know the cost of a new PCM, always repaired them... Here in Europe one can't simply pay a visit to a dealer and order a new one. It's a little more complicated...



With a little luck there could be another way. A few times I've found only burned traces on the motherboard of the PCM. If that's your case then simply repairing them ( soldering) could do the trick.



How confident are you with electronic stuff and repairs. Maybe I could provide you the instructions to repair the PCM? Not that complicated... .



Let me know.



Marco

 

[LoneRam]

Thanks Marco

Well lets start with Guam. I little island east of the Philipinnes, due east of Manila. I do have the factory anti theft and an aftermarket alarm as well. I was looking at the schematics for the supply from the PCM to the Trans control relay which simply shifts to provied 12v to the Trans solenoid. Seems I can do that myself, only 12v right? As for the the motherboard, I'd give it a go, sounds like I dont have much to lose right? I will have next week off though I had other plans that this. I am a diesel technician by trait but keep a butain soldering iron under the back seat. I would welcome any help/guidance you would be willing to give on repairing it myself. I will take it out tomorrow and see what I find. Thanks.



P. S. You can go to Google and type Guam under the images tab and see a map there.



Alaun

 

[Marco]

I did the google thing before I read your MSG...

MAAAN I'm smart... LOL

Musta be a great place!



You have the OEM anti theft stuff...

Sh. . you have to get the PCM programed for you truck.

Eventually, can you get that done in Guam? If not it's a BIG problem...



You said that you found the Positive side of the Alt. field grounded on the dipstick tube. = A short. Could be that only a few traces are burned in the PCM



Basically, you have to open the PCM... Take off the screws. Use a knife, grind of the tip in order to obtain a tool to insert into the "opening" arround the plate of the PCM. Gently lever it open. It's sealed with some kind of RTV sealant.



Once it's opened. Can you send me a pic of it's internals? I can then direct you where to look @.



Marco

 

[LoneRam]

Will do. I'll send the the picts later today.

 

[LoneRam]

This is the only area that looks bad. second row, first three and top row, fourth pin.

 

[LoneRam]

Well, I got excited and connected the first pin on the second row to the fourth pin on the first. Well see.

 

[Marco]

The voltage transistor I've talked about is located in the middle of the motherboard. I've always found the burned traces there...

Though, having to deal with a short in the wires it could be anywhere.



Marco

 

[LoneRam]

Yahoooooooooo

Oo. Oo. Oo.

Well, soldered a wire from the two pins, and whola!! that was it. Good to go. Big thanks to you Marco, if you hadn't mentioned you'd done if before, I'd have never had the hevos to open it up and do it.



Problem solved. Thanks



Alaun

 

[Marco]

Glad to hear!



Marco