Archived Engine quit on off ramp. I was changing my computer port and shorted something

[Zapsurf]

1st I have no power to my computer port. I heard something short out to the left maybe behind the fuses. I have the wiring diagram and it is on the 5 amp fuse than supplies the instruments. There is no power to the top of the fuse. because of this my Actrol scanner will not work. Help. I changed the Crankshaft sensor. nothing. I have fuel thru to the injectors that I can breed. Soo how do I get power back to my 5 amp instrument cicuit and what else could it be? thanks Richard

 

[Sticks]

How about a little info about your truck.

Year, model, and any/all in cab after market accessories you have wired in and where.

By computer port, you mean the OBDII port, or something else? ECM, PCM, TCM...

Why you would change out your CPS is a mystery if you hear an electrical short.

What exactly were you doing when you heard the short?

Please make sure you are using the correct terminology. Fuse panel is in the cab/dash panel. Power Distribution Center (PDC) is another fuse and relay box in the engine compartment.

 

[Sticks]

Reading your past posts, not sure if you are in the '99 or the '09. You also have a tendency to not post what the problem was or any other information/if the suggestions to your problems fixed your issues. Help us help you.

 

[Gary - K7GLD]

Sure is hard to help, when the helper is flying blind...

 

[Zapsurf]

99 kingcab 4wheel drive auto with a edge controller. First before I broke down I was in the process of replacing my Obd2 port without disconnecting the batteries and the power leads touched and something to the left maybe behind the cab fuse block went zzzert and now there is no power to the top part of fuse #5 whicxh is a 5 amp fuse. This keeps me from using my scan tool to read the codes from my truck. so untill I can the power back I'm guessing at what killed my engine. I changed the fuel filter, lift pump, and CPS. It cranks over and I have low pressure fuel from 3 of the injector nuts that and easy. I'm hoping its not my Injector pump which has 175k on it. The truck has 300k. Could it be as simple as a relay that run the injection pump? thanks Richard

 

[DavidC]

Well, there is fuse #5 powered from the dimmer switch to instrument lights. This is a 99 Dodge schematic. Don't think this is your problem.

 

[Sticks]

The OBDII power comes from the cigarette lighter/accessory fuse. Check that... Check all the fuses in the fuse panel, then check all the ones in the PDC under the hood. If you are not even getting power at some of the ports at the fuse panel, something might be blown elsewhere up the line.

Why were you replacing the port?

We kind of need to get back to what happened when the engine quit. Just coming off the highway and the engine up and died? No warning signs or symptoms?

 

[sag2]

The data link connector B+ (pin 16, pink wire) comes from fuse 12 in the junction block.

 

[Zapsurf]

I was replacing the Obd2 port because someone had broken it and my scan tool would not work. Now that I have it replaced the tool says it must be powered by the vehicle. I have been checkingn the wiring diagram which I believe shows number 5 fuse powered by headlamp switch which is powered by fuse 1. I have power thru fuse number 1 so it must be in the headlamp switch. I need to get the port operatonal so I can read the codes for why the truck quit. OK so now on to the truck quiting. No forwarning, just shut off. Is the Injection pump mechanian run and Electrical controlled? Should I not be able to check for 12volts at the connector on the pump? What wires? Thank you so much for your help. because my work truck is down I,ve been driving my Ford! Richard

 

[Missouri Mule]

VP44 has computer attached to which gets comands from the ECM. It has a mechanical fuel pump inside of it. If the lift pump dies the VP44 will run for a while but finally burn out. Check fuel pressure you should have 14 to 16 psi at idle.

Blue Chip Diesel has article how to check VP44 www.bluechipdiesel.com

 

[BLNRAY]

Looking at 99 schematic in a Mitchell manual not dodge,it looks like the ddl wirirng runs between the PCM and the ECM and apears to not be a circuit breaker or fuse there,you may have shorted the ecm or the pcm

 

[Sticks]

I did some digging, I don't have a 99 service manual (every other manual for a 99 though) and the wiring for '01 is Fuse 12 - radio, dome/in cab lighting, and power mirrors.



Pin 16 is the B+ wire in the OBDII port M1 20PK wire running direct to a junction then M1 22PK to the fuse.

Pinout for the port from my 99 manual

 

[Sticks]

Double check your wiring for that OBDII port you replaced to make sure you wired it in correctly.

If you have to, disconnect the M20pk wire from the joint connector and run a direct power to it to feed your OBDII port to at least get something going on there.

 

[Zapsurf]

Thanks for the help. My power problem to the OBD2 port was fuse #12. that was the noise I heard when I was changing the port. Thanks. Now that I have that working my scan tool still won't read any codes. I have checked fuses and relays. With the ign. on I have 12 volts the the back of the injector pump. What other sensor could have failed or maybe my PCM. Engine cranks but no start. I will try breeding the injectors again after I have played with everything now. How do you test sensors with out the enging runing? Still dead in the water. Richard

 

[Sticks]

Thanks for the help. My power problem to the OBD2 port was fuse #12. that was the noise I heard when I was changing the port. Thanks. Now that I have that working my scan tool still won't read any codes. I have checked fuses and relays. With the ign. on I have 12 volts the the back of the injector pump. What other sensor could have failed or maybe my PCM. Engine cranks but no start. I will try breeding the injectors again after I have played with everything now. How do you test sensors with out the enging runing? Still dead in the water. Richard

Not trying to be an arse... . Post #7 and #8 told you to check both all the fuses in the PDC and in cab, and specifically fuse 12. You could have had it then. Read all the posts. We are trying to get you going.

If at any time since it died you disconnected the batteries, that IIRC would have cleared any codes. I don't remember if they were able to keep them in memory with the power disconnected.

Refer to Missouri Mule's post (#10). Test your fuel pressure at the VP - even for priming with the engine off, you need to have at least 10-16psi. If you don't have a gauge, you can crack open the inlet line to the VP (17mm wrench) to see if you are at least getting good fuel. Crack open the fitting, bump the starter to engage the transfer pump (you should be able to hear it) then if you are not getting any fuel, loosen the inlet fitting slowly. If you get a full turn out of it and no fuel or the priming cycle stops, bump the starter again to re-prime. If you still have no fuel, you have a supply issue. If you literally get fuel spraying out from around the fitting (READ - getting fuel everywhere, including right at you), you have somewhat decent pressure and flow to call it good enough. If you got a bunch of air out at first, then good fuel, close up the inlet line, then crack open the return relief fitting (19mm wrench) and cycle the transfer pump again to get rid of any additional air in the VP44.

The link to blue Chip Diesel has very good step by step directions for testing the VP44. Follow them.

You must have fully charged batteries. If the voltage during cranking drops below 9vDC, the engine will not fire. Insufficient voltage for the ECM and the cranking speed will be to slow. It's safe to presume you will have another vehicle with you when you are working on this, hook up some jumper cables to the passenger side battery (not mandatory, just keeps the jumper cables out of your way), verify that you are connected good (dash volt meter should show 12-14v), and keep the spare vehicle running.

There is a relay in the PDC for the injection pump, it's labeled. You can try swapping it out with either a new one, or a known working one from the PDC, like the horn or AC.

 

[Sticks]

Link to Blue Chip VP diagnosis



http://www.bluechipdiesel.com/vp44diagnostichelp.html



Link to Blue Chip Transfer pump diagnosis



http://www.bluechipdiesel.com/lift_pump_diagnostics.html

 

[DieselLady]

I'm with sticks, go change fuse 12 and then see if you have power to the OBD port. If you have an edge controller, with no power to the obd port, I doubt it will start. Change the fuse and see if you have power there, if not, remove the edge first. Then try to start it. ")

 

[Sticks]

Zapsurf - So what's the deal. Truck still down, got it fixed, gave up??? Let us know.

 

[Zapsurf]

truck is still down. I have only been working on it on sunday. I will try again tomorrow. Thanks Rich

 

[Zapsurf]

I used a different scan tool which read the codes. P1388-auto shutdown relay control circuit-an open or shorted condition detected in the ASD or CNG shutdown relay control circuit. The other code which I have had for awhile has to do with my trans not shifting out of !st gear quickly-P1694. I checked the ASD relay and it is good. What is a CNG? My service manual shows the ASD is controlled by the PCM. Would my PCM be the problem or something less costley? Thanks Richard