Truck died while driving
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From: Van Wyck SC
Well truck didnt run with original pcm in it yesterday..Im going to try what Clay suggested and see what happens....Im going to also unplug all the stuff on the front of the motor and pull it up where i can get at it and check for bad spots...Also run it and move the harness around to see if I can get it to act up...Im thinking it was a bad connection at the cps or a wiring issue to it....My scanner stuff some be here first of the week....We are expecting 2 to 3 inches of rain this weekend so work time will be limited....
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From: Van Wyck SC
Dead again.. I looked athe the cps wiring this morning and it all looked good....Put it back together and it started for about 30 seconds then quit again... I was going under the truck to check the plug so I left the key on the see if it was a lose connection...Long story short I was going to put a spare cps in and had the key on unplugged the cps and was taking out the 10mm bolt and I heard the fuel pump start running with the cps unplugged...So i guess I have a lose connection in the main harness .... Any ideas of common bad spots would help out....
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From: Van Wyck SC
Well I got my AE today.....Got it all loaded up and went to the truck to try it out..... The way my Mondays have been going I figured this was not going to be easy....Well it was never able to connect with the pcm....So I swapped out to my spare pcm and still nothing....There may be a truck for sale soon....... Any ideas would be great.... Ive looked looked and looked for shorts,bad fuses,relays,dirty bad connections....This thing is kicking my ***....
Post Fiend
Joined: Mar 2007
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From: Texas
Sometimes it can be a pain getting AE to connect. First, check your cigarette lighter. If it's dead, double check the fuse for it. Next, when you turn the key on (not start), do you hear the fuel pump kick on? If not, the PCM is likely not getting power. Keep cycling the key and wiggling wires until you hear the fuel pump kick on. Then try and connect with AE. If the PCM has no power, it won't connect to a scanner.
Since you've been swapping PCM's, make sure you did get the wiring harness screwed back into the PCM good.
Since you've been swapping PCM's, make sure you did get the wiring harness screwed back into the PCM good.
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From: Van Wyck SC
Hey Chris cig lighter is good....I dont have power to the fuel pump...Tomorrow i was going to remove the pcm and with the key on ground the pcm trigger wire to the fuel pump relay to check the rest of the fuel pump wiring....If it works then i guess the cjb is ok...The funny thing is the idm and the pcm relays pull in when the key is on...The crazy thing is it started working on Friday then I was able to get it in the shop...Saturday it died again ....Im thinking a short or a bad connection somewhere but I cant find it...I was hoping the AE could tell me what wasnt working so I would have a direction to goto....I went out late last night after reading FreeDevin's post he had awile back and I didnt see a problem there....The search goes on....I hope to talk with Jody tomorrow and see if I can send him my chip stuff and 2 pcms to see if they are toast and if he can tell what may have killed them..."ie area of possible problem." Man ive been searching all the psd forms looking for shorted wire post...There is a bunch out there....
Post Fiend
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From: Texas
Finding a shorted wire is never fun. There's just too many dang wires if you don't have a good place to start. Don't worry about trying to figure out the fuel pump thing. That's simply a side effect of your other issue. There are circuits that don't get powered up by the PCM when there is a problem.
The possibility of a damaged PCM just makes things worse. The common issues I can think of for shorted wires are at the 42 pin connector (square box with a bolt in the middle of it over the driver side valve cover. Check the wires below the box for shorting against the valve cover, and the wires behind the box for shorting against the bracket. Wiring harness over the front driver side shock, or a wiring harness inside the steering column. The wiring to the ICP sensor or the IPR (or a loose tin nut on the IPR) can also cause no start issues, but should not cause the PCM to not power up the fuel pump.
The possibility of a damaged PCM just makes things worse. The common issues I can think of for shorted wires are at the 42 pin connector (square box with a bolt in the middle of it over the driver side valve cover. Check the wires below the box for shorting against the valve cover, and the wires behind the box for shorting against the bracket. Wiring harness over the front driver side shock, or a wiring harness inside the steering column. The wiring to the ICP sensor or the IPR (or a loose tin nut on the IPR) can also cause no start issues, but should not cause the PCM to not power up the fuel pump.
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From: Van Wyck SC
Ive looked at all those wiring connectors and the 42 pin block...I think that is where Devin had his problems....Im going to take a closer look into that area...The lower bolt on that bracket was backed way out and into the harness....I cut off the red and black tape and inspected the wires....There may be one burnt inside the insulation ....Im going to focus on that and all the plugs over near the pcm harness.... Im still kinda stuck on the cjb because the fuel pump relay and 4 others are inside there..I took it apart Thursday night and didnt see a problem...I also want to double check the key on key off power to the pcm/imd relays...I guess i should also check the pinout for the pcm for wire color and power with the key on....I may be able to rule out a few things from there....
Post Fiend
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From: Texas
I've seen a bad chip kill the same circuit. No fuel pump sound means the truck won't start. Often times the WTS light stays on when this happens also. The good news is, if it's a short to ground in a wiring harness, you can just leave the key in the on position and start wiggling wires. If you move a wiring harness and then suddenly hear the fuel pump kick on, you've found the area of the short.
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From: Van Wyck SC
Hey any idea where the aux pcm module is at...Wiring diagram shows one...It controls 2 wires in the dlc and 15 on pcm connetor bus- and 16 on the pcm connector 16....Wiring diagram calls it a APCM.... Thanks Matt
EDIT sorry im a retard::: My truck doesnt have that.... Check pin out on the pcm....All power wires have power...All grounds listed have 12.0 ohms to ground on the 400 scale....
EDIT sorry im a retard::: My truck doesnt have that.... Check pin out on the pcm....All power wires have power...All grounds listed have 12.0 ohms to ground on the 400 scale....
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From: Hoschton,GA
First off I dont know how I missed this site while looking for forums a couple of years ago..Looks like a ton of traffic on here....
So Yesterday my truck died while cruising about 35...It dropped out for a few seconds then came back to life....Pulled in to a lot and shut it off and restarted fine, pulled back on the road and it died for good....I have a DP chip "love it" so I removed it in case I had a bad connection....Still dead....Long story short I dont have power lighting the DP while it is hooked up..I check all the fuses and relays,removed the ignition switch to see if it was burned or smelled bad, it all looked good...I unplugged the fuel heater just in case ,check as many connections as possible..All my dash lights work and no tach movement while turning over...I have no power to the fuel pump...I replaced the cps with the glove box spare...From what I have been told by a fella form another site the fuel pump relay is built into the fuse box...I removed the fuse box and took it apart..Sure enough there are 5 yes 5 relays inside the fuse box soldered into a circuit board...
I check all the fuses with a test light and a visual inspection....I have some spare stuff from another project so i replaced the pcm and the idm...Still nothing....I hate throwing parts at a problem but im out of ideas...I hate to be long winded but I want to let you know what i have checked....It is a 2002 f250 7.3....
Any thoughts or ideas would be very very helpful....Is there a wiring diagram online I can reference ?? Thanks MATT
So Yesterday my truck died while cruising about 35...It dropped out for a few seconds then came back to life....Pulled in to a lot and shut it off and restarted fine, pulled back on the road and it died for good....I have a DP chip "love it" so I removed it in case I had a bad connection....Still dead....Long story short I dont have power lighting the DP while it is hooked up..I check all the fuses and relays,removed the ignition switch to see if it was burned or smelled bad, it all looked good...I unplugged the fuel heater just in case ,check as many connections as possible..All my dash lights work and no tach movement while turning over...I have no power to the fuel pump...I replaced the cps with the glove box spare...From what I have been told by a fella form another site the fuel pump relay is built into the fuse box...I removed the fuse box and took it apart..Sure enough there are 5 yes 5 relays inside the fuse box soldered into a circuit board...
I check all the fuses with a test light and a visual inspection....I have some spare stuff from another project so i replaced the pcm and the idm...Still nothing....I hate throwing parts at a problem but im out of ideas...I hate to be long winded but I want to let you know what i have checked....It is a 2002 f250 7.3....
Any thoughts or ideas would be very very helpful....Is there a wiring diagram online I can reference ?? Thanks MATT
First off I am sorry to hear of your troubles. I am guessing when the first time it died you had no tach then either? Ample voltage to the PCM is very important for the Switcher to work properly. The reason the switcher was not lit is because the PCM did not have enough power going to it. This can be caused due to not enough volatge coming from the batteries to supply the PCM with the 12 volts needed to function properly. I would check you battery voltage and alternator voltage. An alternator can have intermitten voltage issues or just suddenly die on you.(I experienced this first hand
) The PCM can still have power when a CPS goes out, so I am not sure that would be the cause, but it doesn't hurt to check it out. The only way to check for codes is to have it scanned. If there's no power to the PCM there will be no power to many things like the fuel pump.
If I had to guess, your batteries voltage is too low or there is corrsion build up on the cable contacts.
Let us know what you find out.
Diane
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From: Van Wyck SC
Hey Diane ... I have cleaned up all my battery connections and have charged up the batteries...Yesterday I checked the pin out on the pcm harness....I checked all the voltage inputs listed on the pinout diagram...All voltages were a tenth of the battery voltage and the grounds were 1.3 ohms on the 400 scale.....I did also replace the ignition switch..I had trouble once before with the radio not coming on at times....That may have been another issue but with the age and 220 on the truck it couldnt hurt....I did notice yesterday if i cycled the keys several times i would get the fuel pump to cycle on and could get my AE to connect but it was only for less than a few minutes.... Thanks Matt
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From: Texas
Have you got a thread running Greg? His next step should have been remove the chip, and if the problem persisted, leave the key on and start wiggling wiring harnesses or pulling fuses and relays while listening for the fuel pump to kick on to determine which circuit had the short.