| From | Message |
Mike J
Dodge Dakota
JOIN HERE
7/14/2006
21:35:25
|
 Subject: Before I call the tow truck
IP: Logged
Message:
I thought I'd pick the fine minds here one more time...
I have a 96 Dak 3.9 auto w/ o/d that won't start up, I first posted on this a couple weeks ago. What I've found: Not spark or fuel injectors, fuel pressure at the rail, although fuel pump runs constantly. Coil ohms out to spec. Auto shut down relay clatters rapidly when key on, as does vapor purge solenoid and something in the trans. Unhooking the 7 pin connector on the trans (located front drivers side of trans near neutral/backup switch, kinda covered by all the linkages) does stop all the clattering, and I can smell fuel now when cranking, but still no coil spark. Manually grounded the coil, nice spark to frame (off the ground), and tried, still no spark. Just what is this gadget in the trans? My Haynes manual gives "typical" diagrams, I can't match the wire colors to anything shown there. I hate admitting defeat....... Anyone? Thx!
|
cuzindoug
GenIII
7/14/2006
22:12:55
| RE: Before I call the tow truck
IP: Logged
Message:
WOW!!! Did you check the infamous splice located about 5 or so inches below the PDC? It sounds like a MAJOR electrical fudge-up. I'll have to ask my buddy to look it up on Shop Key(snapon program).
If it doesn't fit, force it. If it breaks...well...it needed to be replaced anyway.
|
joe M.
Dodge Dakota
JOIN HERE
7/14/2006
23:50:44
| RE: Before I call the tow truck
IP: Logged
Message:
yea man i'd say check the wire splice
at the under hood fuse box
need more info or help just ask
|
MikeJ
Dodge Dakota
JOIN HERE
7/15/2006
08:17:42
| RE: Before I call the tow truck
IP: Logged
Message:
Thanks, yes, I've checked the splice, it looks like new, good voltage there. Have also cleaned up every ground point I can find, swappped out the battery just to be sure, swapped the ASD relay out, reseated PCM connections. Could be the gadget in the trans shorted I suppose, or the PCM is fried causing all sorts of weird stuff.... hate to start shotgunning parts in, most times the guess is wrong, and expensive..... :-o
|
cuzindoug
GenIII
7/15/2006
10:06:25
| RE: Before I call the tow truck
IP: Logged
Message:
Have you tried the self-diagnostic test? on-off-on-off-on with the key (do not start) and count the MIL blinks. You might get lucky and it will tell you what the problem is.
The tranny clatter noises are probably just the solenoids (TCC, etc) engaging/testing, but with the short, they are erratic.
Short troubleshooting:
Disconnect the coil input wire and turn the key on, and see if the problem is still there.
If the problem is still there, disconnect the purge solenoid for the EVAP canister, and check it again.
If that doesn't fix it, go one-by-one through the individual PRE-startup circuit and disconnect them one at a time, re-connecting them when you have tested and are sure they are not the problem.
PRE-start-up ckts include but are not limited to:
EVAP system
Fuel pump module
Ignition coil
Lighting
etc
After you have check these system/components, check the start-up and run circuits one at a time:
Transmission
IAC
MAP
TPS
CPS
etc
Also, run down the individual wire harnesses, and check for chaffing/exposed conductors/charring/etc.
I wasn't able to get ahold of my buddy with that program, so I am just running down my own electrical troubleshooting experience. It is sometimes slow, but you will eventually find the problem:)
If it doesn't fit, force it. If it breaks...well...it needed to be replaced anyway.
|
zzark
*GenII*
7/15/2006
10:26:18
| RE: Before I call the tow truck
IP: Logged
Message:
Have you tried the scanner when there was no chattering?
Stop the chatter.
Disconnect neg battery.
Reset the PCM by turning the key to start and hold for 30 seconds.
Connect neg battery.
Connect scanner.
Results??
zzark
|
Mike J
Dodge Dakota
JOIN HERE
7/15/2006
15:02:48
| RE: Before I call the tow truck
IP: Logged
Message:
cuzindoug & zzark:
Been through all that, no blinks out of the check engine light when clattering or not. Same with scanner, all it will give me is the crazy eights flashing clattering or not. Accoeding to scanner manual, this means either the scanner does not recognize the PCMs protocol, or the PCM is dead and unable to communicate. Only way to stop the ASD clatter is to pull that 7 pin connector from the trans, have disconnected EVERTHING I could find one at a time. I will have to try that PCM reset zzark suggests on Monday when I can borrow that scanner again, I had tried to clear it using a different sequence I read on this board somewhere. Thanks, more results as I can try.
|
JR
Dodge Dakota
JOIN HERE
7/15/2006
20:59:58
| RE: Before I call the tow truck
IP: Logged
Message:
Every time I have had a no spark problem it was the pick-up coil in the distributor>
|
zzark
*GenII*
7/15/2006
21:14:11
| RE: Before I call the tow truck
IP: Logged
Message:
Mike J,
You definitely need to reset the PCM! (with NO chattering)
I would also leave the neg battery cable OFF for 20-30 minutes. Do the key turn too.
If you don't get any different results after the PCM reset, I'd say the PCM is toast.
If you get another PCM, install it with all sensors, etc. disconnected. Connect each one at a time to see if any are causing a problem. You don't want to damage another PCM.
zzark
|
cuzindoug
GenIII
7/15/2006
21:14:34
| RE: Before I call the tow truck
IP: Logged
Message:
Do you have a salvage yard nearby, or a buddy that would let you borrow their PCM for a test?
Blame it on the gremlins:)
If it doesn't fit, force it. If it breaks...well...it needed to be replaced anyway.
|
Mike J
Dodge Dakota
JOIN HERE
7/17/2006
19:09:11
| RE: Before I call the tow truck
IP: Logged
Message:
yeah, I don't know. Tried scanner after following above PCM reset instructions, still just flashes the "8888" error. Also, battery has run down overnight. Guess I've had a good whippin' over this one.
|
zzark
*GenII*
7/17/2006
19:27:27
| RE: Before I call the tow truck
IP: Logged
Message:
At least you gave it your best effort.
Hey, why did the battery run down??
I still think you have a shorted wire.
zzark
|
Mike J
Dodge Dakota
JOIN HERE
7/17/2006
20:53:26
| RE: Before I call the tow truck
IP: Logged
Message:
yeah, something may be shorted, I've looked at wires high and low, found nothing. It didn't run down over the weekend, I'm trying to remeber if I shut the hood last night or not... duh! lol Thanks for the help all, I'll post a follow-up after repair, something y'all can file away for future reference!
|
zzark
*GenII*
7/18/2006
21:12:24
| RE: Before I call the tow truck
IP: Logged
Message:
The problem with going to a shop or the dealer is...
unless they have someone really really good, he won't do anything you haven't already done. And he will charge you for it.
The only advantage is if they have parts they will TRY, without charging you, until they find the bad part. Such as the PCM.
Goodluck
zzark
|
Mike J
Dodge Dakota
JOIN HERE
7/25/2006
19:12:10
| RE: Before I call the tow truck
IP: Logged
Message:
Hey, I promised you guys a resolution to this, so here goes! $70 tow and $120 labor charge later the dealer traced down a broken wire in the harness supplying the camshaft sensor. Glad I didn't start shotgunning this thing. Several of you guys were right on with the wiring issue and pickup coil. Anyway, the tech was sharp and had the right equipment to diagnose. And an honest dealership to boot, they could have charged me for anything and I'd have been none the wiser. So thanks to all, file this one for future reference! Oh how I long for the carburated days!
;-)
|
zzark
*GenII*
7/25/2006
20:59:47
| RE: Before I call the tow truck
IP: Logged
Message:
GREAT!
And thanks for the feedback.
zzark
|
cuzindoug
GenIII
7/26/2006
11:31:23
| RE: Before I call the tow truck
IP: Logged
Message:
An honest dealership!!!??? What's the world coming to:)
Glad you got it fixed!
If it doesn't fit, force it. If it breaks...well...it needed to be replaced anyway.
|
| | P 1 |
|
Post a reply to this message:
Username Registration: Optional
All visitors are allowed to post messages
|
