hay guys. little history on me. im a small motor teck trained in the old ways. none of this computer crap. meaning i can 95% of the time tell you what is wrong just by listening to it run. but i will admit when im wrong. here is the story. the van was running rough so i got it checked out. found that the cat was plugged. so i got everything from the cat back replaced. after that it worked perfect. 2 hours after i picked it up it quit died. sent it back to the shop and they have spent 5 hours on it and all they said was "we were getting 5 volts on the system but when we buy pasted it we got 12 volts." dont ask me what system cus they would not tell me. trust me i spent 2 hours yelling at them trying to find out what system they buy pasted. so i checked spark and compression. all cylinders were between 150 and 180 psi on a compression tester. with readings that high i figer a leak down test was not needed. but when it cam to spark. i got nothing.

plugs? good.
plug wires? good.
coil? the book had no info in resistances. but seemed good compared to 2000 specks.


i have a innova 1003e can obd2 diagnostic tool. before all this i had a camshaft and O2 code. they cleared the computer and did there thing. now i got...

P0123 generic throttle/pedal position sensor A circuit high input
P0118 generic engine coolant temperature circuit high input
p1193 chrysler IAT circuit high
p0509 generic idle air control system circuit high

i have herd that the fuel pump circuit could be bad but i swopped relays and even got new ones. i unwrapped all the wires and none were bad. it took me three days 8 hours a day to test all wires. but im not ruling them out. if anyone has knows anything i have not checked let me know.

 

if im not the only one with this problem. can i get a link to there posts?

 

Well, on these Van, most of the time the failure is the Power Distribution Center. It tend to get corroded out and short everything together. Lift it up and inspect the connectors. If you find a lot of Green and orange powders, you probablyt need a PDC.
There are also problems with the Wiring Harness routed at the Back of the Engine, behind rear valve cover tend to chaff off and short everything together too, take a look at it.
Also look at the wiring loom under the battery tray. sometimes you get battery acid dripping down there and destroys things.

if nothing obvious is found, the conventional way to test this is check you 5 volt reference, unplug something like the TPS, stick a Meter into the 5 volt circuit, see what you get. You should have 1 wire reading 5 volt , 1 ground, and one signal(which should read nothing) as you shop say. If they are getting 12 volt, your wiring harness is shorted somewhere in the engine bay, it is the matter of Disconnecting stuff one at a time to find the problem area.

 

ok. i checked all the wires again. dose not hurt to do that. i cheached the plugs under the PDC. there was a bit of green powder but not a lot. cleaned them and used dielectric grease. checked the sensor volts and got...

4.8v air temp sensor.
4.8v TPS
4.3v and 8.2v out of the camshaft sensor

as for the crank sensor. i found it and got it unplugged but could not get to it with the meter.

as i have read. if ether the camshaft or crankshaft sensor goes bad. it will trip the ASD relay. when the cam sensor was unplugged it tripped the relay. but after plugging it back in and turning the van off and back on. it did not trip when the crank sensor was unplugged. just letting yo guys know.

 

so you have spark in all wires? Time to check if you have injector pulse. If you have both one good thing is to check fuel pressure...might be a bad pump

 

Have to pull a spark plug out and look? are they fuel soak?

Well, since you got an Innova scanner, that would make things A LOT easier.
your problem right now is what? crank no start? or start, runs rough and die out?
You can check all data in your scanner. TPS, read the data, and slowly depress/release gas pedal, see it change.
all the TEMP sensor, just read the value, any of them out of wack?
Idle air control wise, you don't care about it, car should run without IAC motor if you try to start the car with throttle slightly open.
Crank sensor, Just look at Engine RPM data as you crank the engine over, it should read 150-250 RPM. if you have that, crank sensor is good.
CAM sensor, ignore it, simple unplug it, car will run without CAM sensor, but it will have a LONG crank time.

To check ASD relay is fairly simple, go to the coil pack, check Pin 2, BR/WT wire for 12 volts. Or maybe just check all pin, 1 of them should have 12 volts. the other 3 wires going to PCM as ground.

And if you have Fuel, Spark, and Compression, ur problem is probably a plug exhaust AGAIN, or flooded cylinder. Something could be causing the PCM to throw too much fuel into the engine, and flood the cylinder and plug the exhaust. Like a Bad O2 sensor, or shorted/leaking injector, who knows...

 

did anyone figure this out? because i have same exact codes and everything