I sure wish that were the case.

CM

 

I was not going against what you said, I was just saying that I know an ASD event does not cause a nobus, but didn't know if a nobus causes and asd event due to lack of communication. Was hoping someone would answer that.

I did throw a bs flag along with stands2p. I just found it really hard to believe that you wouldn't feel something funny when tightening the bolt down if there was indeed a wire under it, expecially with the OP's mechanical experience. Kind of like the funny feeling you get when you know your going to break a bolt. Either way, those wires should have been up and out of the way.



Did the OP really pinch a wire, sure as hell could have and probably did, but again I just had a hard time believing that you wouldn't have noticed on assembly. Either way man, as long as the truck is fixed for the owner, thats all that matters.

 

I agree.

CM

 

Wires are wires, get a piece of the metal in a wire to ground and every thing breaks. It doesn't have to be the entire wire to get under the intake, just a small piece is enough, and with wires, they are small, and some times you just can't tell that its being pinched. It happens.

But as you two said, its fixed, so that's all that matters.

 

It was just the edge of the wire that was caught under the head. The bolt had a washer type head and it just caught the edge. Also consider, like ai Previously mentioned, that with the engine sitting so far back under the cowl ( totally unlike my 60s and 70s F100s , that I was reaching back and tightening. I really didn't see what I was tightening as I was doing it. So it slipped under and I didn't know. It flattened almost perfectly it was such a small pinch, that it wasn't obvious. Trust me. If for nothing else, I hope this helps someone and shows them how careful you must be Hey . and unlike most directions, I didn't remove the radiator or fan for extra "standing" room. Perhaps that added to be troubles as I laid on the engine literally when I needed to work back that far.

 

What crap?because iam questioning you on the incorrect info within some of your posts?in every thread you have posted in you have corrected members on the info they have posted.turn it around on your info and we are burned at the stake and hated on for questioning the validity of the info........do as i say,not as I do?
theres only one master sensor and that’s the crank,hence the reason for the asd to monitor the function of this sensor.I will say if it goes to ground externally or internally the asd will activate and cut the coil and injectors 12v supply and sets a DTC and thats it.all other sensors are on line working.the cluster is not effected from a asd event.only one sensor can trigger an asd event and thats the crank.you(CM)stated that ANY sensors 5v supply went to ground it will kill the entire efi,sensor and cluster system as a failsafe which is false.so,if the tps,map,iat,ect,o2,VSS,trans ps,cmp,oil ps, ever went to ground it would kill all those systems? Un-true.that would be a safety issue and the NHTSA would be all over it.driving down the road and ANY 1 of those sensors ground out killing the entire efi /cluster/sensor system would cause a wreck if everything went dead.a sensor will/has/can go to ground internally and that will not kill the entire efi /cluster/sensor system.it will however set a DTC with a definition of “open or short detected in ……circuit“.every one of those sensors has a DTC related to an “open or short circuit".
Lets look at that link/post alittle closer.the woman with the problem states that the truck and gauges both die when driving.husband wiggled some wires on the motherboard which is most likely the pcm and the truck was back running/gauges working.how this tech came up with a crank/cam sensor going to ground is beyond me.that would point me to a bad connection at the pcm.oh and hes not a dodge certified tech.hes ASE which is nothing special.been there done that.hes a service manager for bridgestone/firestone with a work history from sears,tire kingdom.discount tire.no dealerships or shops experience.sounds like a tire guy to me.to be real I wouldn’t want a tire guy diagnosing my truck.

 

Ok, well then, you don't think that grounding the five volt supply for the camshaft sensor will cause a no bus, or an asd event? I invite you to try it. Considering that both sensors draw their five volts from the SAME TERMINAL on the pcm....... grounding one, will ground them both. So, while no SIGNAL from the crank sensor might trigger an event, grounding the power feed from either, is grounding the power feed for both. Thus, an asd event.

 

This is incorrect and, if I may, I would like the opportunity to present my case.

For those of you who have the 2001 manual, please turn to page 470 where, it lists which sensors are off the primary and secondary five volt supplies at the PCM. This can also be found in the Haynes manual as well under engine control systems.

Primary five volt supply:
-CKPS
-CPS
-MAP
-TPS
-VSS*

Secondary five volt supply

-Oil pressure sensor
-VSS*

* Some vehicles had the VSS sharing the same supply as the CKPS and CPS.

Actually, it's true for, if and when any of those sensors from that list go to ground, it's going to have the same exact affect as the CPS shorting out the five volt supply did. WHY: it's shorting out a shared supply that feeds the CKPS, CPS, MAP, TPS and VSS*.

I can't find where I said ANY sensor in this thread and, if I did indeed write it that way, it was an error and I will gladly admit to an error along with fixing it. I'm sure I've typed things incorrectly at times and even mixed up acronyms (OBD, DRB) on occasion, but, from what is seen here, it sure looks to me like there's an abundant amount of errors in this thread that I did not have anything to do with.

Technically, it's not questioning. That's the problem. You imply and make statements that it's all BS / lies. To me, this - that, is not a question, it's implying something and, from that alone, is what created animosity.

An example of a question is, Are you sure that it was the CPS that was pinched?" or are you 100% sure that it was running fine before it died?

Actually, the ASD relay does nothing in terms of monitoring anything let alone the function of the CKPS. It's a switch.

If you look at the wiring diagrams for engine control system and note that PIN 85 of both the ASD relay and the fuel pump relay (PIN 85) are tied together and controlled via by the PCM PIN 15, the ASD relay will interrupt power to the fuel pump, injectors, ignition coil and heated O2 sensors. This, is the EFI system. Thus, when I say, take down the entire EFI system, this is what was meant.

In case of a NO BUS, I believe I stated many times it was due to shorting out the five volt supply. (primary five volt supply) which, will trigger an ASD event- (not to be confused with triggering the ASD relay) just like what happened in this case here with the pinched wire.

The sensor wire had shorted thus, shorting the primary supply and, as a result, the EFI system was dead as was the cluster. He verified that he had no power to the ignition system or the fuel pump, along with the OBD port failing to communicate with the PCM along with a NO BUS error message being displayed.

The short was later discovered and removed, all systems came back on-line thus resolving the issue and returning it to it's owner.


CM

 

Ill kill 2 birds with 1 stone and apply my response to the other user who states the same response.yes those 4 sensors share the same 5v supply but off a parallel circuit.all voltage supply circuits are wired in parallel.why do they use a parallel circuit and not a series.ill tell you.in a parallel circuit there is more then one path for the current to flow and the voltage drop if any is the same at each sensor/device , furthermore if one sensor/device fails or shorts to ground it will not effect the remaining sensors/device.headlight are a great example of a parallel circuit.if one light goes the other still shines bright as day.CCD is another example as well.voltage drop is another concern.in a parallel circuit the voltage will stay constent through out the circuit.meaning 5,10,12volt supply will be seen at each device within the circuit with minimal voltage drop.in a series circuit theres only one path for current to flow.if theres a short/failed device in this type of circuit then all devices within the circuit will be inoperative furthermore a voltage drop at each device will be measured.this voltage drop is in direct coralation with the resistance of each device within the circuit.OHM'S LAW....AGAIN....furthermore this type of circuit can/will cause a certain amout of heat build up and can potetional cause a fire.JOULE EFFECT…….5v circuit suppling 4 devices in this case sensors and each sensor receives 5v making it a parallel circuit.this parallel splice can be found in the engine harness.
Again this is a parallel circuit coming off the joint connector within the PDC and if that joint connector should fail or short the PDC will need to be replace.we know this to be correct as we have 12v into the circuit(joint connector within PDC) with 12v out of the circuit to each device with minimal voltage drop measured at any 1 device within the circuit.an ASD EVENT ONLY KILL POWER TO THE COIL AND INJECTORS as stated in the FSM.all anyone needs to do is pull the asd relay or unplug the crank sensor.that will trigger an event,with key on the pump will be energized.I have grounded out a few 2bar maps wiring it to the new connector but never a cam sensor.this error on my part killed the maps.set a DTC but all other systems were a go including fuel pump and cluster.

 

Well if the two wire gray harness is indeed the wires for the cam sensor, then I believe my situation is actual proof that the cam circuit will cause a no bus situation. As I stated, as soon as I removed the pinched wire from the bolt head, the fuel gauge shot up and I just knew it was going to start. And it did.