99 dodge 2500 5.9 magnum engine. I bought this truck drove it for three days and one day it stopped starting. Before i bought the truck i checked the codes and it had no codes. One day i went to change the ect sensor the battery hold down and the tensioner pulley. After that the truck would not start. Then checked the codes and it threw 5 codes: tps below 5v, map below 5v, ect low volt, p0112, and p1492. After that i checked every ground and sanded them down. checked fuel pump, spark plug wires and distributor everything is fine but still no spark. so i changed my crank pos sensor and they also did not fix the problem. checked the wiring to my tps map and coil connectors and they are all not reading any volts. Please help me im so ****ing pissed that i cannot start this truck and have no idea what's going on.

 

is the PCM getting power? All the five volt sensor get their signal from the PCM.

 

I understand that but i don't really know how to check it properly i've been trying to find a diagram of the pins on the connectors to figure out if theres a wiring issue between the connector and the 5v sensors. Thank you for replying i've been trying to reach of to multiple people but nobody has been able to help!

 

Look at the service manual here.

 

Ive been looking for the past hour what exactly am i looking for? Somebody said on one of these forums that you can't check to see if the pcm is getting power?

 

I'm checking all the pinouts to all the sensors that are having problems right now

 

I saw the 5v output that is connected to the cps, tps, map, etc is only getting .83v i was wondering maybe if their was a bad connection somewhere in the splice. But i do not know where the splice is.

 

The pcm has constant 12V and an input from the ignition switch so that's at least two you can check. I seen one 5v supply so they must power them all from it. When you tested it was the ignition on? All the info is in the manual.

 

Alright sorry it took me awhile to respond i had to take a break from it but i tested the pcms voltage supply (12v) it is getting powered then i tested the 5v supply and everything works just not getting the 5v it needs i read in the service manual it was connected to the "junction block" maybe theirs a short or something their? Also to answer your question yes the ignition was on when i tested it!

 

Is the fuel pump priming when you turn the key to on? Is the asd relay working?