EvenSteven

My truck was running fine, other then an occasional no start to where would have to try 2 > 4 times to start first thing in the AM ( usually when cold outside, 225K miles ). A few months back, while driving on interstate the Security lite came on and truck died a couple times within a couple weeks. Coasted to side of road and restarted to drive home with no other problems. Though this has not happened for a couple months. This Saturday morning, it started right up. Though later in the AM, NO Start, and would not start after many tries.

I thought the fuel pump was bad, and was under warranty so replaced > No start. I checked the fuel pump relay, and come to find out a friend who was helping me installed it Backwards. Won't ask for his help anymore ! Installed correctly and No start. Removed the relay and can jump from 30 > 87 and bingo, Fuel pump comes on. Tried starting and No Spark. No voltage on Pin 85 while turning on Key for fuel pump relay.

I think this is connected to the Security lite, and or the possibility that when the Relay was installed backwards, it zapped the ECM ?

I'm going to OHM out pin 86 ( Relay Ground ) to verify a good ground. If not good, I'll check the grounds on the back of the engine, as according to diagrams is where they go.

Thanks for any advice

darkirish63

iTrader: (5)

Ignition switch? Not the key barrel but the switch on the opposite side of the steering column that relays voltage info throughout the vehicle. I had one go out and it caused the transmission to go nuts...never know.

EvenSteven

In investigating, found a couple wires under the fuse block under the hood that had rubbed together. Also the main power feed to the fuse block was almost broken in half ? Must a been from vibration.... Also a possible loose / dirty connection on the BCM module. Now it will start and run. Time will tell if it's fixed....

If it do need a BCM, does it have to be flashed to the VIN ??

Wolftrk99

iTrader: (5)

Yes the bcm will have to be reflashed, broken wires typically dont fry computers though, just cause signals to not be received