00 Silverado No Start
Thread Starter
Teching In
Joined: Oct 2013
Posts: 9
Likes: 0
From: Kansas > NE FLorida
00 Silverado No Start 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
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
To get proper diagnosis in no start problems you should clarify if the engine wont crank (turn over) or it will crank but not fire. Big difference between figuring out the problem with each scenario.
Thread Starter
Teching In
Joined: Oct 2013
Posts: 9
Likes: 0
From: Kansas > NE FLorida
Running ! Sorry, it would crank but no fire or fuel. 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 does need a BCM, does the new BCM need to be flashed with the correct VIN ? I know the ECM does not have to be, but BCM ?
If it does need a BCM, does the new BCM need to be flashed with the correct VIN ? I know the ECM does not have to be, but BCM ?
Last edited by EvenSteven; Dec 14, 2015 at 05:40 PM. Reason: .
