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changed crank shaft sensor, still no spark no start

leah delozier

By leah delozier
in Ask A GM Technician

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leah delozier New Member

leah delozier

Posted
Posted

Hello, I have a 1999 chevrolet silverado 1500 and I was driving down the road and it just died. We hooked it to a computer but it wouldn't connect with the PCM. Tested the voltage on the crank sensor and it showed .064 volts so we changed the sensor. It will turn over but won't fire or start. The security light is flashing and we have read where that may be a problem, like with the pass lock, and also have read that we need to possibly do a crankshaft relearn. The battery keeps running down also. Any ideas or tips on this would be greatly appreciated.

8.1HD/ALLISON Senior Enthusiast

8.1HD/ALLISON

Posted
Posted

I would start with charging/ testing the battery. And then move to the security light next. If the light is flashing there is a problem. Also check pcm fuses, power and ground wires.

 

Sent from my LGL86C using Tapatalk

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted

+1

 

If you cannot connect to the pcm with a working scan tool, you MUST fix that first. As already suggested, check all fuses and all grounds. The battery must be in good shape as well.

 

I have seen batteries with a dead cell still crank the engine over. Problem with that is the battery voltage is 11 just sitting there. This particular battery was one of those with 900CCA back when they first started selling those batteries at a fair price. It also was brand new, and defective. You want something that will screw up your troubleshooting skills, try that one. Charged the battery before installing, checked voltage, it was over 12v, installed and engine cranked great. No need to check voltage right? The voltage we got initially was the surface charge. As soon as the key was turned on, it dropped to right around 11(this was hours after we installed the battery and someone suggested we check voltage)..

Jsdirt Senior Enthusiast

Jsdirt

Posted
Posted

That sounds like it was a fun day of troubleshooting! :lol: Been a long time since I've had one dead out of the box like that. It's a wonder I have any hair left ...

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted

That sounds like it was a fun day of troubleshooting! :lol: Been a long time since I've had one dead out of the box like that. It's a wonder I have any hair left ...

 

It was one those ones where whenever someone would come over to give me a hand, I would start by saying "Can't be the battery, its new and fully charged". It ended up being the job that taught me something that has saved me many times. Being "new" just means it is clean and easier to change second time around.

Customer was only charged for the new battery as it was actually the fault in the first place.

lee123 Enthusiast

lee123

Posted
Posted

whenever i buy a new part, i ask to test the old one and new one. dont know alot,but if it has an external ignition module, you may want to have it tested, or listen to the others; which is probably a better idea

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