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Ok no start command to starter howeve if power is applied to

Customer Question
repay starter turns. Second issue...
Ok no start command to starter howeve if power is applied to repay starter turns. Second issue no fuel pump at key on but if power applied a relay pump works. Customer had shut down intermittent gave it to chey replaced intake customer repeated complaint at start no starter no fuel pump acts like security system ingaged? Crank fuses changes from ground to power. Computer was replaced crank sensor replaced.
Submitted: 1 year ago.Category: Chevy
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Answered in 5 minutes by:
3/18/2016
Chevy Mechanic: Mike S., Chevy Mechanic replied 1 year ago
Mike S.
Mike S., Chevy Mechanic
Category: Chevy
Satisfied Customers: 7,645
Experience: ASE Certified Master Technician
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Is there a security message or light on or flashing? If so, can you try a different key?

If not, let me get the wiring diagram and see if this can just be a single fuse blown.

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Chevy Mechanic: Mike S., Chevy Mechanic replied 1 year ago

Here is the wiring diagram for the starter.

Here is the fuel pump relay,

If the fuel pump fuse 12 is hot all the time, it's most likely the signal that is missing from the pcm. First check all of those fuses.

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Chevy Mechanic: Mike S., Chevy Mechanic replied 1 year ago

Can you explain what you meant by "Crank fuses changes from ground to power"?

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Customer reply replied 1 year ago
Ok if I put a ground on relay ground starter run at key on
Chevy Mechanic: Mike S., Chevy Mechanic replied 1 year ago

I have no idea what that means.

Anyhow, did you try a new starter relay and/or a fuel pump relay, also?

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Customer reply replied 1 year ago
It's appears that the ground is missing from the start relay and the fuel pump relay and other devices as I turn heater blower and didn't rear a thing
Chevy Mechanic: Mike S., Chevy Mechanic replied 1 year ago

Well then, the fuel pump relay ground is G102 and the starter relay ground is not grounded actually. It goes to the PCM.

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