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01 chevy impala no crank no start. no signal at crank fuse.

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have by passed security with...
01 chevy impala no crank no start. no signal at crank fuse. have by passed security with yellow and black wires. still no power at starter.
Submitted: 2 years ago.Category: Chevy
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Answered in 18 minutes by:
9/30/2015
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago
Gary
Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 17,285
Experience: 15 years GM master tech
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the pcm crank fuse in the left inside fuse box that 10 amp fuse does NOT show 12 volts at it when you hold the key to crank position ?

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Customer reply replied 2 years ago
nothing at all. have changed ignition switch and key tumbler,checked all fuses& relays,bcm conections.
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago

I that fuse will NOT show 12 volts when holding the key to crank at the ignition switch when the key is held to crank does the yellow wire show 12 volts at it testing with all the connectors plugged in ?

also does the red at that connector show 12 volts all the time ?

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Chevy Mechanic: Gary, Chevy Technician replied 2 years ago

* if *

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Customer reply replied 2 years ago
have to check, if it isn't what's my next step.
Customer reply replied 2 years ago
How long do I have to ask questions.
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago

if it is showing 12 volts on the yellow when you hold the key to crank and that fuse shoes NO volts then that yellow wire between the switch and fuse box is bad or where it connects to the back of that fuse box

if the yellow shows NO volts and the red shows 12 volts then the switch or terminals in the switch connector are bad

if the red wire shows NO volts and the big fuse in the under hood fuse box called IGN SWITCH is good and shows 12 volts at that fuse then the red wire from the switch to the under hood fuse box is bad

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Chevy Mechanic: Gary, Chevy Technician replied 2 years ago

this post has no time limit

you can always get me back through this post for FREE with any follow up anytime with this question even after you rate us here at Justanswer !

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Customer reply replied 2 years ago
There is power under hood at that fuse. I will check the rest later, I'm done for the night. thank you.
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago

ok let me know

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Customer reply replied 2 years ago
which yellow wire are you talking about? there is a lot of yellow wires under the dash. If your talking about the yellow wire at the ing switch it blows AUX fuse when tested.
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago

terminal B in the picture of the connector for the ignition switch

back probing that wire terminal from behind when holding the key to crank that yellow wire should show 12 volts

there is only one yellow wire at that connector i showed you at the ignition switch

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Customer reply replied 2 years ago
12 volts at ing switch & fuse box. yellow & red.
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago

so the yellow wire only shows 12 volts when you hold the key to crank position and the fuse crank still will not show 12 volts when you hold the key to crank ?

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Customer reply replied 2 years ago
Both show more than 12 volts, when check power at fuse nothing.
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago

ok im just being sure the yellow at the switch will ONLY show 12 volts when holding the key to crank ?

i just need to know for sure am i am sorry for asking again

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Customer reply replied 2 years ago
A little more than 12.
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago

ok great thank you

so this now comes down to that yellow wire from the ignition switch to the fuse box that has the crank fuse

you need to get to the back of the fuse box and get to this connector here C1

you need to see if the yellow wire in terminal # ***** shows 12 volts when you hold the key to crank

if it does then the terminal in that connector is bad or there is a bad connection in the back of the fuse box of the fuse box is bad

if the yellow the yellow does NOT show 12 volts when you hold the key to crank at that fuse box terminal but it shows 12 volts at the ignition switch when you hold the key to crank then the yellow wire is bad and its best to just run a new one from the ignition switch to the back of the fuse box terminal # *****

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Customer reply replied 2 years ago
The yellow crank wire at the back of fuse box does show 12 volts
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago

ok then either the terminal in the back of the fuse box or the terminal in the connector is bad or not making a good connection or the fuse itself is not making a good connection in the box or the fuse box is bad internally

you have your problem narrowed down to that

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Customer reply replied 2 years ago
Replaced fuse cleaned contacts, before replacing fuse box. how can I check transaxle to make sure that's not stopping my crank signal to starter?
Chevy Mechanic: Gary, Chevy Technician replied 2 years ago

if anything under the hood and or the transaxle was causing this issue you WOULD show 12 volts at that fuse when holding the key to CRANK position

the power is not making it to the fuse inside so it is not making it out under the hood to the transaxle

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Chevy Mechanic: Gary, Chevy Technician replied 2 years ago

how are you making out ?

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