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Gary
Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 15704
Experience:  15 years GM master tech
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2003 Chevy van will no crank

Customer Question

2003 Chevy van will no crank
Submitted: 11 months ago.
Category: Chevy
Expert:  Gary replied 11 months ago.

I am sorry your having this problem is the battery tested good and are both battery cables clean and tight on the battery ?

what size engine is in this van ?

do you have a multi meter or test light on hand ?

Customer: replied 11 months ago.
Battery new and good, 350 yes I have meter
Expert:  Gary replied 11 months ago.

5.3 engine ?

if so if you put your fingers on the relay called starter in the under hood fuse box do you feel that relay click with your fingers everytime someone holds the key to the crank position ?

Customer: replied 11 months ago.
I can jumper under relay and it will crank but won't start
Expert:  Gary replied 11 months ago.

can you see if the fuse called crank in the under hood fuse box will show 12 volts at it when you hold the key to crank position ?

with the key ON is the check engine light lit up in the dash ?

Customer: replied 11 months ago.
No voltage
Customer: replied 11 months ago.
Engine light not on
Expert:  Gary replied 11 months ago.

can you see if the fuse called IGNA a 40 amp fuse in the under hood fuse box shows 12 volts on both sides of that big fuse testing it in place through the little openings in the tops of that fuse ?

Customer: replied 11 months ago.
Will do.
Customer: replied 11 months ago.
Ign e
Expert:  Gary replied 11 months ago.

IGNA

are any of those big fuses blown ?

Customer: replied 11 months ago.
No
Expert:  Gary replied 11 months ago.

ok does the fuse called IGNA show 12 volts on both sides of it ? testing it with the fuse in place ?

Customer: replied 11 months ago.
I will have to take glass top off one sec
Expert:  Gary replied 11 months ago.

ok

Customer: replied 11 months ago.
voltage both sides
Expert:  Gary replied 11 months ago.

ok last check with the key ON does the fuses called PCM IGN1 and IGN0 show 12 volts at both with the key ON ?

Customer: replied 11 months ago.
Ing 0 has voltage both sides and ing I has no voltage either side
Expert:  Gary replied 11 months ago.

IGNb a 40 amp shows 12 volts on both sides ?

if so then the issue here is a bad ignition switch not powering those fuses when the van is turned on replacing the ignition switch should restore power to those fuses and the computer which should be lighting up the check engine light in the dash and when its not the computer is dead

'the computer is dead because that fuse ign1 has no power when the key is ON

please do not forget to rate us here as i do NOT get credit for my work until you rate us here at Justanswer

Customer: replied 11 months ago.
I have power on that fuse now but still no crank. Engine light is on
Expert:  Gary replied 11 months ago.

was a fuse blown ? how did we get power back all of the sudden ?

Customer: replied 11 months ago.
There is a relay under the dash that powers a lift and I by passed it. Pink wire going to switch was running through relay. Now it is not
Expert:  Gary replied 11 months ago.

ok so now will the fuse called crank show 12 volts when you hold the key to crank ?

Customer: replied 11 months ago.
It will start if I jumper under relay, yes I have tried 3 different relays
Customer: replied 11 months ago.
Crank fuse has voltage both side
Expert:  Gary replied 11 months ago.

ok do you feel the relay click when you hold the key to crank or not ?

Customer: replied 11 months ago.
I am by myself
Expert:  Gary replied 11 months ago.

ok take the relay OUT and with the key ON do 2 terminals in the box the relay plugs into show 12 volts ?

Customer: replied 11 months ago.
Expert:  Gary replied 11 months ago.

ok so the only 2 things left are the other 2 terminals which one of them goes right to the starter which is the one you jump to make it crank and then the last terminal which should be a ground from the computer when the key is held to crank

the odds are it is the ground from the computer that is missing causing the relay not to work which is caused by an internal fuse box failure or the yellow/black wire from the fuse box to the computer being bad or the computer itself is bad

there is nothing more it can be causing this problem

Customer: replied 11 months ago.
Ok
Expert:  Gary replied 11 months ago.

please do not forget to rate us here as i do NOT get credit for my work until you rate us here at Justanswer

Expert:  Gary replied 11 months ago.

how are you making out ?

dont forget to rate us here at Justanswer as i do not get credit for my work until you rate us here

Customer: replied 11 months ago.
van started 5 or 6 times in a row then stopped cranking again.
Expert:  Gary replied 11 months ago.

there has to be a bad computer or bad wire from the computer to the under hood fuse box or the fuse box internally is bad

make sure the connections on the starter are clean and tight and the grounds on the engine

Customer: replied 11 months ago.
I have 12 volts on the purple wire going into computer in the crank position
Expert:  Gary replied 11 months ago.

ok but NO 12 volts at the terminal at the relay in the box when in crank position ?

Customer: replied 11 months ago.
What color is the wire from the fuse box coming out of the computer
Expert:  Gary replied 11 months ago.

yellow/black

you can always get me back for FREE through this post with any follow up anytime with this question

if you have any questions please ask as i do not get credit for my work until you rate me here

Customer: replied 11 months ago.
broken y/b wire from computer. Repaired everything is good. Thanks
Expert:  Gary replied 11 months ago.

great job

dont forget to rate us here

if you have any questions please ask as i do not get credit for my work until you rate me here

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