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No crank, no start?

Tiny
LFIORE
  • MEMBER
  • 2006 HUMMER H3
  • 3.5L
  • 5 CYL
  • 4WD
  • AUTOMATIC
  • 120,000 MILES
Pulled into driveway placed into park ran inside, returned to vehicle turned key nothing, no crank, I can hear fuel pump turn in, I can hear relays click. I tested the starter solenoid, no power, I assumed it was the security bypass, but the light did not blink. I changed the crank relay no change. Checked fuses all good. What tests can I perform in sequence to troubleshoot? Thank you.
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Tuesday, April 4th, 2023 AT 4:38 AM

11 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
There are four fuses that run the system we need to check for power also there is an additional relay as well. Here is a guide to help you test for power and the starter wiring diagrams so you can see how the system works and where to test for power and grounds. Also, I would run the codes to see what comes up, you can get a CAN scanner (Controller Area Network) from Amazon.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

and

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Here is one for about $99.00 if you need it:

https://amzn.to/3ZixY4v

Here is how to check for power and ground:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check out the images (below). Please let us know what happens.
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Tuesday, April 4th, 2023 AT 9:25 AM
Tiny
LFIORE
  • MEMBER
  • 6 POSTS
I performed the test using a test light, had power at starter fuse30A, had power at PCM control relay pin 30 also, following diagram had power at run/crank relay also at batt ignition fuse 10A. Plugged in the Audel scanner received following code P0340 camshaft position sensor circuit, P0365 camshaft position sensor B circuit. Scanner also indicated modules present SAE J1 850 VPW.
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Monday, April 10th, 2023 AT 3:33 AM
Tiny
KEN L
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So, does the engine crank over (starter working) or does the engine crank over but not run? Can you please shoot a quick video with your phone so I can hear the engine cranking over? That way I can tell for sure what's going on. You can upload it here with your response.
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Monday, April 10th, 2023 AT 2:29 PM
Tiny
LFIORE
  • MEMBER
  • 6 POSTS
The engine does not crank. When I turn the key to start there is no power to the starter solenoid when using the test light.
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Monday, April 10th, 2023 AT 2:40 PM
Tiny
KEN L
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  • 47,513 POSTS
Okay, do you have a security light flashing when you try to crank the engine over? If not, I would swap out the crank relays to see if that fixes it. Here are the locations #77 and #78. Check out the images (below). Please let us know what you find.
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Tuesday, April 11th, 2023 AT 10:50 AM
Tiny
LFIORE
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  • 6 POSTS
No security light flashing, replaced start crank relay no change.
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Thursday, April 13th, 2023 AT 4:24 AM
Tiny
KEN L
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We need to do a CAN scan.
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Thursday, April 13th, 2023 AT 12:11 PM
Tiny
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  • 6 POSTS
Performed can scan, following results.
P0340 Camshaft position sensor A circuit
P0365 Camshaft position sensor B circuit
Modules present SAE J1 VPW
Monitors N/A 3
Monitors ok 3
Monitors INC 4
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Friday, April 14th, 2023 AT 3:54 AM
Tiny
KEN L
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I would use the starter wiring diagrams above to see where you are losing power when the key it turned to the crank position.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Please go over this guide and report back.
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Saturday, April 15th, 2023 AT 10:05 AM
Tiny
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Performed tests on starting utilizing test light, there was power to purple wire up until the connection covered with shrink tubing. When I moved the connection the test light confirmed power. I cut and removed shrink wrap cover and found corrosion and looks like a previous repair done poorly. I stripped wire and soldered connection. Started right up.
Thank you for the guidance.
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Sunday, April 30th, 2023 AT 7:23 AM
Tiny
KEN L
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Thanks for letting us know, we are here to help, please use 2CarPros anytime.
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Sunday, April 30th, 2023 AT 10:52 AM

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