Engine cranks, but will not start

Tiny
LARRY BLUM
  • MEMBER
  • 2004 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 154,000 MILES
Battery dies, installed a new battery and everything worked fine. A day later everything went haywire. Horn started blowing on its own, One of the rear windows went down on its own. Rear wiper turned on, on its own. Found a place to park it (in front of an auto parts store, how lucky was that?). Shut it off, and tried to re start it and nothing. Replaced the battery again, and this time nothing happened. I was told that security locked out. Went through and cycled the key as instructed and it allowed the engine to turn over. That is where I am now. Engine turns over fine, but will not start up.
Friday, April 5th, 2019 AT 9:41 AM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

Can you hear the fuel pump run when you turn on the key?

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Does the tachometer move up a little while cranking?

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Does it have any codes?

Roy
Was this
answer
helpful?
Yes
No
Friday, April 5th, 2019 AT 12:07 PM
Tiny
LARRY BLUM
  • MEMBER
  • 3 POSTS
Yes, I can hear the fuel pump, and the tachometer does move a little when cranking. It jumps up to right below the 0. No codes at the moment. I did notice that even after doing the ignition cycle procedure to get the engine to turn over, the security light is still on.
Was this
answer
helpful?
Yes
No
Friday, April 5th, 2019 AT 12:44 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Did you do the ten minute reset procedure for the security system?

Procedure below.

Roy

Learn Procedures
There are two available methods to perform the programming procedure:
- A 10 minutes procedure which requires a Tech 2 and a techline terminal.
- A 30 minutes procedure which does not require the use of any tools.

10 Minute Learn Procedure

Tools Required
- Tech 2
- Techline terminal with current SPS (Service Programming System) software
1. Connect the Tech 2 to the vehicle.
2. Select "Request Information" under "Service Programming".
3. Disconnect the Tech 2 from the vehicle and connect it to a techline terminal.
4. On the techline terminal, select "Theft Module Re-Learn" under "Service Programming".
5. Disconnect the Tech 2 from the techline terminal and connect it to the vehicle.
6. Turn ON the ignition, with the engine OFF.
7. Select "VTD Re-Learn" under "Service Programming".
8. Attempt to start the engine, then release the key to ON (vehicle will not start).
9. Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF (the vehicle is now ready to relearn the Passlock(TM) Sensor Data Code and/or password on the next ignition switch transition from OFF to CRANK).
10. Turn OFF the ignition, and wait 5 seconds.
11. Start the engine (the vehicle has now learned the password).
12. With the Tech 2 (scan tool), clear any DTCs.

30 Minute Learn Procedure
1. Turn ON the ignition, with the engine OFF.
2. Attempt to start the engine, then release the key to ON (vehicle will not start).
3. Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF.
4. Turn OFF the ignition, and wait 5 seconds.
5. Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes (the vehicle is now ready to relearn the Passlock(TM) Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK).

IMPORTANT: The vehicle learns the Passlock(TM) Sensor Data Code and/or password on the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.

6. Start the engine (the vehicle has now learned the PASSLock Sensor Data Code and/or password).
7. With a scan tool, clear any DTCs if needed (history DTCs will self clear after 100 ignition cycles).
Was this
answer
helpful?
Yes
No
Friday, April 5th, 2019 AT 12:49 PM
Tiny
LARRY BLUM
  • MEMBER
  • 3 POSTS
I did the thirty minute learn procedure. The light never went off. It did allow the engine to turn over. Just wouldn't start any more.
Was this
answer
helpful?
Yes
No
Friday, April 5th, 2019 AT 4:17 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, then you have a failure in the security system.

Do you have a scan tool that can read the security system to see if the module is working?

Roy
Was this
answer
helpful?
Yes
No
Friday, April 5th, 2019 AT 4:19 PM

Please login or register to post a reply.

Sponsored links