DID COMPRESSION CHECK AND NOW HAVE NO TACH ...

  • Tiny
  • david warren
  • 2003 Nissan Altima
  • 75 miles

Did compression check and now have no tach signal. Car wont start without it. Any suggestions?

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Tuesday, October 23rd, 2012 AT 3:54 AM

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  • Tiny
  • KHLow2008
  • Expert
  • 41,997 posts

If you have a scan tool, check for trouble codes. No tach signal could mean the crank sensor is not sending signals to the PCM.

Recheck the work done while testing the compression. A wireharness connector could be not securely plugged in. Ensure any ground circuits removed are secured.
Have you checked for sparks anf eul pressure? Did you check for b, own fuses?
Is the immobilizer triggerred?

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Tuesday, October 23rd, 2012 AT 5:22 PM
  • Tiny
  • david warren
  • Member

I checked all fuse in car and engine compartment. The vehicle started with ether but ran horribly. What is the immobilizer?Is it the remote security controller?Thank you for your input KHLow2008

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Wednesday, October 24th, 2012 AT 1:19 AM
  • Tiny
  • KHLow2008
  • Expert
  • 41,997 posts

Not the remote, that is the keyless entry and anti-theft. The immobilizer is another security system that prevent engine from starting. There should be an LED or Key symbol indicator for this.

The fuel injectors are not pulsing and this can be due to the cam sensor. Check its wire harness connector. Ensure it iplugged in snugly and tight.

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Wednesday, October 24th, 2012 AT 12:41 PM

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