89 1/2 TON SUB 4X4 5.7 CHECK ENGINE LIGHT WONT COME ON

  • Tiny
  • Csmo
  • 1989 CHEVROLET SUBURBAN

Bulb was burned out. Replaced with 4x4 indicator bulb and it still dont come on. One side of socket does get power. Otherside does not but if I put my test light on it then bulb comes on. Any ideas?

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Sunday, November 27th, 2011 AT 4:50 AM

7 Replies

  • Tiny
  • Jacobandnickolas
  • EXPERT
  • 68,401 POSTS

Check the socket. It may be damaged, corroded.

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Sunday, November 27th, 2011 AT 4:55 AM
  • Tiny
  • Csmo
  • MEMBER

Socket is good. If put in other area works fine

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Sunday, November 27th, 2011 AT 5:08 AM
  • Tiny
  • Jacobandnickolas
  • EXPERT
  • 68,401 POSTS

If there is power to the socket, then the ground needs to be missing. Otherwise the light would have to come on.

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Sunday, November 27th, 2011 AT 5:16 AM
  • Tiny
  • Csmo
  • MEMBER

Ok, there is two wires from the instrument harness cluster going to the socket. Pink/white & brown/white. Pink/white seems to be hot all the time. So that makes brown/white the ground? But if I ground that wont the light stay on and not switch off after motor starts? And thank you very much for the help!

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Monday, November 28th, 2011 AT 3:54 AM
  • Tiny
  • Jacobandnickolas
  • EXPERT
  • 68,401 POSTS

That would make sense. There is a chance the hot wire is on because the light should be on. It does go off when you turn the key off, correct?

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Monday, November 28th, 2011 AT 4:38 AM
  • Tiny
  • Csmo
  • MEMBER

Well the light dont come on at all except if I ground out the brown/white wire with my test light.I have not tried turning the key off when it is grounded though. The brown/white wire goes to the ECM according to my schematics, but if im understanding right its just a ground and wont cause a problem with the ECM. Another question, I have low fuel pressure, would a relay cause that or is the problem at the pump?

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Wednesday, November 30th, 2011 AT 4:16 AM
  • Tiny
  • Jacobandnickolas
  • EXPERT
  • 68,401 POSTS

You would have to check voltage to the pump.

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Wednesday, November 30th, 2011 AT 5:05 AM

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