P1509 iacv malfunction

Tiny
SHUSS2012
  • MEMBER
  • 1996 HONDA CIVIC
  • 275,336 MILES
I have tried changing the engine harness 3 times with new harness' I have replaced iacv sensor with 7 new sensors. I have tried 6 different ecu (pcm) (computers) tried changing pgmfi main relay. Tried changing 02 sensors. The voltage on a 3 wire iacv is supposed to be 4.9 on orange wire. Battery voltage on yellow with black stripe wire. And 10.33 volts on the black with blue stripe wire at normal operating temperature. I have traced all the wires and have continuity on all wires. But the problem seems to be that all 3 wires are getting straight battery voltage.
Monday, May 7th, 2012 AT 7:16 PM

6 Replies

Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
I would definately stop the changing as it's not helping?
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Monday, May 7th, 2012 AT 7:20 PM
Tiny
SHUSS2012
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I just want it to be clear that everything has been tried.
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Monday, May 7th, 2012 AT 7:22 PM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Did you acquire the vehicle in this condition?
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+1
Monday, May 7th, 2012 AT 7:29 PM
Tiny
SHUSS2012
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Yes.
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Monday, May 7th, 2012 AT 7:33 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Wow, I think you created more issues than solving anything.

If it was me, I would put everything back to original and start the checks with all original wiring. There is an issue with either the wiring or the pcm. You cannot swap out pcms like you did as they will never work due to flashing.

Roy
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Tuesday, May 8th, 2012 AT 12:36 AM
Tiny
MD_AUTO
  • MEMBER
  • 1 POST
I have tried changing the engine harness 3 times with new harness' I have replaced iacv sensor with 7 new sensors. I have tried 6 different ecu (pcm) (computers) tried changing pgmfi main relay. Tried changing 02 sensors. The voltage on a 3 wire iacv is supposed to be 4.9 on orange wire. Battery voltage on yellow with black stripe wire. And 10.33 volts on the black with blue stripe wire at normal operating temperature. I have traced all the wires and have continuity on all wires. But the problem seems to be that all 3 wires are getting straight battery voltage.

((((I also face on the same problem, what's the solution?)))))
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Tuesday, July 22nd, 2014 AT 5:58 AM

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