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1995 Chevy Suburban check engine light stays on

Tiny
WHEEL28
  • MEMBER
  • 1995 CHEVROLET SUBURBAN
  • V8
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
The service engine soon light on my 95 Suburban stays on all the time. I have tried to pull codes from it by shorting the A & B terminals in the ALDL connector, but it will not flash the codes, the light just stays on. The idle is low and rough, there is a strong fuel smell under the hood, and the transmission will not up or downshift automatically. I can shift up or down with the lever. Is this maybe a bad ECM?
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Sunday, August 16th, 2009 AT 3:59 PM

2 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hi
Would have to a agree with your diagnosis. Only thing I would check would be PCM ground located on left top front engine. look at pics is your ALDL the 12 pin or 16 pin? if 16 then can test with OBDII if 12 make sure ther ois ground on term. A
Let me know
Thanks for donate


https://www.2carpros.com/forum/automotive_pictures/198357_Graphic_73.jpg


https://www.2carpros.com/forum/automotive_pictures/198357_Grafic_3_16.jpg

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Sunday, August 16th, 2009 AT 4:19 PM
Tiny
WHEEL28
  • MEMBER
  • 2 POSTS
The PCM ground is good, the ground terminal in the ALDL is also good. It is a 12 pin socket.

Apreciate the help!
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Sunday, August 16th, 2009 AT 4:34 PM

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