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1995 Chevy Suburban check engine light stays on

1995 CHEVROLET SUBURBAN
150,000 MILES • V8 • 2WD • AUTOMATIC
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WHEEL28
  • MEMBER
  • 2 POSTS
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?
Aug 16, 2009 at 8:59 AM
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DOCFIXIT
  • ✓Experienced 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://images.2carpros.com/forum/automotive_pictures/198357_Graphic_73.jpg


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

Aug 16, 2009 at 9:19 AM
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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!
Aug 16, 2009 at 9:34 AM
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