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1999 Pontiac Grand Prix test port

Tiny
RONGP
  • MEMBER
  • 1999 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 120,000 MILES
Have a service engine soon light come on, and when I went to have it scanned they said that my test port was dead! Is there a fuse or something I need to check?
Tuesday, November 17th, 2009 AT 5:36 PM

2 Replies

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Yes the ALDL (assembly line diagnostic link) is a fused circuit.

Look at inside fuse box for ALDL or diagnostic fuse.
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Thursday, November 19th, 2009 AT 8:27 AM
Tiny
RONGP
  • MEMBER
  • 3 POSTS
The test port is linked with the cigarette lighter fuse.
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Saturday, November 21st, 2009 AT 2:48 PM

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