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1998 Buick Lesabre Check Engine Light

Tiny
RMORA0527
  • MEMBER
  • 1998 BUICK LESABRE
  • 74,000 MILES
Check engine light does not turn on. My friend tried to "scan" with a Snap-on SOLUS Pro and could not retrieve any codes (He's a 25 Year ASE Master Mechanic from GM) he told me that something has been disconnected? Can you get me heading in the right direction to trace this problem. Thanks
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Monday, March 16th, 2015 AT 12:45 PM

1 Reply

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Did you check for voltage at pin 16 data link connector? Pins 4 and 5 are grounds. One way to see if computer is awake, key on, check for ref voltage at any sensor that uses a ref voltage, if nothing, Have to check voltage and ground circuits for computer before saying anything about the computer itself.

If you want to check the circuit for the check engine lamp, we can do that, also. I haven't looked at wiring for that, usually the pcm grounds that circuit in order to turn on the lamp.

Anybody with other ideas, jump in.
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Monday, March 16th, 2015 AT 1:36 PM

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