1991 Buick Skylark ECM/pcm

HARRY/ALICE

MEMBER
1991 BUICK SKYLARK
4 CYL
FWD
AUTOMATIC
35,000 MILES

How do I check the three inputs to the unit for the correct resistance.

Tuesday, February 9th, 2010 AT 12:04 AM

7 Replies

BUDDYCRAIGG

MECHANIC
2,262 POSTS

Resistance to what?
One of the sensors, or a circuit of wire.

What are you wanting to test?

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Tuesday, February 9th, 2010 AT 12:28 AM

HARRY/ALICE

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4 POSTS

Lack of resistance in 1 of 3 cables going to the ecm/pcm caused an overload. What pins do I check
in the 3 cables to correct the problem before i
replace the electronics?

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Tuesday, February 9th, 2010 AT 11:29 PM

BUDDYCRAIGG

MECHANIC
2,262 POSTS

Are you suggesting that you have 3 bundles of wires going to your ECM. And one of those wires, in one of those bundles has low resistance. And thus causing your ECM to blow up?

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Wednesday, February 10th, 2010 AT 12:03 AM

HARRY/ALICE

MEMBER
4 POSTS

Yes, the resistance to the ecm in one of the bundles
is too low or nonexistent, thus frying the system. It
should be a pair of pins in each bundle that could
give the answer so I can correct it before I order a new ecm/pcm

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Thursday, February 11th, 2010 AT 12:20 AM

BUDDYCRAIGG

MECHANIC
2,262 POSTS

If you know what the resistance to each wire should be. Then you should be able to check them to find the bad one.

But I'm curious, how did you come up with this low Resistance idea.