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Unread 07-07-2010, 05:01 PM   #1
weprint
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What is this module for

On my 81 CJ7 with a 258 engine, there is a module with nine wires coming out. It is located directly opposite the alternator on the passenger side wheel well. The wiring diagram I have does not indicate this part. Can someone tell me what is is and its purpose? Thanks.

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Unread 07-07-2010, 05:08 PM   #2
MoC
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Picture please.
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Unread 07-07-2010, 05:58 PM   #3
Ken4444
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Is this what you're seeing?

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Unread 07-07-2010, 08:51 PM   #4
mcmud
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That would be the first generation MCU used in the 49 state '81 & '82 build years.

It is or was used to control the fuel feed back system by taking readings from the O2 sensor and controlling the BBD stepper pins and the sol-vac actuator.
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Unread 07-07-2010, 09:57 PM   #5
weprint
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Quote:
Originally Posted by Ken4444 View Post
Is this what you're seeing?

No, it's not the starter relay but it is to the right of the relay in your picture. I believe it is the MCU as stated in another reply. Thanks for the reply.
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Unread 07-07-2010, 10:03 PM   #6
weprint
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Quote:
Originally Posted by mcmud View Post
That would be the first generation MCU used in the 49 state '81 & '82 build years.

It is or was used to control the fuel feed back system by taking readings from the O2 sensor and controlling the BBD stepper pins and the sol-vac actuator.
Thank you. Since I have a Motorcraft 2100 carb, I assume that this module isn't doing anything and could be removed along with its associated wiring. Is this correct?
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Unread 07-07-2010, 10:31 PM   #7
mcmud
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Yes sir, you can unplug it or follow the wires to snip and remove them from the harness.
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