Question about 1994 Geo Metro

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Trouble Code description

I have a 1994 Geo Metro 1.0L , OBD-1, & MT. I am getting a trouble code 46, but can't seem to locate what trouble code 46 is. It is not listed in my manual. Can anyone help me here?
Thanks, Jlawx2

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  • Anonymous Jan 14, 2009

    how did you get the code from that 1994? What wires did you have to jump out?

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Code 46 is indeed the trouble code for the Idle Speed Controller which is that big black box thingy on your throttle body. A lot of Chilton-type manual books omit that code because the ISC isn't found on pre 94 Metros. The ISC is a computer controlled auto-adjuster for the engine idle.

An important note: code 46 is often caused by misadjusted distributor timing. As you probably know, timing affects the idle, and if improper timing moves the idle beyond the ISC's adjustment range, the check engine light will come on and diagnostics will return code 46.

Posted on Jul 11, 2009

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Code 46 Idle Speed Control (ISC) motor circuit.
Check the ISC motor connector and cicuit.

Posted on Jul 20, 2008

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