Question about 1991 Ford F250
How do I get the trouble codes without a scanner?
I heard there is a way to" jump a circuit" to make the check engine light
flash the codes. How do I do that?
Yes you can use a piece of wire on the Diagnostic Link Connector and the Self Test Input connector.
The DLC may or maynot be labeled, but it is the top right position you connect to the STI to get the codes. Can be read with the Check Engine Light. I would suggest getting a service manual from a parts store to help with this diagnostic, it has the codes list.
Posted on Feb 24, 2009
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Posted on Jan 02, 2017
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