Obd1 testing unable to pull codes?

1994 FORD E-SERIES VAN
55,000 MILES • 7.5L • V8 • 2WD • AUTOMATIC
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LOSS12NICK
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On my RV I have tried pulling codes. Can’t seem to get any with every method I’ve tried. Wire jumping, test light, and even the tool won’t work.
Check engine light stays on constantly, and I have tried disconnecting the battery and PCM to reset. The light was still on when I hooked it back up. Any suggestions? Could my single pin test wire be short/ground? Please help.
Sep 14, 2022 at 3:48 PM
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JACOBANDNICKOLAS
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Hi,

That's an interesting one. Do me a favor, read through this link and let me know if this is what you are doing:

https://www.2carpros.com/articles/ford-lincoln-mercury-obd1-1995-and-earlier-diagnostic-trouble-code-definition-and-retrieval

Additionally, I attached the wiring schematic for the computer data lines and data link connectors. (DLC) so you have a reference.

Take care and let me know what you find.

Joe

See pic below.
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Sep 14, 2022 at 7:34 PM