JavierB Posted Sunday at 02:54 PM Report Share Posted Sunday at 02:54 PM Hi everyone again. Under the dash of my 81 on the left, in front of the fuse panel, is a 5 wire connector just sitting there. It says something like "PED PACK CON II " on it, but I think thats just the name of the electrical connector. It is screwed in place, not just dangling, so seems like a factory connection. What is it? Is it for the 305's engine computer? Is it a diagnostic output? Images below. Link to comment Share on other sites More sharing options...
JavierB Posted Sunday at 03:09 PM Author Report Share Posted Sunday at 03:09 PM Okay, so I guess this is a first generation diagnostic connection with only 5 pins. I was a bit confused because I've only seen 12-pin connectors for diagnostic readers, but hopefully there is a cable that lets this work in a reader. Thanks for the help folks. Link to comment Share on other sites More sharing options...
IndyJimW Posted 20 hours ago Report Share Posted 20 hours ago (edited) Test lead for 1981 Chevrolet. Diagnostic Connector (Test Lead Is At Terminal D) Used at the assembly plant to verify proper system operation--prior to shipping the vehicle--the trouble code test lead is located in a connector under the dash. KEY OFF Grounding the test lead with the ignition OFF will cause the ECM to display any stored trouble codes. KEY ON/ENGINE OFF If the test lead is grounded with the ignition ON and the engine OFF, the ECM will flash a code 12, send a 30 dwell signal to the mixture control solenoid, energize all ECM controlled solenoids and pulse the idle speed control motor in and out. ENGINE RUNNING If the test lead is grounded with the engine running, the ECM will function normally except the system will go to closed loop immediately if the engine is warm and the oxygen sensor is hot. Good luck all, Jim Wood Edited 20 hours ago by IndyJimW Link to comment Share on other sites More sharing options...
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