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This is not an obdII equipped vehicle, nor does it have a DPFE sensor. if it's an 86-87 2.9 it will have an EGR pressure transducer. The connection in question is the line from the charcoal canister.DifferentialPressureFeedbackExhaust the dpfe sensor its a emission component to monitor egr flow. the main problem with these are moisture contamination, and exhaust heat will be the death of the sensor, it corrodes the sensor inside and destroys the seals around the pressure sensing ceramic disc. i think it usually springs a EGR valve excessive flow code PO402. voltage should be around .9v +_ a few...if not its out of range.