This vehicle is OBD1. Here is how to check for codes.
Turn ignition switch to OFF position
Locate Data Link Connector (DLC), next to fuse box or sometimes above glove box.
Connect voltmeter positive lead to DLC terminal #1 and Negative lead to terminal 12.
Turn Ignition switch to ON position.
The codes are read by 12 volt pulses of voltmeter.
A constant repetition of short pulses is normal.
Signals will appear on voltmeter a long and short pulses.
Long pulses represent tens and short pulses represent ones (2 long pulses and 3 short pulses indicates code 23)
Keep in mind, the port isn't like a typical 0bd2 set up. It it may just look like a wire connector not plugged into anything. If I recall, it is a 12 pin receiver.
Wednesday, December 9th, 2015 AT 4:29 PM