1992 Mitsubishi 3000GT check engine light

RETRIEVING CODES
Using Scan Tester
Before entering on-board diagnostics, refer to PRETEST INSPECTION . Turn ignition switch to OFF position. Locate self-diagnostic connector, next to fuse block. Connect power source terminal of scan tester to cigarette lighter socket.
Connect scan tester to self-diagnostic connector. Turn ignition on. Read and record scan tester self-diagnosis output. Perform necessary repair. See FAULT CODES .
Using Voltmeter
Before entering on-board diagnostics, refer to PRETEST INSPECTION . Turn ignition switch to OFF position. Locate self-diagnostic connector, next to fuse block. Connect voltmeter positive lead to self-diagnostic connector terminal No. 1 and negative lead to terminal No. 12 (ground). See Fig. 1 .
Turn ignition switch to ON position, and disclosure of ECU memory will begin. If 2 or more systems are non-functional, they are indicated by order of increasing code number. Indication is made by 12-volt pulses of voltmeter pointer. A constant repetition of short 12-volt pulses indicates system is normal. If system is abnormal, voltmeter will pulse between zero and 12 volts.
Signals will appear on voltmeter as long and short 12-volt pulses. Long pulses represent tens; short pulses represent ones. For example 4 long pulses and 3 short pulses indicate Code 43. After recording fault code(s), perform necessary repair to indicated circuit. See FAULT CODES