Mitsubishi 3000GT Service Manual page 778

ECS - Service Adjustment Procedures
Ground term;)
TSB Revision
When using the voltmeter <Up to 1993 models>
(1) Set the ignition switch to OFF.
(2) Connect the positive (+) terminal of the voltmeter to the
No. 3 terminal of the data link connector beside the junction d
block and connect the negative (-) terminal of the voltme-
ter to the No. 12 terminal.
(3) Set the ignition switch to ON.
(4) Read the diagnostic trouble code on the basis of the
deflection of the pointer of the voltmeter.
(5) Based on the diagnostic trouble code, repair the
associated defective portion.
(6) Set the ignition switch to OFF.
(7) Disconnect the battery cables from the battery terminals
and reconnect them more than 10 seconds thereafter.
(8) Set the ignition switch to ON, perform on-board diagnostic
check again, and check that the diagnostic trouble code
is good.
Connect a voltmeter to the diagnostic output terminal and
ground terminal of the data link connector using the special
tool. Observe the pointer deflection to read out the diagnostic
trouble code.