Mitsubishi Stealth 1994 Import Service Manual page 1249

24-57
FULL AUTO AIR CONDITIONING
ON-BOARD DIAGNOSTIC CHECKING
When using the scan tool
Connect the scan tool to the data link connector to read out the
diagnostic trouble codes.
Caution
Turn off the ignition switch beforehand whenever the scan
tool is connected or disconnected.
When using the voltmeter
Connect a voltmeter to the diagnostic output terminal and the
ground terminal of the data link connector using the special
tool. Read out the diagnostic trouble code by observing the
voltmeter pointer deflection.