Mitsubishi Eclipse 1990 Service Manual page 537

ENGINE (TURBO)
AND ENGINE>
DIAGNOSTIC BY
(INCREASED SENSITIVITY)
When mode II is selected using the MUT-II, the check
engine/malfunction indicator lamp illuminates at the point when
the ECM detects a problem (except if the
to emissions), and at the same time the corresponding
diagnostic trouble codes are stored.
Furthermore, in the case of comprehensive component
electrical faults (opens/shorts), the time from the occurrence
of the fault to the storing of the DTC is compressed (4 seconds
1 second).
As a result of this, checking of the trouble symptoms
checking after
easier.
Once mode II has been selected, it is necessary
ignition switch to OFF or to use the MUT-II to
I once more before mode I operation can
However, all
data will be erased after returning to mode
should be recorded beforehand if necessary.
(1) Using the scan tool, changeover the diagnostic test mode
of the engine control module to DIAGNOSTIC TEST
MODE II. (INCREASED SENSITIVITY)
(2) Road test the vehicle.
(3) Read the diagnostic trouble code in the same manner
as "READ OUT OF DIAGNOSTIC TROUBLE CODE" and
repair the malfunctioning part.
(4) Turn off the ignition
NOTE
Turning OFF the ignition switch will cause the engine
control module to changeover the ECM from the diagnostic
test mode II to the diagnostic test
Revision
Troubleshooting
TEST
have been completed are both made
readiness test
related
resumed.
and frame
so this