Output Cycling Tests
This series of tests cause ECM to cycle various output signals on and off. During this test, operation of engine control solenoids and lamps may be checked by using command signals from ECM.
As a lamp and system check, "CHECK ENGINE" lamp should glow when ignition is turned on and go out after 1-4 seconds after engine has started. If not, ECM has detected fault in system.
NOTE:
The 4 tests which comprise the diagnostic system should be performed in the sequence given to diagnose any failure in the shortest period of time.