MerCruiser PCM-555 EFI
Page 40
the scanner will begin to display several warning messages. Review these
messages and be certain their instructions are followed.
3) When the safety messages have been displayed, you may select the ignition
coil you wish to test by using the
▲
and
▼
keys. To begin firing the selected
coil press the TEST key. This action will being actuating the ignition coil at a
speed equivalent to 1600 rpm for a period of approximately 10 seconds.
• To abort the Ignition Coil test at any time, press and hold the
scanner’s NO key.
4) After the test is complete you may return to step #3 to test another ignition
coil or press the NO key to return to the scanner’s Output Test menu.
Direct Injector Output Test (engines with direct injectors only)
The Direct Injector output test allows individual injectors to be actuated to verify
their operation. The injector under test will be fired at a rate equivalent to 1600
rpm. This test helps a technician verify that a particular direct injector is receiv-
ing a command signal from the PCM.
• IMPORTANT: Before performing this test the engine’s electric fuel
pump should be disabled. Disabling of the fuel pump may be accom-
plished by removing the fuel pump fuse or disconnecting the pump’s
electrical connector.
• This test should be performed with Key-On and Engine Off.
1) Review the warnings stated above and be sure the engine is not running when
attempting to perform this test.
2) After selecting the “Direct Injectors“ function from the PCM Output Test
menu the scanner will begin to display several safety messages. Review these
messages and be certain their instructions are followed.
3) When the safety messages have been displayed, you may select the injector
you wish to test by using the
▲
and
▼
keys. To begin firing the selected in-
jector press the TEST key. This action will being actuating the direct injector
at a speed equivalent to 1600 rpm for a period of approximately 10 seconds.
• To abort the Direct Injector test at any time, press and hold the
scanner’s NO key.
4) After the test is complete you may return to step #3 to test another injector or
press the NO key to return to the scanner’s Output Test menu.
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