MerCruiser PCM-555 EFI
Page 38
Figure 19 PCM Output Tests Menu
PCM OUTPUT TESTS
Fuel Injectors
Fuel Pump Relay
Ignition Coils
Direct Injectors
Warning Horn
Fuel Injector Output Test
e Fuel Injector output test allows individual fuel injectors to be actuated to ver-
ify their operation. e fuel injector under test will be red at a rate equivalent
to 1600 rpm. is test helps a technician verify that a particular fuel injector is
receiving a command signal from the PCM. is test will not reveal if an injector
is clogged, internally leaking or mechanically worn.
• 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) Aer selecting the “Fuel Injectors“ function from the PCM Output Test menu
the scanner will begin to display several safety messages. Review these mes-
sages and be certain their instructions are followed.
3) When the safety messages have been displayed, you may select the fuel injec-
tor you wish to test by using the ▲ and ▼ keys. To begin ring the selected
injector press the TEST key. e fuel injector will begin actuating at a speed
equivalent to 1600 rpm for a period of approximately 10 seconds.
• To abort the Fuel Injector test at any time, press and hold the
scanner’s NO key.
4) Aer 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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