1997 - 2000 DFI ECM
Page 29
Figure 17 DFI Functions Menu
DFI FUNCTIONS
Output Tests
Induced Misfire Test
Reset Break-In
Output Tests
e Output Test menu option provides a technician with the ability to exercise
various DFI actuators and controls in order to verify correct operation. Selecting
the “Output Tests” menu choice displays a sub-menu of items available as shown
in Figure 18.
Figure 18 DFI Output Tests Menu
DFI OUTPUT TESTS
Fuel Injectors
Ignition Coils
Direct Injectors
Oil Pump
Main Power Relay
Fuel Injector Output Test
e Fuel Injector output test allows individual fuel injectors to be actuated to
verify their operation. is test helps a technician verify that a particular fuel
injector is receiving a command signal from the ECM. 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.
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