1997 - 2000 DFI ECM
Page 30
2) Aer selecting the “Fuel Injectors“ function from the Output Tests menu the
scanner will display several warning messages. Review these messages and be
certain their instructions are followed.
3) When the warning messages have been displayed you may select the fuel
injector you wish to test by using the ▲ and ▼ keys. To begin ring the
selected injector press the TEST key. is will actuate the fuel injector for a
few 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 Output Tests menu.
Ignition Coil Output Test
e Ignition Coil output test allows individual coils and their associated spark
outputs to be red to verify their operation. is test requires that a spark gap
tester be used to verify proper ignition coil operation. is test helps a technician
verify that a particular ignition coil is receiving a command signal from the ECM
and that the coil’s high voltage output is sucient to generate a spark discharge.
• WARNING: Use of spark gap tester is required for this test. Do not
perform this test with the ignition wires attached to the engine’s spark
plugs while they are installed in the cylinders.
• Engine backre and external ame can occur. As a safety precaution,
purge fuel vapors from the engine before proceeding.
• An approved spark gap tester must be attached to the spark output
under test. See the spark gap tester’s instructions for proper installa-
tion, adjustment and use.
• 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 “Ignition Coils“ function from the Output Tests menu the
scanner will begin to display several warning messages. Review these messag-
es and be certain their instructions are followed.
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