Additional Tests
SYSTEM/ACTUATOR TESTS
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3.
Select
Increase
or
Decrease
, as
desired, then press
ENTER
.
n
The screen refreshes to show the
Result
.
4.
Repeat step 3 as desired.
5.
Choose
Exit
to return to the Active Test
menu.
Fuel Pump
The Fuel Pump function lets you turn the fuel pump on or off.
1.
Select
Fuel Pump
in the Active Test menu, then press
ENTER
.
n
An “informational’ screen displays.
2.
Press
ENTER
to continue.
n
The Fuel Pump screen displays.
3.
Select
On
or
Off
, as desired, then press
ENTER
.
n
The screen refreshes to show the
Result
.
4.
Repeat step 3 as desired.
5.
Choose
Exit
to return to the Active Test
menu.
Injector Disable
The Injector Disable functions let you disable a selected fuel injector.
1.
Select
Injector 1 Disable
,
Injector 2 Disable
,
Injector 3 Disable
or
Injector 1 Disable
in the Active Test menu, as desired, then press
ENTER
.
n
An “informational’ screen displays.
2.
Press
ENTER
to continue.
n
The
Injector
Disable
screen
displays.
3.
Select
Disabled
, then press
ENTER
.
n
The screen refreshes to show the
Result
.
4.
Choose
Exit
to return to the Active Test menu.
GM System & Actuator Tests
Depending on the vehicle under test, the ECM Special Functions menu
provides access to one or more of the following tests:
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