Additional Tests
SYSTEM/ACTUATOR TESTS
52
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Engine Speed Control
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Throttle Position
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Throttle Sweep
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Reset Idle Learn
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EGR Solenoid
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Fuel Injector Balance
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Cylinder Power Balance
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Misfire Graphic
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Engine Oil Life Reset
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Crankshaft Position Variation Learn
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HO2S Learn Sensor
If an error occurs while performing any function, an “advisory”
message displays. Choose
Exit
to return to the ECM Special
Functions menu.
Engine Speed Control
The Engine Speed Control function lets you increase or decrease engine
speed from a base commanded RPM in 25 RPM increments.
1.
Select
Engine Speed Control
in the ECM Special Functions menu,
then press
ENTER
.
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An “instructional” screen displays. Prepare the vehicle for test as
directed:
- Set the parking brake.
- Block all drive wheels.
- Start and idle the engine.
2.
Choose
Next
to continue.
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Engine speed is commanded to 550
RPM and the RPM Control test
screen displays.
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The screen shows the
Commanded
RPM
,
actual
Engine Speed
, and the
Desired Idle Speed
.
3.
Choose
Decrease 25 RPM
or
Increase
25 RPM
, as desired, to decrease or
increase engine speed, and observe
results on the display.
4.
To exit the test, press
ENTER
to reduce the commanded engine
speed to 0 RPM, then press
ENTER
again to return to the ECM
Special Functions menu.
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