Lesson 3/Learning Event 4
STATUS MESSAGES
A status message keeps the operator informed of what is happening. The status messages and their
meanings are as follows:
Status Message Displays
DISPLAY
MEANING
.8.8.8.8
There is power to the VTM, and the display is working properly. This
appears only for a short period after power is turned on.
----
After power turn-on, VTM is ready for testing.
During compression
unbalance test, testing is in progress.
.9.9.9.9
VTM is reading a test value beyond its range.
PASS
Unit under test has passed test, or VTM has accepted a control function
entry.
FAIL
Unit under test has failed test.
AUE
Numerical display is an average value.
LO
Engine speed below 1,600 RPM during SI power test. Indicates the engine
failed the power test.
-1-1-1-1
VTM is busy.
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