Test discontinued due to no information being detected by VTM. This will occur after
several minutes of no-signal operation.
No first peak information was detected by the VTM.
VTM cannot calculate result. Current is over current probes range, and VTM did not
sample correct portion of data.
External voltage was detected in the circuit under test while measuring resistance.
VTMs constant voltage source is not working.
Test is not valid for VID entered.
Error in entry of compression unbalance constants.
Test just entered cannot be used with control function 06.
VID entered conflicts with speed transducer attached.
Vehicles cranking speed is varying too much for a compression unbalance measurement.
Error in entry of power test constants.
b. Status messages. Status messages keep the operator informed of what is happening.
There is power to the VTM and the display is working properly. This appears only for a
short period after power is turned on.
VTM is reading a test value beyond its range.
Unit under test has passed test, or VTM has accepted a control function entry.
Unit under test has failed test.
Accepted control function input.
Numerical display is an average value.
Engine speed below 1600 rpm during SI power test indicates the engine failed the power
VTM is busy.
c. Numerical readouts. Unit of measurement (psi, rpm, Volts, etc.) are not displayed. Numerical readouts
indicates the measured valve in units of the measurement being made. For example, if you are measuring
0-45 volts dc, 12.7 is volts dc. If you are measuring 0-25 psig pressure 12.7 is psig. The units for each test
are listed on the flip cards. Also the readout when undulating vehicle identification data (VID).