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XT 582 Maintenance Manual
Issue 1.0
September 21st 2005
Page 92
77.30.00 Analysers
Cylinder Head
The SkyDAT instrument will show "open" when there is an open circuit in the CHT circuit.
To determine if the problem is the wiring or the sender simply short-circuit the sender connection to
ground at the CHT sender and a message short-circuit should show on the screen for that CHT". This
test determines that the wires between the CHT sensor and the SkyDAT are intact.
If there is no “Short Circuit” Signal
If the SkyDAT does not show a short circuit signal, then the wiring between the CHT and the SkyDAT
needs to be checked. The best place to start the inspection would be the physical connections, before
tracing the wire through. Simply checking the resistance of the wires between each section, as well as
to earth (to check for short circuit) will determine the circuit’s integrity. Full electrical system analysis
instruction is beyond the scope of this manual.
Cylinder Head Temperature (CHT)
A "good" CHT sender measures approximately 800 Ohms (resistance) at room temperature. (when
measured between the brass terminal and the block of the engine.) (Remove the red wire from the
sender to perform this test) See attached photograph.
Figure 60 Earthing of CHT Sender, to check the wire to the SkyDAT.