Woodward TecJet 110, Installation And Operation Manual, Page: 36 / 52

TecJet 110 Fuel Metering System Manual 26185
30 Woodward
WARNINGS
Warning Description Possible Cause Possible Actions
Analog Flow
Demand High The analog flow
demand exceeds the
analog flow demand
maximum fail limit. Analog input wiring
problem.
Analog input current is out
of range.
Check the analog input
wiring for shorts, open
connections and
intermitted contacts.
Ensure that the analog
input signal is within the
configured range. The
service tool displays the
analog input current and
the range limits.
Analog Flow
Demand Low The analog flow
demand is below the
analog flow demand
minimum fail limit. Analog input wiring
problem.
Analog input current is out
of range.
Check the analog input
wiring for shorts, open
connections and
intermitted contacts.
Ensure that the analog
input signal is within the
configured range. The
service tool displays the
analog input current and
the range limits.
CAN Flow
Demand Failed The CAN flow
demand is not being
received. The time
between messages
must be less than the
CAN flow demand
timeout value. Incorrect TecJet Number
ECM is not sending Qgn
messages, or is not
sending to the correct
TecJet number
CAN termination problem
CAN wiring problem
CAN noise problem.
CANbus incompatibility
with ECM, e.g., baud rate.
CAN traffic overload. Check the CAN ID inputs
to the valve.
Verify that the ECM is
powered up and sending
valid Qgn messages, and
that the correct TecJet ID
numbers are selected.
Check if the CANbus has
the right termination
resistor connected at both
ends of the bus.
Check the CAN wiring for
shorts, open connections,
interchanged connections,
and intermittent contacts.
Verify that the CAN wiring
is installed according to the
installation instruction
Verify ECM CANbus
compatibility.
Verify that there is not
excessive CAN traffic that
has higher priority than the
TecJet 110 flow demand
message.