Woodward GECO, Техническое руководство, Страница: 38 / 90

GECO

Stoichiometric Manual 03554
30 Woodward
4.) This screen shows faults associated with
the exhaust gas oxygen sensor signals or
control which depends on EGO feedback. An
EGO Hi fault indicates a signal voltage higher
than a properly operating sensor can
produce. Hth (Health) OK means that the
EGO health has not dropped below 35%.
The VL (Valve Limit) Hi and Lo faults are set
when the closed loop valve commands reach
their limits without bringing the EGO signal to
its target. The EGO3 AL (Adaptive Limit)
faults are similar, activating when the
adaptive shifting of the EGO1 and EGO2
target values reaches a limit without bringing
EGO3 to its own target value for best
emissions. More information on fault causes
can be found in the Trouble-shooting section.
5.) The fuel metering valve electrical screen
shows faults for high or low current. If the
actual valve current does not match the valve
command current, these faults will set.
Further explanation of these faults can be
found in the Troubleshooting section. This
screen also displays a high or low voltage
from the power supply. The miscellaneous faults
on this screen are for internal ECU operation and
problems with the engine speed signal.
6.) In addition to the shutdown screen which
indicates excessive catalyst temperatures,
this screen shows faults for the actual signal
from the thermocouple sensors. TCup refers
to the catalyst upstream sensor, and TCdn
refers to the downstream sensor. An open
fault indicates an open circuit, or loss of
sensor connection. The lower-than-expected
fault indicates an unbelievably low
temperature signal during operation. CJC
refers to the Cold Junction Compensation
sensor on the ECU. More information on
these faults can be found in the
Troubleshooting section.
7.) The EGO monitoring screen displays
signal and target voltages for all of the
oxygen sensors. The EGO1 and EGO2
targets will adaptively change to keep the
EGO3 signal near its “best emissions” target.
In addition, the health of the sensors can be
checked for anticipating future maintenance.
Hi Lo Misc
Valv1i:OK OK ECU: OK
Valv2i:OK OK Trig:OK
DCPowr:OK OK
Open LoExp
TCup: OK OK
TCdn: OK OK
CJC: OK OK
EGO Volt Target Hlth
1 0.XXX 0.XXXV XX%
2 0.XXX 0.XXXV XX%
3 0.XXX 0.XXXV XX%
Hi Hth Hi Lo
EGO1:OK OK VL1:OK OK
EGO2:OK OK VL2:OK OK
EGO3:OK OK AL: OK OK