OPERATOR'S MANUAL MAINTENANCE

Section C - Electrics
Basic System Operation
Limp Mode system
C-42 C-42
9803/9880-3
Limp Mode system
Operation
C030750GB-2
Fig 44.
In the event of a ECU1 failure, the redundancy switch
allows the function of:
1 Lever lock
2 Swing lock
3 Emergency shutdown
In the normal position, the redundancy switch feeds the
ignition voltage to the ECU1 and the redundancy i/p of the
EMS.
In the "redundancy" position, the ignition voltage is fed to
the "emergency stop" switch in the facia switch panel, via
a diode.
The emergency stop switch in the facia switch panel is fed
from the ECU1 o/p 22 (C-26). The lever lock and swing
lock functions are fed from the ECU1 o/p 21 (C-36).
The lever lock and swing lock functions are fed from the
redundancy switch via a diode.
The EMS will permanently display a "LIMP HOME"
message and all bar graph bars will illuminate together and
flash on/off at half second intervals. The buzzer will sound,
this can be cancelled by pressing the ACK button.
The engine will run at the default engine speed (approx.
1600 rpm).
1
2
+V ign
Key
Switch
16 Ignition
Sys B-5
O/p 22 (C-26)
O/p 21 (C-36)
I/p 32 (A-33)
15 Redundancy
2A
Lever Lock Sol.Valve
Emer. Stop
Lever Lock
Switch
Limp mode
Switch
EMS
Limp Mode
ECU1
Swing Lock Sol. Valve
FSP
O/p 34 (C-38)