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October 2019
Service and Repair Manual
Control System Fault Codes
Part No. 1280490GT
S
®
-80 XC
™
• S
®
-85 XC
™
•
S
®
-
80 HF • S
®
-85 HF
95
ID Component ID Name
Cause
Effect
Solution
15 Foot Switch 19 Stuck ON at
power up,
or timeout
occurred.
Foot switch
input was
detected as
HIGH at
start-up, or
the
footswitch
was held for
too long and
caused the
foot switch
timer to
elapse.
Machine will not
be functional.
* Release foot switch and cycle power.
* If problem persists, with a voltmeter
verify that C24FS (WH, PCON J12-2) is
LOW when foot switch is released and 12
V when held down.
19 APU
Solenoid and
Switch
12 Solenoid
output
shorted to
V+
TCON
detected that
C27AUX
circuit is
shorted to 12
V.
Machine will not
be functional.
Check C27AUX (RD, TCON J3-3) wiring.
* With a voltmeter verify that C27AUX
(RD, TCON J3-3) is 0 V when the Auxiliary
Power toggle switch is OFF and 12 V
when switch is ON.
* Verify the terminals of the APU solenoid
have a resistance greater than 5 ohms. If
not, replace the solenoid.
15 Solenoid
output
shorted to
GND
TCON
detected that
C27AUX
circuit is
shorted to
GND.
Auxiliary Power
function will not
operate.
19 Stuck ON at
power up.
Toggle
switch input
was detected
as HIGH at
start-up.
Auxiliary Power
function will not
operate from
platform.
Verify with a voltmeter that the AUX Power
Switch (TS1) is operating properly.
* C47AUX (RD, PCON J17-10) should be
0 V with the switch OFF and 12 V with the
switch ON.
Cycle power to allow the machine to
re-test the fault.
20 Primary
Boom
Extend /
Retract
Joystick
12 Joystick
voltage too
high.
Circuit
C163PER is
above 4.5 V.
Boom Extend and
Retract functions
will not operate.
* Leave joystick in neutral position and
cycle power.
* If fault persists, with a voltmeter check
that C163PER (BL/WH, PCON J18-4) is at
2. 5V +/- 0.2 V at startup and does not go
above 4.5 V or below 0.5 V when fully
stroked in each direction.
* Replace joystick if voltage check fails.
15 Joystick
voltage too
low.
Circuit
C163PER is
below 0.5 V.
19 Joystick
held at
startup.
Circuit
C163PER
voltage was
not within the
startup
voltage
range of 2.5
V +/- 0.2 V.
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