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Service and Repair Manual
October 2019
Control System Fault Codes
96
S
®
-80 XC
™
• S
®
-85 XC
™
•
S
®
-
80 HF • S
®
-85 HF
Part No. 1280490GT
ID Component ID Name
Cause
Effect
Solution
21
Primary
Boom Up /
Down
Joystick
12 Joystick
voltage too
high.
Circuit
C164PUD is
above 4.5 V.
Boom Up and
Down functions
will not operate.
* Leave joystick in neutral position and
cycle power.
* If fault persists, with a voltmeter check
that C164PUD (RD/WH, PCON J18-3) 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
C164PUD is
below 0.5 V.
19 Joystick
held at
startup.
Circuit
C164PUD
voltage was
not within the
startup
voltage
range of 2.5
V +/- 0.2 V.
22 Primary
Boom Up
Valve
12 Circuit
shorted to
V+
TCON
detected that
C1PBU
circuit is
shorted to 12
V.
Boom Up function
will not operate.
Boom Down will
also not operate if
short is to 12 V.
* With a voltmeter, measure Y22. Proper
resistance should be between 5 - 60
ohms. Replace Y22 if resistance is
outside of those values.
* Verify wiring for C1PBU (RD, TCON
J4-10) and check for open or short circuits.
15 Circuit
shorted to
GND
TCON
detected that
C1PBU
circuit is
shorted to
GND.
23 Primary
Boom Down
Valve
12 Circuit
shorted to
V+
TCON
detected that
C2PBD
circuit is
shorted to 12
V.
Boom Up and
Down functions
will not operate.
* With a voltmeter, measure Y21. Proper
resistance should be between 5 - 60
ohms. Replace Y21 if resistance is
outside of those values.
* Verify wiring for C2PBD (RD/BK, TCON
J4-9) and check for open or short circuits.
* Verify resistance between Recovery
Module pins J37-2 and J37-11 is zero
ohms.
15 Circuit
shorted to
GND
TCON
detected that
C2PBD
circuit is
shorted to
GND.
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