Loader Bobcat 773. Manual — part 104
MONITOR SERVICE CODES
The following list references the defect codes that are
transmitted to the instrument panel display which can
occur. Some service procedures for correcting the
problems can be found in this manual and other
procedures must be performed ONLY BY QUALIFIED
BOBCAT SERVICE PERSONNEL.
Service Codes
Instructions are necessary before operating or
servicing machine. Read and understand the
Operation & Maintenance Manual, Handbook
and signs (decals) on machine. Follow
warnings and instructions in the manuals when
making repairs, adjustments or servicing.
Check for correct function after adjustments,
repairs or service. Untrained operators and
failure to follow instructions can cause injury
or death.
W–2003–0199
SUBJECT
DISPLAY READS
Engine Coolant Level
ECL 1
SHUTDOWN, No Coolant
Engine Coolant Temp.
EC–1.1
SHUTDOWN, Engine Temperature
EC–2.1
WARNING, Engine Temperature
EC 3
Wiring Not Connected
EC 4
Wiring Shorted
EC 5
High Sensor Voltage
EC 7
Sensor Out Of Range
Engine Oil Pressure
EP 1
SHUTDOWN, Pressure
EP 2
WARNING, Pressure
EP 3
Wiring Not Connected
EP 4
Wiring Shorted
EP 5
High Sensor Voltage
EP 7
Sensor Out Of Range
Engine Speed
ES 1
SHUTDOWN, Engine Speed Too High
ES–2.1
WARNING, Engine Speed Slightly High
ES–6
Sensor No Signal
ES–7
Sensor Out Of Range
Air Filter
AF 2
WARNING, Restriction Too High
AF 6
Sensor No Signal
Battery
b–2.1
WARNING, Bad Battery
b–2.2
WARNING, Battery Voltage
Fuel Level
FUEL2
WARNING, Low Level
FUEL3
Wiring Not Connected
FUEL4
Wiring Shorted
FUEL5
High Sensor Voltage
FUEL7
Sensor Out Of Range
CONDITION
Revised June 01
773 BICS Loader
–8–23–
Service Manual
MONITOR SERVICE CODES (Cont’d)
Service Codes (Cont’d)
SUBJECT
DISPLAY READS
Hydrostatic Charge
HF1–2
WARNING, High Restriction (1st Filter)
Filter Conditions
HF1–6
Sensor No Signal
HF2–2
WARNING, High Restriction (2nd Filter)
HF2–6
Sensor No Signal
Hydrostatic Fluid
HP 1
SHUTDOWN, Pressure
HP 2
WARNING, Pressure
HP 3
Wiring Not Connected
HP 4
Wiring Shorted
HP 5
High Sensor Voltage
HP 7
Sensor Out Of Range
Hydrostatic Fluid
HC 1
SHUTDOWN, Temperature
Temperature
HC 2
WARNING, Temperature
HC 3
Wiring Not Connected
HC 4
Wiring Shorted
HC 5
High Sensor Voltage
HC 7
Sensor Out Of Range
CONDITION
Revised Jan. 99
–8–24–
773 BICS Loader
Service Manual
12 volt supply and
BOSS failure.
Sensor No Signal or
No RPM’s.
Lack of 5.0 volts
regulated power.
Low voltage (5.0)
triggered reset.
The display is not fault
tolerant. Also can be
an indication of poor
internal connections.
Bad display or BOSS
is not communicating.
Temperature related
shutdown codes
when no heating
occurs.
Intermittent code of
ES6 while engine
running.
Display is dead – No
Icons, Bar Graphs,
Hourmeter.
During an active
WARNING display,
reset occurs and the
hourmeter becomes
all zero’s.
Garbled message,
missing segments,
etc.
After glow sequence
or after a WARNING
goes away, the Icon
remains ON.
No Bar Graphs, no
Hours.
LCD DISPLAY
CONNECTOR
A B C D E
Ground
Positive Com. 3.5 to 4 Volts
5.0 Volts Regulated Power
Orange
NOTE: The display has caused the
problem by locking the
communication lines and
stopping communications from
the BOSS.
1.
Check stored defects with the BOSS tool.
*2.
If defect list has EC1, HC1, EC2.1, HC2. EP3,
EP7, HP7, B2.2, low fuel, Fuel 7 and last
occurrence hr. readings are within a hundredth,
the BOSS is defective and must be replaced.
3.
Using a voltmeter, check the alternator output.
1.
ES6 will occur if the loader is stalled or shutdown
during run cycle. The code is generated due to the
lack of RPM and the existence of residual
pressure in the system.
1.
Check pin A for 5.0 volts. If 5.0 volts is present
replace the display.
2.
If no power exists at pin A, install BOSS backup
to confirm the BOSS system.
3.
If the problem still exists, check the harness for
continuity.
1.
Turn the ignition switch OFF. Re–starting will
return hourmeter reading.
2.
If re–starting will not return hourmeter reading,
check pins B & C as stated in Step 5 below.
1.
Turn the ignition switch OFF and re–start. A
fault is an invalid message that the display tries
to display. Generally a fault occurs if
communications of two messages are combined
on the display.
1.
Turn the key OFF and re–start.
1.
Plug in the BOSS tool and start the engine.
2.
If data is being received by the BOSS tool, the
BOSS unit is not the cause of the problem.
3.
If no data is received at the BOSS tool.
disconnect the LCD display.
*4.
If messages are now received at the tool, the
display is the problem. If problem still exists go to
Step 5.
5.
Check pins B & C for signal.
6.
If there is no signal, install BOSS backup unit.
7.
If the problem still exists, check the harness for
continuity.
TROUBLESHOOTING THE BOSS
®
& LCD DISPLAY
Chart
NOTE: You may have some or all of the
codes listed. You will have high
temps, high press, low voltage
and low fuel.
BOSS
LCD Display
12 Volt – Back Light
Negative Com. .5 to 1.5 Volts
Black
Orange
Purple/Red
Purple/White
Power Display Operation
TO CORRECT SYMPTOM
INDICATES
SYMPTOM
SUBJECT
*
*
Revised Jan. 99
773 BICS Loader
–8–25–
Service Manual
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