Loader Bobcat 773. Service 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