TCM FB-8 Series, Service Manual

Page: 210 / 259

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3. TROUBLESHOOTING GUIDE
3.4 LCD PANEL SYSTEM ERRORS
Error
Code
Description Problem Cause Corrective Action
Icon
displayed
071 CM relay
malfunction
The travel, load-
handling and
EPS systems are
inoperative.
This error code is displayed when no current is
being drawn by the CM contactor or the “a”-
contact.
The CM contactor, diodes, or their wiring may
be defective.
Check BW211 and LY212 between the
LCD panel and the CM contactor. Check the
RL100 wire that goes to the CM contactor.
Also check any diodes connected in parallel.
If no problem is found, replace the CM
contactor with a new one.
Wrench
072 PO relay short
circuit
Undefined
This error code is displayed if there is no
current being drawn by the PO relay coil.
The PO relay or its wiring may be defective.
Check YG 208 between the LCD panel and
the PO relay. Check the RL100 wire that
leads to PO relay. If no problem is found,
replace the PO relay with a new one.
Wrench
073 CM relay short
circuit
The travel, load-
handling and
EPS systems are
inoperative.
This error code is displayed if the CM
contactor does not work when the charge
STOP button on the battery charger control
panel is pressed.
The CM contactor, diodes, or their wiring may
be defective.
Check BW211 and LY212 between the LCD
panel and the CM contactor, and the RL100
wire that leads to the CM contactor. Also
check any diodes connected in parallel. If no
problem is found, replace the CM contactor
with a new one
Wrench
074 AD conversion
error
The travel, load-
handling and
EPS systems are
inoperative.
This error code is displayed if a time-out has
occurred while receiving analog input data
(current draw or temperature readings).
Any of the indicators or wiring may be
defective.
Replace the LCD panel with a new one.
Wrench
075 RTC error
The travel, load-
handling and
EPS systems are
inoperative.
This error code is displayed if a time-out has
occurred while receiving data from the RTC
(real time clock).
The connections on the LCD panel board or
the RTC may be defective.
Wrench
076 EEPROM access
error
The travel, load-
handling and
EPS systems are
inoperative.
A time-out has occurred while reading memory
or writing to the LCD panel memory.
The connections on the LCD panel board or
the EEPROM may be defective.
Remove and reinstall the battery connectors.
If the problem is not solved, replace the
LCD panel with a new one.
Wrench
077 Program sum
error
The travel, load-
handling and
EPS systems are
inoperative.
These error codes refer to errors that occur
while loading the program or when an
incorrect program version was loaded.
Replace the LCD panel with a new one.
Wrench
078 Version loading
error Wrench
081 AC ON
The travel, load-
handling and
EPS systems are
inoperative.
This error code is displayed if the key switch
is turned ON while AC power supply is
connected.
To reset, turn the key switch OFF. Wrench
082 Communication
error (controller)
The travel and
load-handling
systems can
work.
This error code is displayed if no signal is
received from the controller.
The controller or the controller communication
lines may be defective.
Check to see if the controller operates
properly when the key switch is tuned ON
(see if the orange pilot lamp on the main
CPU board is lit). Check the communication
lines (GW81, GR82) between the LCD panel
and the controller. If no problem is found,
replace the LCD panel with a new one.
Wrench
083 Communication
error (PC)
The travel, load-
handling and
EPS systems are
inoperative.
This error code is displayed if no signal is
received from PC.
The communication line with PC may be
defective.
Follow the instructions given by the fault
diagnosis program installed on a PC.
Check the communication lines between the
LCD panel and PC. If no problem is found,
replace the LCD panel with a new one.
Wrench
084
Another mode
was requested
while charging
The travel, load-
handling and
EPS systems are
inoperative.
This error code is displayed if the key switch
is turned ON while charging.
To reset, turn the key switch OFF. Wrench
085 Low battery
voltage
The travel, load-
handling and
EPS systems are
inoperative.
This indicates that the battery voltage detected
by the LCD panel has dropped below 26 V.
This error will be cleared when the battery
voltage returns to 24 V. When cleared, the
key switch is forced OFF.
Wrench
087 Abnormal
charging
The travel, load-
handling and
EPS systems are
inoperative.
This error code is displayed if the charging
process has not finished when the fail-safe
timer times out, or if an AC power failure lasts
for more than 120 hours while charging. The
LED on the battery charger control panel will
keep blinking.
Connect the battery while pressing and
holding the SUPER EQUALIZE switch on
the battery charger control panel.
Wrench
088
AC power
failure during
charging
The travel, load-
handling and
EPS systems are
inoperative.
This error code is displayed if the AC power
goes OFF while charging.
The truck is not operative because the battery
is being charged.
This error will be cleared when the AC
power is restored and then charging will
resume.
Wrench