Troubleshooting Guide
DCS Error Codes
6
6-19
60HD-Rdoc072619
Troubleshooting Guide
AC Drive
Power Sup-
ply
E48
Power Sup-
ply voltage
low
1) For/Rev AC Drive
24v power supply
overloaded.
2) Inspect control wir-
ing for damage.
3) Consult the
manual.
The E48 error code indicates that the 24V power supply on the for-
ward/reverse AC inverter drive has dropped below 18V. This can
be caused by damaged (shorted) wiring from the 24V output of the
drive or a defective circuit within the ECM.
LCD Back-
light
E53
Current too
High
1) Inspect wiring for
damage.
2) Consult the
manual.
The E53 error code indicates the HMI has detected that the LCD
backlight is drawing too much current. This can be caused by
damaged (shorted) wires from the HMI to the LCD backlight, a
defective LCD backlight, or a faulty output on the HMI.
Possible Solution(s):
Inspect the wires for the LCD backlight for damage (short). Discon-
nect the backlight wires at the HMI, if the E53 error code reoccurs,
replace the HMI. If the error does not reoccur, replace the LCD.
Head Travel
Limit
E54
Head too
High/Low
1) Select different
board thickness.
2) Consult the man-
ual.
The E54 error code is displayed when the user is trying to make an
auto-drop that would position the head beyond the upper or lower
head limits.
Engine ECU
Power
E55
Engine ECU
Undetected
1) Inspect wiring for
damage.
2) Consult the man-
ual.
The E55 error code indicates that the ECM has detected that the
circuit for "ECU Power" on the Yanmar engine is not drawing
enough current (open circuit). This can be caused by damaged
(open) wiring on the engine harness, an open coil on the actuator
relay, a defective ECM, or possibly a defective engine ECU.
Possible Solution(s):
Carefully inspect red wire #5 that runs from the ECM (P1.3) to the
engine harness round connector (P1.G) for any kind of damage
(open), if wire looks OK, consult engine manufacturer's wiring doc-
umentation for wire routing on engine, inspect wiring on engine. If
no wiring issues are detected, inspect actuator relay for open coil,
if OK, problem is either defective circuit within the ECM or a bad
engine ECU.
Throttle
Error
E56
Throttle
Relay
Undetected
1) Make sure throttle
relay is plugged in.
2) Inspect wiring for
damage.
3) Consult the man-
ual.
The E56 error code indicates that the ECM has detected that the
circuit for the engine throttle command is not drawing enough cur-
rent (open circuit). This can be caused by damaged (open) wiring
to the throttle relay assembly, An open throttle relay coil, or a
defective circuit within the ECM.
Possible Solution(s):
Inspect wiring going to the throttle relay assy. for damage (open).
Disconnect white wire #48 from the white wire of throttle relay
assembly, using a properly grounded test light (not a meter) probe
the white wire from the ECM (the light will act as the load), if E56
error does not reoccur, problem is an open wire in the relay assy.
or a defective throttle relay. If E56 does reoccur, problem is either
in the harness or the ECM.
