JLG X20JP - X600AJ Service Manual - Manual (Page 231)

SECTION 6 - JLG CONTROL SYSTEM
3121623 – JLG Lift – 6-15
Figure 6-37.
Anytime that you have replaced a connection, connecting
the battery disconnect and turning ON ignition switch,
check if CAN BUS error disappear. This operation is nec-
essary to check not only the continuity of the wires but
also the status, because it could happen that a wire is
scratched so even maintaining the continuity it introduces
a disturb into the signal
NOTE: Exchanging the wires H and L the system doesn’t work, so
it’s important to replace each connection as was origi-
nally.
PROCEEDING EXAMPLE: Always changing the connec-
tions configuration with battery disconnect disconnected,
connect two external wires (red lines here below) between
ECM1-2 and ECM3, disconnecting the original wires on
this tract, then check the status: if with this configuration
the error doesn’t disappear means that the failure is on a
device, otherwise if the error disappears it means that the
failure was in the original connections (it could be possi-
ble that it appears “SEN 3 FAIL” à2
nd cylinder sensor
missing). Then, in case we detected the problem on the
connection, replacing the original connections and substi-
tuting only the connection between ECM1-2 and the JIB
CONNECTOR SCHEDULE with and external couple of
wires (green lines here below), check the status, if the
error appear it means that the failure was on this tract orig-
inal connection, otherwise if the error disappear check the
other possible tracts.
H
L