JLG 1200SJP Service Maintenance Manual page 503

STEP ACTION REQUIRED
1 Install the Analyzer at the ground station, scroll to the "Diag-
nostics" sub level menu, press "enter" then scroll to the "Ver-
sions" menu item press "enter" and view the screen,
reference the Diagnostics / Version Chart to assist you in
determining which module has lost it' s communication link.
In some cases the module that shows up with a question may
be defective if all other CANbus links check OK.
2 Disconnect the BLAM J1 deutsche plug connection at the "T"
fitting just above the fuel tank. Perform an ohms check at the
"A" and "B" pins of the "T" fitting. Inspect the shield wire "C"
for possible short.
3 Disconnect the Chassis Module communication harness from
the BLAM "T" fitting and Chassis Module plug connection at
the battery. Perform a continuity test.
4 Verify the CANbus link signal wires are installed correctly at
the Chassis Module plug connection at the battery and at the
plug below the swivel.
5 Verify continuity at the Chassis Module harness from the plug
connection at the battery down to the plug connection
below the swivel.
6 Disconnect the Chassis Module plug connection below the
swivel and perform an ohms check at the #1 and #2 of the
plug. Inspect the shield wire #3 plug connection for possible
short.
3121142
Table 6-9. Troubleshooting: Chassis Can Communications Lost
See Diagnostics / Version Chart
Approximately 60 ohms.
Continuity
Electrical Schematic
Continuity
Approximately 120 Ohms
– JLG Lift –
SECTION 6 - JLG CONTROL SYSTEM
SPEC
See step 2
CANbus circuit is com-
plete. Chassis Module
suspected defective.
Reconnect harness and go to
step 4
Reconnect plug and go to step 6
Reconnect plug and go to step 6
Stop
YES NO
See step 2
Reconnect plug and go to step 3
Repair or replace BLAM and
Chassis Module harness.
Wire per Electrical Schematic
Repair or replace Chassis Mod-
ule harness.
Replace Chassis Module
6-127