JLG 3246ES Service Manual - Manual (Page 168)

SECTION 6 - DIAGNOSTIC TROUBLE CODES
6-16 – JLG Lift – 3121166
662 CANBUS FAILURE - PLAT-
FORM MODULE In platform mode, the control
system failed to receive mes-
sages from the platform board. • Turn on machine in ground mode. If DTC 661 is not
present check for 24V between platform box connec-
tor terminals D and A. If not 24V, test continuity from
platform box connector socket A to ground board
connector socket J1-6 and test continuity from plat-
form box connector socket D to ground board con-
nector socket J1-7.
• If DTC 661 was present in the previous check, discon-
nect armstack passthru connector located near the
ladder on the left. Turn on in ground mode. If DTC 661
is not present then there is a problem in armstack har-
ness. Armstack passthru socket 5 to platform box ter-
minal E should have continuity. Armstack passthru
socket 6 to platform box connector terminal F should
have continuity. Armstack passthru socket 7 to plat-
form box connector terminal G should have continu-
ity. Armstack passthru socket 5 to armstack passthru
socket 6 resistance should be 120 Ohms +/- 5%. Arm-
stack passthru socket 5 to armstack passthru socket 7
should measure open circuit. Armstack passthru
socket 6 to armstack passthru socket 7 should mea-
sure open circuit.
• Disconnect armstack passthru and ground board J1.
Armstack passthru pin 5 to ground board socket J1-11
should have continuity. Armstack passthru pin 6 to
ground board socket J1-12 should have continuity.
Armstack passthru pin 7 to ground board socket J1-13
should have continuity. Armstack passthru pin 5 to
armstack passthru pin 6 should measure open circuit.
Armstack passthru pin 5 to armstack passthru pin 7
should measure open circuit. Armstack passthru pin 6
to armstack passthru pin 7 should measure open cir-
cuit.
• Disconnect ground board J1 and power module con-
nector. Ground board socket J1-31 to power module
connector socket 10 should have continuity. Ground
board socket J1-32 to power module connector
socket 11 should have continuity. Ground board
socket J1-31 to J1-32 should measure open circuit.
Ground board socket J1-31 to J1-33 should measure
open circuit. Ground board socket J1-32 to J1-33
should measure open circuit.
• Ensure all connections opened above are recon-
nected. Disconnect power module connector. Turn on
in platform mode. If DTC 662 is no longer present
replace power module.
• If DTC 661 and 662 have been present through above
steps replace ground board.
Continued Next Page
6-6 Communication
DTC FAULT MESSAGE DESCRIPTION CHECK