SECTION 6 - DIAGNOSTIC TROUBLE CODES
6-14 – JLG Lift – 3121166
662 CANBUS FAILURE - PLAT-
FORM MODULE
In platform mode, the control system
failed to receive messages from the plat-
form board.
• Turn on machine in ground mode. If DTC 661 is not present check
for 24V between platform box connector 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 connector socket
J1-7.
• If DTC 661 was present in the previous check, disconnect arm-
stack passthru connector located near the ladder on the left. Turn
on in ground mode. If DTC 661 is not present then there is a prob-
lem in armstack harness. Armstack passthru socket 5 to platform
box terminal E should have continuity. Armstack passthru socket
6 to platform box connector terminal F should have continuity.
Armstack passthru socket 7 to platform box connector terminal G
should have continuity. 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 measure open circuit.
• Disconnect armstack passthru and ground board J1. Armstack
passthru pin 5 to ground board socket J1-11 should have conti-
nuity. 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 circuit.
• Disconnect ground board J1 and power module connector.
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 cir-
cuit. Ground board socket J1-32 to J1-33 should measure open
circuit.
• Ensure all connections opened above are reconnected. Discon-
nect 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
662
(Cont.)
CANBUS FAILURE - PLAT-
FORM MODULE
(Continued)
In platform mode, the control system
failed to receive messages from the plat-
form board.
• Disconnect platform box connector. Open platform box. Discon-
nect platform board connector. Platform box socket E to platform
board J1-3 should have continuity. Platform box socket F to plat-
form board J1-4 should have continuity. Platform box pin E to pin
F should measure open circuit. Platform box pin E to pin G should
measure open circuit. Platform box pin F to pin G should measure
open circuit. If these checks are OK replace platform board.
6-6 Communication
DTC FAULT MESSAGE DESCRIPTION CHECK
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