JLG DVSP Series Service Manual - Manual (Page 141)

SECTION 6 - TROUBLESHOOTING
3121136 – JLG Lift – 6-27
Code 40 - Obstruction Sensor System - No Communication with Ground Control Module
Check For These Obvious Conditions First:
• Is machine equipped with an Obstruction Sensor System?
• Are the electrical harness connectors from the OSS Module through the Platform Junction Box to the Ground Control
Module tight and undamaged?
Table 6-35. Code 40 - OSS - No Communication with Ground Control Module
STEP ACTION SPEC YES NO
1. Is machine equipped with an OSS system?
— Got to Step 4 Go to Step 2
2. At the Ground Control Module, enter programming mode and view if
OSS is enabled. Is OSS enabled?
X = No Go to Step 3
Replace Ground
Control Module
3. In Service Level Programming mode, Disable Obstruction Senor
System.
X=No — —
4. With machine powered up, check if the RED LED is lit on the front of
the OSS Module.
— Go to Step 5 Go to Step 10
5. Check continuity from pin-9 on the OSS module (9-pin connector)
to the platform junction box pin-2 (4-pin connector).
— Go To Step 6
Inspect Wiring
and Harness
Connectors
6. Check continuity from platform junction box pin-2 (4-pin connec-
tor) to the Ground Control Module (P-4 connector) pin-7.
— Go to Step 7
Inspect Wiring
and Harness
Connectors
7. Check continuity from pin-9 on OSS module (9-pin connector) to
the Ground Control Module (P-4 connector) pin-7.
— Go to Step 8
Inspect
Connection at the
Platform Junc-
tion Box
8. Program the Ground Control Module to Disable the OSS System.
Does fault condition still appear?
—
Replace the
Ground Control
Module
Go to Step 9
9. Replace the Obstruction Sensor System and check for fault.
—
Replace the
Ground Control
Module
—
10. Disconnect 9-pin connector at the OSS Module. Place a positive
(+) lead on Pin-1 and a negative (–) lead on pin-5. Check for 24v
DC.
24V (DC)
Replace the OSS
Module
Go to Step 11
11. Check the wiring harness from the Platform Junction Box connector
to the Ground Control Module, positive (+) lead on pin-1 to negative
(–) lead on pin-4. Check for 24v DC.
24V (DC)
Repair or
Replace, OSS to
Junction Box
Wire Harness
Go to Step 12