Code 40 - Obstruction Sensor System - No Communication With Ground Control Module - JLG 15MVL Series Service Maintenance Manual

SECTION 6 - TROUBLESHOOTING

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 6-38. Code 40 - OSS - No Communication with Ground Control Module
STEP
1. Is machine equipped with an OSS system?
2. At the Ground Control Module, enter programming mode and view if OSS is
enabled. Is OSS enabled?
3. In Service Level Programming mode, Disable Obstruction Senor System.
4. With machine powered up, check if the RED LED is lit on the front of the OSS
Module.
5. Check continuity from pin-9 on the OSS module (9-pin connector) to the
platform junction box pin-2 (4-pin connector).
6. Check continuity from platform junction box pin-2 (4-pin connector) to the
Ground Control Module (P-4 connector) pin-7.
7. Check continuity from pin-9 on OSS module (9-pin connector) to the
Ground Control Module (P-4 connector) pin-7.
8. Program the Ground Control Module to Disable the OSS System. Does fault
condition still appear?
9. Replace the Obstruction Sensor System and check for fault.
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.
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.
12. At the Ground Control Module (P-4 connector) check voltage between pin-8
and pin-2, place positive (+) lead on pin-8.
6-34
ACTION
– JLG Lift –
SPEC YES
— Got to Step 4
X = No Go to Step 3
X=No —
— Go to Step 5
— Go To Step 6
— Go to Step 7
— Go to Step 8
— Replace the Ground
Control Module
— Replace the Ground
Control Module
24V (DC) Replace the OSS
Module
24V (DC) Repair or Replace,
OSS to Junction Box
Wire Harness
24V (DC) Repair or Replace,
Junction Box to
Ground Control
Module
Wire Harness
NO
Go to Step 2
Replace Ground
Control Module
—
Go to Step 10
Inspect Wiring
and Harness
Connectors
Inspect Wiring
and Harness
Connectors
Inspect
Connection at the
Platform Junction
Box
Go to Step 9
—
Go to Step 11
Go to Step 12
Replace Ground
Control Module
3121231