Service Manual

SECTION 6 - TROUBLESHOOTING
6-26 – JLG Lift – 3121228
Code 23 - Horn - Disconnected
Check For These Obvious Conditions First:
• Is machine equipped with a horn unit.
Code 24 - P1-Auxiliary #1 Circuit - Short Circuit
Check For These Obvious Conditions First:
• Damaged wiring in the Auxiliary #1 Component wiring harness or a damaged Component.
Table 6-24. Code 23 - Horn - Disconnected
STEP ACTION SPEC YES NO
1. Is machine equipped with a horn unit.
— Go to Step 3 Got to Step 2
2. At the Ground Control Module enter the programming mode, check if the
horn open circuit detection is enabled.
— Disable It Replace Ground
Control Module
3. Check voltage at the P1 connector on the Ground Control Module between
pin-14 and pin-7. Is reading within specification?
2 - 4 V DC Replace Ground
Control Module
Go to Step 4
4. Remove the wire terminals at the horn, check continuity of each of the wires
from pins-14 and 7 on the P1 connector to the horn end.
— Replace the
Horn
Repair or
Replace Wiring
Table 6-25. Code 24 - P1-Auxiliary #1 Circuit - Short Circuit
STEP ACTION SPEC YES NO
1. At the Ground Control Module, P1 connector, check the voltage across
pins-9 and 2 to the Aux. #1 component. Is reading within specification?
0 - 2V DC Go to Step 2 Replace Ground
Control Module
2. Remove the wire terminals at the Aux. #1 component, check continuity of
each of the wires from pins-9 and 2 on the P1 connector to the Aux. #2
component end.
— Replace the
Component
Repair or
Replace Wiring