JLG 15/20MSP Service Manual - Manual (Page 149)

SECTION 6 - TROUBLESHOOTING
3121231 – JLG Lift – 6-29
Code 25 - Auxiliary #1 Circuit - Disconnected
Check For These Obvious Conditions First:
• Is machine equipped with a component on the Auxiliary #1 circuit.
Code 26 - Auxiliary #2 - Short Circuit
Check For These Obvious Conditions First:
• Damaged wiring in the Auxiliary #2 Component wiring harness or a damaged Component.
Table 6-29. Code 25 - Auxiliary #1 Circuit - Disconnected
STEP ACTION SPEC YES NO
1. Is machine equipped with a component on the Auxiliary #1 circuit. — Go to Step 3 Got to Step 2
2. At the Ground Control Module enter the programming mode, check if the
Auxiliary #1 open circuit detection is enabled. Default = NO Disable It Replace Ground
Control Module
3. Check voltage at the P1 connector on the Ground Control Module between
pin-9 and pin-2. Is reading within specification? 2 - 4 V DC Replace Ground
Control Module
Go to Step 4
4. 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. #1
component. — Replace the
Component Repair or
Replace Wiring
Table 6-30. Code 26 - Auxiliary #2 - Short Circuit
STEP ACTION SPEC YES NO
1. At the Ground Control Module, P1 connector, check the voltage across
pins-8 and 1 to the Aux. #2 component. Is reading within specification? 0 - 2V DC Go to Step 2 Replace Ground
Control Module
2. Remove the wire terminals at the Aux. #2 component, check continuity of
each of the wires from pins-8 and 1 on the P1 connector to the Aux. #2
component end. — Replace the
Component Repair or
Replace Wiring