SECTION 5 - JLG CONTROL SYSTEM
3121166 – JLG Lift – 5-17
Help messages with the 4-2 flash code indicate a thermal problem.
4 2 POWER MODULE TOO HOT – PLEASE WAIT The Power Module for drive, steer, and lift up has reached
thermal cutout. Allow to cool by powering down.
The power Module is reporting a "Unit Too Hot" fault code.
4 2 DRIVING AT CUTBACK -- POWER MODULE CUR-
RENT LIMIT
The drive portion of the Power Module has reached ther-
mal limit. Allow to cool by waiting for temperature to fall.
The Power Module is reporting a "I
2
T Drive Current LImit"
fault code.
4 2 L IFT UP AT CU TBACK -- POWE R MODULE CUR-
RENT LIMIT
The lift up portion of the power module has reached ther-
mal limit. Allow to cool by waiting for temperature to fall.
The POwer Module is reporting "I
2
Pump Current LImit"
fault code.
Help messages with the 4-4 flash code indicate a battery supply problem.
4 4 B ATTERY VOLTAGE TOO LOW – SYS TEM SHUT-
DOWN
Battery Voltage momentarily dropped below 14.5V. With a
low battery charge, this can occur during heavy current
demand due to drive, steer, or lift up.
The Power Module is reporting a “Low Battery” Fault Code
(7d).
Drive, Steer, & Lift Up Prevented
Recharge batteries or check
for damaged batteries.
4 4 B ATTERY VOLTAGE TOO HIGH – SYSTEM SHU T-
DOWN
The Power Module momentarily measured excessively
high battery voltage (>37.0v) and the ground module de-
energized the ignition relay to protect system devices.
The Power Module is reporting a “High Battery” Fault Code
(8d) OR
a “High Battery without Line” Fault Code (10d). In
response, the Ground Module shall de-energize the Igni-
tion Relay and suppress all Help Messages caused by the
lack of Ignition Signal. This fault is latched until the next
power-cycle.
Drive, Steer, & Lift Prevented.
This may be due to improper
battery charging or incorrect
voltage batteries being used.
4 4 LSS BATTERY VOLTAGE TOO HIGH
While the Load Sensing System is enabled, the Load Sens-
ing System module measured battery voltage >34.0Vdc,
which may compromise ability to predict weight.
LSS Module Message – Status Message (0x81) is report-
ing “BATT TOO HIGH” AND
[Machine Setup’s LOAD is set
to 1=CUTOUT PLT OR
2=CUTOUT ALL]. Vehicle
assumed to be Overloaded.
This may be due to improper
battery charging or incorrect
voltage batteries being used.
4 4 LSS BATTERY VOLTAGE TOO LOW
While the Load Sensing System is enabled, the Load Sens-
ing System module measured battery voltage <9.0vdc,
which may compromise ability to predict weight. With a low
battery charge, this can occur during heavy current
demand due to drive, steer, or lift up.
LSS Module Message – Status Message (0x81) is report-
ing “BATT TOO LOW” AND
[Machine Setup’s LOAD is set
to 1=CUTOUT PLT OR
2=CUTOUT ALL].
Vehicle assumed to be Overloaded.
Recharge batteries or check
for damaged batteries.
Table 5-2. Flash Code Listing
FLASH
CODE
HELP MESSAGE CAUSE POSSIBLE RESOLVE
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