JLG 3246ES Service Manual - Manual (Page 137)

SECTION 5 - JLG CONTROL SYSTEM
3121166 – JLG Lift – 5-17
3 3 RIGHT BRAKE OPEN CIRCUIT
The ground board did not detect current flow to the right brake
during normal operation.
Check for continuity through
this circuit. Inspect the wiring
for physical damage.
Replace ground board.
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 ther-
mal 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 CURRENT
LIMIT
The drive portion of the Power Module has reached thermal
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
LIFT UP AT CUTBACK -- POWER MODULE CURRENT LIMIT
The lift up portion of the power module has reached thermal
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
BATTERY VOLTAGE TOO LOW – SYSTEM SHUTDOWN
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
BATTERY VOLTAGE TOO HIGH – SYSTEM SHUTDOWN
The Power Module momentarily measured excessively high
battery voltage (>37.0v) and the ground module de-ener-
gized 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 Ignition Relay and
suppress all Help Messages caused by the lack of Ignition Sig-
nal. 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 Sensing
System module measured battery voltage >34.0Vdc, which
may compromise ability to predict weight.
LSS Module Message – Status Message (0x81) is reporting
“BATT TOO HIGH” AND [Machine Setup’s LOAD is set to 1=CUT-
OUT PLT OR 2=CUTOUT ALL]. Vehicle assumed to be Over-
loaded.
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 Sensing
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 reporting
“BATT TOO LOW” AND [Machine Setup’s LOAD is set to 1=CUT-
OUT 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