JLG 3248RS/10RS Service Manual - Manual (Page 122)

SECTION 6 - DIAGNOSTIC TROUBLE CODES
6-12 – JLG Lift – 3121273
4-2 Thermal Limit (SOA)
DTC FAULT MESSAGE DESCRIPTION CHECK
421 POWER MODULE TOO HOT -
PLEASE WAIT The System Module's internal tempera-
ture is excessive (>+75° C). Allow to
cool by powering down. • Power down and allow to cool.
• Do not operate in ambients over 140° F (60° C).
• Check for jammed or obstructed drive motors.
• Check for excessively high current consumption in the pump,
ANALYZER -> DIAGNOSTICS -> PUMP -> PUMP CUR over 130
Amps with an empty deck.
• Check for excessively high traction current consumption, ANA-
LYZER -> DIAGNOSTICS -> TRACTION -> ARM CUR over 120
Amps while driving on the level.
• HEALTH (Status LED) - ON
422 DRIVING AT CUTBACK -
POWER MODULE CURRENT
LIMIT Armature current was greater than
250A for at least 60 seconds. To avoid
damage to the vehicle, the System
Module has reduced the current limit to
120A. • Check for jammed or obstructed drive motors.
• Check for excessively high traction current consumption, ANA-
LYZER -> DIAGNOSTICS -> TRACTION -> ARM CUR over 120
Amps while driving on the level.
• HEALTH (Status LED) - ON
423 LIFT UP AT CUTBACK -
POWER MODULE CURRENT
LIMIT Pump current was greater than 150A for
at least 60 seconds. To avoid damage
to the vehicle, the System Module has
reduced the current limit to 80A • Check for jammed or obstructed arm stack or pivot bushing.
• Check for excessively high current consumption in the pump,
ANALYZER -> DIAGNOSTICS -> PUMP -> PUMP CUR over 130
Amps with an empty deck.
• Refer to Section 4.3, Pump/Motor.
• HEALTH (Status LED) - ON
4-4 Battery Supply
DTC FAULT MESSAGE DESCRIPTION CHECK
441 BATTERY VOLTAGE TOO
LOW - SYSTEM SHUTDOWN Battery Voltage momentarily dropped
below 14.5V when using flooded lead-
acid batteries, or 16.0V when using
AGM batteries. With a low battery
charge, this can occur during heavy
current demand due to Drive, Steer, or
Lift Up. • Recharge batteries or check for damaged batteries.
• Check battery charger function.
• HEALTH (Status LED) - ON
442 BATTERY VOLTAGE TOO
HIGH - SYSTEM SHUTDOWN The System Module momentarily mea-
sured excessively high battery voltage
(>36.0V) and de-energized the Main
Line Contactor and Battery Relay to pro-
tect system devices. • May be due to improper battery charging or incorrect voltage bat-
teries being used.
• HEALTH (Status LED) - ON
446 LOGIC SUPPLY VOLTAGE
OUT OF RANGE The system module logic supply volt-
age was measured to be out of normal
operating range by the interface PCB
(<11V). • This may be caused by a loose battery terminal, severely dis-
charged batteries, damaged battery, or an improper wire harness
connection.
• Drive, Steer, and Lift Prevented
• HEALTH (Status LED) - ON
4421 LOGIC SUPPLY VOLTAGE
OUT OF RANGE The system module logic supply volt-
age was measured by the power PCB to
be more than 34V for 10uS. • This may be caused by a loose battery terminal, severely dis-
charged batteries, damaged battery, or an improper wire harness
connection.
• Drive, Steer, and Lift Prevented
• HEALTH (Status LED) - ON