JLG 3248RS/10RS Service Manual - Manual (Page 123)

SECTION 6 - DIAGNOSTIC TROUBLE CODES
3121273 – JLG Lift – 6-13
4422 LOGIC SUPPLY VOLTAGE
OUT OF RANGE The system module logic supply volt-
age was measured by the power PCB to
be less than 11V 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
6-6 Communication
DTC FAULT MESSAGE DESCRIPTION CHECK
661 CANBUS FAILURE - POWER
MODULE The control system failed to receive
messages from the power micropro-
cessor. • This may occur if re-programming was interrupted.
• Alternately, this may be an internal fault.
• HEALTH (Status LED) - ON
6643 CANBUS FAILURE - LSS
ANGLE SENSOR The control system failed to receive
messages from the angle sensor. • Check wiring to the Angle Sensor.
• HEALTH (Status LED) - ON
7-7 Electric Motor
DTC FAULT MESSAGE DESCRIPTION CHECK
772 STALLED TRACTION MOTOR
OR POWER WIRING ERROR The System Module detected armature
current feedback > 4.5V or < 0.5V. • This is mostly likely caused by a stalled traction motor or power
wiring issue. Alternately, it could be an internal fault.
• HEALTH (Status LED) - ON
773 CAPACITOR BANK FAULT -
CHECK POWER CIRCUITS There is an internal or external fault that
prevents the System Module’s capaci-
tor bank from charging. • The System Module detected that the VMN of the pump and trac-
tion has not increased more than 1.3V in 1000mS. Alternately,
the VMN of the pump or traction is less than 20% of battery volt-
age.
• If this message persists after disconnecting the drive and pump
wiring, there is an internal fault.
• HEALTH (Status LED) - ON
774 SHORT CIRCUIT - FIELD
WIRING The field wiring passed System Module
power-up diagnostics. However, an
external short circuit was detected
when current was applied to F1 / F2. • This situation is caused by improper field wiring or a damaged
motor.
• HEALTH (Status LED) - ON
775 OPEN CIRCUIT - FIELD WIR-
ING The System Module applied field cur-
rent, but could regulate the desired cur-
rent. • The situation is caused by improper field wiring or a damaged
motor.
• HEALTH (Status LED) - ON
776 STALLED PUMP MOTOR OR
POWER WIRING ERROR The System Module measured
improper pump current feedback
(>4.5V or <0.5V) for 240mS. • This is caused by a stalled pump motor, a power wiring issue, or
a System Module malfunction.
• HEALTH (Status LED) - ON
777 OPEN CIRCUIT PUMP
MOTOR WIRING This indicates there is an open-circuit
between the System Module’s –P ter-
minal and the pump motor. • The System Module measured pump current less than 8A while
the motor voltage was greater than 7V for 1200mS.
• HEALTH (Status LED) - ON
778 TRACTION T HIGH - CHECK
POWER CIRCUITS While driving, the voltage measured at
the System Module’s T-terminal did not
agree with the predicted value. • This issue may be caused by a power wiring error or an internal
fault.
• HEALTH (Status LED) - ON
4-4 Battery Supply
DTC FAULT MESSAGE DESCRIPTION CHECK