JLG 3246ES Service Manual - Manual (Page 170)

SECTION 6 - DIAGNOSTIC TROUBLE CODES
6-18 – JLG Lift – 3121166
773 CAPACITOR BANK
FAULT - CHECK POWER
CIRCUITS Drive, Steer, and Lift Prevented • There is an internal or external fault that prevents the
System Module’s capacitor bank from charging.
• The System Module detected that the VMN of the
pump and traction has not increased more than 1.3V
in 1000mS. Alternately, the VMN of the pump or trac-
tion is less than 20% of battery voltage.
• If this message persists after disconnecting the drive
and pump wiring, there is an internal fault.
• ZAPI - HEALTH (Status LED) - ON
774 SHORT CIRCUIT FIELD
WIRING Drive, Steer, and Lift Prevented • The field wiring passed System Module power-up
diagnostics. However, an external short circuit was
detected when current was applied to F1 / F2. This sit-
uation is caused by improper field wiring or a dam-
aged motor.
• ZAPI - HEALTH (Status LED) - ON
NOTE: Tilt Sensor Calibration is not available when this
condition is present.
775 OPEN CIRCUIT FIELD
WIRING Drive, Steer, and Lift Prevented • The System Module applied field current, but could
regulate the desired current. The situation is caused
by improper field wiring or a damaged motor.
• ZAPI - HEALTH (Status LED) - ON
776 STALLED PUMP MOTOR
OR POWER WIRING
ERROR Drive, Steer, and Lift Prevented • The System Module measured improper pump cur-
rent 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.
• ZAPI - HEALTH (Status LED) - ON
777 OPEN CIRCUIT PUMP
MOTOR WIRING Drive, Steer, and Lift Prevented • The System Module measured pump current less
than 8A while the motor voltage was greater than 7V
for 1200mS. This indicates there is an open-circuit
between the System Module’s –P terminal and the
pump motor.
• ZAPI - HEALTH (Status LED) - ON
778 TRACTION T HIGH -
CHECK POWER CIR-
CUITS Drive, Steer, and Lift Prevented • While driving, the voltage measured at the System
Module’s T terminal did not agree with the predicted
value for at least 300mS. This issue may be caused by
a power wiring error or an internal fault.
• ZAPI - HEALTH (Status LED) - ON
779 TRACTION T LOW -
CHECK POWER CIR-
CUITS Drive, Steer, and Lift Prevented • While driving, the voltage measured at the System
Module’s T terminal did not agree with the predicted
value for at least 1000mS. This issue may be caused by
an opencircuit of the armature wiring (+B and –T ter-
minals) or an internal fault.
• VMN does not increase more than 1.3V
• VMN is less than 20% Battery Voltage
• Battery Voltage . VMN is greater than 4V
• ZAPI - HEALTH (Status LED) - ON
7-7 Electric Motor
DTC FAULT MESSAGE DESCRIPTION CHECK