Service Manual Owner's manual

SECTION 8 - DIAGNOSTIC TROUBLE CODES
3121222 – JLG Lift – 8-17
775 OPEN CIRCUIT FIELD WIR-
ING
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 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.
• 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 indi-
cates 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 CIRCUITS
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 CIRCUITS
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 terminals) 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
7710 PUMP P HIGH - CHECK
POWER CIRCUITS
Drive, Steer, and Lift Prevented • While steering or lifting up, the voltage measured at the System
Module’s P terminal did not agree with the predicted value for at
least 240mS. This issue may be caused by a power wiring error
or an internal fault.
• Pump Feedback . Predicted >7V
• ZAPI - HEALTH (Status LED) - ON
7711 PUMP P LOW - CHECK
POWER CIRCUITS
Drive, Steer, and Lift Prevented • While steering or lifting up, the voltage measured at the System
Module’s P terminal did not agree with the predicted value for at
least 1000mS. This issue may be caused by an open-circuit of
the pump wiring (+BF2 and –P terminals) or an internal fault.
• Pump feedback does not increase more than 1.3V
• Pump feedback is less than 20% Battery Voltage
• Battery Voltage - pump feedback is greater than 4V
• ZAPI - HEALTH (Status LED) - ON
7741 ARMATURE BRAKING CUR-
RENT TOO HIGH
Drive, Steer, and Lift Prevented • The System Module detected excessive braking current for more
than 5000mS. This can be caused by transporting an excessive
load on a steep grade. Alternately, this may indicate an internal
fault.
• ZAPI - HEALTH (Status LED) - ON
7-7 Electric Motor
DTC FAULT MESSAGE DESCRIPTION CHECK