JLG 3246ES Service Manual - Manual (Page 165)

SECTION 6 - DIAGNOSTIC TROUBLE CODES
3121166 – JLG Lift – 6-13
3312 LEFT BRAKE SHORT TO
BATTERY
The ground board detected
voltage while the left brake was
commanded off. • Check for continuity through this circuit. The left
brake is powered with 24V from ground board J1-23,
and its ground is to ground board J1-30, 37. Brake
solenoid resistance should measure about 20 Ohms.
• Inspect the wiring for physical damage.
• Replace ground board.
3313 RIGHT BRAKE SHORT TO
BATTERY
Voltage was detected on the
right brake solenoid when the
ground board output was com-
manded off during power-up. • Check for continuity through this circuit. Brake sole-
noid resistance should measure about 20 Ohms. The
right brake is powered with 24V from ground board
J1-24, and its ground is to ground board J1-30, 37.
• Inspect the wiring for physical damage.
• Replace ground board.
3314 LEFT BRAKE OPEN CIR-
CUIT
Current flow to the left brake
solenoid was not detected dur-
ing normal left brake operation. • Check for continuity through this circuit. The left
brake is powered with 24V from ground board J1-23,
and its ground is to ground board J1-30, 37. Brake
solenoid resistance should measure about 20 Ohms.
• Inspect the wiring for physical damage.
• Replace ground board.
3315 RIGHT BRAKE OPEN CIR-
CUIT
The ground board did not
detect current flow to the right
brake during normal operation. • Check for continuity through this circuit. Brake sole-
noid resistance should measure about 20 Ohms. The
right brake is powered with 24V from ground board
J1-24, and its ground is to ground board J1-30, 37.
• Inspect the wiring for physical damage.
• Replace ground board.
33297 LEFT BRAKE - SHORT TO
GROUND
Drive and Steer Prevented • Excessive current flow to the Left Brake Solenoid was
detected (J1-34 NLB).
• ZAPI - HEALTH (Status LED) - ON
33298 STEER LEFT VALVE -
SHORT TO GROUND
Drive, Steer and Lift Up Pre-
vented • Excessive current flow to the steer left solenoid
detected (J2-9 NLV).
• ZAPI - HEALTH (Status LED) - ON
33299 LINE CONTACTOR COIL -
SHORT TO BATTERY
Drive, Lift and Steer Prevented • Voltage from an external source was detected on the
Negative Main Line Contactor.
• ZAPI - HEALTH (Status LED) - ON
33302 NEGATIVE SUPPLY -
SHORT TO BATTERY
Drive, Lift, and Steer Prevented • At power-up, the system module detected an external
short on J1-12, J1-17, J1-23, J2-14 or J2-15. Normally
these pins are grounded by the System Module. All
functions are prevented to protect the control system.
• ZAPI - HEALTH (Status LED) - ON
33303 NEGATIVE SUPPLY -
SHORT TO GROUND
Drive, Lift and Steer Prevented • At power-up, the System Module detected an external
short on J1-12, J1-17, J2-14 or J2-15. Normally these
pins are grounded by the System Module. Since the
external ground may compromise integrity, all func-
tions will be prevented.
• ZAPI - HEALTH (Status LED) - ON
33304 RIGHT BRAKE - SHORT
TO GROUND
Drive, and Steer Prevented • Excessive current flow to the Right Brake solenoid was
detected (J1-33 NRB).
• ZAPI - HEALTH (Status LED) - ON
3-3 Ground Output Driver
DTC FAULT MESSAGE DESCRIPTION CHECK