JLG 1230ES Service Manual - Manual (Page 144)

SECTION 8 - DIAGNOSTIC TROUBLE CODES
8-12 – JLG Lift – 3121222
338 STEER LEFT OPEN CIRCUIT The ground board did not detect current
flow to the steer left solenoid during nor-
mal operation.
• Check for continuity through this circuit. Steer left solenoid resis-
tance should measure about 30 Ohms. The steer left solenoid is
powered with 24V from ground board J1-21, and its ground is to
ground board J1-30, 37.
• Inspect the wiring for physical damage.
• Replace ground board.
339 STEER RIGHT SHORT TO
BATTERY The ground board detected voltage while
the steer right solenoid was commanded
off. • Check for continuity through this circuit. Steer right solenoid
resistance should measure about 30 Ohms. The steer right sole-
noid is powered with 24V from ground board J1-22, and its
ground is to ground board J1-30, 37.
• Inspect the wiring for physical damage.
• Replace ground board.
3310 STEER RIGHT OPEN CIR-
CUIT The ground board did not detect current
flow to the steer right solenoid during nor-
mal operation. • Check for continuity through this circuit. Steer right solenoid
resistance should measure about 30 Ohms. The steer right sole-
noid is powered with 24V from ground board J1-22, and its
ground is to ground board J1-30, 37.
• Inspect the wiring for physical damage.
• Replace ground board.
3311 GROUND ALARM SHORT TO
BATTERY The ground board detected voltage while
the ground alarm was commanded off. • Check for continuity through this circuit. The ground alarm sole-
noid is powered with 24V from ground board J1-19, its PWM sig-
nal is from ground board J1-28, and its ground is to ground board
J1-30, 37. There should be about 1500 Ohms between ground
alarm connector pin 1 and pin 3.
• Inspect the wiring for physical damage.
• Replace ground board.
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 commanded off during power-up. • Check for continuity through this circuit. Brake solenoid resis-
tance 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 CIRCUIT Current flow to the left brake solenoid was
not detected during 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 oper-
ation. • Check for continuity through this circuit. Brake solenoid resis-
tance 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.
3-3 Ground Output Driver
DTC FAULT MESSAGE DESCRIPTION CHECK