SECTION 7 - DIAGNOSTIC TROUBLE CODES
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7-1
SECTION 7. DIAGNOSTIC TROUBLE CODES
7.1
INTRODUCTION
This section provides a reference for Diagnostic Trouble
Codes (DTC) read from the Multifunction Digital Indicator
(MDI) or a handheld analyzer. For more information on any
sensors or indicators, refer to the appropriate manual sec-
tion. Many of the checks below require configuring and
using a multimeter. Refer to Section 8: General Electrical
Information & Schematics for multimeter basics. To trou-
bleshoot multiple DTCs, start with the DTC with the higher
first two digits. The machine is powered by four 6 Volt bat-
teries in series, providing a nominal 24 Volts to the control
system. Some procedures below refer to this nominal volt-
age (VMN) as 24V. Actual voltage measurements may dif-
fer based on the charge of the batteries.
If a correction is
made during a check, conclude the check by cycling
the machine power, using the emergency stop switch.
It may also be helpful to run a system test, ANALYZER ->
SYSTEM TEST for intermittent or difficult problems.
System Fault/DTC Indication
In addition to the DTC codes being displayed on the MDI
and handheld analyzer, DTC codes are indicated by the
number of flashes and pauses of the System Fault indica-
tor on the face of the platform control box as shown
below:
7.2
DIAGNOSTIC TROUBLE CODES (DTC)
The DTC tables following are sorted in groups by the first
two digits, these digits represent the number of flashes
the system distress indicator lamp will flash on the plat-
form indicator panel when a fault occurs.
For example: a “211” on page 7-3 - Power Up would be
indicated by 2 flashes, a pause, then 1 flash, a pause, then
would keep repeating until the fault is cleared.
The more detailed three digit code numbers in the DTC
column of the following tables are only indicated on a JLG
handheld diagnostic analyzer.
To troubleshoot multiple DTCs, start with the DTC with the
higher first two digits.
If a correction is made during a
check, conclude the check by cycling the machine
power off then back on, using the emergency stop
switch.
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