JLG 800A_AJ ANSI Service Manual User Manual
Page 384
SECTION 6 - JLG CONTROL SYSTEM (S/N 0300065534 TO PRESENT)
6-54
– JLG Lift –
3120740
COOLANT TEMPERATURE SHORT
TO GROUND
If a Deutz engine is installed, this indicates that the coolant temperature is reading below
0.1 volts.
FORD FAULT CODE ##
All Ford fault codes except 63 are simply passed through from the FORD ECM. They only
occur if a Ford engine is selected in the machine configuration digits. Can be reported
during power-up sequence.
FORD FAULT CODE UNKNOWN
An unrecognized Ford ECM fault code has been received. Can be reported during power-
up sequence.
485 COMMUNICATIONS LOST
This fault only occurs with a Ford engine. It occurs when no responses are received from
the ECM for 2.5 seconds. Can be reported during power-up sequence.
FUEL SENSOR SHORT TO BATTERY Indicates that the fuel sensor is reading above 4.3 volts.
FUEL SENSOR SHORT TO GROUND Indicates that the fuel sensor is reading below 0.2 volts.
4/4
Flash code 4/4 indicates problems with the battery supply. Not reported during 2 second power-up.
7
BATTERY LOW
Battery voltage is below 11V for more than 5 seconds. This fault is not detected during
crank. This is a warning – the controller does not shut down.
BATTERY TOO HIGH – SYSTEM
SHUT DOWN
Battery voltage is above 16V. EMS recycle required.
BATTERY TOO LOW – SYSTEM
SHUT DOWN
Battery voltage is below 9V.
5/5
Flash code 5/5 indicates problems with vehicle engine RPM or the encoder. Not reported during 2 second power-up.
8
SPEED SENSOR READING INVALID
SPEED
This fault is detected with diesel engines only. The RPM pickup is indicating a speed that
greater than 4000 RPM or approximately 8875 Hz.
SPEED INPUT LOST
This fault is detected with diesel engines only. It occurs if there is no RPM detected and
the oil pressure input is reading above 8 PSI for more than three seconds. This is proba-
bly due to wiring problems at the ground module or a faulty speed sensor.
6/6
Flash code 6/6 indicates problems with the CAN bus.
10
CAN BUS FAILURE:
The ground module or platform module is not receiving CAN messages. This is probably
due to wiring problems between the platform and ground modules.
UMS SENSOR COMMUNICATIONS
LOST
The Ground module is not receiving CANbus information from the UMS module.
10
7/7
Flash code 7/7 indicates problems with a motor.
NOT REQUIRED
8/1
Flash code 8/1 indicates UMS sensor issues.
11
UMS SENSOR OUT OF USABLE
RANGE
Both the Chassis tilt sensor and the UMS sensor read greater then 10
UMS SENSOR NOT CALIBRATED
The Ground module detects that the UMS angle sensor has not been calibrated
UMS SENSOR FAULTED
The Ground module detects the UMS sensor is reading a frequency outside the 100Hz
+/- 5Hz range or the duty cycle is outside 50% +/- 21% range
Table 6-8. Help Fault Codes, Displayed Faults, and Descriptions - S/N 0300066931 to Present
Fault Flash
Code
Communicated (Displayed on
Analyzer) Fault
Description
Priority