JLG M600 Service Manual - Manual (Page 185)

SECTION 6 - JLG CONTROL SYSTEM
3121813 – JLG Lift – 6-19
5/5 Flash code 5/5 indicates problems with vehicle speed or the encoder.
NO VEHICLE MOVEMENT DETECTED AT MAXIMUM POWER
No speed was measured with traction motor full on. This could be due to a traction motor fault, a power wiring error, a speed encoder
fault, the brakes not releasing (although brake pressure is OK) or the vehicle being overloaded so that the motor cannot turn the wheels.
DRIVE PREVENTED - BOTH SPEED ENCODERS FAULTY
Both speed encoder input voltages are out of range.
LEFT SPEED ENCODER FAULTY
The speed encoder on the left wheel (connected to the positilt module) has a short-circuit or open-circuit fault; drive is still possible at
creep speed (automatic positrac is disabled).
RIGHT SPEED ENCODER FAULTY
The speed encoder on the right wheel (connected to the power module) has a short-circuit or open-circuit fault; drive is still possible at
creep speed (automatic positrac is disabled).
SPEED ENCODERS READING INVALID SPEED
One or both speed encoders is indicating an impossible number of pulses. This is probably due to a faulty speed encoder.
TILT MODULE FAILURE: NOT COMMUNICATING
No information is being received from the positilt module (it may be miswired); the system will drive at creep speed using the speed
encoder connected to the power module; the controller defaults to massively tilted and does not try to prevent vehicle roll on the grade.
VEHICLE RUNAWAY - CHECK SPEED ENCODERS
Speed in the wrong direction was measured with traction motor full on. This is probably due to the speed encoder being fitted incor-
rectly; it could also be due to a speed encoder fault or faults as for “NO VEHICLE MOVEMENT DETECTED” with the vehicle on a grade.
6/6 Flash code 6/6 indicates problems with the CANbus.
48V PROTECTION TRIPPED - CHECK INTER-MODULE WIRING
The power module is not receiving acknowledgements from the platform, ground modules, or positilt modules to transmitted data,
and the protection circuit which supplies the platform, ground, and positilt modules has tripped. This is probably due to wiring prob-
lems at the platform, ground, or positilt module.
CANbus FAILURE: GROUND MODULE
The power module is receiving from the platform module but not the ground module. This should not be possible!
CANbus FAILURE: PLATFORM MODULE
The power module is receiving from the ground module but not the platform module. This is probably due to wiring problems between
the platform and ground modules.
CANbus FAILURE: POWER MODULE
The power module is not receiving acknowledgments from the platform, ground, or positilt modules to transmitted data. This is prob-
ably due to wiring problems between the power and positilt modules.
GROUND MODULE FAILURE: OBSOLETE ON THIS VEHICLE
The ground module is an old design which is incompatible with the E600 vehicle; it must be replaced (it can be used on E300/M45/E45
vehicles).
Table 6-5. Help Descriptions and Fault Flash Codes