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Code
Alarm
240
EVP1 NOT OK
HARDWARE
FAULT 20
FAULT 21
FAULT A1
241
LIFT+LOWER
FLASH
CHECKSUM
Pump
EPS
Traction
(P)
(E)
(T)
Description
Cause :
A)
The EVP driver is shorted.
B)
The microcontroller detects a mismatch between the
valve set-point and the diver voltage measured on the
LOWER EVP1 output.
Troubleshooting :
Check if there is a short or a low impedance between the
negative of the coil and -BATT. Otherwise the driver
circuit is damaged and the controller must be replaced.
Cause :
Before driving the MC coil, the controller checks if the
Mosfets drivers are turned of by a not active (alarm
status) Watch-dog signal. If they are not turned of then
the alarm is generated.
Before driving the MC coil, the controller checks if the
EB/AUX drivers are turned of by a not active (alarm
status) Watch-dog signal. If they are not turned of then
the alarm is generated.
Before driving the MC coil, the controller checks if the
MC/AUX drivers are turned of by a not active (alarm
status) Watch-dog signal. If they are not turned of then
the alarm is generated.
Troubleshooting :
The problem is inside the controller, no external
component are involved, replace the logic board.
Cause :
This alarm occurs when both forks movement requests
(Lift + Lower) are active at the same time.
Troubleshooting :
Check the wiring of the Lift and lower inputs (use the
readings in the TESTER to facilitate the troubleshooting).
Check the microswitches for failures.
A failure in the logic is possible too. So, when you have
verified the travel demand switches are fine working and
the wiring is right, it is necessary to replace the controller.
Cause :
After key-on the software verifies the integrity of program
stored in the flash memory, if the verify has a negative
result this alarm is generated.
Troubleshooting :
The problem is in the microcontroller flash memory,
which could be damaged, or in the program stored
inside, which could be corrupted. Try to program the
logic again, if the alarms is still signalled the problem is in
the microcontroller. Replace the ACE logic board.
7-95
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