Page - 66/79 AF6ZP0AL - COMBIAC0 & ACE0 - User Manual
low value, the problem is inside the controller and the Smart Driver is
probably damaged.
23) “KEYOFF SHORTED”
Cause:
This fault is displayed when the controller detects a low logic level of Key-Off
signal during Start-Up diagnosis.
Troubleshooting:
It is very likely the fault is due to an under voltage, so it is suggested to
check:
A) Key input signal down-going pulses (below under voltage threshold) due
to external loads, like DC/DC converters starting-up, relays or contactor
switching, solenoids energizing / de-energizing.
B) Check the connection of power cables to the battery terminal, positive
and negative, to MC and to controller +Batt and –Batt, which must be
screwed with a torque comprised in the range 5,6Nm÷8,4Nm.
C) If no voltage transient is detected on the supply line and the alarm is
present every time the key is switched ON, the failure is probably in the
controller hardware, so it is necessary to replace the logic board.
24) “EVP1 NOT OK”
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.
25) “EVP2 NOT OK”
Cause:
A) The EVP2 driver is shorted.
B) The microcontroller detects a mismatch between the valve set-point and
the diver voltage measured on the EVP2 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.
26) “PUMP VMN LOW”
Cause:
The pump motor output is lower than expected, considering the pwm applied.
Troubleshooting:
A) If the problem occurs at start up (the LC does not close at all), check:
- Motor internal connections (ohmic continuity)
- Motor power cables connections
- If the motor connection are OK, the problem is inside the controller
B) If the problem occurs after closing the LC (the LC closed and then opens
back again), check:
- Motor connections
- If motor windings/cables have leakages towards truck frame
- If no problem are found on the motors, the problem is inside the
controller
C) If the alarm occurs during motor running, check:
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