Advertisement
Code
Alarm
74
DRIVER
SHORTED
75
CONTACTOR
DRIVER
78
VACC NOT OK
Traction
Pump
EPS
(T)
(P)
(E)
Cause :
The driver of the main contactor coil is shorted.
Troubleshooting :
A)
Check if there is a short or a low impedance pull-down
between NMC (CNA#16) and -BATT.
B)
The driver circuit is damaged in the logic board, which
has to be replaced.
Cause :
The LC coil driver is not able to drive the load.
The device itself or its driving circuit is damaged.
Troubleshooting :
This type of fault is not related to external components;
replace the controller.
Cause:
The MC coil driver is not able to drive the load.
The device itself or its driving circuit is damaged.
Troubleshooting:
This type of fault is not related to external components;
replace the ACE2 logic board.
Cause :
The test is made at key-on and after 20sec that both the
travel demands have been turned off. This alarm occurs
if the ACCELERATOR reading in the TESTER menu' is
1.0V higher than PROGRAM VACC min acquisition
when the accelerator is released.
Troubleshooting :
Check the mechanical calibration and the functionality of
the potentiometer.
Cause :
The test is made at key-on and immediately after that
both the travel demands have been turned off. This
alarm occurs if the ACCELERATOR reading in the
TESTER menu' is 1.0V higher than PROGRAM VACC
min acquisition when the accelerator is released.
Troubleshooting :
Acquire the maximum and minimum potentiometer value
through the PROGRAM VACC function. If the alarm is
still present, check the mechanical calibration and the
functionality of the potentiometer. If the alarm is not
disappeared the failure is in the ACE logic board, replace
it.
7-77
Description
Advertisement
