AFMNA0AA – EPS-BLI HYG – User Manual
Page – 55/75
21) TFD WRONG RESIST
Warning with E-steering motor controller off 0xFFD8 = 216
Group #4 [M,S]:
MAIN CONTACTOR other than OPTION #1 as to keep the
motor controller on.
- Cause:
Parameter TFD OHM IMPED. sets the expected resistance of the
TFD coil @ 25°C. This parameter is used for a coarse check of the
integrity of the TFD coil. E-steering motor controller measures the
TFD coil resistance with an electric test (Vcoil / Icoil). When the
measured resistance is outside the range from 1/3 to 3 times TFD
OHM IMPED 180 ms long, MuC raises this alarm.
Vcoil is evaluated using VCNA#9 –VCNA#10, if Vcoil results lower
than 2.3 V, diagnosis is not done due to a too low precision in the
regulation of Vcoil.
- Remedy:
The problem can be the resistance of the TFD coil is too high (coil
broken), or too low (a short circuit inside the TFD), or the wires to
the TFD are broken, or the parameter TFD OHM IMPED. has been
set wrong, or a problem in the controller.
22) TFD CURRENT MISM
Warning with E-steering motor controller off 0xFFC7 = 199
Group #3 [S]:
MAIN CONTACTOR other than OPTION #1 as to keep the
motor controller on.
- Cause:
There are two distinct circuits (two distinct shunts and two distinct
current amplifiers) for MuC and SuC for measuring the current in
the TFD coil. SuC compares its own current measurement with the
one from the MuC. In case they are unmatched more than 200 mA
130 ms long, SuC raises this alarm.
- Remedy:
It reports a problem inside the controller.
23) CAN BUS KO
Alarm 0xFFF7 = 247 Group #3 [M,S]:
- Cause:
If a node does not receive its dedicated CAN bus message
(different CAN IDs for MuC and SuC according to table 10.1.1)
longer than 100 ms, this alarm occurs.
- Remedy:
The problem can be in the CAN bus wires, or in the CAN bus
transceiver inside VCM, E-steering motor controller or another unit
in the truck. Identification of the root of the problem needs a CAN
bus analyzer.
24) CAN BUS KO M/S
Alarm 0xFFD7 = 215 Group #0 [M,S]:
- Cause:
MuC and SuC communicate via a local (embedded) CAN bus
communication system. If a node does not receive any response
from the other one longer than 100 ms, this alarm occurs.
- Remedy:
If it is repetitive, it is a problem in the steering controller.
25) WATCHDOG
Alarm 0xFF08 = 8 Group #0 [M,S]:
- Cause:
MuC and SuC communicate via a local CAN bus communication
