Bosch Intellic EFAS-4.11 - Page 72

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Workshop Manual
Smart Tachograph EFAS-4.10/4.11
SrvID
hex
EFT
hex
DTC Symbol
Display text
Description and trouble-shooting
S32 - - 40 00 000A70 - - - Meaning / Cause:
Communication on the CAN main vehicle bus (depending on
the parameter setting at the A or C connector) of EFAS has mal-
functioned or is not possible.
The following causes are possible:
y No bus subscriber is connected or a bus subscriber is not
supplied with voltage.
y The CAN fault management system has not been cong-
ured correctly. This means that the time period, which the
bus subscribers connected require for initialization after
switching on the ignition, has not been considered.
Measures:
y Check the feed cables to the Bus subscribers and the power
supply to the Bus subscribers.
y Test the malfunctions on the CAN bus using a suitable CAN
diagnostics device.
y Read out the CAN error counters using the EFAS Service Tool
(the error counters should read zero or should reset to zero).
y Check the sample point, i.e. the parameter value RDI=0xF97A
for data bits on the CAN bus. The parameter is normally set
for EOL programming to a value between 80% and 88%.
Check if the malfunction can be eliminated by changing the
parameter.
y Check the CAN error management (parameter value
RDI=0xF97C) and, if required, increase the value. The value
is usually specied by the vehicle manufacturer.
y See also the measures for the following error.
Remarks:
Depending on the conguration of the CAN fault management
system, the detection of these malfunctions is suppressed for
a maximum of 25 seconds (smaller values are common) after
switching on the ignition. This means that only malfunctions
that still persist after this time has elapsed or those that occur
thereafter are then reported immediately. Please wait for the
corresponding period of time in order to be sure that there is no
malfunction.
S33 - - 40 00 000B78 - - - Meaning / Cause:
The CAN main vehicle bus (depending on the parameter setting
at the A or C connector) is in the “Bus O” state, i.e. EFAS is no
longer participates in the CAN communication.
The following causes are possible:
y Missing terminal resistances at the bus end points or incor-
rect bus termination at the intermediate points.
y Incorrect baud rates of other subscribers or incorrectly
selected baud rate or protocol in the EFAS
y Cable short-circuits.
Measures:
y Check the feed cables to the Bus subscribers.
y Check whether the EFAS has a terminating resistor (device
option) and whether a terminal resistance is required at the
EFAS for the given type of vehicle.
y Check whether the bus is correctly terminated at the end
points of the bus with terminating resistors.
y Select the correct bit rate and protocol in EFAS with the EFAS
Service Tool.