System Overview
Power is supplied by the vehicle power distribution
modules (PDMs) to electronic control units (ECUs).
The ECUs coordinate power to outputs such as
lighting, displays, gauges, and indicators and control
power distribution by monitoring inputs such as
sensors and switches. The ECUs also continuously
monitor the status of all input devices and transmit
messages over multiple control area networks
(CANs), reducing the number of sensors required for
operation.
The Instrumentation Control Unit
(ICU) and Fault Codes
The majority of electrical and electronic issues on the
vehicle have an associated fault code, which will be
displayed on the ICU. If the ICU receives active fault
codes during the ICU self-check, it displays them one
after the other until the parking brake is released or
the ignition is turned off. Once the parking brake is
completely released, the ICU displays alerts until
acknowledged. See
Fig. 8.1. If there are no active
faults, the ICU displays the home screen after the
self-check completes.
NOTE: Some non-critical faults may be
suppressed and will not appear during an
instrumentation control unit (ICU) self-check.
When there is an active vehicle fault code, a popup
appears on the ICU message screen.
To access fault codes in the ICU:
1.
Use the buttons on the left-hand steering wheel
to navigate to the wrench icon and press OK.
See
8.2
2.
ECUs with active faults have an exclamation
point next to them. Use the down arrow to select
the affected ECU from the list, then press OK.
Refer to the ECU acronyms list for the full names
of acronyms on the ICU screen. See
Table 8.1.
3.
Locate the code to troubleshoot from the list of
active fault codes, then press OK to access the
information screen. See
Fig. 8.3.
4.
Press OK again to access additional information.
See
Fig. 8.4.
To troubleshoot and resolve fault codes, take the
vehicle to an authorized Freightliner service center
for diagnostics.
f61143808/25/2016
Fig. 8.1, ICUC Active Faults Alert Screen
f61143908/25/2016
Fig. 8.2, Electronic Control Unit (ECU) List in the ICUC
Electrical System
8.1
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