Service manual

Group 170 Preventive Maintenance
20
Check for Fault Codes in the Vehicle Elec-
tronic Control Unit
The instruments and engine control units, are always
included in the system. Other included control units de-
pend on the vehicle variant, legal requirements, and the
vehicle specifications.
The control units are:
•
Driver information display
•
Instrument Cluster
•
Vehicle Control Unit
•
Engine Control Unit
•
ABS Control Unit
•
EBS Control Unit
•
Air Suspension Control Unit
•
Retarder Control Unit
•
Load Indicator Control Unit
•
SRS (Airbag) Control Unit
•
Anti-Theft Control Unit
Ensure the engine is switched off during the service
check and the starter key is in the drive position (I).
The control lever on the right-hand side of the wheel is
used to communicate and display any fault codes on the
instrument’s driver information display.
1 Read any fault codes by using the control lever and
display. These fault codes are saved in the vehicle’s
control units.
2 Write down any fault codes displayed and then cor-
rect the faults.
3 After correction, clear the fault codes.
Note: Fault codes can also be traced using a diagnostic
program run through a PC.
Note: Refer to pertinent VCADS Pro Tool documentation.
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