Volvo D13 Engine; System Overview - PREVOST H3-41 Maintenance Manual

SECTION 01 : ENGINE

2. VOLVO D13 ENGINE

2.1 SYSTEM OVERVIEW

NOTE
The "Premium Tech Tool" (PTT) is the preferred tool for performing diagnostic work. Contact your local
dealer for more information.
The Engine Management System (EMS) controls many engine functions such as: fuel timing and delivery,
engine protection functions, engine brake operation, EGR valve function and the turbocharger nozzle
function. The Engine Electronic Control Unit (EECU) along with other supporting control units and sensors
are responsible for monitoring and controlling these functions. These control units communicate through
the J1939 high speed serial data line to share data.
In addition to their control functions, the modules have on-board diagnostic capabilities. The on-board
diagnostics are designed to detect faults or abnormal conditions that are not within their operating
parameters. When the system detects a fault or abnormal condition, the fault will be logged in one or both
of the modules' memory. The vehicle operator will be advised that a fault has occurred by the illumination
of a malfunction indicator lamp and a message in the driver information display, if equipped. The module
may initiate the engine shutdown procedure if the system determines that the abnormal condition could
damage the engine. In some situations, the system will enter the "limp home" mode. Limp home mode
allows continued vehicle operation but, the system may substitute a sensor or signal value that may result
in reduced engine performance.
Fault codes logged in the system memory, can later be read to aid in diagnosing the fault. These faults
can be read via a diagnostic computer or through the instrument cluster display, if equipped. The
"Premium Tech Tool" (PTT) is the preferred tool for performing diagnostic work. Using a diagnostic
computer (or PTT) connected to the Serial Communication Port, expands the technician's diagnostic
capabilities with additional data and tests.
For diagnostic software, contact your local dealer.
NOTE
For maintenance or repair information of engine components or engine-related components, please
refer to Volvo Trucks USA Web Site under: Parts & Services, Online Manuals.
http://www.volvotrucks.us/parts-and-services/service/online-manuals/
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PA1621 Maintenance Manual All Series | Section 01 revised Feb 2019