Volvo TSI, Manual

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Group 28 General
Engine Control System Glossary
ATA
American Trucking Association
ATDC (After Top Dead Center)
The 180 of crankshaft rotation after the piston reaches
top center (normal direction of rotation).
AC (Alternating Current)
An electrical current that alternates level and direction.
BTDC (Before Top Dead Center)
The 180 of crankshaft rotation before the piston reaches
top center (normal direction of rotation).
INFO lamp
Light that warns the operator of an active diagnostic fault
code; also referred to as the diagnostic lamp.
Data link
An electrical connection for communication with other
microprocessor-based devices (such as powertrain con-
trol, trip recorders and maintenance systems) that are
compatible with the ATA and SAE standard.
Diagnostic fault code
These codes indicate an electronic system malfunction,
indicating a problem with the D12 electrical systems.
Diagnostic flash code
Codes flashed out in a series via the INFO lamp to indi-
cate an active fault code.
DC (Direct Current)
An electrical current that flows in one direction only.
EEPROM (Electrical Erasable Programmable Read
Only Memory)
The contents of this type of memory may be electroni-
cally erased and new information programmed into the
device.
EECU (Engine Electronic Control Unit)
The computer that controls the power supplied to the en-
gine electronics, monitors and governs engine functions.
EUI (Electronic Unit Injector)
An injector pump which is mechanically activated and
electronically controlled. It combines metering and inject-
ing in a single unit.
Engine brake disable system
During the time ABS (anti-lock braking system) is active,
the engine brake is disabled.
FMI (Failure Mode Identifier)
Numbers and names used to identify how a system or
part failed.
FMI Description
0 Data valid but above normal operating range
1
Data valid but below normal operating range
2
Data erratic, intermittent, or incorrect
3
Voltage above normal
4
Voltage below normal
5
Current below normal or open circuit
6
Current above normal or short circuit
7
Mechanical system not responding properly
8
Abnormal frequency, pulse rate or period
9
Abnormal update
10
Abnormal rate of change
11
Failure mode not identifiable
12 Defective device or component
13
Uncalibrated device or component
14/15
Reserved for future assignment
Hz (Hertz)
Measure of frequency in cycles per second.
MID
Message Identification Description
Open circuit
Condition where an electrical wire or connector is bro-
ken, preventing signal or supply voltage from reaching its
intended destination.
Parameter
A programmable value that affects the characteristics or
behavior of the engine and/or vehicle.
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