Jaguar XJ (X350). Manual — part 18

Center

TDC

Blower

BLR

Device which supplies a current of air at

moderate pressure, e.g. heater or A/C

blower

Body Processor

Module

BPM

Control module for body electrical

systems, e.g. interior lamps, windshield

wash / wipe control

Bottom Dead

Center

BDC

Lowest point of piston travel in a

reciprocating engine

Brake horsepower

BHP

Effective horsepower developed by an

engine or motor, as measured by a

brake applied to its output shaft

Brake Mean

Effective Pressure

BMEP

The part of the effective pressure

developed in a cylinder that would result

in a cylinder output equal to the bhp of

the engine

Brake On/Off

BOO

Indicates the position of the brake pedal

British Standard

BS

Standard specification issued by the

British Standards Institution

British Standard

Automotive

BSau

Bus

Topology of a

communication

network

Bypass Air

BPA

Mechanical control of throttle bypass air

Camshaft Position

Sensor

CMP Sensor

Indicates camshaft position

Canadian Motor

Vehicle Safety

CMVSS

Standard

Canister Purge

CANP

Controls purging of the EVAP canister

Carbon dioxide

CO2

Colorless gas with a density of

approximately 1.5 times that of air

Carbon monoxide

CO

Poisonous gas produced as the result

of incomplete combustion

Case Ground

CSE GND

Control module casing ground

Catalytic converter

In-line exhaust system device used to

reduce the level of engine exhaust

emissions

Celsius

C

SI term for the Centigrade scale, with

freezing point at zero and boiling point

at 100 degrees

Central Processor

Unit

CPU

The section of a computer that contains
the arithmetic, logic and control circuits.

It performs arithmetic operations,

controls instruction processing, and

provides timing signals and other

housekeeping operations

Cylinder Head

Temperature

Sensor

CHT Sensor

A sensor for measuring the temperature

of the cylinder head

Closed Loop

CL

Closed Loop

System

CL System

Control system with one or more

feedback loops

Column/Mirror

Control Module

C/MCM

A self-contained group of electrical

/electronic components, designed as a

single replaceable unit, and controlling

one or more processes

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Controller Area

Network

CAN

A communication system which allows

control modules to be linked together.

Crankshaft Position

Sensor

CKP Sensor

Generates crankshaft position

information in conjunction with the

CKPTR (also generates speed

information in certain applications)

Crankcase

Ventilation System

CV

System which scavenges camshaft

cover and crankcase emissions and

feeds them into the inlet manifold

Cubic centimeter

cm³

Curb weight

Weight of vehicle with fuel, lubricants

and coolant, but excluding driver,

passengers or payload

Data Link

Connector

DLC

Connector providing access and/or

control of the vehicle information,

operating conditions, and diagnostic

information

Data Output Line

DOL

Circuit that sends certain information

from the ECM to the instrument cluster

Degree

deg, °

Angle or temperature

Department of

Transportation

(US)

DOT

Which is a fibre optic ring network, can

be diagnosed through the SCP network,

and with the optical bus tester.

Deutsche Institut

fur Normung

DIN

German standards regulation body

Diagnostic Module

DM

Supplemental Restraint System (non -

controlling) module for diagnostics

overview

Diagnostic Test

Mode

DTM

A level of capability in an OBD system.

May include different functional states

to observe signals, a base level to read

DTCs, a monitor level which includes

information on signal levels, bi-

directional control with on/off board

aids, and the ability to interface with

remote diagnosis

Diagnostic Trouble

Code

DTC

An alpha/numeric identifier for a fault

condition identified by the On-Board

Diagnostic (OBD) system

Differential

pressure

Pressure difference between two

regions e.g. between intake manifold

and atmospheric pressures

Differential

Pressure Feedback

EGR

DPFE

An EGR system that monitors

differential EGR pressure across a

remote orifice to control EGR flow

Direct current

dc

Current which flows in one direction

only, though it may have appreciable

pulsations in its magnitude

Domestic Data Bus

D2B

Exhaust Gas

Recirculation

Temperature

Sensor

EGRT

Sensing EGR function based on

temperature change

Engine

Management

System

EMS

The engine management system

conditions and reads inputs, supplies

processing capability, and provides

output drivers to control actuators as

directed by software and calibration

Engine Oil

Pressure

EOP

EGR Vacuum

Regulator

EVR

Controls EGR flow by changing vacuum

to the EGR valve

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