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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