Jaguar XJ (X350). Manual — part 21

knowledge of its storage location

Park Neutral

Position

PNP

Park Neutral

Position Switch

PNP Switch

Indicates the selected non-drive modes

of the (automatic) transmission

Part number

part no.

Pulse Width

Modulated

PWM

Programmable

Electronic Control

Units System

PECUS

Process whereby a common ECM is

programmed on the production line to

suit the market requirements of a

particular vehicle

Programmable

Read-only Memory

PROM

ROM with some provision for setting the

stored data after manufacture

Random Access

Memory

RAM

Fast access memory store which is

accessible for entry or extraction of data

Read-Only Memory

ROM

Fast access memory in which data is

fixed and may not be changed

Reservoir

RES

Container, usually for oils, coolants or

hydraulic fluids

Rest Of The World

ROW

Return

RTN

A dedicated sensor ground circuit

Revolutions Per

Minute

RPM

Shaft speed of a device, usually an

engine or motor

Right-hand

RH

Right-hand drive

RHD

Scan Tool

ST

Device that interfaces with and

communicates information on a data

link

Seat Control

Module

SCM

Module controlling the seat motor

systems (not electric raise/lower-only

seats)

Secondary Air

Air provided to the exhaust system

Secondary Air

AIR

System used for a period of time each

time the engine is started, unless

certain temperature criteria are met.

Pumps air directly into the exhaust

system which generates extra heat and

reduces the time taken for the catalytic

converters to reach operating

temperature

Secondary Air

Injection Bypass

AIR Bypass

Vents secondary air to atmosphere

Secondary Air

Injection Check

Valve

AIR Check Valve

Valve which prevents back-flow of

exhaust gas to the AIR system when

the system is inoperative

Secondary Air

Injection Diverter

AIR Diverter

Diverts secondary air to either the

catalyst or exhaust manifold

Secondary Air

Injection Magnetic

Clutch

AIR Clutch

Clutch mounted on the AIRP drive shaft

Secondary Air

Injection Pump

AIR Pump

Mechanically driven rotary vane pump,

driven through the AIRPC

Secondary Air

Injection Relay

AIR Relay

Controls the injection of air into the

exhaust system

Secondary Air

Injection Switching

Valve

AIR Switching

Valve

Vacuum operated valve backing-up the

AIRC

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Security & Locking

Control Module

SLCM

Module controlling the vehicle's security

and closure-locking functions

Sensor

S

Generic name for a device that senses

either the absolute value or a change in

a physical quantity such as

temperature, pressure or flow rate, and

converts that change into an electrical

quantity signal

Service Repair

Operation

(number)

SRO

Number generated by Jaguar Methods

& Techniques system which relates to

the time allowed to complete a repair

operation. Further information on the

system can be found in the separate

Jaguar Publications (for each model

range) entitled 'Repair Operation Times'

Shift Solenoid

SS

Controls shifting in an automatic

transmission

Signal return

SIG RTN

Sliding Roof

Control Module

SRCM

Society of

Automotive

Engineers

SAE

Speed Control

Control Module

SCCM

Module controlling Speed Control

System

Square centimeter

cm²

Standard

std

Standard

Corporate Protocol

SCP

A high-speed, serial communications

system linking all body system control

modules. Control messages and data

are passed between modules at up to

786 messages per second

Supercharger

SC

An intake system which utilizes a

supercharger (mechanically driven

device that pressurizes intake air,

thereby increasing density of charge air

and the consequent power output from

a given displacement)

Supercharger

Bypass

SCB

Tachometer

TACH

A circuit that provides input for an

electronic tachometer display

Thermal Vacuum

Valve

TVV

Controls vacuum levels or routing

based on temperature

Throttle Body

TB

Device containing the throttle

Throttle Position

TP

Throttle Position

Sensor

TP Sensor

Interprets throttle position and

movement to identify idle, acceleration

and full-power demands

Throttle Manifold

Absolute Pressure

Sensor

TMAP

Combines the inlet air temperature and

manifold pressure sensor in one

component

Top Dead Center

TDC

Torque Converter

Clutch

TCC

Transmission

Control Module

TCM

Controls the shifting pattern of the

(automatic) transmission

Transmission

Control Switch

TCS

Modifies the operation of electronically

controlled transmissions

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