Jaguar XJ (X350). Service 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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