Discovery II (LT) V8-4.6L (2003)
SOHC
Single Overhead Camshaft
SPE
Single Point Entry
sp.gr
Specific gravity
SRS
Supplementary Restraint System
std.
Standard
synchro
Synchronizer or synchromesh
TA
Traffic Announcement
TDC
Top Dead Centre
TMAP
Temperature Manifold Absolute Pressure
TMC
Traffic Management Channel
TP
Throttle Position
TPS
Throttle Position Sensor
TV
Torsional Vibration
TWC
Three-way Catalyst
TXV
Thermostatic Expansion Valve
UK
United Kingdom
US
United States
US galls/h
US gallons per hour
V
Volt
Var.
Variable
VDOP
Velocity Dilation Of Precision
VICS
Vehicle Information Communications System
VIN
Vehicle Identification Number
VIS
Variable Intake System
VRS
Variable Reluctance Sensor
VSS
Vehicle Speed Signal
W
Watt
WOT
Wide Open Throttle
General
General
This is intended to assist in diagnosing electrical faults, and should be used in conjunction wish the Electrical Circuit Diagrams The document is divided
into the following sections:
1. INTRODUCTION - includes Electrical Precautions, a list of Abbreviations and general information on how to use the document.
2. FUSE DETAILS - provides details of location, rating in Amperes and circuit(s) protected.
3. EARTH POINTS AND HEADERS - provides details of earth points, earth and power headers including a plan view of the vehicle to aid
location.
4. DESCRIPTION AND OPERATION - provides an explanation of how each of the systems operates.
5. CONNECTOR DETAILS - details of connectors including a location photograph, face view and pin-out table.
NOTE: Before starting electrical checks on the vehicle ensure that the relevant mechanical functions operate satisfactory.
References
References to the LH or RH side given in this document are made when viewing the vehicle from the rear.
Operations covered in this document do not include reference to testing the vehicle after repair. It is essential that work is inspected and tested after
completion and if necessary a road test of the vehicle undertaken particularly where safety related items are concerned.
CAUTION: Before undertaking any electrical work on a vehicle ALWAYS read the ELECTRICAL PRECAUTIONS.
Battery voltage
Before commencing diagnosis of electrical problems, verify the condition of the battery is acceptable by using the open circuit voltage test.
Open circuit voltage test
1. Switch off all electrical loads on the vehicle
2. Adjust digital multimeter to read dc volts on the appropriate scale.
3. Connect test probes across battery terminals ensuring that polarity is correct and record the voltage displayed.
A reading of 12.3 V or more is acceptable; any battery which reads less than this will need charging.
NOTE: If the vehicle has been used within a period of a hours prior to the test surface charge must be removed from the battery by switching the