fuse LAND ROVER DISCOVERY 1995 Workshop Manual

04GENERAL SPECIFICATION DATA
14
INFORMATION Coil
Make/type Bosch 0221 122 392........................................................................
Distributor
Make/type Lucas 35 DLM8........................................................................
Firing angles 0°-45°-90°(every 45°)±1° ....................................................................
Application 12V Negative ground.......................................................................
Pick-up air gap adjustment
(Pick-up limb/reluctor tooth) 0.20 mm to 0.35 mm.............................................
Pick-up winding resistance 2k to 5k ohms...............................................
Fuses
Type Autofuse (blade type).................................................................................
blow ratings to suit individual circuits
Horns
Make/type Klamix (Mixo) TR99........................................................................
Starter motor
Make and type Bosch 12v.................................................................

12ENGINE
4
REPAIR 39.Release battery positive lead terminal cover.
40.Remove terminal nut
41.Release terminal from battery.
42.Release fusebox main feed lead.
43.Position battery cable over engine.
44.Pivot jockey pulley downwards to release drive
belt tension.
45.Release belt from pulleys.
46.Remove drive belt.
47.Disconnect compressor multiplug
48.Remove 4 bolts securing compressor.
49.Remove heatshield.
50.Release compressor from bracket and tie aside.
51.Slacken clip securing PAS hose to pump.
52.Disconnect hose.
53.Plug hose and pump.
54.Disconnect PAS hose connection at pump and
steering box.
55.Release unions and remove hose.
56.Remove and discard 'O' rings.
57.Plug pump and steering box.
58.Remove LH and RH engine mounting nuts.
59.Position lifting chains and attach hooks to engine
lifting eyes.
60.Raise engine sufficiently to release engine
mountings.
61.Release engine mountings and remove.
62.Lower engine until it just rests on engine
mounting brackets.
63.Disconnect chains.
64.Raise ramp.
65.Remove catalytic converter/front pipe assembly.
See EMISSION CONTROL, Repair, Catalytic
Converter/Front Pipe - 4.0 V8
66.Remove 9 bolts securing bell housing bottom
cover. Note position of 2 dowel bolts.
67.Remove cover.
68.Remove locknut securing transfer box tie bar.
69.Remove 2 bolts securing tie bar to tranmission.
70.Remove tie bar.
71.Remove 2 and slacken 1 bolt, securing bell
housing access plate and position aside.
72.Mark drive plate to torque converter relationship.
73.With assistance, rotate crankshaft for access to
first bolt (torque converter to drive plate).
74.Remove first bolt.
75.Repeat steps for the remaining 3 bolts.
76.Remove 2 bolts securing crankshaft sensor
shield to engine backplate.
See FUEL SYSTEM
SFI, Repair, Crankshaft Position Sensor
(CKP Sensor)

MFI
1
FAULT DIAGNOSIS ENGINE TUNING
Circuit fault diagnosis may be carried out on all V8i
vehicles, using Testbook. Testbook will guide the
operator by visual prompts through a series of
diagnostic checks.
Before commencing any fault diagnosis, the following
preminary checks must be carried out.
Preliminary checks
CAUTION: Catalyst exhaust: If engine is
misfiring or fails to start within 12 seconds
the cause must be rectified. Failure to do
so will result in irreparable damage to the
catalysts. After rectification the engine must be
run at 1500 rev/min (no load) for 3 minutes to
purge any accumulation of fuel in the system.
1.Check that the inertia fuel shut off switch is not
tripped.
2.Check fuse in main fuse panel.
3.Check for ample fuel in tank.
4.Check air inlet system for possible leaks into the
intake manifold.
5.Check HT cables for correct firing order and
routing.
6.Check ignition timing.
Only when the above checks have been carried out,
should circuit diagnosis begin.
See Electrical
Trouble Shooting Manual.
INJECTOR TESTS
NOTE: Before removing any of the
injectors, remove and examine the spark
plugs, check for consistent colouration of
plugs. A leaking injector will result in the
appropriate spark plug being 'sooted up'.
The following test may only be carried out using
suitable injector test equipment.
Leak Test
Leak test with the injectors closed but pressurise to
2.54 Kgf/cm
2. No injector should leak more than 2
drops of fuel per minute.
Fuel Delivery Test
Fuel delivery test with the injector open and
pressurised as above, fuel delivery from each injector
should be 160-175cc per minute using white spirit, or
180-195cc per minute using petrol at 20°C±2°C.

19FUEL SYSTEM
6
DESCRIPTION AND OPERATION REV: 09/95 Idle air control (IAC)
Idle speed is controlled by a stepper motor which
consists of two coils. When energised in the correct
sequence the coils move a plunger which opens and
closes the throttle bypass controlling the quantity of
idle air. The stepper motor controls idle speed by
moving the plunger a set distance called a step. Fully
open is zero steps and fully closed 180 steps. Failure
of the stepper motor will result in low or high idle
speed, poor idle, engine stall or non start. The fault is
indicated by illumination of the malfunction indicator
light (MIL) on North American specification vehicles.Heated oxygen sensor (HO2S)
The oxygen sensors consist of a titanium metal
sensor surrounded by a gas permeable ceramic
coating. Oxygen in the exhaust gas diffuses through
the ceramic coating on the sensor, and reacts with the
titanium wire altering the resistance of the wire. From
this resistance change the ECM calculates the
amount of oxygen in the exhaust gas. The injected
fuel quantity is then adjusted to achieve the correct
air/fuel ratio, thus reducing the emissions of carbon
monoxide (CO), hydrocarbons (HC),and oxides of
nitrogen (NO
2). Two HO2 sensors are fitted, one in
each exhaust downpipe just ahead of the catalyst.
Note that if the wiring to these sensors is crossed, the
vehicle will start and idle correctly until the sensors
reach operating temperature. Then the ECM will read
the signals from them and send one bank of cylinders
very rich and the other very weak. The engine will
misfire, have a rough idle and emit black smoke, with
possible catalyst damage.
In the event of sensor failure, the system will default to
'open loop'. Operation and fuelling will be calculated
using signals from the remaining ECM inputs.
The fault is indicated by illumination of the malfunction
indicator light (MIL). ECM diagnostics also uses HO2
sensors to detect catalyst damage, misfire and fuel
system faults.
North American vehicles have two extra HO2 sensors
mounted one after each catalyst. These are used to
determine whether the catalysts are operating
efficently.
CAUTION: Although robust within the
vehicle environment, HO2 sensors are
easily damaged by dropping, excessive
heat and contamination. Care must be exercised
when working on the exhaust system not to
damage the sensor housing or tip.

33CLUTCH
2
REPAIR BLEED HYDRAULIC SYSTEM
Service repair no - 33.15.01
Procedure
NOTE: During bleed procedure, keep fluid
reservoir topped up to avoid introducing
air to system. For hydraulic fluid
recommendations.
See LUBRICANTS, FLUIDS
AND CAPACITIES, Information, Recommended
Lubricants and Fluids
1.Attach suitable tubing to slave cylinder bleed
screw.
2.Place free end of tube in a glass jar containing
clutch fluid.
3.Loosen bleed screw.
4.Pump clutch pedal, pausing at end of each
stroke, until fluid from tubing is free of air.
Keeping free end of tube below surface of fluid.
5.Hold clutch pedal down, tighten bleed screw.
6.Top up fluid reservoir.MASTER CYLINDER
Service repair no - 33.20.01/03
NOTE: All flexible and pipe connections
and joints should be tightened to
15 Nm.
Remove
1.Evacuate hydraulic fluid from system.
2.Disconnect fluid pipe at master cylinder. Plug
master cylinder fluid port and seal end of
hydraulic pipe to prevent ingress of foreign
matter.
3.Lower fascia fuse box panel.
4.Remove master cylinder fixings.
5.Remove retaining washer and clevis pin from
push rod and clutch pedal.
6.Remove master cylinder.

CLUTCH
3
REPAIR Refit
7.Fit the master cylinder and fixings.
8.Fit push-rod to pedal and retain with clevis pin
and washer.
9.Raise fasica fuse box panel.
10.Fit fluid pipe to master cylinder.
11.Bleed system.
See Bleed Hydraulic System
RELEASE BEARING ASSEMBLY
Service repair no - 33.10.07
Remove
1.Remove gearbox.
See MANUAL GEARBOX,
Repair, R380 Manual Gearbox
2.Remove clutch slave cylinder.See Slave
Cylinder
3.Withdraw retainer staple.
4.Withdraw bearing and sleeve. If required, press
bearing off sleeve. Fit replacement bearing with
domed face outwards from sleeve.
5.Remove spring clip and fixings.
6.Withdraw release lever assembly.
Refit
7.Smear pivot with grease and fit release lever and
retain with spring clip and bolt.
8.Smear release bearing sleeve inner diameter
with molybdenum disulphide base grease.
9.Reverse removal procedure. 1 to 4.

57STEERING
12
REPAIR UPPER STEERING COLUMN
Service repair no - 57.40.01
NOTE: Steering column assembly is not a
serviceable component.
CAUTION: Before removing any parts of
steering linkage, it is imperative that road
wheels are positioned straight ahead. then
steering wheel removed to prevent rotary coupler
being wound up or damaged.
CAUTION: After refitting steering linkage
parts follow correct procedure to ensure
that road wheels, steering box and
steering wheel are correctly positioned relative to
each other when in straight ahead condition. if
steering wheel requires repositioning, ensure that
drive pegs on rotary coupler are correctly
positioned before steering wheel is replaced.
This ensures drive pegs locate in their holes in
rear of steering wheel.
After final alignment, connect rotary coupler
multiplug, tighten steering wheel securing nut and
fit airbag - if fitted or steering wheel trim pad and
horn push assembly.
Remove
1.Remove steering wheel.
See Steering Wheel
CAUTION: Prevent rotation of rotary
coupler once steering wheel is removed.
Secure in position with adhesive tape.
2.Remove driver's access panel.
3.Remove steering column shroud.
See Steering
Column Shroud
4.Remove rotary coupler.See
SUPPLEMENTARY RESTRAINT SYSTEM,
Repair, Rotary Coupler
5.If fitted - remove 4 screws securing knee bolster,
remove knee bolster.
6.Disconnect column switch multiplug.
7.Disconnect ignition switch multiplug from fuse
box.

STEERING
15
REPAIR STEERING COLUMN LOCK ASSEMBLY
Service repair no - 57.40.31
Remove
CAUTION: Before removing any parts of
steering linkage, it is imperative that road
wheels are positioned straight ahead.
Then steering wheel removed to prevent rotary
coupler being wound up or damaged.
CAUTION: After refitting steering linkage
parts follow correct procedure to ensure
that road wheels, steering box and
steering wheel are correctly positioned relative to
each other when in straight ahead condition. If
steering wheel requires repositioning, ensure that
drive pegs on rotary coupler are correctly
positioned before steering wheel is replaced.
This ensures drive pegs locate in their holes in
rear of steering wheel.
After final alignment connect rotary coupler
multiplug, tighten steering wheel securing nut and
fit airbag module - if fitted.
1.Disconnect battery negative lead.
2.Remove steering column shroud.
See Steering
Column Shroud
3.Release turnbuckles, lower driver's access
panel.
4.If fitted, remove 4 screws securing knee pad,
remove bolster.
5.Disconnect ignition switch multiplug from fuse
box.
6.Disconnect ignition switch main feed multiplug.

BRAKES
3
DESCRIPTION AND OPERATION Description of components
1. ABS Modulator unit
To provide the ABS function a Modulator is positioned
within the system between the master cylinder and the
calipers. On both LHD and RHD vehicles it is sited on
the left inner wing [fender]. The Modulator has 8
solenoid valves, 2 for each wheel, 2 expanders and a
recirculation pump. It is non serviceable.
2. Servo/master cylinder
Actuation of the system is provided by a combined
master cylinder and servo assembly attached to the
pedal box, this provides pressure to opposed piston
calipers at each brake pad Twin piston at the front
axle, single piston at the rear.
3. Pressure reducing valve
To maintain the braking balance, pressure to the rear
axle is regulated by a Pressure Reducing Valve (PRV)
This PRV is of the failure bypass type, allowing full
system pressure to the rear axle in the event of a front
circuit failure. It is sited on the left inner wing [fender].
4. Electronic control unit - ECU
ABS control is provided by an electronic control unit
which is positioned on the passenger side of the
vehicle behind the dash panel/glove box.
The ECU, which is non-serviceable, is connected to
the ABS harness by a 35 way connector. non
serviceable.
The ECU continually monitors the brake system,
providing diagnostics in the event of a system
malfunction. Details of how to access the ECU
diagnostics are provided in the Electrical
Troubleshooting Manual.
5.& 6. Front and rear sensors/exciter rings - 4 off
A sensor is sited at each wheel, sensing a 60 tooth
exciter ring. When vehicle is in motion inductive
sensors send signals to ECU. Front exciter ring is
fitted to outside diameter of constant velocity joint
inside each front hub assembly. The rear exciter ring
is bolted to the rear of each brake disc bell.7. Diagnostic plug connection
A diagnostic plug is located behind the dash. To the
left of the steering column on LHD vehicles. To the
right of the steering column on RHD vehicles. It is a 5
way blue connector.
The location and identification of ABS electrical relays
are given in the Electrical Troubleshooting Manual.
For location and identification of ABS electrical fuses.
See ELECTRICAL, Repair, Fuse Box - Interioror.
See ELECTRICAL, Repair, Fuse Box - Engine
Compartment
ANTI-LOCK BRAKE SYSTEM - ABS
Manufactured by WABCO
Introduction
The purpose of ABS is to prevent vehicle wheels
locking during brake application, thus maintaining
vehicle steerability and stability. This allows vehicle to
be steered whilst brakes are applied, even under
emergency conditions, and to avoid obstacles where
there is sufficient space to redirect the vehicle.
WARNING: ABS is an aid to retaining
steering control and stability while
braking.
·ABS cannot defy the natural laws of physics
acting on the vehicle.
·ABS will not prevent accidents resulting from
excessive cornering speeds, following
another vehicle too closely or aquaplaning,
i.e. where a layer of water prevents adequate
contact between tyre and road surface.
·The additional control provided by ABS must
never be exploited in a dangerous or
reckless manner which could jeopardise the
safety of driver or other road users.
·The fitting of ABS does not imply that the
vehicle will always stop in a shorter stopping
distance.

70BRAKES
4
DESCRIPTION AND OPERATION System description
The brake system consists of dual hydraulic circuits in
a front - rear split. That is individual circuits to front
and rear axles.
Wheelspeed signals are provided by the fitting of
exciter rings to axles and speed sensors.
An ABS stop light switch is fitted to provide a braking
signal to the ECU as well as operate the stop lights.
Electrical wiring is provided as necessary with system
relays and fuses. Discovery Electrical Troubleshooting
Manual gives the location and wiring circuits of these
components.
Visual warning of system malfunction is provided via a
warning light in the instrument panel.
Hydraulic circuit ABS
Key
A = Primary hydraulic circuit
B = Secondary hydraulic circuit
C = Pressure reducing valve
D = ABS ModulatorABS System operation
During normal braking the feel of the brake pedal on
vehicles equipped with ABS will be the same as that
on non ABS vehicles. During ABS cycling the driver
will experience feedback in the form of a pulsating
brake pedal and solenoid/pump motor noise from the
Modulator.
The system is fully automatic in operation both on and
off road, and will only act when the ECU detects that
ABS cycling is necessary. The ECU continually
monitors the operation of the system.
When starting the ABS system will go through a series
of self checks, including a check of the solenoid
valves/pump motor.
WARNING LIGHT
The warning light will be on during the self check
(1.3-2 secs). If no faults are stored in the memory the
light goes out for 0.5sec,then comes on again. It will
then remain on until the vehicle is driven faster than 7
kph/5mph. This is the only time that the light will be on
without indicating a problem.
Any faults detected by the ECU will cause the warning
light to illuminate indicating that the vehicle may not
have full ABS control.