1999 LAND ROVER DISCOVERY engine

ENGINE MANAGEMENT SYSTEM - V8
DESCRIPTION AND OPERATION 18-2-75
Accelerating while cruise control is active
There are three ways of increasing vehicle speed when cruise control is active:
lTemporarily increase vehicle speed (e.g. when overtaking another vehicle).
lIncrease vehicle set speed in 1 mph (1.5 km/h) increments.
lIncrease vehicle set speed.
To temporarily increase vehicle speed press the accelerator pedal until the desired speed is reached. When the
accelerator pedal is released, the vehicle coasts back to the set speed. When it reaches the set speed, cruise control
operation continues.
To increase the vehicle set speed in 1 mph (1.5 km/h) increments, tap the SET+ switch. Each tap on the switch
increases vehicle speed.
To increase the vehicle set speed, press and hold the SET+ switch until the desired set speed is reached.
The vehicle set speed will increase if the following conditions are met:
lThe vehicle is under cruise control operation.
lVehicle speed is between 28 - 125 mph (45 - 200 km/h).
lThe brake pedal is not pressed.
lThe clutch pedal is not pressed (manual gearbox only).
lThe gearbox is not in park, reverse or neutral (automatic gearbox only).
Function
The vehicle responds as follows:
lIf the driver accelerates using the accelerator pedal, vehicle speed increases overriding pneumatic actuator
position. When the driver releases the accelerator pedal, the vehicle returns to the set speed.
lIf the SET+ switch is tapped, the driver increases the stored speed and vehicle speed by 1 mph (1.5 km/h) per
tap on the switch.
lIf the driver presses and holds the SET+ switch, the vehicle speed increases until the SET+ switch is released.
This becomes the new set speed for the cruise control ECU.
Switching off cruise control
Switching off cruise control allows the driver to regain control of vehicle speed. It erases the set road speed from the
cruise control ECU memory.
To switch off cruise control, press the cruise control master switch to the off position.
Function
When the cruise control master switch is turned off, the cruise control ECU switches off power to the vacuum pump
assembly. The vacuum dump valve opens releasing the vacuum in the pneumatic actuator, returning the throttle disc
to driver control via the accelerator pedal.

ENGINE MANAGEMENT SYSTEM - V8
ADJUSTMENTS 18-2-77
ADJUST ME NTS
Cable - throttle
$% 19.20.05
Adjust
1.Loosen outer cable locknuts.
2.Adjust the rear locknut until it is in contact with
the back of the abutment bracket, and the gap
between the throttle and the inner driven lever
is 0.5 mm ± 0.4 mm (0.020 ± 0.015 in).
3.Tighten cable front nut to lock cable to
abutment bracket.
Cable - cruise control
$% 19.75.11
Adjust
1.Ensure that the throttle cable is correctly
adjusted.

+ ENGINE MANAGEMENT SYSTEM -
V8, ADJUSTMENTS, Cable - throttle.
2.Loosen outer cable locknuts.
3.Adjust the rear locknut to obtain a 4.0 to 4.5
mm (0.157 to 0.177 in) gap, dimension 'A',
between the cruise control cable lever and the
throttle cable driven lever.
4.Tighten cable front locknut.

ENGINE MANAGEMENT SYSTEM - V8
REPAIRS 18-2-79
REPAIRS
Spark plugs
$% 18.20.02
Remove
1.Noting their fitted position, disconnect ht leads
from spark plugs.
2.Using a spark plug socket, remove 8 spark
plugs. Refit
1.Fit terminals to new spark plugs.
CAUTION: Do not attempt to adjust spark
plug gaps.
2.Fit spark plugs and tighten to 25 Nm (18 lbf.ft).
3.Connect ht leads to spark plugs ensuring they
are in the correct position.

ENGINE MANAGEMENT SYSTEM - V8
18-2-80 REPAIRS
Coil - ignition
$% 18.20.45
Remove
1.Remove upper inlet manifold assembly.

+ MANIFOLDS AND EXHAUST
SYSTEMS - V8, REPAIRS, Gasket - inlet
manifold - upper - Without Secondary Air
Injection.
2.Disconnect multiplugs from ignition coils.
3.Release ht leads from rocker covers and
disconnect ht leads from spark plugs.
4.Carefully manoeuvre ignition coil assembly
from between engine and bulkhead. 5.Noting their fitted position disconnect ht leads
from ignition coil.
6.Remove 3 screws securing ignition coil to
support bracket and remove coils.
Refit
1.Position ignition coil to support bracket, fit and
tighten screws.
2.Connect ht leads to ignition coil ensuring they
are in the correct position.
3.Carefully position ignition coil assembly
between engine and bulkhead.
4.Connect ht leads to spark plugs and secure ht
leads to rocker covers.
5.Connect multiplugs to ignition coils.
6.Fit upper inlet manifold assembly.

+ MANIFOLDS AND EXHAUST
SYSTEMS - V8, REPAIRS, Gasket - inlet
manifold - upper - Without Secondary Air
Injection.

ENGINE MANAGEMENT SYSTEM - V8
REPAIRS 18-2-81
Engine control module (ECM)
$% 18.30.01
Remove
1.Release fixings and remove battery cover.
2.Disconnect battery earth lead.
3.Remove fixings securing fascia RH closing
panel, release diagnostic socket RH drive
models, and remove panel.
4.Remove 2 fixings and remove 'A' post lower
trim. 5.Remove 2 nuts and release ECM from studs
and location on 'A' post lower panel.
6.Lower ECM into footwell and disconnect 5
multiplugs.
7.Remove ECM.
Refit
1.Position new ECM and connect multiplugs.
2.Fit ECM and secure with nuts.
3.Fit lower trim panel to 'A' post and secure with
fixings.
4.Fit diagnostic socket to closing panel, fit closing
panel and secure with fixings.
5.Connect battery earth lead.
6.Fit battery cover and secure with fixings.
7.Programme ECM and reset adaptions using
TestBook.

ENGINE MANAGEMENT SYSTEM - V8
18-2-82 REPAIRS
Sensor - engine coolant temperature
(ECT)
$% 18.30.10
Remove
1.Release turnbuckles and remove battery cover.
2.Disconnect battery earth lead.
3.Remove auxiliary drive belt.

+ CHARGING AND STARTING,
REPAIRS, Belt - auxiliary drive.
4.Remove 2 bolts securing alternator, release
alternator from support bracket and position
aside. 5.Disconnect multiplug from ECT sensor.
6.Remove sensor from inlet manifold and discard
sealing washer.
Refit
1.Clean sealant from threads in manifold.
2.Apply sealant, Part No. STC 50552 to sensor
threads.
3.Fit new sealing washer to ECT sensor and
tighten sensor to 10 Nm (7 lbf.ft).
4.Connect multiplug to ECT sensor.
5.Position alternator, fit bolts and tighten to 45
Nm (33 lbf.ft).
6.Fit auxiliary drive belt.

+ CHARGING AND STARTING,
REPAIRS, Belt - auxiliary drive.
7.Top up cooling system.
8.Connect battery earth lead.
9.Fit battery cover and secure with fixings.

ENGINE MANAGEMENT SYSTEM - V8
REPAIRS 18-2-83
Sensor - crankshaft position (CKP)
$% 18.30.12
Remove
1.Release fixings and remove battery cover.
2.Disconnect battery earth lead.
3.Raise front of vehicle.
WARNING: Do not work on or under a
vehicle supported only by a jack. Always
support the vehicle on safety stands.
4.Release fixings and remove underbelly panel.
5.Release CKP sensor multiplug from bracket.
6.Remove 2 bolts securing CKP sensor heat
shield and position aside.
7.Remove 2 nuts securing CKP sensor, remove
2 spacers, CKP sensor and sensor mounting.
8.Disconnect CKP sensor multiplug from engine
harness. Refit
1.Ensure all components are clean.
2.Connect CKP sensor multiplug to engine
harness.
3.Fit sensor mounting, CKP sensor, 2 spacers
and tighten CKP sensor retaining nuts to 6 Nm
(5 lbf.ft).
4.Fit CKP sensor heat shield and secure with
bolts.
5.Fit underbelly panel and secure with fixings.
6.Remove stand(s) and lower vehicle.
7.Connect battery earth lead.
8.Fit battery cover and secure the fixings.
9.Reset adaptions using TestBook.

ENGINE MANAGEMENT SYSTEM - V8
18-2-84 REPAIRS
Sensor - radiator temperature
$% 18.30.20
Remove
1.Disconnect battery earth lead.
2.Position container to collect coolant spillage.
3.Disconnect multiplug from sensor.
4.Remove sensor and discard sealing washer.
Refit
1.Fit new sealing washer to sensor.
2.Fit and tighten sensor.
3.Connect multiplug to sensor.
4.Refill cooling system.
5.Connect battery earth lead.
Sensor - camshaft position (CMP)
$% 18.30.24
Remove
1.Release fixings and remove battery cover.
2.Disconnect battery earth lead.
3.Raise front of vehicle.
WARNING: Do not work on or under a
vehicle supported only by a jack. Always
support the vehicle on safety stands.
4.Release fixings and remove underbelly panel.
5.Remove engine oil filter.

+ ENGINE - V8, REPAIRS, Filter - oil.
6.Disconnect engine harness from CMP sensor
and release CMP sensor multiplug from
bracket.
7.Remove bolt from clamp securing CMP sensor
to timing gear cover.
8.Remove clamp and CMP sensor. Discard 'O'
ring from CMP sensor.
Refit
1.Ensure CMP sensor is clean, fit new 'O' ring
and sensor to cover.
2.Fit clamp to CMP sensor and tighten bolt to 8
Nm (6 lbf.ft).
3.Fit sensor multiplug to bracket and connect
engine harness to multiplug.
4.Fit engine oil filter.

+ ENGINE - V8, REPAIRS, Filter - oil.
5.Fit underbelly panel and secure with fixings.
6.Lower vehicle and connect battery earth lead.
7.Fit battery cover and secure with fixings.