Discovery 2. Manual — part 498
ENGINE MANAGEMENT SYSTEM - V8
REPAIRS 18-2-71
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.
Coil - ignition
$% 18.20.45
Remove
1. Remove upper inlet manifold assembly.
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.
ENGINE MANAGEMENT SYSTEM - V8
18-2-72 REPAIRS
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.
SYSTEMS - V8, REPAIRS, Gasket - inlet
manifold - upper - Without Secondary Air
Injection.
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.
ENGINE MANAGEMENT SYSTEM - V8
REPAIRS 18-2-73
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.
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.
REPAIRS, Belt - auxiliary drive.
4. Remove 2 bolts securing alternator, release
alternator from support bracket and position
aside.
ENGINE MANAGEMENT SYSTEM - V8
18-2-74 REPAIRS
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 Loctite 577 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.
REPAIRS, Belt - auxiliary drive.
7. Top up cooling system.
8. Connect battery earth lead.
9. Fit battery cover and secure with fixings.
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).
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