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.

+

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.

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.

+

MANIFOLDS AND EXHAUST

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.

+

CHARGING AND STARTING,

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.

+

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.

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).