Range Rover Classic. Manual — part 177
ELECTRICAL
1
FAULT DIAGNOSIS
LUCAS CONSTANT ENERGY IGNITION SYSTEM -
V8i
Preliminary Checks
Inspect battery cables and connections to ensure they
are clean and tight. Check electrical condition of
battery.
Inspect all L.T. connections, ensure they are clean
and tight. Check H.T. leads are correctly positioned
and not shorting to ground against any engine
components. Wiring harness and individual cables
should be firmly fastened to prevent chaffing.
Pick-up air gap
Check air gap between pick-up limb and reluctor teeth
is 0.20 - 0.35 mm, using a non-ferrous gauge.
NOTE: Air gap is set initially at factory and
will only require adjusting if tampered with
or when pick-up module is replaced.
TEST 1:
H.T. Sparking
Remove coil/distributor H.T. lead from distributor
cover and hold approximately 6mm from engine block,
using suitable insulated pliers. Switch ignition ’On’ and
operate starter.
Regular sparking indicates fault in H.T. distribution,
plugs, timing or fuelling, proceed to Test 6. If no spark
or weak spark occurs proceed to Test 2.
TEST 2:
L.T. Voltage
Switch ignition ’On’ - engine stationary.
(a)
Connect voltmeter to points in circuit indicated
by V1 to V4 and make a note of voltage
readings.
(b)
Compare voltages obtained with specified
values listed below:
Expected readings
V1
More than 12 volts.
V2
1 volt maximum below volts at V1.
V3
1 volt maximum below volts at V1.
V4
0 volt - 0.1 volt.
(c)
If all readings are correct proceed to Test 3.
(d)
Check incorrect reading(s) with chart to identify
area of possible faults, i.e. faults listed under
heading SUSPECT and rectify.
(e)
If coil and amplifier is suspected, disconnect L.T.
lead at coil, repeat V3. If voltage is still incorrect,
fit new coil. If voltage is now correct, check L.T.
lead, if satisfactory fit new amplifier.
(f)
If engine will not start proceed to Test 3.
86
ELECTRICAL
2
FAULT DIAGNOSIS
1
2
3
4
SUSPECT
L
*
*
*
DISCHARGED BATTERY
*
L
L
*
IGN. SWITCH AND/OR
WIRING
*
*
L
*
COIL OR AMPLIFIER
*
*
*
H
AMPLIFIER GROUND
Key
*
Expected Voltage
H
Voltage higher than expected
L
Voltage lower than expected
TEST 3:
Amplifier Switching
Connect voltmeter between battery positive (+ve)
terminal and H.T. coil negative (-ve) terminal.
Voltmeter should register 0 volts.
Switch ignition ’On’, voltmeter should still register 0
volts.
Crank engine, voltmeter reading should increase
when cranking, in which case proceed to Test 5.
If no increase in voltage during cranking proceed to
Test 4.
ELECTRICAL
3
FAULT DIAGNOSIS
TEST 4:
Pick-up Coil Resistance
Remove amplifier.
Connect ohmmeter leads to two pick-up terminals in
body of distributor.
The ohmmeter should register between 2k and 5k
ohm if pick-up is satisfactory. If ohmmeter reading is
correct, check all connections between pick-up and
amplifier, if satisfactory, fit new amplifier. If engine still
does not start carry out Test 5.
Change pick-up if ohmmeter reading is incorrect. If
engine still does not start proceed to Test 5.
TEST 5:
Coil H.T. Sparking
Remove existing coil/distributor H.T. lead and fit test
H.T. lead to coil tower. Using suitable insulated pliers,
hold free end about 6mm from engine block and crank
engine. There should be good H.T. sparking.
If weak or no sparking, fit new coil, repeat test.
H.T. sparking good, repeat test with original H.T. lead.
If sparking is good carry out Test 6.
If weak or no sparking, fit new H.T. lead, if engine will
not start carry out Test 6.
86
ELECTRICAL
4
FAULT DIAGNOSIS
TEST 6:
Rotor Arm
Remove distributor cover. Disconnect coil H.T. lead
from cover, using insulated pliers hold about 3mm
(0.13 in) above rotor arm electrode and crank the
engine.
There should be no H.T. sparking between rotor and
H.T. lead. If satisfactory carry out Test 7.
If H.T. sparking occurs, an earth fault on rotor arm is
indicated. Fit new rotor arm. If engine will not start
carry out Test 7.
TEST 7:
Visual and H.T. Cable Checks
Examine:
Should be:
1.
Distributor Cover
Clean, dry, no tracking marks
. . . . . . . . . . . . . .
2.
Coil Top
Clean, dry, no tracking marks.
. . . . . . . . . . . . . . . . ...
3.
H.T. Cable Insulation
Must not be cracked, chafed or perished
. . . . . . . . . . . ...
4.
H.T. Cable Continuity
Must not be open circuit
. . . . . . . . . . . ..
5.
Sparking Plugs
Clean, dry, and set to correct gap
. . . . . . . . . . . . . .
NOTE:
1.
Reluctor
Must not foul pick-up or leads
. . . . . . . . . . . . . . . . ...
2.
Rotor and Insulation Cover
Must not be cracked or show signs of tracking marks
. . . . . . . . . .
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