Land Rover Fuel Injection System Manual

1987 KANCltROVER
”FUEL INJECTION SYSTEM
CAUTION: The fuel system incorporates fine
metering components that would be affected by
any dirt in the system; therefore it is essential
that working conditions are scrupulously clean.
If it is necessary to disconnect any part of the
fuel injection system, the system MUST be
depressurized. All openings left open after the
removal of any component from the fuel system,
MUST be sealed off 
(0 prevent ingress of dirt.
ENGINE 
SEllING PROCEDURE
If a major overhaul...

‘.
ro;;; 1987
FUEL INJECTION SYSTEM
CONTINUITY TEST PROCEDURE
: 
”
..’.IThe continuity procedure and instructions on the
following pages must be followed precisely to
prevent damage occurring to any of the fuel system
components.To enable the tests to be carried out when the 40
way multi-plug is connected to the E.C.U., it is
necessary to remove the two screws securing the
shroud to the plug to enable the multi-meter
probes to be inserted into the back of the
appropriate pin.CAUTION: Tests that require...

FUEL INJECTION SYSTEM1987 ;;“d’;‘;;iTESTS 
- Using a Muhi-MeterThe following continuity tests are intended as a guide to identifying where a fault may be within a circuit;
reference should be made to the fuel injection circuit diagram for full circuit information.
KEY
TO SYMBOLS
OHMMETER
CONNECTIONS
ROAD SPEED
INPUT (SPEED
TRANSDUCER)COOLANT
TEMPERATURE
SENSOR
RR1782E8
iNlTlON SWITCb
VOLTMETER
CONNECTIONS
GEARINPUT SWITCH
INHIBITORSWITCH
AIR BYPASSVALVEELECTRONIC CONTROL UNIT
AND MULTIPLUG
MAIN RELAY...

”NOTE: All tests are carried out from the electronic control unit (ECU) harness multi-plug unless stated
otherwise in the test procedure.
..
:,:.:.A
R”;;; 1987
FUELINJECTIONSYSTEM b-6 1
1rEST PROCEDURE
2.Check ignition supply to ECU
rEST PROCEDURE
1.Check battery supply to ECURESULTS . Check cables and units shown in bold
Voltmeter reading of battery volts -
(mimimum battery voltage 10 volts)
Proceed to Test 2
Voltmeter reading of zero volts
Check:-
1
IGNlTlON OFF
RRl816ERESULTS 
- Check cables and units...

l-l
RANGE
19 FUEL INJECTION SYSTEMlg8’ ROVER
rEST PROCEDURE
I.Check operation of
Main relay
RESULTS - Check cables and units shown in boldVoltmeter reading of battery volts 
-Proceed to Test 5
Voltmeter reading of zero volts 
-Proceed to Test 4
IGNITION ON
RR1818E
‘EST PROCEDURE1RESULTS - Check cables and units shown in bold
I.
1.
5
4
R10
Fault DiagnosisMain relay circuitsA.Voltmeter reading of battery volts -Check:-If OK Suspect ECU
6.Voltmeter reading of zero voltsCheck:-
clI-
lGNsnoNoPF
--..~
-...

k”d;‘;r; 1987
FUEL INJECTION SYSTEM 119 1
‘EST PROCEDURE
i.Check operationListen for audible ‘click’ from pump
of pump relayrelay.If 
0.K - Proceed to Test 7
IGNtTION ON
RR182OE
[EST PROCEDURE
i.Fault diagnosisPump relay circuits
1I?R1821EIGNITION ONRESULTS 
- Check cables and units shown in bold
No audible ‘click’ from pump relay
Check:-If OK proceed to Test 6.
RESULTS 
- Check cables and units shown in bold
Voltmeter reading of battery volts 
-Suspect ECU
Voltmeter reading of zero volts
Check:-...

rEST PROCEDURERESULTS - Check cables and units shown in bold
7.Check operation of Fuel pumpVoltmeter reading of battery volts -Pump operating 
- Proceed to Test 8NOTE: It is not possible lo place the
multi-meter probes directly onto the
pump terminals. A link lead attached
to the pump is accessible behind the
real left hand wheel located between
the chassis and stowage area floor
panel.
(A)Voltmeter reading of battery
volts -Pump not operating
Check:‘-
KEY:1. Inertia switch
2. Fuse 18(6)Voltmeter reading...

1.‘:; .( : . .,‘. .::i.. .~
K’^d;\ir; 1987
FUEL INJECTION SYSTEM 119 1
~~‘EST PROCEDURE
I.Check engine speed signal
Cable and resistor
W1823E
TEST PROCEDURE
9.Check injectors,
Injector circuit
(Pin 
13 left bank injectors 1,3,5,7).
clI-IGNITION OFF
lR1824 ERESULTS 
- Check cables and units shown in bold
Voltmeter reading of battery volts 
-Proceed to Test 9
Voltmeter reading of zero volts
Check:-RESULTS 
- Check cables and units shown in bold
Ohm-meter reading of 
4-5 Ohms -Proceed to Test 10
Ohm-meter...

. ..’-:;,.i :.. ‘...’
. .::’?,
. . i.FUEL INJECTION
SYSTEM
‘EST PROCEDURE
0.Check injectorsInjeclor circuit
pin 
II rightbank
njectors 2,4,6,6)RESULTS 
- Check cables and units shown in bold
Ohm-meter reading of 4-5 Ohms 
-Proceed to Test 11.Ohm-meter reading of 5-6 Ohms 
-Suspect 1 injectorOhm-meter reading of 8-9 Ohms -Suspect 2 injectorsOhm-meter reading of 16-17 Ohms -
Suspect 3 injectorsCheck for open circuit injector(s) or wiring faults.
Ohm-meter reading of Infinity
Check:
10
0L-
IGNITION OFF...

;;^d;;t; 1987
FUEL INJECTION SYSTEM 119 1
‘EST PROCEDURE
2.Check coolant temperature
thermistor (sensor)RESULTS 
- Check cables and units shown in bold
Correct reading-Temperature to
resistance
-ProceedtoTest 13
(Refer to Temperature Conversion
Chart below.
Fuel and CoolantOhm-meter Reading
TemperatureShould be
“C“FOhms-1001409100-930000
325700-59002006802400-260040010401100-1300601400
500-70080°176O
300-40010002120150-200Incorrect Ohm-meter reading
Check:-
0 I-- -
IGNtllON OFF
RR1827EContinuedREVISED:...