Land Rover Fuel Injection System Manual

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1191FUEL INJECTION SYSTEM1989 K”d;;;
rEST PROCEDURE1RESULTS - Check cables and units shown in boldF1
!i.Check engine speed signal
Voltmeter reading of 9.5 volts + 1 volt
Cable and resislor
Proceed to Test 6Voltmeter reading of zero volts
Check:-
1 1 /
-a-0
’ I’IGNITION ON
RR2631E
-EST PROCEDURE
i.Check operation
of pump relayRESULTS 
- Check cables and units shown in bold
Test lamp will illuminate for approximately
1 second when ignition is switched on
If 
0.K - Proceed to Test 8
Lamp does not illuminate
Check:-If OK proceed to Test 8
RR2632EIGNlTtON ON
446
ADDITION: SEPT. 88 
/ REVISED: MARCH 90 
						

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1,‘.FUEL INJECTION SYSTEM 
119 1
TEST PROCEDURERESULTS - Check cables and units shown in bold
7.Fault diagnosisPump relay circuitsVoltmeter reading of battery volts -
Suspect ECU
Voltmeter reading of zero volts
Check:-IGNITION ON
RR2833E
TEST PROCEDURE
I.Check operation of Fuel pump
NOTE: 
II is not possible to place the
multi-meter probes directly onto the
pump lerminals. A link lead attached
lo the pump is accessible behind the
rear left hand wheel located between
the chassis and stowage area floor
panel.
KEY:1. Inertia switch
2. Fuse 18RESULTS 
- Check cables and unhs shown in bold
Voltmeter reading of battery volts -
Pump operating - Proceed to Test 10
(A)Voltmeter reading of batteryvolts -Pump not operatingCheck:-
(B)Voltmeter reading of zero voltsCheck:-IGNITION ON
RR2634EContinuedADDITION: SEPT. 88 I REVISED: DEC. 88 
						

							1191FUEL INJECTION SYSTEM1989Tv\IYUCP(\VFR.--m.v . L..II
TEST PROCEDURERESULTS - Check cables and units shown in bold
9.Check purge valve. Part 1 - seating
Vacuum should hold for 2.5 minutes
1. Disconnect pipe from purge valve lo
If vacuum correct proceed to test 10
plenum (al plenum)
2. Connect vacuum pump to pipe to purge
valveIf vacuum incorrect check:3. Apply vacuum of 2.5 in/Hg3
0I-
IGNITION OFF
9R2212E
TEST PROCEDURE
10.Check purge valve. Part 2 - operation
1. Apply vacuum - 2.5 in/Hg, switch
ignition onRESULTS 
- Check cables and units shown in bold
Vacuum should be released
If OK proceed to test 11
2. Connect pins 16 and 
17 to earth to
energise pump relay.If vacuum not released check:
-m-
0
’ I ’IGNITION ON
RR2OlSE
-_48
ADDITION: SEPT. 88 
/ REVISED: DEC. 88
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							R”d;;;i 1989
FUEL INIECTION SYSTEM 119 1
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rEST PROCEDUREIl.Check injectors,
Injector circuitRESULTS - Check cables and units shown in bold
Ohm-meter reading of 4-4.5 Ohms 
-Proceed to Test 
12Ohm-meter reading of 5-6 Ohms 
-Suspect 1 injector
Ohm-meter reading of 8-9 Ohms 
-Suspect 2 injectors
Pin 13 left bank ‘A’ injectors 
1,3,5,7).Ohm-meter reading of 16-17 Ohms -Suspect 3 injectors
Check for open circuit injector(s) or wiring faults.
Ohm-meter reading of Infinity
Check:
IGNITION OFF
RR2535E
I-EST PROCEDURE
12.Check injectors,
Injector circuit
IPin 11 rightbank ‘B’ injectors 2,4,6,6)RESULTS 
- Check cables and units shown in bold
Ohm-meter reading of 4-4.5 Ohms 
-Proceed to Test 13
Ohm-meter reading of 5-6 Ohms 
-Suspect 1 injector
Ohm-meter reading of 8-9 Ohms 
-Suspect 2 injectors
Ohm-meter reading of 16-17 Ohms 
-Suspect 3 injectors
Check for open circuit injector(s) or wiring faults.
Ohm-meter reading of Infinity
Check:
IGNITION OFF
I.L”““bContinued
ADDITION: SEPT. 88 
/ REVISED: DEC. 8849 
						

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1191FUEL INIECT’IONSYSTEM1989 k”d;\;;ireading-temperature to
ature Conversion
IGNITION OFF
50ADDITION: SEPT. 88 / REVISED: DEC. 88 
						

							FUEL INJECTION SYSTEM 119 1Temperature Conversion
Should be
Ohms
9100 
- 9300
5700 
-5900IGNITION OFF
,::ContinuedADDITION: SEPT. 8851 
						

							l-i19 FUEL INJECTION SYSTEM
MT PROCEDURE
15.Check air bypass valve - Par( 1RESULTS 
- Check cables and units shown in bold
Ohm-meter reading of 40-60 Ohms 
-
Proceed to Test 16
Incorrect reading
Check:-
IGNITION 
OFF
‘EST PROCEDURE
16.Check air bypass valve - Part 2
I0RESULTS 
- Check cables and units shown in bold
Ohm-meter reading of 40-60 Ohms 
-Proceed to Test 17
Incorrect reading
Check:-
IWMOE
52ADDITION: SEPT. 88 
						

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iEST PROCEDURE
17.Check throttle potentiometer - Part I17RESULTS 
- Check cables and unils shown in bold
Ohm-meter reading of 4000-6000 Ohms 
-Proceed to Test 18Incorrect reading of Infinity
Check:-
KiNlTlON OFF
IW641EThrottle closed: 
0.085-0.545 volts) smooth
) swing) between
RR2642EContinued
ADDITION: SEPT. 88 
! REVISED: MAY 8953 
						

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TEST PROCEDURE
RESULTS - Check cables and units shown in bold
IS.Check output ofAirflow sensor
TIGNITION ON
IR2f343EVoltmeter reading of 
0.2-0.7 volts-Proceed to Test 20
Incorrect voltmeter reading
Check:-
PRECAUTION:Depressurize the fuel system when fitting the fuel pressure gauge or disconnecting/replacing fuel system
components.
CAUTION: Thoroughly clean the immediate area around the fuel filter and hose connections before
disconnecting the fuel feed line from the filter. Failure to do so could cause foreign matter to be
present in the fuel system which would be detrimental to the fuel system components.
WARNING: The spillage of fuel from the fuel filter is unavoidable when disconnecting the fuel feed
line, ensure that all necessary precautions are taken to prevent fire and explosion due to fuel vapour
and fuel seepage,
DEPRESSURIZING PROCEDURE‘.
a)Ignition off, pull pump relay off its terminal block.b)Crank engine for a few seconds -engine may fire and run until fuel pressure is reduced.
clSwitch off the ignition.
d)Connect fuel pressure gauge in the fuel supply line between the fuel rail and the fuel filter, adjacent to
the filter 
(see Test 20).
e)Reconnect the pump relay.
54
ADDITION: SEPT. 88 
/ REVISED: MAY 89 
						

							.“.. .‘C--ROVER 
lg8’FUEL INJECTION SYSTEM I19 1
‘. 1.1.:.
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rEST PROCEDURE
10.Check fuel system pressure
Service tool 18C 1500
NOTE: Insert the pressure
gauge in the fuel feed line
immediately after the fuel
line filter. The filter is
located beneath the right
hand rear wheel arch attached
lo the chassisRESULTS 
- Check cables and units shown in bold
(A)Expected reading 2,39-2,672 kgf/cm’
(34.0-38.0 p.s.i.)
(B)Pressure drop-max 0.7 kgf/cm2(10 p.s.i.) in one minute
Proceed to Test 21
IQNITION ON
0I-
IGNITION OFF
RR2644E--
Continued
ADDITION: SEPT. 88 
/ REVISED: MAY 8955