Page 91
Fuel injection system 240-63
Error Continuity Malfunction Action
Code break or indicated
shorting
Incircuit
to ECU pin
no.;
E003 3 Throttle A Release the accelerator immediately
position sensor after starting forat least 20 seconds
(203) contacts B Check operation of throttle damper
constantly (dashpot)
open C Check setting and operation of throttle-
position sensor
D Check the wiring between pin 3 of the
ECU (200) and pin 1 of the
throttle-position sensor
E Check the wiring between pin 2 on the
throttle-position sensor (203) and
earthing point 201
F Check for good earth through engine
earthing point (201)
E103 3 Throttle- A Check the setting and operation of the
position throttle position sensor
sensor (203) B Check the wiring between pin 3 of the
contacts ECU (200) and pin 1 of the throttle
constantly position sensor (203)
closed (when C g00i/800S:
revs increased Check the wiring between pin 3 of the
from idling to ECU (200) and pin 7 of the EZK ECU
2500 rpm) (176) via connector 57
D Check the E2K ignition system
E005 5 Pin 50f ECU A Check the wiring between pin 5 of the
(200) not ECU (200) and earthing point 201
earthing B Check for good earth through engine
earthing point (201}
Saab 900
Page 92
240-64 Fuel injection system
Error Continuity Malfunction Action
Code break or indicated
shorting
in circuit
to ECU pin
no.:
E006 6 Airmass meter A Checkthe wiring between pin 3 of the
(205) not air mass meter (205) and:
earthing M88 onwards (non-Turbo): pin 2 and
earthing point 201
B Check the wiring between pin 4 on the
airmass meter (205) and engine
earthing point 201. Check for good
earth at earthing point
C Fitanew air mass meter (205)
EOO7T 7 Airmass meter A Check the wiring between pin 7 of the
(205) signal ECU (200) and pin 5 on the airmass
absent meter (205)
B Checkthe wiring between engine
earthing point 201 and pin 4 on the ECU (200)
C Fitanewair mass meter (205)
E107 7 Airmass meter A Check the wiring between pin 7 of the
(205) signal ECU (200) and pin 5 (M88 9000! onwards:
toa high pin 3) on the air mass meter (205)
B Check by eye that filament burn-off
function takes place
C Fitanewairmassmeter (205)
E207 7 Airmass meter See E107
(205) signal
too low
Saab 900
Page 93
ISS 3
Fuel injection system 240-65
Error
Code
Continuity
break or
shorting
in circuit
to ECU pin
no.:
Malfunction
indicated
Action
Air mass meter
(205) burn-off
function absent
Airmass meter
(205) burn-off
function
constantly
energized
System relay
12V supply
absent
System relay
12V supply
too low
%
A Repeat the test. Revthe engine above
2500 rpm for at least two seconds (SET
2500 RPM)
B Check the wiring between pin 8 on the
ECU (200) and pin 1 on the air mass meter (205)
C FitanewLH ECU (200)
A Check the wiring between pin 8 of the
ECU (200) and pin 4 (M88 onwards: pin
4) of the airmass meter (205)
B FitanewLH ECU (200)
A Check for 12 V supply at +30 terminal
on power distribution panel 230
B Check the wiring between +30 terminal
on the power distribution panel (230)
and pin 30 of system relay 229
C Check the witing between pin 87 onthe
system relay (229) and pin 9 of the EOU (200)
D Check the wiring between pins 30 and 86
onthe system relay (229)
E Fitanew system relay (229)
A Check that battery voltage at connector
7Sisatleast 10V
B Check the wiring between connector 75
and pin 30 on the system relay (229)
C Check the wiring between pin 87 onthe
system relay (229) and pin 9 on the ECU (200)
D Fitanewsystem relay (229)
Saab 900
Page 94
240-66 Fuel injection system
Error
Code
Continuity
break or
shorting
incircuit
to ECU pin
no.:
Malfunction
indicated
Action
E010
E011
E012
LO
11
12
Signal from
AlC valve pin
10 absent
LH ECU (200)
not earthing
Throttle-
position
sensor (203)
full-throttie
contacts
constantly open
Qanm
Check the wiring between pin 1 onthe
AlC valve (272) and pin 10 on the ECU
(200)
Check for 12 V supply at pin 2 on the
AlC valve (272)
(with ignition switched on)
Check the wiring between pin 2onthe
AlC valve (272) and pin 87 onthe pump
relay (102)
Check the wiring between pin 30 on the
pump relay (102) and the +30 supply
terminal (230)
Fitanew pump relay
Fitanew AIC valve (272)
Fitanew ECU
Check the wiring between pin 11. on the
ECU (200) and earthing point 201
Check for good earth at earthing point
(201) on engine
Check function by flooring accelerator
on command from LH-system tester.
Check display to see whether butterfly
open
Check setting and operation of
throttle-position sensor
Check wiring between pin 120n the ECU
(200) and pin 3.on the throttle-position sensor (203)
Check the wiring between pin 2 on the
throttle-position sensor (203) and earthing point 201
Check for good earth at earthing point
onengine (201)
Saab 900
Page 95
HM
Fuel injection system 240-67
Error Continuity Malfunction Action
Code break or indicated
shorting
in circuit
to ECU pin
no.:
Eii2 12 Throttle- A Release accelerator on starting
position B Check setting and operation of
sensor (203) throttle-position sensor (203)
full-throttle C CarswithAIc:
contacts Check the wiring between pin 12 on the
constantly closed ECU (200) and pin3 onthe
throttle-position sensor (203)
D Check for good earth at connector 60
E Check the wiring between connector 60
and pin 12 0n the ECU (200)
F Check the wiring between pin 12 of the
ECU (200) andterminal TKon the AC
relay (156)
H Check thatthe AC relay (156) isnot
earthing
E013 13 Pulsesto A Check the wiring between pin 13 on the
injection ECU (200) and pin 2 6n the injection
valves (206) valves (206)
absent B Check thewiring between pin 1 onthe
injection valves (206) and pin 87 on
the pump relay (102)
C Check that 12 V supply is present at
pin 30 onthe pump relay (102)
D Fitanew pump relay (102)
E FitanewLHECU
E1a3 13 Injection See E013
pulses erratic
Saab 900
Page 96
240-68 Fuel injection system
Error Continuity Malfunction
Action
Code break or indicated
shorting
incircuit
to ECU pin
no.:
E014 14 Air mass meter:
break in CO-
adjusting
circuit
E017 17 Pump relay
(102) control
citcuit faulty
£018 18 15 V supply
absent
E020 20 Oxygen (Lambda)
sensor (136)
signal absent
A Check the wiring between pin 14 on the
ECU (200) and pin 6 on the air mass
meter (205)
B Fitanewair mass meter (205)
A Check the wiring between pin 17 onthe
ECU (200) and pin 85 on the pump relay
(102)
B Check thewiring between pin 86 on the
pump relay (102) and pin 87 onthe
system relay (229)
(Turbo: via pressure switch 144)
C Check the wiring between pin 30 on the
system relay (229) and the +30 supply
terminal (230)
D Fitanewfuel pump relay (102)
E Fitanewsystem relay (229)
F FitanewLHECU
A Checkthe wiring between pin 18 on the
ECU (200) and the power distribution
panel (159)
B Checkthat 12 V supply is available at
the power distribution panel (159) when
the ignition ison
A Check the wiring between pin 20 on the
ECU (200) and connector 60
B Check the wiring between pin 5 on the
ECU (200) and the braid on the signal
lead
C Fitanew oxygen (Lambda) sensor
ami
Saab 900
Page 97
Fuel injection system 240-69
Error Continuity Malfunction Action
Code break or indicated
shorting
in circuit
to ECU pin
no;
E120 20 Oxygen (Lambda) A Set the Lambda system to the correct
sensor (136) value
signaltoo low B Check the voltage across the oxygen
sensor between connector 60 and earth
C Check that12 V supply is present
between pins 1 and 2 onconnector59
Check the wiring between pinSonthe
ECU (200) and the braid on the signal lead
Check the oxygen sensor preheating (136)
Check the fuel pressure (line pressure)
Check for air leakage in the Induction system
Check forairleaks in the exhaust
system between the engine and the oxygen Sensor
Check the operation and delivery flow
of the injection valves
J Fitanew oxygen sensor
K FitanewLH ECU (200)
Io 7m 0
E220 20 Oxygen (Lambda) A Setthe Lambda system to the correct
sensor (136) value
signal too high B Check the voltage across the oxygen
sensor between connector 60 and earth
Check that 12 V supply is present
between pins 1 and 2 onconnector 59
Check the oxygen sensor preheating (136)
Check the fuel pressure (line pressure)
Check the operation and delivery flow
of the injection valves
Fit anew oxygen sensor
Fita new LH ECU (200)
oO
= Oomo
E021 2: System relay A Check that battery voltage (12 V)is
(228) control present at terminal +30 on the power
circult faulty distribution panel (230)
B Check the wiring between terminal +30
on the power distribution panel (230)
and pin 86 on the system relay (229)
C Check the wiring between pin8
5 on the system relay (229) and pin 210nthe
ECU (200)
D Fitanewsystem relay (229)
E FitanewLHECU
Saab 900
Page 98
240-70 Fuel injection system
Error Continuity Malfunction Action
Code break or indicated
shorting
in circuit
to ECU pin
no.:
£023 23 Signal from A Checkthe wiring between pin 3 onthe
AlC valve AlC valve (272) and pin 23 onthe ECU
pin 23 absent (200)
B Checkthatbattery voltage (12 V) is
present at pin 2 on the AIC valve (with
ignition on)
C Check thewiring between pin 2 on the
AlC valve (272) and pin 87 onthe pump
relay (102)
D Check the wiring between pin 30.0n the
pump relay (102) and terminal +30 on
the power distribution panel (230)
E Fitanew pump relay
F FitanewAlC valve (204)
G FitanewLH ECU
AICO 23 AIC valve pulse A Setthe AIC system to the correct
ratio faulty value
E024 24 Engine load A Checkthe wiring between pin 24 on the
signal to EZK LH ECU (200) and pin 8 on the EZKECU
absent (non- (176)
Turbo) B FitanewLH ECU (200)
EQ25 25 ECU pin 25 A Check the wiring between pin 25 on the
notearthing ECU (200) and earthing point 201
B Cheok for good earth at engine earthing
point (201)
Saab 900
Page 99
Fuel injection system 240-71
Fault diagnosis
Key to quick-reference table
To replace
El = Systemrelay See page 240-113
F2 = Pumprelay See page 240-113
E3 = Pressure switch
E4 = Temperature sensor
(NTC resistor) See page 240-113
ES = Throttle-position sensor See page 240-114
E6 = Injection valves See page 240-114
E7 = Airmass meter See page 240-116
E7A = Filament, airmass meter
E7B = Filament burn-off
E7C = COcontent, %
E7D = Fuel system basic setting
(Cars with catalytic converter)
E8 = Electroniccontrol unit (ECU) See page 240-113
E8A = Inputsignalsto ECU
E8B = Signals from ECU to
injection valves
E8C = Fuel shut-off on starting
E8D = Enrichment
E8E = Warm-up period
E9 = ACcompressor
E10 = Oxygen (Lambda) sensor
Bl = Fuelsystem Fuel injection manifold:
See page 240-114
Fuel filter:
seé page 240-116
BiA = System pressure
B1B = Fuelpressure regulator See page 240-117
Bic = Residual pressure
B1D = Delivery pressure of fue! pump
B1E = Delivery flowof fuel pump
[1 = Leakage inthe induction system
2. = Auxiliary airvalve See page 240-117
M1 = Basic setting ofthrottle butterfly
M1A = Setting the idling speed
(N/A cars with catalytic converter)
M1B = Setting the idling speed
(cars with catalytic converter)
E = Electrical
B = Fuel
| = Induction
M = = Mechanical: removal and fitting of
components
Saab 300
Page 100
240-71
Fault symptom
Erratic idlin
BADOEWNE
g
Engine fails to start
Engine starts but stops immediately
Poor response on acceleration
Engine erratic in all speed ranges
Excessive fuel consumption
Engine fails to rev up (no power)
CO content too low
9 CO content too high
Fault symptom
a2 5
3456
12345
1 #345
45
t 9
78
789
78
Possible cause
System relay or pump
relay defective
Fuel pump not running
Auxiliary airvalve
defective
EGR valve defective
Defective throttle-
position sensor/-
enrichment function
Airmass meter (HLM)
Induction system
Fuel pressure too low
orno fuel pressure
Fuel pressure too high
Fuel capacity too low
Before starting to trace possible faults in the LH
system, check that the engine, ignition and elec-
trical system are adjusted in accordance with the
specifications.
Example of "Test procedure”: E1 = check the
system relay, and so on.
Check/Remedy
Check the voltage
Check the fuse for the
fuel pump, the power supply
the fuel relay and the
pressure switch (Turbo)
Check operation of
valve
Check operation of the
valve
Check by connecting an
ohmmeter across terminals
3and 18 on the throttle
position sensor
Check the filament,
the bum-off function
and that all connections
are good
Check the vacuum using
a vacuum gauge
Check the pressure,
the filter, the fuel
lines and the pressure
regulator
Check the intermediate
hose and suction hose
to the pressure regulator,
Check for blockage in the
fuel line or fora pinched
hose. Check the pressure
regulator.
Check capacity of fuel
pump
Test procedure
E1,E2
B1,£1,&2,E3
E5
E7A
11
B1
Bi
Bib, B1E