Page 11
82 EKZ ignition system with tachometer and timing service instrument socket
EZK ignition system with tachometer and
timing service instrument socket
Saab 900
Page 12
90
APC-system
M1984—85
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Page 13
APC-system 91
Operation
The engine is equipped with an Automatic Perfor-
mance Control (APC) system, which enables the en-
gineto adjust itself automatically to the grade of fuel
supplied to JL at any particular time.
1984 and 1985 models
Tne APC system Is controlled by sontral unit 177,
woiehis supplied (+54) from fuse ‘LO via the 29-pole
white connector 152A. The unit receives signals from
several Sensors, processes the signals and then con-
trols the charging pressure of the turbocharger via
solenoid valve 179,
The system receives information from the following
Sensors:
* Knocking sensor 178, which senses any knocking
in the engine
© Pressure transmitter which senses the pressure in
the intake pipe-upstream of the butterfly valve.
The electrical signals from the sensors and from |gni-
tion coil 5 are fea continuously into the contro! unit
On the basis of the electrical signals received. the
unit then controls the solenoid valve and thus the
ooost pressure from the turbocharger. Since the
poost pressure iS continuously adjusted to the octane
rating of the fuel and the running conditions of the
engine. it has proved unnecessary toe provide the
adjustment margins that must normally be allowed to
avoid damage to the engine. As a result, maximum
energy can be-extracted from the fuel used on any
particular pecasion
Cars with the Turbo L6 engine and Crurse Control are
equipped with Vacuum switch 233, which is actuated
by the vacuum pump Via‘a vacuum hose When the
contacts oper. the control unit reduces the boost
pressure to the basic value,
1986 models
The contro! unil has been replaced on the 1986 mod-
als (new pin numbers),
The operation is the same as on 1984 and 1985
models; except that the contral pulses are supplied
from jenition pulse amplifier 147 instead of from the
ignitioncoll, Inaddition, brake hahtswitch 29 applies
a signal when the car is braked, which eauses the
control unit to reduce the boost pressure to the basic
value
Fault-tracing hints
The following ltems must always be taken into ac-
count before fault-tracing is started on the APC. sys-
tem:
1. Diseannect the connector from the control unit
2. Disconnect the connector from the component
which [5 suspected to be faully
3. Use an ohmmeter to check the wiring for any
open circuits, etc.
For other particulars, see the fault-tracing section in
the Service Manual, Group 2, Engine
Saab 300
Page 14
Locations of components C
5
29
60
73
a7
152A
152C
177
178
179
480
233
lgnitiencoil
on the cross- member above the ragiate:
Earthing point
on the radiator cross-member f
Earthing point
inthe luggage compartment
Fuse box
in the electrical distribution box In the e~
gine compartment, on the left-hand wheel”
housing
Brake light switch
al the brake pedal
Single-pole connector
in the engine compartment, behind the e%:
pansion tank
Timing service instrument socket (TSI
socket)
in the electrical distribution box in the en
gine compartment, on the left-hand wheel
housing
\gnition pulse amplifier
in the electrical distrinution box in (he er
gine compartment, on the lefi-hand wher
frousing
29-pole white connector
29-pole black connector
in the electrical distribution box in the en
gine compartment on the left-hand wheel
housing. The connector 1s aceessible from,
the interior of the-car.
Contral unit forthe APC system
41984 and 1985. models; under the back
seat, on the left-hand side
1986 models: in the engine compartment,
forward of the left-hana wheel housing
Knocking sensor
on the engine, below the intake manifold
Saienoid valve
onthe radiator fan casing
Pressure transmitter
under the facia, te the left of the steering:
column (behind the knee shield)
Vacuum switeh .
inthe engine compartment, onthe jeft-hant
wheel housing
Page 15
Components |
ator
M1984 —85
he ea.
wheel
‘he ex-
tL (TS!
he en-
wheel
he en-
wheel
he en.
wheel
¢ from
) back
ment,
18
told
7
eering
Vi oF Al
i | Il
TES ||P TS||
-hand
Page 16
BIS PIU SS IVE UUEIVIS
+X +30 +X +X +30 +X
eB M1984 a Bu M1985—86
BR/VT RO25 394 BR/VT
0.75 ——"" RD 0.75 0.75
SE,NOFI 588 SE,NO,Fl
Sa 40 paces
31
~ 312A
Isv 0.75
cise S07 3
a1 41
GN/RD 10 GN/RO 10
(fu T}ot1528
6 [121452 121452
L42j 1528 Les
Fc +54 +54 +54 +54 +54 +54
41a GN/RO 1.0 1B inc jam ak GN/RD 10 ine jc jvm
GN/RO 10 roe rine VT 10 GN/RD LO \vr 25 VT 25 VT 10
| i 1 1 1
!
| (l} 9 422 [ills 7122 | 3 |22 ble Ube 122 aig 7422, J 2 122
L l | J l
hha bl 16 216 Aba 116 n ath
GN 0.75 GN 0.75 GL/RO 0.75 GL/RO 1.0 BL 0.75 | GN 0.75 GL/RD 15 GL/RD 10 BL 0.75
Peon TF a = 7” 7")
1 [311528 | s}152A 1 f2st452C Er W152B st [nt152B 1 7311528 251152 1152B 0} 481528
Loo uy »* as) a a
116A GL/RO_0.75
116 n 26 44a 116 n 2%
GL/RD 0.75 GL/RD 1.0 BL 0.75 GN 0.75 GL/RD 15 GL/RD 1.0 BL 0.75
448 GN 0.75) 116A _GL/RD 0.75
1A @) 48 > 6A @)48
BL 0.75, BL 0.75
352 351 NA 2168 1160 116C TA 2148
GN 0.75 GN 0.75 GL/RD_0.75 BL_0.75 GL/RO_0.75 GL/RD 0.75 | GL7RO_0.75 BL_0.75
; 7 7 4 7 Tia) (7 at) 15) (7) Ti 47)
‘| 7 1 1 i) iL 1 7
@)143 169 @]25 ] 116 Q] 143 169 @{25 6] 116
206
BR/VT 0.75
Tf
2158
hh
GN 0.75 us
593 GN 0.75 593 GN 0.75
uv 3 181 43) 1181
206
GN 0.75
466A GN 0.75 is 162 467A BR/VT 0.75 i 162
60
GN 0.75 7
466C GN 0.75 467C BR/VT 0.75
91 & 163 4 163
Sv 0.75
4666 GN 0.75 467G BR/VT 0.75
4 189 4 189
466 GN 0.75 4668 GN 0.75 467 BR/VT 0.75 LY 4678 BR/VT 0.75
4 190 S 4 190
466E GN 0.75 of 468 GN 0.75 467E_BR/VT ee 468 GN 0.75
=} : 4 190A foe} . 4 190A
4660 GN 0.75 4670 BR/VT 0.75
4 491 4 491
466F_GN 0.75 69) 468 GN 0.75 467F_BR/VT 075 00468 GN 075
fe—s} 4 191A f= 4 191A
44A_GN 0.75 44B GN 0.75
a
tT q
| a |
| |47
18
2
a
59
BR/VT 0.75
1986 98
58 BR/VT 0.75 a 267
S9A 61
BR/VT = JBR/VT 0S
0s
61A_GN 0.75
s9 59
BRAT LOS BRAVE GL 05 }
448 QSfsv_ br 05 168 QOsv. BROS | 153 154
62. SV 0.75
193 318B 65 193
SV 0.75 Sv075 | SV 0.75 SV 0.75
- e
3 73 rh} 3
Saab 900
Page 17
Lighting forcontrols 139
Operation
There are several market versions of the lighting for
the controis. This section covers all markets except
the U.S.A., Canadian and Japanese markets.
There are two diagrams, i.e. one for the 1984 models
and the other for the 1985 and 1986 models. They
show the supply to the switches, etc. on cars with
built-in lamps.
Rheostat 16
The supply to rheostat 16 is live when light switch 10
is in position 1 or 2, via the 29-pole red connector
152B and fuse 18 (the same fuse that supplies the
parking lights on the right-hand side of the car).
Cars with driving lights are equipped with additional
cable 220 (brown/white), and the system is thus sup-
plied, regardless of the position of the light switch.
The brightness of the following instrument lighting
can be steplessly adjusted by means of rheostat 16 in
combined instrument 47:
18 Combined instrument lighting
148 Ashtray illumination
153 Lighting for the cigarette lighter
154 Lighting for the heater controls
Switches on the centre console
tf the car is equipped with electric windows, the
brightness of the built-in lamps in the electric window
regulator switches will remain constant.
162 Switch for driver’s door electric window
regulator
163 Switch for co-driver’s door electric window
regulator
189 Switch for the rear-door electric window
regulators
190 Switch for left-hand rear electric window
regulator
190A Switch for left-hand rear electric window
: regulator
» 191 Switch for right-hand rear electric window
4 regulator
| 191A Switch for right-hand rear electric window
regulator
i (190A and 191A are located in the respective rear
| doors.)
7 Switch 181 for the electrically operated sunroof and
e gear indicating light 91 (on cars with automatic trans-
; mission) are supplied via the light switch.
Other switches
When the ignition switch is in the drive position, the
lamps in the following switches are supplied (from
distribution terminal +54) via a resistor in the respec-
tive switch, which reduces the brightness of the light.
When the switch is depressed, the resistor is by-
passed, and the light reaches full brightness.
25 Hazard warning light switch
116 Switch for the electrically heated rear win-
dow
143 Recirculation switch, AC
169 AC switch
1985 and 1986 models
The operation is the same as for the 1984 models,
but the supply from fuse 18 differs somewhat.
In addition, the dial lighting for the radio (267) con-
nected to connector 98 is adjusted via rheostat 16
(1986 models only).
The pin numbers shown in parentheses on certain
switches apply to the 1985 models only.
Fault-tracing hints
1. Check the appropriate fuses and check that the
supply to them is live.
2. Check the bulbs and check that the supply to
them is live.
3. Check the connectors, cable harnesses and
earth connections.
Page 18
Locations of components 163 Switch for co-driver’s door electric wind
; : regulator
s Earning pein between the front seats, on the centre c
in the facia
sole
10 Light switch ;
, ; 169 Switch, AC
on the left-hand side of the facia aa the facia
16 ie nacre A Il 181 Switch for the electrically operated sunroof
between the front seats, at the front on
18 Combined instrument lighting centre console
fi thier Gaeaihiaen NSecimeMt, Bee INSU 189 Switch for the rear-door electric window
ment panel
regulators
22 Fuse box between the front seats, on the centre con-
in the electrical distribution box in the en- sole
ales cOnpanMient, Gnthe fehi-hanel wheel 190 Switch for left-hand rear electric window
housing
regulator
25 Hazard warning light switch between the front seats, on the centre con-|
on the facia sole
47 Combined instrument 190A Switch for left-hand rear electric window
on the instrument panel regulator i
48 Cigarette lighter in the left-hand rear door
on the facia 191 Switch for right-hand rear electric window
regulator
59 2-pole connector
on the facia, behind the cigarette lighter oe the front seats, on the centre con-
60 Single-pole connector ; : —
ane if @s0h rear daur ane between the front 191A seal for right-hand rear electric window
seats, under the front section of the centre kev a Cais warned d
eonsole in the right-hand rear door
91 Gear indicating light
between the front seats, at the gear selector
98 10-pole connector (for radio 267)
in the facia, behind the panel for the radio
116 Switch for the electrically heated rear win-
dow
on the facia
143 Recirculation switch, AC
on the facia
148 Ashtrayillumination
on the facia, in the ashtray
152A 29-pole white connector
152B 29-pole red connector
152C 29-pole black connector
in the electrical distribution box in the en-
gine compartment, on the left-hand wheel
housing. The connector is accessible from
the interior of the car.
; 153 Lighting for the cigarette lighter
on the facia, at the cigarette lighter
154 Lighting for heater controls
on the facia, at the respective heater control
162 Switch for driver’s door electric window
regulator
between the front seats, on the centre con-
sole
Saab 900
Page 19
194 Fuel gauge and warning lamp
Fuel gauge and warning lamp
M1984 M1985—86
+30 +15
i j 123%
GN/VT 18
|
1 [ye lee
es)
GN/VT 19
@ | 159
1236 1236
GN/VT 0.75 GA/¥T 0.75
, '
nf, 928
Eo
236
GN/VT 0.75 igs
/¥T O78
sami seminal
'
|
| B )47A 478 | FY
Y mmm _—— |
93 185 185
SV 475 GR 075 aR 075
3
oe et
' 7 24
ee : 458
1s 1
GR 0.75 BR 075
8. 57
2 | 186 OR 0.75 my ts BR 0.75 |
sel we crost dS / |, Se RIGI AS |i,
ae —? vi SV O75
91
SV O75 67
— 59
262
SV 25
f779
Page 20
195
Fuel gauge and warning lamp
Operation
The fuel gauge and the warning lamp for the fuel
reserve keep the driver informed of the fuel level in
the tank. The wiring on 1984 models differs from that
of 1985 and 1986 models.
1984 models
When the ignition switch is in the drive position, a
positive supply (+15) is taken via the 29-pole white
connector 152A to:
e Fuel level gauge 47D in the combined instrument
and through fuel level transmitter 46 in the fuel
tank to earth, and
® Fuel reserve warning lamp 47B and through the
fuel level transmitter in the fuel tank to earth.
Fuel level transmitter 46 adjusts the voltage so that
the fuel gauge reading will correspond to the level
sensed by the transmitter float in the tank.
When the fuel content of the tank has dropped to
about 7 dm# (litres) or less, the fuel reserve warning
lamp will be earthed through the transmitter and the
lamp will light up,
1985 and 1986 models
The operation is the same as on 1984 models, but
the supply is taken via fuse 22. In addition, fuel level
transmitter 46 is connected by means of a 3-pole
connector (57).
Fault-tracing hints
The fuel gauge and the warning lamp for the fuel
reserve will be operative when the ignition switch is in
the drive position.
1984 models
1. Check the bulb and check that the supply to its
terminals in the combined instrument is live.
2. Check that the terminals of the fuel gauge and
the fuel level transmitter are live.
3. Check the connectors, cable harnesses and the
earth connection of the fuel level transmitter.
1985 and 1986 models
1. Check fuse 22 and check that the supply to it is
live.
2. Check the bulb and check that the supply to its
terminals in the combined instrument is live.
3. Check that the terminals of the fuel gauge and
the fuel level transmitter are live.
4. Check the connectors, cable harnesses and the
earth connection of the fuel level transmitter.