Radiator Fan Control; Engine Torque Control; A/C System Control - Subaru SVX 1992 Manual

2-7 [M608]
FUEL INJECTION SYSTEM
8. RADIATOR FAN CONTROL
The radiator fan operation has four steps : off (OFF), low
(Lo), medium (MD), and high (HI) to reduce noise and
load .
The operating condition of the radiator fan is deter-
mined by the combination of signals sent from the A/C
switch, A/C trinary switch, vehicle speed sensor 2 and
water temperature sensor.
Vehicle speed Water temperature A/C trinary switch Operation
A/C switch
' O
X
O
ECU output signal of
radiator fan
10(6) 20112)
X
89(192) 95(203)
X
13 16
Fan relay NO .
Main fan Sub fan
Unit : km/h (mph) Unit : °C (°F) Unit : kg/cm2 No . 1 No. 2
(RH) (LH)
X - LO LO
X
0 -
MD MD
X
0 X - MD MD
0 0 HI HI
X - LO LO
0
X
0
0
0 HI HI
0 X HI HI
0 HI HI
X - -
OFF
OFF
X
X
0 - LO LO
0 X - - OFF OFF
0
11
- MD MD
0 : Signal ON X : signal OFF
9. ENGINE TORQUE CONTROL
In order to reduce gear shift shocks and protect trans-
mission gears, engine torque is controlled shifting up
under heavy loads or when the transmission is in the
manual mode .
10. A/C SYSTEM CONTROL
The ECU controls ON/OFF of the air conditioning (A/C)
system . In addition, it controls the amount of electric
current sent to the NC compressor, thereby controlling
the quantity of refrigerant sent out by the compressor .
When the A/C switch is set to ON when the coolant
temperature is high, the refrigerant delivery quantity is
reduced to lower the coolant temperature, thereby
protecting the engine itself . The same control system is
adopted to smooth engine speed variations when the
A/C switch is turned ON or OFF .
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