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THE COOLING FAN ECU RECEIVES VARIOUS SIGNAL, I.E., THE ENGINE RPM SIGNAL FROM THE IGNITER, COOLANT TEMPERATURE
SIGNAL FROM THE ENGINE COOLANT TEMP. SENSOR (WATER TEMP. SENSOR), A/C REFRIGERANT PRESSURE SIGNAL FROM A/C
SINGLE PRESSURE SW.
THE COOLING FAN ECU JUDGES THE ENGINE BASED ON SIGNALS FROM ABOVE MENTION, DRIVES THE SOLENOID VALVE AND
CONTROLS THE SPEED OF THE COOLING FAN STEPLESSLY
FAIL–SAFE FUNCTION
WHEN THE MALFANCTION IS DETECTED BY THE ENGINE COOLANT TEMP. SENSOR (WATER TEMP. SENSOR) OR SOLENOID VALVE,
THE FAIL–SAFE FUNCTION OF THE COOLING FAN ECU JUDGES THE SITUATION TO ALLOWS THE COOLING SYSTEM TO CONTINUE
OPERATION.
A 2 A/C SINGLE PRESSURE SW
2–3 : OPEN ABOVE APPROX. 15.58KG/CM
2
(221.2PSI, 1527KPA)
CLOSED BELOW APPROX. 12.56 KG/CM
2
(178.4PSI, 1231KPA)
C14 COOLING FAN ECU
1–GROUND : APPROX. 12 VOLTS WITH THE IGNITION SW ON
9–10 : 2.5 VOLTS AT 20°C (68°F) AND IGNITION SW ON
1.2 VOLTS AT 80°C (176°F) AND IGNITION SW ON
8– 4 : 10–14 VOLTS AT A/C PRESSURE SW ON (OPEN)
0–3 VOLTS AT A/C PRESSURE SW OFF (CLOSE)
4–GROUND : ALWAYS CONTINUITY
E 5 ENGINE COOLANT TEMP. SENSOR (WATER TEMP. SENSOR) (FOR COOLING FAN)
1–2 : 1.5K AT 80°C (176°F)
0.7K AT 110°C (230°F)
: PARTS LOCATION
CODE SEE PAGE CODE SEE PAGE CODE SEE PAGE
A 2 28 D 1 28 S 1 29
C14 32 E 5 30
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODE SEE PAGE JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1A 20 COWL WIRE AND J/B NO. 1 (INSTRUMENT PANEL LEFT)
3A
24
COWL WIRE AND J/B NO 3 (BEHIND COMBINATION METER)
3C
24 COWL WIRE AND J/B NO. 3 (BEHIND COMBINATION METER)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODE SEE PAGE JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
EC1 38 (1MZ–FE) ENGINE WIRE AND ENGINE ROOM MAIN WIRE
IP2 44 ENGINE WIRE AND COWL WIRE
: GROUND POINTS
CODE SEE PAGE GROUND POINTS LOCATION
EB 38 (1MZ–FE) FRONT LEFT FENDER
EC 38 (1MZ–FE) INTAKE MANIFOLD RH
: SPLICE POINTS
CODE SEE PAGE WIRE HARNESS WITH SPLICE POINTS CODE SEE PAGE WIRE HARNESS WITH SPLICE POINTS
I18 44 ENGINE WIRE
23
12
5
34
6X8910
12
12
A2 C14 S1E5 BROWNGRAYBLACK D1 BLACK
6
XX X
XX X X
X
X
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