Lexus ES300 (1997 year). Manual — part 305
S04602
No.1 ECT Switch
CO037–05
P01924
Ohmmeter
S04601
No.2 ECT
Switch
P06722
Ohmmeter
CO–32
–
COOLING
ENGINE COOLANT TEMPERATURE (ECT) SWITCH
949
1997 LEXUS ES300 (RM511U)
ENGINE COOLANT
TEMPERATURE (ECT) SWITCH
INSPECTION
1.
INSPECT NO.1 ECT SWITCH
(a)
Drain engine coolant.
(b)
Remove the ECT switch.
(c)
Using an ohmmeter, check that there is no continuity be-
tween the switch terminals when the coolant temperature
is above 98
°
C (208
°
F).
If there is continuity, replace the switch.
(d)
Using an ohmmeter, check that there is continuity be-
tween the switch terminals when the coolant temperature
is below 88
°
C (190
°
F).
If there is no continuity, replace the switch.
(e)
Install the ECT switch.
(f)
Fill with engine coolant.
2.
INSPECT NO.2 ECT SWITCH
(a)
Drain engine coolant.
(b)
Remove the ECT switch.
(c)
Using an ohmmeter, check that there is continuity be-
tween the switch terminals when the coolant temperature
is above 94
°
C (201
°
F).
(d)
Using an ohmmeter, check that there is no continuity be-
tween the switch terminals when the coolant temperature
is below 83
°
C (181
°
F).
If continuity is not as specified, replace the switch.
(e)
Install the ECT switch.
(f)
Fill with engine coolant.
S05391
Engine
Main Relay
CO038–01
S04944
Ohmmeter
Continuity
Ohmmeter
Ohmmeter
No
Continuity
Continuity
2
1
5
4
3
S04945
Ohmmeter
Ohmmeter
No
Continuity
Continuity
2
1
5
4
3
Battery
–
COOLING
ENGINE MAIN RELAY
CO–33
950
1997 LEXUS ES300 (RM511U)
ENGINE MAIN RELAY
INSPECTION
1.
REMOVE ENGINE MAIN RELAY (Marking: ENGINE
MAIN)
2.
INSPECT RELAY CONTINUITY
(a)
Using an ohmmeter, check that there is continuity be-
tween terminals 3 and 5.
If there is no continuity, replace the relay.
(b)
Check that there is continuity between terminals 2 and 4.
If there is no continuity, replace the relay.
(c)
Check that there is no continuity between terminals 1 and
2.
If there is continuity, replace the relay.
3.
INSPECT RELAY OPERATION
(a)
Apply battery voltage across terminals 3 and 5.
(b)
Using an ohmmeter, check that there is no continuity be-
tween terminals 2 and 4.
If there is continuity, replace the relay.
(c)
Check that there is continuity between terminals 1 and 2.
If there is no continuity, replace the relay.
4.
REINSTALL ENGINE MAIN RELAY
S05390
No.1 Cooling
Fan Relay
CO039–01
S04941
Ohmmeter
Continuity
Ohmmeter
Continuity
4
1
3
2
S04940
No Continuity
Ohmmeter
4
1
3
2
Battery
S04943
Ohmmeter
Continuity
Ohmmeter
Continuity
30
85
86
87a
S04942
Ohmmeter No
Continuity
30
85
86
87a
Battery
CO–34
–
COOLING
COOLING FAN RELAY
951
1997 LEXUS ES300 (RM511U)
COOLING FAN RELAY
INSPECTION
1.
INSPECT NO.1 COOLING FAN RELAY
(a)
Remove the No.1 cooling fan relay. (Marking: FAN NO.1)
(b)
Inspect the No.1 cooling fan relay continuity. (DENSO)
(1)
Using an ohmmeter, check that there is continuity
between terminals 1 and 2.
If there is no continuity, replace the relay.
(2)
Check that there is continuity between terminals 3
and 4.
If there is no continuity, replace the relay.
(c)
Inspect the No.1 cooling fan relay operation. (DENSO)
(1)
Apply battery voltage across terminals 1 and 2.
(2)
Using an ohmmeter, check that there is no continu-
ity between terminals 3 and 4.
If there is continuity, replace the relay.
(d)
Inspect the No.1 cooling fan relay continuity. (BOSCH)
(1)
Using an ohmmeter, check that there is continuity
between terminals 85 and 86.
(2)
If there is no continuity, replace the relay.
(3)
Check that there is continuity between terminals 30
and 87a.
If there is no continuity, replace the relay.
(e)
Inspect the No.1 cooling fan relay operation. (BOSCH)
(1)
Apply battery voltage across terminals 85 and 86.
(2)
Using an ohmmeter, check that there is no continu-
ity between terminals 30 and 87a.
If there is continuity, replace the relay.
(f)
Install the No.1 cooling fan relay.
S05387
No.2 Cooling
Fan Relay
S04948
Ohmmeter
Continuity
Ohmmeter
No Continuity
Continuity
4
1
3
2
Ohmmeter
5
S04949
Ohmmeter
No Continuity
Continuity
4
1
3
2
Ohmmeter
5
Battery
S05388
No.3 Cooling
Fan Relay
S04947
No Continuity
Continuity
1
2
Ohmmeter
5
Ohmmeter
3
–
COOLING
COOLING FAN RELAY
CO–35
952
1997 LEXUS ES300 (RM511U)
2.
INSPECT NO.2 COOLING FAN RELAY
(a)
Remove the No.2 cooling fan relay. (Marking: FAN NO.2)
(b)
Inspect the No.2 cooling fan relay continuity.
(1)
Using an ohmmeter, check that there is continuity
between terminals 1 and 2.
If there is no continuity, replace the relay.
(2)
Check that there is continuity between terminals 3
and 4.
If there is no continuity, replace the relay.
(3)
Check that there is no continuity between terminals
3 and 5.
If there is continuity, replace the relay.
(c)
Inspect the No.2 cooling fan relay operation.
(1)
Apply battery voltage across terminals 1 and 2.
(2)
Using an ohmmeter, check that there is no continu-
ity between terminals 3 and 4.
If there is continuity, replace the relay.
(3)
Using an ohmmeter, check that there is continuity
between terminals 3 and 5.
If there is no continuity, replace the relay.
(d)
Install the No.2 cooling fan relay.
3.
INSPECT NO.3 COOLING FAN RELAY
(a)
Remove the No.3 cooling fan relay. (Marking: FAN NO.3)
(b)
Inspect the No.3 cooling fan relay continuity.
(1)
Using an ohmmeter, check that there is continuity
between terminals 1 and 2.
If there is no continuity, replace the relay.
(2)
Check that there is no continuity between terminals
3 and 5.
If there is continuity, replace the relay.
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