Lexus GS300/400 (2000 year). Service manual — part 123
B02035
ECT Switch
Connector
ECT
Switch
O–Ring
CO0AJ–01
P05962
Ohmmeter
–
COOLING (2JZ–GE)
ENGINE COOLANT TEMPERATURE (ECT) SWITCH
CO–31
1569
ENGINE COOLANT
TEMPERATURE (ECT) SWITCH
INSPECTION
1.
DRAIN ENGINE COOLANT
2.
REMOVE ECT SWITCH
(a)
Disconnect the connector.
(b)
Remove the ECT switch.
(c)
Remove the O–ring from the ECT switch.
3.
INSPECT ECT SWITCH
(a)
Using an ohmmeter, check that there is no continuity be-
tween the terminals when the coolant temperature is
above 93
°
C (199
°
F).
If there is continuity, replace the switch.
(b)
Using an ohmmeter, check that there is continuity be-
tween the terminals when the coolant temperature is be-
low 83
°
C (181
°
F).
If there is no continuity, replace the switch.
4.
REINSTALL ECT SWITCH
(a)
Install a new O–ring to the ECT switch.
(b)
Install the ECT switch.
(c)
Connect the connector.
5.
REFILL WITH ENGINE COOLANT
6.
START ENGINE AND CHECK FOR COOLANT LEAKS
B01376
Radiator
Fan Main
Relay
CO0AK–01
B00019
Ohmmeter
Continuity
Ohmmeter
Ohmmeter
No Continuity
Continuity
2
1
5
4
3
B00020
Ohmmeter
Ohmmeter
No Continuity
Continuity
2
1
5
4
3
Battery
CO–32
–
COOLING (2JZ–GE)
RADIATOR FAN MAIN RELAY
1570
RADIATOR FAN MAIN RELAY
INSPECTION
1.
REMOVE RELAY BOX COVER
2.
REMOVE RADIATOR FAN MAIN RELAY (Marking:
RAD FAN MAIN)
3.
INSPECT RADIATOR FAN MAIN RELAY
(a)
Inspect the relay continuity.
(1)
Using an ohmmeter, check that there is continuity
between terminals 3 and 5.
If there is no continuity, replace the relay.
(2)
Check that there is continuity between terminals 2
and 4.
If there is no continuity, replace the relay.
(3)
Check that there is no continuity between terminals
1 and 2.
If there is continuity, replace the relay.
(b)
Inspect the relay operation.
(1)
Apply battery positive voltage across terminals 3
and 5.
(2)
Using an ohmmeter, check that there is no continu-
ity between terminals 2 and 4.
If there is continuity, replace the relay.
(3)
Check that there is continuity between terminals 1
and 2.
If there is no continuity, replace the relay.
4.
REINSTALL RADIATOR FAN MAIN RELAY
5.
REINSTALL RELAY BOX COVER
B00924
No.1 Cooling
Fan Relay
CO0AL–01
B00021
Ohmmeter
Continuity
Ohmmeter
Continuity
4
1
3
2
B00022
No Continuity
Ohmmeter
4
1
3
2
Battery
B01373
No.2 Cooling
Fan Relay
A00970
Continuity
Ohmmeter
No Continuity
Continuity
4
1
3
2
Ohmmeter
5
Ohmmeter
–
COOLING (2JZ–GE)
COOLING FAN RELAY
CO–33
1571
COOLING FAN RELAY
INSPECTION
1.
INSPECT NO.1 COOLING FAN RELAY
(a)
Remove the relay box cover.
(b)
Remove the No.1 cooling fan relay. (Marking: FAN NO.1)
(c)
Inspect the No.1 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.
(d)
Inspect the No.1 cooling fan relay operation.
(1)
Apply battery positive 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.
(e)
Reinstall the No.1 cooling fan relay.
(f)
Reinstall the relay box cover.
2.
INSPECT NO.2 COOLING FAN RELAY
(a)
Remove the relay box cover.
(b)
Remove the No.2 cooling fan relay. (Marking: FAN NO.2)
(c)
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.
A00971
Ohmmeter
No Continuity
Ohmmeter
Continuity
4
1
3
2
5
Battery
B01375
No.3 Cooling
Fan Relay
A00968
No Continuity
Continuity
1
2
Ohmmeter
5
Ohmmeter
3
A00969
Ohmmeter
Continuity
1
3
2
5
Battery
CO–34
–
COOLING (2JZ–GE)
COOLING FAN RELAY
1572
(d)
Inspect the No.2 cooling fan relay operation.
(1)
Apply battery positive 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.
(e)
Reinstall the No.2 cooling fan relay.
(f)
Reinstall the relay box cover.
3.
INSPECT NO.3 COOLING FAN RELAY
(a)
Remove the relay box cover.
(b)
Remove the No.3 cooling fan relay. (Marking: FAN NO.3)
(c)
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.
(d)
Inspect the No.3 cooling fan relay operation.
(1)
Apply battery positive voltage across terminals 1
and 2.
(2)
Using an ohmmeter, check that there is continuity
between terminals 3 and 5.
If there is no continuity, replace the relay.
(e)
Reinstall the No.3 cooling fan relay.
(f)
Reinstall the relay box cover.
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