cooling TOYOTA AVENSIS 2003 Service Owner's Manual

1606N±03
A57065
21


±
COOLING COOLING FAN SYSTEM (1CD±FTV)
16±41
AVENSIS REPAIR MANUAL (RM1018E)
COOLING FAN SYSTEM (1CD±FTV)
ON±VEHICLE INSPECTION
1. CHECK COOLING FAN OPERATION WITH LOW TEMPERATURE (Below 83
C (181
F))
(a) Turn the ignition switch ON.
(b) Check that the cooling fan stops.
(c) Disconnect the temperature detect switch connector.
(d) Connect the terminals on the temperature detect switch connector.
(e) Check that the cooling fan rotates.
If not, check the fuses, cooling fan relay and cooling fan, and check for \
a open circuit between the cooling
fan relay and temperature detect switch.
(f) Reconnect the temperature detect switch connector.
2. CHECK COOLING FAN OPERATION WITH HIGH TEMPERATURE (Above 93
C (199
F))
(a) Start the engine, and raise coolant temperature to above 93
C (199
F)
HINT:
Coolant temperature is the detected value by the temperature detect swit\
ch on the radiator lower tank.
(b) Check that the cooling fan rotates.
If not, replace the temperature detect switch.
3. INSPECT COOLING FANS
(a) Disconnect the cooling fan connector.
(b) Connect battery and ammeter to the cooling fan connec-tor.
(c) Check that the cooling fan rotates smoothly, and check
the reading on the ammeter.
Standard amperage:
Approx. 13.2 A at 20
C (68
F)
(d) Reconnect the cooling fan connector.
http://vnx.su

160N8±01

 




A35654
A30519
E34090
16±42
±
COOLING COOLING FAN SYSTEM (1CD±FTV)
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION
1. INSPECT COOLING FAN RELAY
(a) Continuity inspection. (1) Using an ohmmeter, check for continuity betweeneach terminal.
Specified condition:
Terminal No.Specified condition
1 ± 2Continuity
No continuity
3 ± 5Continuity
(Apply battery voltage terminals 1 and 2)
2. INSPECT COOLING FAN RELAY NO.2
(a) Continuity inspection. (1) Using an ohmmeter, check for continuity betweeneach terminal.
Specified condition:
Terminal No.Specified condition
1 ± 2
3 ± 4Continuity
No continuity
3 ± 5Continuity
(Apply battery boltage terminals 1 and 2)
3. INSPECT COOLING FAN RELAY NO.3
(a) Continuity inspection. (1) Using an ohmmeter, check for continuity between
each terminal.
Specified condition:
Terminal No.Specified condition
1 ± 2Continuity
No continuity
3 ± 5Continuity
(Apply battery voltage terminals 1 and 2)
http://vnx.su

P05962
Ohmmeter
±
COOLING COOLING FAN SYSTEM (1CD±FTV)
16±43
AVENSIS REPAIR MANUAL (RM1018E)
4. INSPECT TEMPERATURE DETECT SWITCH NO.2
(a) Using an ohmmeter, check that there is continuity be-
tween the terminals when the coolant temperature is
above 93
C (199
F).
Specified condition: Continuity
(b) Using an ohmmeter, check that there is no continuity be- tween the terminals when the coolant temperature is be-
low 83
C (181
F).
Specified condition: No continuity
http://vnx.su

1600R±14
±
COOLING COOLING FAN SYSTEM (1ZZ±FE/3ZZ±FE)
16±5
AVENSIS REPAIR MANUAL (RM1018E)
COOLING FAN SYSTEM (1ZZ±FE/3ZZ±FE)
ON±VEHICLE INSPECTION
HINT:
It is normal that the cooling fan sometime rotates when the ignition switc\
h is turned from ACC to ON.
1. CHECK COOLING FAN OPERATION WITH LOW TEMPERATURE (Below 94.5
C (202
F))
(a) Turn the ignition switch ON.
(b) Check that the cooling fan stops.
If not, check the cooling fan relay and engine coolant temperature sensor, and check if there is its connector
disconnection or circuit open between them.
(c) Disconnect the engine coolant temperature sensor connector.
(d) Check that the cooling fan rotates.
If not, check the fuses, cooling fan relay, ECM and cooling fan, and check for short in a circuit between the
cooling fan relay and the engine coolant temperature sensor.
(e) Reconnect the engine coolant temperature sensor connector.
2. CHECK COOLING FAN OPERATION WITH HIGH TEMPERATURE (Above 96
C (205
F))
(a) Start the engine, and raise coolant temperature to above 96
C (205
F).
HINT:
Coolant temperature is detected by the engine coolant temperature sensor\
on the water outlet.
(b) Check that the cooling fan rotates.
If not, replace the engine coolant temperature sensor.
3. INSPECT COOLING FAN
(a) Disconnect the cooling fan connector.
(b) Connect battery and ammeter to the connector.
(c) Check that the cooling fan rotates smoothly, and check the reading on the ammeter. Standard amperage: Approximately. 8 to 12 A at 20
C (68
F)
(d) Reconnect the cooling fan connector.
http://vnx.su

1600S±11
E34090
A30519
16±6
±
COOLING COOLING FAN SYSTEM (1ZZ±FE/3ZZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION
1. INSPECT COOLING FAN RELAY
(a) Continuity inspection. (1) Using an ohmmeter, check for continuity betweeneach terminal.
Specified condition:
Terminal No.Specified condition
1 ± 2Continuity
No continuity
3 ± 5Continuity
(Apply battery voltage terminals 1 and 2)
2. INSPECT COOLING FAN RELAY NO.2
(a) Continuity inspection. (1) Using an ohmmeter, check for continuity betweeneach terminal.
Specified condition:
Terminal No.Specified condition
1 ± 2
3 ± 4Continuity
No continuity
3 ± 5Continuity
(Apply battery boltage terminals 1 and 2)
3. INSPECT COOLING FAN RESISTOR
(a) Using an ohmmeter, measure the resistance between the terminals. Resistance: 1.17 to 1.43
at 20
C (68
F)
http://vnx.su

160MK±01
A76724
A79300Upper Hook
±
COOLINGRADIATOR ASSY(1ZZ±FE/3ZZ±FE)
16±11
AVENSIS REPAIR MANUAL (RM1018E)
RADIATOR ASSY(1ZZ±FE/3ZZ±FE)
REPLACEMENT
1.REMOVE RADIATOR SUPPORT OPENING COVER (See page 14±27)
2.REMOVE ENGINE ROOM COVER SIDE (See page 14±27)
3.ENGINE UNDER COVER SUB±ASSY NO.1 (See page 14±27)
4.DRAIN ENGINE COOLANT (See page 16±1)
5. DISCONNECT RADIATOR HOSE INLET
(a) Disconnect the radiator hose inlet from the radiator.
6. DISCONNECT RADIATOR HOSE OUTLET
(a) Disconnect the radiator hose outlet from the radiator.
7. DISCONNECT OIL COOLER INLET TUBE NO.1 (A/T TRANSAXLE)
(a) Disconnect the oil cooler inlet tube from the radiator.
8. DISCONNECT OIL COOLER OUTLET TUBE NO.1 (A/T TRANSAXLE)
(a) Disconnect the oil cooler outlet tube from the radiator.
9. REMOVE RADIATOR ASSY
(a) Disconnect the fan connector and the 2 harness clamps.
(b) Remove the 2 bolts and the relay block.
(c) Remove the 2 bolts, the 2 radiator support upper and theradiator.
(d) Remove the 2 support radiator LWRs from the radiator.
(e) Pinch and push each upper hook on the fan shroud to re- lease and remove the fan shroud from the radiator.
http://vnx.su

A79301
Upper Hook
Fan
Shroud
Radiator
16±12
±
COOLINGRADIATOR ASSY(1ZZ±FE/3ZZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
10.INSTALL RADIATOR ASSY
(a)Align the 2 keyways of the fan shroud with the 2 keys lo- cated on the lower bottom of the radiator and fit them.
(b)Install the fan should to the radiator with the 2 upper hooks. You can hear ºclickº sounds when the hooks are
securely fitted.
(c)Install the 2 support radiator LWRs to the radiator.
(d)Install the radiator with the 2 bolts and 2 radiator support
uppers.
Torque: 19 N
m (194 kgf
cm, 14 ft
lbf)
(e)Install the relay block with the 2 bolts.
(f)Connect the fan connector and 2 harness clamps.
11.ADD ENGINE COOLANT (See page 16±7)
12.CHECK FOR ENGINE COOLANT LEAKS (See page 16±1)
http://vnx.su

160N1±01
A78433
±
COOLING COOLING SYSTEM (1AZ±FE)
16±13
AVENSIS REPAIR MANUAL (RM1018E)
COOLING SYSTEM (1AZ±FE)
ON±VEHICLE INSPECTION
1. INSPECT COOLING SYSTEM FOR LEAKS
CAUTION:
To avoid the danger of being burned, do not remove the ra-
diator cap while the engine and radiator are still hot. Ther-
mal expansion will cause hot engine coolant and steam to
blow out from the radiator.
(a) Remove the radiator support opening cover.
(b) Remove the engine room cover side.
(c) Fill the radiator with coolant and attach a radiator cap tes-
ter.
(d) Warm up the engine.
(e) Pump it to 137 kPa (1.4 kgf/cm
2, 19.9 psi), and check that
the pressure does not drop.
If the pressure drops, check the hoses, radiator and water
pump for leaks. If there are no signs or traces of external coolant
leaks, check the heater core, cylinder block and head.
(f) Reinstall the engine room cover side.
(g) Reinstall the radiator support opening cover.
2. CHECK ENGINE COOLANT LEVEL AT RESERVOIR
(a) The engine coolant should be between the ºLOWº and ºFULLº li\
nes, when the engine is cold.
If low, check for leaks and add ºToyota Long Life Coolantº or equivalent up to the ºFULLº line.
3. CHECK ENGINE COOLANT QUALITY
(a) Remove the radiator cap.
CAUTION:
To avoid the danger of being burned, do not remove the radiator cap while the engine and radiator
are still hot. Thermal expansion will cause hot engine coolant and steam to\
blow out from the radiator.
(b) Check if there is any excessive deposits of rust or scale around the radiator\
cap and radiator filler hole; the coolant should be free from oil.
If excessively dirty, replace the coolant.
(c) Reinstall the radiator cap.
http://vnx.su

A73603
16±14
±
COOLING COOLING SYSTEM (1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
4. INSPECT FINS BLOCKAGE
(a) If fins are clogged, wash them with water or a steam cleaner and dry with compressed air.
NOTICE:

If the distance between the steam cleaner and the
core is too close, there is a possibility of damaging
the fins, so keep the following injection distance.
Injection Pressures
kPa (kgf/cm2, psi)
Injection Distance mm (in.)
2,942 to 4,903
(30 to 50, 427 to 711)300 (11.811)
4,903 to 7,845
(50 to 80, 711 to 1,138)500 (19.685)

If the fins are bent, straighten them with a screwdriver
or pliers.

Be careful not pour water directly onto electronic
components.
http://vnx.su

160N2±01
P13560
P00436
10mm
A51911
±
COOLING COOLING SYSTEM (1AZ±FE)
16±15
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION
1. INSPECT THERMOSTAT
HINT:
The thermostat is numbered with the valve opening tempera-
ture.
(a) Immerse the thermostat in water and gradually heat the
water.
(b) Check the valve opening temperature of the thermostat. Valve opening temperature:
80 to 84 C (176 to 183 F)
If the valve opening temperature is not as specified, replace the
thermostat.
(c) Check the valve lift. Valve lift: 10 mm (0.394 in.) or more at 95 C (203 F)
If the valve lift is not as specified, replace the thermostat.
(d) Check that the valve is fully closed when the thermostat is at low temperatures (below 77 C (171 F)).
If not closed, replace the thermostat.
2. INSPECT RADIATOR CAP SUB±ASSY
NOTICE:

If the radiator cap is contaminatied, rinse it with water.

Before using a radiator cap tester, wet the relief valve
and the pressure valve with engine coolant or water.

When performing following steps (a) and (b), keep the
tester at an angle of over 30  above horizontal.
http://vnx.su