2001 TOYOTA AVALON coolant

CO0WT-01
B09040
- COOLINGRADIATOR
CO-17
1210 Author
: Date
:
2001 AVALON (RM808U)
REMOVAL
HINT:
At the time of installation, please refer to the following items.

Start the engine, and check for coolant and A/T fluid
leaks.

Check the A/T fluid level (See page DI-160).
1. REMOVE BATTERY AND BATTERY TRAY
2. REMOVE ENGINE UNDER COVER
3. DRAIN ENGINE COOLANT
4. DISCONNECT NO.3 ENGINE ROOM RELAY BLOCK
FROM RADIATOR
5. DISCONNECT NO.1 COOLING FAN CONNECTOR
6. DISCONNECT WIRE CLAMPS FROM NO.1 FAN
SHROUD
7. DISCONNECT NO.2 COOLING FAN CONNECTOR
8. DISCONNECT NO.1 ECT SWITCH WIRE CONNECTOR
9. DISCONNECT WIRE CLAMPS FROM NO.2 FAN
SHROUD
10. DISCONNECT UPPER RADIATOR HOSE FROM RA-
DIATOR
11. DISCONNECT LOWER RADIATOR HOSE FROM RA-
DIATOR
12. DISCONNECT A/T OIL COOLER HOSES FROM RA-
DIATOR
13. REMOVE RADIATOR AND COOLING FANS AS-
SEMBLY
(a) Remove the 2 bolts and 2 upper supports.
Torque: 12.8 N´m (130 kgf´cm, 9 ft´lbf)
(b) Lift out the radiator, and remove the radiator and cooling
fans assembly.
(c) Remove the 2 lower supports.
14. REMOVE NO.1 ECT SWITCH
15. REMOVE NO.1 COOLING FAN FROM RADIATOR
Remove the 2 bolts and cooling fan.
Torque: 5.0 N´m (50 kgf´cm, 44 in.´lbf)
16. REMOVE NO.2 COOLING FAN FROM RADIATOR
Remove the 2 bolts and cooling fan.
Torque: 5.0 N´m (50 kgf´cm, 44 in.´lbf)

CO02T-03
B04153Stud BoltJiggle Valve
15°15°
CO-12
- COOLINGTHERMOSTAT
1205 Author
: Date
:
2001 AVALON (RM808U)
INSTALLATION
1. PLACE THERMOSTAT IN WATER PUMP
(a) Install a new gasket on to the thermostat.
(b) Align the thermostat jiggle valve with the upper stud bolt,
and insert the thermostat in the water inlet housing.
HINT:
The jiggle valve may be set within 15° of either side of the pre-
scribed position.
2. INSTALL WATER INLET
Install the water inlet with the 3 nuts.
Torque: 8 N´m (80 kgf´cm, 69 in.´lbf)
3. INSTALL WATER INLET PIPE
(a) Install a new O-ring to the water inlet pipe.
(b) Apply soapy water to the O-ring.
(c) Connect the water inlet pipe to the water inlet.
(d) Install the bolt holding the water inlet pipe to the LH cylin-
der head.
Torque: 19.5 N´m (200 kgf´cm, 14 ft´lbf)
4. INSTALL ENGINE WIRE PROTECTOR
5. CONNECT NO.2 ECT SWITCH CONNECTOR
6. CONNECT HEATER HOSES
7. REINSTALL AIR CLEANER HOSE WITH RESONATOR
8. INSTALL V-BANK COVER
(a) Using 5 mm hexagon wrench, install the V-bank cover
with the 3 cap nuts.
(b) Press down the V-bank cover fastener.
9. FILL WITH ENGINE COOLANT
10. START ENGINE AND CHECK FOR LEAKS
11. RECHECK ENGINE COOLANT LEVEL

CO0SW-02
A10518
5 mm
Hexagon
Wrench
B08906
B06725
B04150
CO-10
- COOLINGTHERMOSTAT
1203 Author
: Date
:
2001 AVALON (RM808U)
REMOVAL
HINT:
Removal of the thermostat would have an adverse effect, caus-
ing a lowering of cooling efficiency. Do not remove the thermo-
stat, even if the engine tends to overheat.
1. DRAIN ENGINE COOLANT
2. REMOVE V-BANK COVER
(a) Using a 5 mm hexagon wrench, remove the 3 cap nuts.
(b) Loosen the V-bank cover fastener counterclockwise.
(c) Remove the V-bank cover.
3. WARM UP ENGINE
Allow the engine to warm up to normal operating temperature.
4. REMOVE AIR CLEANER HOSE WITH RESONATOR
5. DISCONNECT HEATER HOSES
6. DISCONNECT NO.2 ECT SWITCH CONNECTOR
7. DISCONNECT ENGINE WIRE PROTECTOR FROM
WATER INLET AND RH CYLINDER HEAD
Remove the nut and disconnect the clamp, and disconnect the
engine wire protector from the water inlet and cylinder head.
8. DISCONNECT WATER INLET PIPE FROM WATER IN-
LET AND LH CYLINDER HEAD
(a) Remove the bolt, and disconnect the inlet pipe from the
water inlet.
(b) Remove the O-ring from the inlet pipe.
9. REMOVE WATER INLET AND THERMOSTAT
(a) Remove the 3 nuts, water inlet and thermostat.
(b) Remove the gasket from the thermostat.

CO02M-03
A10834
RH Fender Apron Seal
Generator Drive Belt
Engine Moving
Control Rod
No.2 RH Engine
Mounting Bracket
Ground Strap
Connector PS Pump Drive Belt
Engine Coolant Reservoir Hose
: Specified torque
64 (650, 47)
32 (320, 23)
N´m (kgf´cm, ft´lbf)
- COOLINGWATER PUMP
CO-3
1196 Author
: Date
:
2001 AVALON (RM808U)
WATER PUMP
COMPONENTS

CO02O-03
P12487
- COOLINGWATER PUMP
CO-7
1200 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION
1. INSPECT WATER PUMP
(a) Visually check the drain hole for coolant leakage.
If leakage is found, replace the water pump.
(b) Turn the pulley, and check that the water pump bearing
moves smoothly and quietly.
If necessary, replace the water pump.
2. INSPECT TIMING BELT COMPONENTS
(See page EM-19)

CO02P-03
P12942
CO-8
- COOLINGWATER PUMP
1201 Author
: Date
:
2001 AVALON (RM808U)
INSTALLATION
1. INSTALL WATER PUMP
Install a new gasket and the water pump with the 4 bolts and 2
nuts.
Torque: 8 N´m (80 kgf´cm, 69 in.´lbf)
NOTICE:
Do not get oil on the gasket.
2. INSTALL NO.3 TIMING BELT COVER
(See page EM-59)
3. INSTALL NO.2 IDLER PULLEY (See page EM-21)
4. INSTALL CAMSHAFT TIMING PULLEYS
(See page EM-21)
5. INSTALL TIMING BELT (See page EM-21)
6. FILL WITH ENGINE COOLANT
7. START ENGINE AND CHECK FOR LEAKS
8. RECHECK ENGINE COOLANT LEVEL

CO0WS-01
P12942
CO-6
- COOLINGWATER PUMP
1199 Author
: Date
:
2001 AVALON (RM808U)
REMOVAL
1. DRAIN ENGINE COOLANT
2. REMOVE TIMING BELT (See page EM-15)
3. REMOVE CAMSHAFT TIMING PULLEYS
(See page EM-15)
4. REMOVE NO.2 IDLER PULLEY (See page EM-31)
5. REMOVE NO.3 TIMING BELT COVER
(See page EM-15)
6. REMOVE WATER PUMP
Remove the 4 bolts, 2 nuts, water pump and gasket.

DI4DO-02
A00022
4-pulse
Combination
MeterECM 4-pulse
From
Speed SensorABS ECU DI-178
- DIAGNOSTICSAUTOMATIC TRANSAXLE
334 Author
: Date
:
2001 AVALON (RM808U)
CIRCUIT INSPECTION
DTC P0500 Vehicle Speed Sensor Malfunction
CIRCUIT DESCRIPTION
The speed sensor for ABS detects the wheel speed and sends the appropriate signals to the ABS ECU.
The ECU converts these signals in to a 4-pulse signal and outputs it to the combination meter.
After this signal is converted into a more precise rectangular waveform by the waveform shaping circuit in-
side the combination meter, it is then transmitted to the ECM. The ECM determines the vehicle speed based
on the frequency of these pulse signals.
DTC No.DTC Detecting ConditionTrouble Area
P0500
Satisfying all of the following conditions, 2 sec. (Intake air tem-
perature: -10 °C or more) or 8 sec. (Intake air temperature:
less than -10 °C) elapsed.
(c) After 2 sec. (the engine coolant temperature: 20 °C or
more) or 30 sec. (the engine coolant temperature: less than
20 °C) with the park/neutral position switch set to P, N posi-
tion.
(d) No abnormality of the throttle position sensor is detected.
(e) After 0.5 sec. or more with the ignition switch turned ON.
(f) No vehicle speed is signal to ECM.
(g) The engine rpm is equal to the speed sensor rpm or more
when the throttle opening angle is as shown below.
1. The throttle opening angle is less than 13° and the engine
rpm is 2,350 or more.
2. The throttle opening angle is less than 21° and the engine
rpm is 2,680 or more.
3. The throttle opening angle is less than 30° and the engine
rpm is 2,835 or more.
4. The throttle opening angle is less than 30° and the engine
rpm is 3,145 or more.

Open or short in vehicle speed sensor circuit

ABS speed sensor

Combination meter

ECM

ABS ECU

Automatic transaxle (clutch, brake or gear etc.)
Clutch or brake slips or gear is broken (2-trip detection logic)