2001 TOYOTA AVALON heater

DI-8
- DIAGNOSTICSENGINE
164 Author
: Date
:
2001 AVALON (RM808U)
HINT:
Take care not to turn the ignition switch OFF. Turning the ignition
switch OFF switches the diagnosis system from the check
mode to the normal mode, so all DTC, etc. are erased.
(10) After checking the DTC, inspect the applicable cir-
cuit.
4. FAIL-SAFE CHART
If any of the following codes is recorded, the ECM enters fail-safe mode.
DTC No.Fail-Safe OperationFail-Safe Deactivation Conditions
P0100Ignition timing fixed at 10° BTDCReturned to normal condition
P0110Intake air temp. is fixed at 20°C (68°F)Returned to normal condition
P0115Engine coolant temp. is fixed at 80°C (176°F)Returned to normal condition
P0120VTA is fixed at 0°The following condition must be repeated at least 2 times con-
secutively 0.1 V
VTA
0.95 V, SPD = 0 km/h
P0135
P0141
P0155
P1135
P1155
The heater circuit in witch an abnormality is detected is
turned offIgnition switch OFF
P0325
P0330Max. timing retardationIgnition switch OFF
P1300Fuel cutReturned to normal condition
5. CHECK FOR INTERMITTENT PROBLEMS
TOYOTA hand-held tester only:
By putting the vehicle's ECM in the check mode, 1 trip detection logic is possible instead of 2 trip detection
logic and sensitivity to detect open circuits is increased. This makes it easier to detect intermittent problems.
(1) Clear the DTC (See step 2).
(2) Set the check mode (See step 3).
(3) Perform a simulation test (See page IN-20).
(4) Check the connector and terminal (See page IN-30).
(5) Handle the connector (See page IN-30).
6. BASIC INSPECTION
When the malfunction code is not confirmed in the DTC check, troubleshooting should be performed in order
for all possible circuits to be considered as the cause of the problems. In many cases, by carrying out the
basic engine check shown in the following flow chart, the location causing the problem can be found quickly
and efficiently. Therefore, use of this check is essential in engine troubleshooting.
1 Is battery positive voltage 11 V or more when engine is stopped?
NO Charge or replace battery.
YES
2 Is engine cranked?

AB0119H01298H01299
Airbag Sensor Assembly
ON
ACC
IG2
(+) (-)
H01249
ON
DI-478
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
634 Author
: Date
:
2001 AVALON (RM808U)
2 Check source voltage.
PREPARATION:
Connect negative (-) terminal cable to the battery.
CHECK:
(a) Turn ignition switch ON.
(b) Measure the voltage between body ground and each of
IG2 and ACC on the sensor and operate electric system
(defogger, wiper, headlight, heater blower, etc.).
OK:
Voltage: 10 - 14 V
NG Check harness between battery and airbag sen-
sor assembly, and check battery and charging
system.
OK
3 Does SRS warning light turn off?
PREPARATION:
(a) Turn the ignition switch to LOCK.
(b) Connect the steering wheel pad connector.
(c) Connect the front passenger airbag assembly connector.
(d) Connect the side airbag assembly connectors.
(e) Connect the seat belt pretensioner connectors.
(f) Connect the airbag sensor assembly connectors.
(g) Connect the front airbag sensor connectors.
(h) Connect the side airbag sensor assembly connectors.
(i) Turn the ignition switch to ON.
CHECK:
Operate electric system (defogger, wiper, headlight, heater
blower, etc.) and check that SRS warning light goes off.
NO Check for DTCs. If a DTC is output, perform trou-
bleshooting for the DTC. If a normal code is out-
put, replace airbag sensor assembly.
YES
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check.

Water Bypass Hose
A10522
PS Pressure Tube
Throttle Body Bracket
Engine WireThrottle Position
Sensor Connector
Vacuum Hose Brake Booster
39 (400,29)
IAC Valve
Connector
Accelerator Cable
Purge Hose
Hose Vacuum

Gasket
VSV Connector for No.2 ACIS
Engine Coolant
Reservoir Hose
43 (440,32)
ECT Sender
Gauge Connector
ECT Sensor
Connector
Grand Strap
Connector
15 (150,11)
Water Outlet
15 (150,11)
Water Bypass
Hose
Upper Radiator
HoseFuel Inlet Hose
Injector Connector Intake Manifold
Assembly

Retainer
Heater Hose

GasketIgnition Coil
Connector

Non-reusable part: Specified torque
N´m (kgf´cm, ft´lbf)
19.5 (200, 14)
No.1 Engine
Hanger
VSV Connector for
EVAP
Ground Cable
PCV Hose Ground Cable
Air Intake Chamber
Assembly

Gasket
Spark PlugIgnition Coil
Ground Strap
DLC1
Gasket
Fuel Hose Clamp
VSV Connector
for No.1 ACIS
Throttle Cable
- ENGINE MECHANICALCYLINDER HEAD
EM-27
1011 Author
: Date
:
2001 AVALON (RM808U)

A07428
86
5 43 2
1
910
7
117
A09699
8 mm Hexagon Wrench
A09695
Throttle Body
Bracket
Engine
Hanger
EM-68
- ENGINE MECHANICALCYLINDER HEAD
1052 Author
: Date
:
2001 AVALON (RM808U)
26. INSTALL INTAKE MANIFOLD ASSEMBLY
(a) Install the intake manifold, delivery pipe and injectors as-
sembly with the 9 bolts, 2 plate washers and 2 nuts. Uni-
formly tighten the bolts and nuts in several passes and in
the sequence shown.
Torque: 15 N´m (150 kgf´cm, 11 ft´lbf)
(b) Connect the fuel inlet hose to the fuel filter.
CAUTION:
Perform connecting operations of the fuel tube connector
(quick type) after observing the precaution.
(See page SF-1)
(c) Connect the heater hose to the intake manifold.
27. RETIGHTEN WATER OUTLET MOUNTING BOLTS
AND NUTS
Tighten the 2 bolts and 2 nuts.
Torque: 15 N´m (150 kgf´cm, 11 ft´lbf)
28. INSTALL AIR INTAKE CHAMBER ASSEMBLY
(a) Using an 8 mm hexagon wrench, install a new gasket and
the air intake chamber assembly with the 2 bolts and 2
nuts. Uniformly tighten the bolts and nuts in several
passes.
Torque: 43 N´m (440 kgf´cm, 32 ft´lbf)
(b) Install the No.1 engine hanger with the 2 bolts.
Torque: 39 N´m (400 kgf´cm, 29 ft´lbf)
(c) Install the throttle body bracket with the 2 bolts.
Torque: 19.5 N´m (200 kgf´cm, 14 ft´lbf)
(d) Connect the PCV hose to the PCV valve on the RH cylin-
der head.
(e) Connect the ground strap and cable to the intake air con-
trol valve for the ACIS.
(f) Connect the ground cable and strap with the nut.
Torque: 14.5 N´m (145 kgf´cm, 10 ft´lbf)
(g) Connect the ground cable to the air intake chamber.
(h) Connect the brake booster vacuum hose to the throttle
body.
(i) Connect the 2 water bypass hoses to the throttle body.
(j) Connect the air assist hose to the throttle body.
(k) Connect the purge hose to the emission control valve set.
(l) Connect the 2 vacuum hoses to the vacuum tank for
ACIS.
(m) Connect the engine wire clamp to the emission control
valve set.

A07505
(p)
(q)
(r)(o)
(n)
(m)
(n)
A09695
Throttle Body
Bracket
Engine
Hanger
A09699
8 mm Hexagon Wrench
A05074(b) (c)
EM-32
- ENGINE MECHANICALCYLINDER HEAD
1016 Author
: Date
:
2001 AVALON (RM808U)
(m) Disconnect the brake booster vacuum hose from the
throttle body.
(n) Disconnect the 2 water bypass hoses from the throttle
body.
(o) Disconnect the air assist hose from the throttle body.
(p) Disconnect the purge hose from the pipe on the emission
control valve set.
(q) Disconnect the 2 vacuum hoses from the vacuum tank for
the ACIS.
(r) Disconnect the engine wire clamp from the emission con-
trol valve set.
(s) Remove the 2 bolts and No.1 engine hanger.
(t) Remove the 2 bolts and throttle body bracket.
(u) Using an 8 mm hexagon wrench, remove the 2 bolts, 2
nuts, the air intake chamber assembly and gasket.
9. REMOVE INTAKE MANIFOLD ASSEMBLY
(a) Disconnect the 6 injector connectors.
(b) Disconnect the fuel inlet hose from the fuel filter.
CAUTION:
Perform connecting operations of the fuel tube connector
(quick type) after observing the precautions.
(See page SF-1)
(c) Disconnect the heater hose from the intake manifold.

S04497
A07300
- ENGINE MECHANICALENGINE UNIT
EM-79
1063 Author
: Date
:
2001 AVALON (RM808U)
15. CONNECT ENGINE WIRE TO CABIN
(a) Push in the engine wire through the cowl panel. Install the
grommet.
(b) Connect the 5 engine ECM connectors.
(c) Install the glove compartment.
16. CONNECT CONNECTORS, CABLE, CLAMPS AND
HOSES
(a) Connect the noise filter connector on the LH fender
apron.
(b) Connect the generator connector and wire.
(c) Connect the starter connector and wire.
(d) Connect the 2 ground strap connectors to the RH fender
apron
(e) Connect the strap connector to the LH fender apron with
the bolt.
(f) Connect the ground cable to the battery body bracket.
(g) Connect the engine wire protector clamp to the battery
body bracket.
(h) Connect the engine wire clamp to the bracket on the RH
fender apron.
(i) Connect the brake booster vacuum hose to the throttle
body.
(j) Connect the engine coolant reservoir hose to the water
outlet.
(k) Connect the heater hose to the intake manifold.
(l) Connect the heater hose to the water inlet housing.
(m) Connect the fuel inlet hose to the fuel filter.
CAUTION:
Perform connecting operations of the fuel tube connector
(quick type) after observing the precautions.
(See page SF-1)
(n) Connect the EVAP hose assembly to the pipe on the
emission control valve set.
(o) Connect the 2 vacuum hoses to the vacuum tank for the
ACIS.
17. INSTALL FRONT EXHAUST PIPE
(a) Temporarily install 3 new gaskets and the front exhaust
pipe with the 2 bolts, 2 compression springs and 4 nuts.
(b) Tighten the 4 nuts holding the exhaust manifolds to the
front exhaust pipe.
Torque: 62 N´m (630 kgf´cm, 46 ft´lbf)
(c) Tighten the 2 bolts and 2 compression springs holding the
front exhaust pipe to the center exhaust pipe.
Torque: 43 N´m (440 kgf´cm, 32 ft´lbf)

EM0ZL-02
A10518
5 mm
Hexagon
Wrench
A07300
EM-72
- ENGINE MECHANICALENGINE UNIT
1056 Author
: Date
:
2001 AVALON (RM808U)
REMOVAL
1. REMOVE BATTERY AND TRAY
2. REMOVE HOOD
3. REMOVE ENGINE FENDER APRON SEALS
4. DRAIN ENGINE COOLANT
5. DRAIN ENGINE OIL
6. 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.
7. DISCONNECT ACCELERATOR CABLE
8. REMOVE AIR CLEANER CAP ASSEMBLY AND AIR
CLEANER CASE
9. REMOVE CRUISE CONTROL ACTUATOR
10. REMOVE RADIATOR (See page CO-17)
11. REMOVE FRONT EXHAUST PIPE
(a) Remove the 2 bolts holding the support stay to the sup-
port bracket.
(b) Remove the 2 bolts and 2 compression springs holding
the front exhaust pipe to the center exhaust pipe.
(c) Remove the 4 nuts holding the front exhaust pipe to the
exhaust manifolds.
(d) Remove the front exhaust pipe and 3 gaskets.
12. DISCONNECT CONNECTORS, CABLE, CLAMPS AND
HOSES
(a) Remove the bolt and disconnect the ground strap from
the LH fender apron.
(b) Disconnect the 2 ground strap connectors from the RH
fender apron.
(c) Disconnect the ground cable from the A/T.
(d) Disconnect the engine wire protector clamp from the bat-
tery body bracket.
(e) Disconnect the engine wire clamp from the bracket on the
RH fender apron.
(f) Disconnect the brake booster vacuum hose from the
throttle body.
(g) Disconnect the engine coolant reservoir hose from the
water outlet.
(h) Disconnect the heater hose from the intake manifold.
(i) Disconnect the heater hose from the water inlet housing.

B02389
B02390
HEAT METHOD: When the problem seems to occur when the suspect area is heated. 2
NOTICE:3 WATER SPRINKLING METHOD:
(1)
(2)
4 OTHER: When a malfunction seems to occur when electrical load is excessive.When the malfunction seems to occur on a rainy day or in a
high-humidity condition. Heat the component that is the likely cause of the malfunction
with a hair dryer or similar object. Check to see if the malfunction
occurs.
Sprinkle water onto the vehicle and check to see if the malfunc-
tion occurs.
Turn on all electrical loads including the heater blower, head
lights, rear window defogger, etc. and check to see if the mal-
function occurs.ON HINT:
If a vehicle is subject to water leakage, the leaked water may
contaminate the ECU. When testing a vehicle with a water leak-
age problem, special caution must be taken.
Malfunc-
tion
Do not heat to more than 60 °C (140 °F). (Temperature
is limited not to damage the components.)
Do not apply heat directly to parts in the ECU. (1)
(2)
Never sprinkle water directly into the engine compart-
ment, but indirectly change the temperature and hu-
midity by applying water spray onto the radiator front
surface.
Never apply water directly onto the electronic compo-
nents. NOTICE:
- INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMSIN-25
25 Author
: Date
:
2001 AVALON (RM808U)