2001 TOYOTA AVALON engine coolant

DI-4
- DIAGNOSTICSENGINE
160 Author
: Date
:
2001 AVALON (RM808U)

The diagnosis system operates in normal mode
during normal vehicle use. It also has a check mode
for technicians to simulate malfunction symptoms
and troubleshoot. Most DTC use 2 trip detection
logic* to prevent erroneous detection, and ensure
thorough malfunction detection. By switching the
ECM to check mode when troubleshooting, the
technician can cause the MIL to light up for a mal-
function that is only detected once or momentarily
(TOYOTA hand-held tester only). (See step 2)

*2 trip detection logic:
When a malfunction is first detected, the malfunc-
tion is temporarily stored in the ECM memory. (1st
trip)
If the same malfunction is detected again during the second
drive test, this second detection causes the MIL to light up. (2nd
trip) the 2 trip repeats the same mode a 2nd time (However, the
ignition switch must be turned OFF between the 1st trip and 2nd
trip.).

Freeze frame data:
Freeze frame data records the engine condition
when a misfire (DTCs P0300 - P0306) or fuel trim
malfunction (DTCs P0171 and P0172) or other mal-
function (first malfunction only), is detected. Be-
cause freeze frame data records the engine condi-
tions (fuel system, calculated load, engine coolant
temperature, fuel trim, engine speed, vehicle
speed, etc.) when the malfunction is detected.
When troubleshooting, it is useful for determining
whether the vehicle was running or stopped, the en-
gine was warmed up or not, the air-fuel ratio was
lean or rich, etc. at the time of the malfunction.
Priorities for troubleshooting:
If troubleshooting priorities for multiple DTCs are given in the
applicable DTC chart, these should be followed.
If no instructions are given, troubleshoot DTCs according to the
following priorities.
(1) DTC other than fuel trim malfunction (DTCs P0171
and P0172), and misfire (DTCs P0300 - P0306).
(2) Fuel trim malfunction (DTCs P0171 and P0172).
(3) Misfire (DTCs P0300 - P0306).

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?

B04941
- DIAGNOSTICSENGINE
DI-1 1
167 Author
: Date
:
2001 AVALON (RM808U)
OK
8 Check for spark.
PREPARATION:
(a) Remove the ignition coil from the spark plug.
(b) Remove the spark plug.
(c) Install the spark plug to the ignition coil.
(d) Disconnect the injector connector.
(e) Be sure to ground the screw of the spark plug securely.
CHECK:
Check if spark occurs while the engine is being cranked.
NOTICE:

Do not crash the electrode gap.

To prevent excess fuel being injected from the injec-
tors during this test, don't crank the engine for more
than 5 - 10 seconds at a time.
NG Proceed to page IG-1, and continue to trouble-
shoot.
OK
Proceed to problem symptoms table on page
DI-22.
7. ENGINE OPERATING CONDITION
NOTICE:
The values given below for ºNormal Conditionº are representative values, so a vehicle may still be
normal even if its value varies differ from those listed here. So do not decide whether a part is faulty
or not solely according to the ºNormal Conditionº here.
(a) CARB mandated signals.
TOYOTA hand-held tester displayMeasurement ItemNormal Condition*
FUEL SYS #1
Fuel System Bank 1
OPEN: Air-fuel ratio feedback stopped
CLOSED: Air-fuel ratio feedback operating
Idling after warming up: CLOSED
FUEL SYS #2
Fuel System Bank 2
OPEN: Air-fuel ratio feedback stopped
CLOSED: Air-fuel ratio feedback operating
Idling after warming up: CLOSED
CALC LOADCalculator Load: Current intake air volume as a
proportion of max. intake air volumeIdling: 13.1 - 18.7 %
Racing without load (2,500rpm): 11.7 - 17.3 %
COOLANT TEMPEngine Coolant Temp. Sensor ValueAfter warming up: 80 - 95°C (176 - 203°F)
SHORT FT #1Short-term Fuel Trim Bank 10 ± 20 %
LONG FT #1Long-term Fuel Trim Bank 10 ± 20 %

DI4DE-02
A02016
E6 E8E7
31 30 29 28 2717
19 20 21
22 23 24 25 2611 12
13 141 2 3 4 5 6 7 8 9
10
ECM Terminals
15 16
181 2 3 4 5 6 7
8 9 10 11 12 13 14 15 16
188
20 21 22 23 2417
191 2 3 4 5 6
7 9 10 11 12
13 14 15 16 171 2 3 4 5 6 7 8 9
10 12 11 13 14 15 16 17 18 19
20 21 23 22 24 26 25 27
281 2 3 4 5 6 7
8 9 10 11 12 13 14 15
16 17 18 19 20 21 22
E5 E4 DI-20
- DIAGNOSTICSENGINE
176 Author
: Date
:
2001 AVALON (RM808U)
TERMINALS OF ECM
Symbols (Terminal No.)Wiring ColorConditionSTD Voltage (V)
BATT (E8-1) - E1 (E5-17)B-R eBRAlways9 - 14
+B (E8-16) - E1 (E5-17)B-W e BRIG switch ON9 - 14
VC (E5-2) - E2 (E5-18)L-R e WIG switch ON4.5 - 5.5
VTA1 (E5 23) E2 (E5 18)LGWIG switch ON, Throttle valve fully closed0.3 - 1.0VTA1 (E5-23) - E2 (E5-18)LGe WIG switch ON, Throttle valve fully open2.7 - 5.2
VG (E5-10) - E2G (E5-19)R eR-BIdling, A/C switch OFF1.1 - 1.5
VV1+ (E4-10)
- NE- (E5-24)B-W eL
IdliPulse generation
VV2+ (E4-22)
- NE- (E5-24)B-W eL
IdlingPulse generation
(See page DI-124)
NE+ (E5-16) - NE- (E5-24)B-W eLIdlingPulse generation
(See page DI-124)
OC1+ (E4-6) - OC1- (E4-5)R-B e RPl tiOC2+ (E4-29)
- OC2- (E4-18)R-L eR-WIG switch ONPulse generation
(See page DI-127)
THA (E5-22) - E2 (E5-18)L-B eWIdling, Intake air temp. 20°C (68°F)0.5 - 3.4
THW (E5-14) - E2 (E5-18)G-Y eWIdling, Engine coolant temp. 80°C (176°F)0.2 - 1.0
STA (E8-7) - E1 (E5-17)B-R e BRCranking6.0 or more
#10 (E5-5) - E01 (E4-21)
#20 (E5-6) - E01 (E4-21)
#30 (E4 1) E01 (E4 21)
L eW-B
R eW-B
YWB
IG switch ON9 - 14
#30 (E4-1) - E01 (E4-21)
#40 (E4-2) - E01 (E4-21)
#50 (E4-3) - E01 (E4-21)
#60 (E4-4) - E01 (E4-21)Y eW-B
W eW-B
G eW-B
G eW-B
IdlingPulse generation
(See page DI-58)
IGT1 (E4-11) - E1 (E5-17)GR eBR
IGT2 (E4-12) - E1 (E5-17)B-R eBR
IGT3 (E4-13) - E1 (E5-17)LG-B eBRIdliPulse generation
IGT4 (E4-14) - E1 (E5-17)L-Y eBRIdlingPulse generation
(See page DI-1 17)
IGT5 (E4-15) - E1 (E5-17)L eBR
(g )
IGT6 (E4-16) - E1 (E5-17)LG eBR
IG switch ON4.5 - 5.5
IGF (E4-25) - E1 (E5-17)B-Y eBRIdlingPulse generation
(See page DI-1 17)
ACIS (E8-17) - E01 (E4-21)R-Y eW-BIG it h ON914ACI1 (E5-15) - E01 (E4-21)W-R eW-BIG switch ON9 - 14
FC (E8 3) E01 (E4 21)GBWBIG switch ON9 - 14FC (E8-3) - E01 (E4-21)G-B eW-BIdling0 - 3.0

EM04B-04
A10521
Knock Sensor Connector
Engine Wire Band
Engine WireKnock Sensor
Water Inlet Housing
(With Water Inlet)
No.2 Idler Pulley Bracket
Water Seal Plate
Engine Coolant
Drain Union
Oil Filter Union
Oil Filter  Gasket
Cylinder Block
Side Cover
 Gasket
Water Pump
 Crankshaft
Front Oil Seal
Crankshaft
Position Sensor
Connector
Oil Pressure
Switch
Oil Pressure Switch
Connector
A/C Compressor
Housing Bracket
No.1 Oil Pan
x 17 Oil Pump
 Gasket
 Gasket
Engine WireGenerator
Drain Plugx 10No.2 Oil Pan Oil Strainer
 Non-reusable part
N´m (kgf´cm, ft´lbf): Specified torque
Precoated part

8 (80, 69 in.´lbf)
8 (80, 69 in.´lbf)
10 mm Head 8 (80, 69 in.´lbf)
12 mm Head 19.5 (200, 14)
10 mm Head 8 (80, 69 in.´lbf)
12 mm Head 19.5 (200, 14)
45 (460, 33)
8 (80, 69 in.´lbf)
9 (90, 78 in.´lbf)
x 8
8 (80, 69 in.´lbf)
28 (290, 21)


18 (180, 13)
25 (250, 18)
39 (400, 29)
No.2 ECT Switch
Connector
 O-Ring
x 9
19.5 (200, 14)
- ENGINE MECHANICALCYLINDER BLOCK
EM-81
1065 Author
: Date
:
2001 AVALON (RM808U)
CYLINDER BLOCK
COMPONENTS

P12389
SST
A05253
P18763
WaterSeal
Plate
Oil Filter
Union
12 mm
Hexagon
Wrench
Coolant
Drain
Union
A02010
P12508
EM-84
- ENGINE MECHANICALCYLINDER BLOCK
1068 Author
: Date
:
2001 AVALON (RM808U)
13. REMOVE KNOCK SENSORS
(a) Disconnect the 2 knock sensor connectors.
(b) Using SST, remove the 2 knock sensors.
SST 09816-30010
14. REMOVE WATER INLET HOUSING
(a) Remove the engine wire band.
(b) Disconnect the engine wire clamp from the bracket.
(c) Remove the 8 bolts, 2 nuts and water inlet housing.
15. REMOVE WATER PUMP (See page CO-6)
16. REMOVE NO.2 OIL PAN (See page LU-9)
17. REMOVE OIL STRAINER (See page LU-3)
18. REMOVE NO.1 OIL PAN (See page LU-3)
19. REMOVE OIL PUMP (See page LU-9)
20. REMOVE OIL FILTER (See page LU-3)
21. REMOVE OIL FILTER UNION
Using a 12 mm hexagon wrench, remove the oil filter union.
22. REMOVE WATER SEAL PLATE
Remove the 2 nuts and seal plate.
23. REMOVE ENGINE COOLANT DRAIN UNION
24. REMOVE CYLINDER BLOCK SIDE COVER
Remove the 3 bolts, 2 nuts, cylinder block side cover and gas-
ket.
25. REMOVE REAR OIL SEAL RETAINER
(a) Remove the 6 bolts.
(b) Using a screwdriver, remove the oil seal retainer by prying
the portions between the oil seal retainer and main bear-
ing cap.

P12477
Seal Packing
Z09223
Seal Width
3 - 5 mmA
BA
B
- ENGINE MECHANICALCYLINDER BLOCK
EM-107
1091 Author
: Date
:
2001 AVALON (RM808U)
17. INSTALL ENGINE COOLANT DRAIN UNION
(a) Apply seal packing to 2 or 3 threads.
Seal packing: Part No. 08826-00100 or equivalent
(b) Install the drain union.
Torque: 39 N´m (400 kgf´cm, 29 ft´lbf)
HINT:
After applying the specified torque, rotate the drain union clock-
wise until its drain port is facing downward.
18. INSTALL WATER SEAL PLATE
(a) Remove any old packing (FIPG) material and be careful
not to drop any oil on the contact surfaces of the seal plate
and cylinder block.

Using a razor blade and gasket scraper, remove all
the old packing (FIPG) material from the gasket sur-
faces and sealing groove.

Thoroughly clean all components to remove all the
loose material.

Using a non-residue solvent, clean both sealing
surfaces.
(b) Apply seal packing to the seal plate as shown in the il-
lustration.
Seal packing: Part No. 08826-00100 or equivalent

Install a nozzle that has been cut to a 3 - 5 mm (0.12
- 0.20 in.) opening.

Parts must be assembled within 3 minutes of ap-
plication. Otherwise the material must be removed
and reapplied.

Immediately remove nozzle from the tube and rein-
stall cap.
(c) Install the seal plate with the 2 nuts.
Torque: 18 N´m (180 kgf´cm, 13 ft´lbf)
19. INSTALL OIL FILTER UNION
Torque: 30 N´m (310 kgf´cm, 22 ft´lbf)
20. INSTALL OIL FILTER (See page LU-3)
21. INSTALL OIL PUMP (See page LU-15)
22. INSTALL NO.1 OIL PAN (See page LU-15)
23. INSTALL OIL STRAINER (See page LU-15)
24. INSTALL NO.2 OIL PAN (See page LU-15)
25. INSTALL WATER PUMP (See page CO-8)
26. INSTALL WATER INLET HOUSING
(a) Remove any old packing (FIPG) material and be careful
not to drop any oil on the contact surfaces of the water in-
let housing and cylinder block.

Using a razor blade and gasket scraper, remove all
the old packing (FIPG) material from the gasket sur-
faces and sealing grooves.

Thoroughly clean all components to remove all the
loose material.

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)