TOYOTA AVENSIS 2003 Service Repair Manual

A60552
30
20
105
3
2
1
0.5
0.3
0.2
0.1
RESISTANCE k
±20 0 20 40 60 80 100 (±4)
TEMPERATURE
C(
F)
(32) (68) (104)(140)(176)(212)
A65174
Ohmmeter
A60553
±
ENGINE CONTROL SYSTEM SFI SYSTEM (1ZZ±FE/3ZZ±FE)
10±5
AVENSIS REPAIR MANUAL (RM1018E)
5. INSPECT ENGINE COOLANT TEMPERA TURE
SENSOR
(a) Resistance inspection.
(1) Using an ohmmeter, measure the resistance be-tween terminals.
Resistance:
2.32 to 2.59 k at 20
C (68
F)
0.310 to 0.326 k at 80
C (176
F)
NOTICE:
In case of checking the water temperature sensor in the wa-
ter, be careful not to allow water to go into the terminals,
and after checking, wipe out the sensor.
6. INSPECT KNOCK SENSOR
(a) Using an ohmmeter, measure the resistance between ter- minals.
Resistance: 120 to 280 k at 20
C (68
F)
HINT:
If the resistance is not specified, replace the sensor.
7. INSPECT EFI RELAY
(a) Inspect the relay continuity. (1) Using an ohmmeter, check that there is continuity
between terminals 1 and 2.
Specified condition: Continuity
(2) Check that there is no continuity between terminals 3 and 5.
Specified condition: No continuity
(b) Inspect the relay operation. (1) Apply battery voltage across terminals 1 and 2.
(2) Using an ohmmeter, check that there is continuitybetween terminals 3 and 5.
Specified condition: Continuity
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A60553
10±6
±
ENGINE CONTROL SYSTEM SFI SYSTEM (1ZZ±FE/3ZZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
8. INSPECT CIRCUIT OPENING RELAY
(a) Inspect the relay continuity. (1) Using an ohmmeter, check that there is continuity
between terminals 1 and 2.
Specified condition: Continuity
(2) Check that there is no continuity between terminals 3 and 5.
Specified condition: No continuity
(b) Inspect the relay operation. (1) Apply battery voltage across terminals 1 and 2.
(2) Using an ohmmeter, check that there is continuitybetween terminals 3 and 5.
Specified condition: Continuity
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100EX±02
A75903
Air
A79035
VG
EVG
A79035
E2
EMPS
±
ENGINE CONTROL SYSTEMSFI SYSTEM(1ZZ±FE/3ZZ±FE)
10±1
AVENSIS REPAIR MANUAL (RM1018E)
SFI SYSTEM(1ZZ±FE/3ZZ±FE)
ON±VEHICLE INSPECTION
1.INSPECTMASS AIR FLOW METER
(a)If you have hand±held tester:
Inspect for operation
(1)Connect the hand±held tester to the DLC3.
(2)Turn the ignition switch ON.
(3)Blow air into the MAF meter, and check that the airflow fluctuates (MAF) of the ºDIAGNOSIS / OBD/
MOBD / DATA LIST / ALLº shown the standard val-
ue.
If operation is not as specified, check the MAF meter (See page
10±3), wiring and ECM.
(b)If you have no hand±held tester: Inspect for operation
(1)Turn the ignition switch ON.
(2)Connect the positive tester probe of the voltmeterto the terminal VG of the ECM. and the negative tes-
ter probe of the voltmeter to the terminal EVG of the
ECM.
(3)Blow air into the MAF meter, and check that the volt- age fluctuates.
If operation is not as specified, check the MAF meter (See page
10±3), wiring and ECM.
2. INSPECT POWER STEERING OIL PRESSURE SWITCH
(a) Using a voltmeter, measure the voltage between termi-
nals EMPS and E2.
Voltage:
ConditionVoltage (V)
Not spin the steering wheel at engine idling8 to 14
Spin the steering wheel at engine idling0 to 1.5
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A60620
Close
Open
Valve
VaIve
Open
Close
Valve
1ZZ±FE:
3ZZ±FE: VaIve
10±2
±
ENGINE CONTROL SYSTEM SFI SYSTEM (1ZZ±FE/3ZZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
3. INSPECT IDLE AIR CONTROL VALVE
NOTICE:

It is impossible to check the resister value and the op-
eration of ISCV by itself, because the ISCV has an IC
circuit inside it, which transforms the duty signal
from the ECM to the derive signal.

Clear the DTC after inspection.
HINT:
When the ISCV system has malfunctions except for its adher-
ence, DTC P0505 is detected.
(a) Operation inspection. (1) Connect the ISCV connector to the ISCV.
(2) Check the valve movement when the ignition switch
is turned ON.
Movement:
Half open fully close  fully open  half open
HINT:
ISCV moves within 0.5 second.
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100FG±01
A77870
Mass Air Flow
Meter Connector
N´m (kgf´cm, ft´lbf) : Specified torqueEngine Cover Sub±assy
No. 1
7.0 (71, 62 in.

lbf)
Fuel Vapor Feed Hose
No. 2
Air Cleaner Cap
Sub±assy VSV
Connector
Fuel Vapor Feed Hose
Clip
Engine Room Cover Side
Radiator Support Opening Cover
Clip Retainer
x2
x4
10±24
±
ENGINE CONTROL SYSTEM THROTTLE BODY ASSY (1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
THROTTLE BODY ASSY (1AZ±FE)
COMPONENTS
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A77871
Non±reusable part
N´m (kgf´cm, ft´lbf) : Specified torque ISC Valve

ISC Valve Gasket
Fuel Vapor Feed HoseThrottle Position Sensor
Accelerator Control Cable
Assy
Throttle Body Gasket
Water By±pass Hose No. 2Water By±pass Hose Fuel Tube Sub±assy
Fuel Pipe Support
Throttle Position Sensor
Connector
ISC Valve Connector
13 (129, 9)30 (306, 22)
Throttle Body Assy
±
ENGINE CONTROL SYSTEM THROTTLE BODY ASSY (1AZ±FE)
10±25
AVENSIS REPAIR MANUAL (RM1018E)
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100FH±01
A778975 Claws
A77902
A77872
10±26
±
ENGINE CONTROL SYSTEMTHROTTLE BODY ASSY(1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
Removal & Installation and Disassembly & Reassembly
1.REMOVE ENGINE ROOM COVER SIDE
(a)Remove the retainer and 4 clips.
(b)Unfasten the 5 claws and remove the radiator support opening cover.
2.REMOVE RADIATOR SUPPORT OPENING COVER
(a)Remove the 2 clips, and then remove the engine room cover side.
3.DRAIN ENGINE COOLANT (See page 16±19)
4. REMOVE ENGINE COVER SUB±ASSY NO.1
(a) Remove the 2 nuts, and then remove the engine cover No. 1.
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A77873
(a)
(c)
(b)
(d)
(h)
(i)
(g)
(g)
(f)
(e)
Air cleaner clamp
(c)
A77874
±
ENGINE CONTROL SYSTEM THROTTLE BODY ASSY (1AZ±FE)
10±27
AVENSIS REPAIR MANUAL (RM1018E)
5. REMOVE AIR CLEANER CAP SUB±ASSY
(a) Disconnect the mass air flow meter connector.
(b) Disconnect the VSV connector.
(c) Remove the 2 wire harness clamps.
(d) Disconnect the ventilation hose.
(e) Disconnect the fuel vapor feed hose No. 1.
(f) Disconnect the fuel vapor feed hose N0. 2.
(g) Remove the fuel vapor feed hose No. 2 from 2 clamps of
the air cleaner hose.
(h) Lock the hose clamp as shown in the illustration.
(i) Raise the air cleaner clamp up, slide it to the air cleaner cap.
(j) Remove the air cleaner cap together with air cleaner hose No. 1.
6. SEPARATE ACCELERATOR CONTROL CABLE ASSY
(a) Loosen the nut and separate the accelerator control cable.
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A77875
(a)
(b)
(c)
(d)
(e)
A81619
A77876
A77877
A77878
10±28
±
ENGINE CONTROL SYSTEM THROTTLE BODY ASSY (1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
7. REMOVE THROTTLE BODY ASSY
(a) Disconnect the throttle position sensor connector.
(b) Disconnect the ISC valve connector.
(c) Disconnect the water by±pass hose No. 2.
(d) Disconnect the water by±pass hose.
(e) Remove the fuel tube from the fuel pipe support.
(f) Remove the 3 bolts, and then remove the fuel pipe sup- port and the throttle body.
(g) Remove the gasket from the intake manifold.
8. REMOVE FUEL VAPOR FEED HOSE NO.2
(a) Remove the fuel vapor feed hose No. 2 from the throttle body.
9. REMOVE ISC VALVE
(a) Remove the 3 screws, and then remove the ISC valve.
(b) Remove the gasket from the throttle body.
10. REMOVE THROTTLE POSITION SENSOR
(a) Remove the 2 screws, and then remove the throttle posi- tion sensor.
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A77879
45

A77880
83.8 mm
(3.299 in.)
Rotation
Center of
Throttle Link
±
ENGINE CONTROL SYSTEMTHROTTLE BODY ASSY(1AZ±FE)
10±29
AVENSIS REPAIR MANUAL (RM1018E)
11.INSTALL THROTTLE POSITION SENSOR
(a)Make sure that throttle valve is fully closed.
(b)With the throttle position sensor rotated 45
counter-
clockwise about the fully closed position of the throttle
valve, install the throttle position sensor to the throttle
body.
(c)Rotate the throttle position sensor clockwise and secure
it with the 2 screws.
12.INSTALL ISC VALVE
(a)Install a new gasket to the throttle body.
(b)Install the ISC valve with the 3 screws.
13.INSTALL FUEL VAPOR FEED HOSE NO.2
14.INSTALL THROTTLE BODY ASSY
(a)Install a new gasket to the intake manifold.
(b)Install the throttle body and the fuel pipe support with the 3 bolts.
Torque: 30 N
m (306 kgf
cm, 22 ft
lbf)
(c)Install the fuel tube to the fuel pipe support.
(d)Connect the water by±pass hose.
(e)Connect the water by±pass hose No. 2.
(f)Connect the ISC valve connector.
(g)Connect the throttle position sensor connector.
15.INSTALL ACCELERATOR CONTROL CABLE ASSY
(a)Instal the accelerator control cable as shown in the il- lustration.
Torque: 13 N
m (129 kgf
cm, 9 ft
lbf)
16.INSTALL AIR CLEANER CAP SUB±ASSY
17.INSTALL ENGINE COVER SUB±ASSY NO.1 Torque: 7.0 N
m (71 kgf
cm, 62 in.
lbf)
18.ADD ENGINE COOLANT (See page 16±19)
19.CHECK FOR ENGINE COOLANT LEAKS (See page 16±13)
20. INSTALL ENGINE ROOM COVER SIDE
21. INSTALL RADIATOR SUPPORT OPENING COVER
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