2003 TOYOTA AVENSIS check engine

100G7±02
321
45
±20
020 40 60
80100
0.1
0.2 0.3 0.5 1 2
35
10
20 30
TEMPERATURE
C(
F)
RESISTANCE k

(±4) (32) (80) (140)(104) (212)
(176)
Air
E2THAVG
E2G +B
A50378
12
Valve
A50377
B09641
10±20
±
ENGINE CONTROL SYSTEM SFI SYSTEM (1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION
1. INSPECT MASS AIR FLOW METER
(a) Output voltage inspection. (1) Apply battery voltage across terminals 1 (+B) and 2(E2G).
(2) Using a voltmeter, connect the positive (+) tester probe to terminal 3 (VG), and negative (±) tester
probe to terminal 2 (E2G).
(3) Blow air into the MAF meter, and check that the volt- age fluctuates.
(b) Resistance inspection. (1) Using an ohmmeter, measure the resistance be-
tween terminals 4 (THA) and 5 (E2).
Resistance:
TerminalsResistanceTemperature
THA ± E213.6 to 18.4 k
±20
C (±4
F)
THA ± E22.21 to 2.69 k
20
C (68
F)
THA ± E20.49 to 0.67 k
60
C (140
F)
2. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE
ASSY
(a) Resistance inspection. (1) Using an ohmmeter, measure the resistance be-
tween the terminals.
Resistance: 6.9 to 7.9
at 20
C (68
F)
(b) Movement inspection. (1) Connect the positive (+) lead from the battery to ter-minal 1 and negative (±) lead to terminal 2, and
check the movement of the valve.
NOTICE:
Confirm the valve does not adhere.
HINT:
Bad returning of the valve by entrance of foreign objects causes
subtle pressure leak to the advanced direction. Then, DTC can
be detected.
3. INSPECT THROTTLE BODY ASSY
(a) Check throttle body. (1) Check that throttle valve shaft is not rickety.
(2) Check that each port is not stopped up.
(3) Check that throttle valve opens and closes smooth-
ly.
(4) Check that there is no clearance between the
throttle stop screw and throttle lever when the
closed throttle position.
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VTA E2 VC
A35493
±
ENGINE CONTROL SYSTEM SFI SYSTEM (1AZ±FE)
10±21
AVENSIS REPAIR MANUAL (RM1018E)
(b) Adjust the throttle stop screw.
NOTICE:
The throttle stop screw adjusting is very, so adjust it only
when the adjusting is really needed.
(1) Loosen the locknut and loosen the screw until it de-taches the lever.
(2) Confirm that the throttle vale is fully closed.
(3) After the screw touches the lever, tighten it by 1/4
revolution additionally and tighten the lock nut.
(4) Seal the lock nut with yellow paint.
(5) Check that the throttle position sensor operates normally.
4. INSPECT THROTTLE POSITION SENSOR
(a) Resistance inspection. (1) Disconnect the throttle position sensor connector.
(2) Using an ohmmeter, measure the resistance be-tween terminals VC and E2.
Resistance: 2.5 to 5.0 k

(3) Check the change of resistance between terminals VTA and E2.
Change of resistance:
The resistance value increases in proportion to the
throttle lever opening value.
HINT:
Throttle valveResistance
Fully close0.2 to 5.7 k

Fully open2.0 to 10.2 k

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TEMPERATURE
C(
F)
RESISTANCE k
30
20
10
5
2
1
0.5
0.3
0.2
0.1 3
±20 0 20 40 60 80 100
(±4) (32) (80) (140)(104)
(212)
(176)
A50371
A65174
Ohmmeter
E34090
10±22
±
ENGINE CONTROL SYSTEM SFI SYSTEM (1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
5. INSPECT ENGINE COOLANT TEMPERA TURE
SENSOR
(a) Resistance inspection.
(1) Using an ohmmeter, measure the resistance be-tween each terminal.
Resistance:
Approx. 20
C (68
F) 2.32 to 2.59k
Approx. 80
C (176
F) 0.310 to 0.326k 
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 continuitybetween 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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E34090
±
ENGINE CONTROL SYSTEM SFI SYSTEM (1AZ±FE)
10±23
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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100G6±02
A75903
Air
A79035
VG
EVG
A79035E2
PSW
10±18
±
ENGINE CONTROL SYSTEMSFI SYSTEM(1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
SFI SYSTEM(1AZ±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±20), 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±20), wiring and ECM.
2. INSPECT POWER STEERING OIL PRESSURE SEN- SOR
(a) Using a voltmeter, measure the voltage between termi-
nals PSW and E2.
Voltage:
ConditionVoltage (V)
Not spin the steering wheel at engine idling9 to 14
Spin the steering wheel at engine idling0 to 3
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CloseOpen
Valve
Valve
B09650
±
ENGINE CONTROL SYSTEM SFI SYSTEM (1AZ±FE)
10±19
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.

After checking, erase the DTC.

Clear the DTC after inspection.
HINT:
When the ISCV system has malfunctions except for its adher-
ence, DTC P0511 is detected.
(a) Operation inspection. (1) Connect the ISC valve connector to the ISC valve.
(2) Check the ISC valve movement when the ignitionswitch is turned ON.
Movement:
Half open fully close  fully open  half open
HINT:
ISC valve moves within 0.5 second.
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100G9±02
321
45
±20
020 40 60
80100
0.1
0.2 0.3 0.5 1 2
35
10
20 30
TEMPERATURE
C(
F)
RESISTANCE k

(±4) (32) (80) (140)(104) (212)
(176)
Air
E2THAVG
E2G +B
A50378
12
Valve
A50377
A59778
M±
M+
±
ENGINE CONTROL SYSTEM SFI SYSTEM (1AZ±FSE)
10±39
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION
1. INSPECT MASS AIR FLOW METER
(a) Output voltage inspection.
(1) Apply battery voltage across terminals 1 (+B) and 2(E2G).
(2) Using a voltmeter, connect the positive (+) tester probe to terminal 3 (VG), and negative (±) tester
probe to terminal 2 (E2G).
(3) Blow air into the MAF meter, and check that the volt- age fluctuates.
(b) Resistance inspection. (1) Using an ohmmeter, measure the resistance be-
tween terminals 4 (THA) and 5 (E2).
Resistance:
TerminalsResistanceTemperature
THA ± E213.6 to 18.4 k
±20
C (±4
F)
THA ± E22.21 to 2.69 k
20
C (68
F)
THA ± E20.49 to 0.67 k
60
C (140
F)
2. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE
ASSY
(a) Resistance inspection. (1) Using an ohmmeter, measure the resistance be-
tween the terminals.
Resistance: 6.9 to 7.9
at 20
C (68
F)
(b) Movement inspection. (1) Connect the positive (+) lead from the battery to ter-minal 1 and negative (±) lead to terminal 2, and
check the movement of the valve.
NOTICE:
Confirm the valve does not adhere.
HINT:
Bad returning of the valve by entrance of foreign objects causes
subtle pressure leak to the advanced direction. Then, DTC can
be detected.
3. INSPECT THROTTLE BODY ASSY
(a) Using an ohmmeter, measure the resistance between the terminals.
Resistance:
Terminal No.Resistance
2 (M+) ± 1 (M±)0.3 to 100
at 20
C (68
F)
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TEMPERATURE
C(
F)
RESISTANCE k
30
20
10
5
2
1
0.5
0.3
0.2
0.1 3
±20 0 20 40 60 80 100
(±4) (32) (80) (140)(104)
(212)
(176)
A50371
A65174
Ohmmeter
E34090
10±40
±
ENGINE CONTROL SYSTEM SFI SYSTEM (1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
4. INSPECT ENGINE COOLANT TEMPERA TURE
SENSOR
(a) Resistance inspection.
(1) Using an ohmmeter, measure the resistance be-tween each terminal.
Resistance:
Approx. 20
C (68
F) 2.32 to 2.59k
Approx. 80
C (176
F) 0.310 to 0.326k 
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.
5. 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.
6. INSPECT EFI RELAY
(a) Inspect the relay continuity.
(1) Using an ohmmeter, check that there is continuitybetween 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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