2005 TOYOTA AVENSIS Circuit

+25 %
−12.5 %
More than 0.5 V
Less than 0.4V
Case1
Case 2
Case 3
Case 4
Output voltage of heated oxygen
sensor (sensor1: front sensor)
Injection volume
Output voltage
Output voltage of heated oxygen
sensor (sensor 2: rear sensor)Main suspect
trouble area
OK
+25 %
−12.5 %
More than 0.5 V
Less than 0.4V
Injection volume
Output voltage
+25 %
−12.5 %
More than 0.5 V
Less than 0.4V
Injection volume
Output voltage
Sensor1: front sensor
(sensor1, heater, sensor1
circuit)+25 %
−12.5 %
More than 0.5 V
Less than 0.4V
Injection volume
Output voltage
+25 %
−12.5 %
Injection volume
Output voltage
NG
+25 %
−12.5 %
Injection volume
Output voltage
NG
+25 %
−12.5 %
Injection volume
Output voltage
NG
+25 %
−12.5 %
Injection volume
Output voltage
NGExtremely rich or lean actual
air−fuel ratio
(Injector, fuel pressure, gas
leakage in exhaust system,
etc.) OK
OK
OK
Almost no reaction


Sensor 2: rear sensor
(sensor 2, heater, sensor 2
circuit)
Almost no reaction Almost no reactionAlmost no reaction
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
05−87
AVENSIS Supplement (RM1045E)
INSPECTION PROCEDURE
HINT:
Hand−held tester only:
It is possible the malfunctioning area can be found using the ACTIVE TEST A/F CONTROL operation. The
A/F CONTROL operation can determine if the A/F sensor, heated oxygen sensor or other potential trouble
areas are malfunctioning or not.
(a) Perform the ACTIVE TEST A/F CONTROL operation.
HINT:
The A/F CONTROL operation lowers the injection volume12.5% or increases the injection volume 25%.
(1) Connect the hand−held tester to the DLC3 on the vehicle.
(2) Turn the ignition switch to ON.
(3) Warm up the engine by running the engine at 2,500 rpm for approximately 3 minutes.
(4) Select the item: DIAGNOSIS / OBD/MOBD / ACTIVE TEST / A/F CONTROL.
(5) Perform the A/F CONTROL operation with the engine in an idle condition (press the right or left
button).
Result:
Heated oxygen sensor reacts in accordance with increase and decrease of injection volume:
+25 %
rich output: More than 0.5 V
−12.5 %
lean output: Less than 0.4 V
NOTICE:
There is a delay of few seconds in the sensor1(front sensor) output, and there is about 20 seconds
delay at maximum in the sensor 2 (rear sensor).

05−88
−
DIAGNOSTICS SFI SYSTEM (2AZ−FSE)
AVENSIS Supplement (RM 1045E)
The following A/F CONTROL procedure enables the technician to check and graph the voltage outputs of
both the heated oxygen sensor.
To display the graph, enter ACTIVE TEST/ A/F CONTROL/USER DATA, then select ”O2S B 1S 1 and O2S
B 1S2” or ”O2S B2S 1 and O2S B2S2” by pressing the ”YES” button followed by the ”ENTER” button and then
the ”F4” button.
NOTICE:
If the vehicle is short of fuel, the air −fuel ratio becomes LEAN and heated oxygen sensor DTCs will
be recorded, and the CHK ENG then illuminates.
HINT:
S If different DTCs related to different systems that have terminal E2 as the ground terminal are output
simultaneously, terminal E2 may have an open circuit.
S Read freeze frame data using the hand−held tester . Freeze frame data records the engine conditions
when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the
vehicle was running or stopped, if the engine was warmed up or not, if the air −fuel ratio was lean or
rich, and other data from the time the malfunction occurred.
S A high heated oxygen sensor (sensor 1) voltage (0.5 V or more) could be caused by a rich air −fuel
mixture. Check for conditions that would cause the engine to run rich.
S A low heated oxygen sensor (sensor 1) voltage (0.4 V or less) could be caused by a lean air −fuel mix-
ture. Check for conditions that would cause the engine to run lean.
1 CHECK OTHER DTC OUTPUT(IN ADDITION TO HEATED OXYGEN SENSOR
DTCS)
(a) Connect the hand −held tester to the DLC3.
(b) Turn the ignition switch to ON and turn the hand −held tester ON.
(c) Select the item: DIAGNOSIS / OBD/MOBD / DTC INFO / CURRENT CODES.
(d) Read the DTCs using the hand −held tester.
Result:
Display (DTC output)Proceed to
P0 130, P0 150, P2 195, P2 196, P2 197 and/or P2 198A
P0 130, P0 150, P2 195, P2 196, P2 197 or P2 198 and other DTCsB
HINT:
If any other codes besides P0 130, P0 150, P2 195, P2 196, P2 197 and/or P2 198 are output, perform trouble-
shooting for those DTCs first.
B GO TO RELEVANT DTC CHART(See page 05 −31)
A

− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
05−75
AVENSIS Supplement (RM1045E)
DTC P0120 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ”A” CIRCUIT
DTC P0122 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ”A” CIRCUIT LOW INPUT
DTC P0123 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ”A” CIRCUIT HIGH INPUT
DTC P0220 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ”B” CIRCUIT
DTC P0222 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ”B” CIRCUIT LOW INPUT
DTC P0223 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ”B” CIRCUIT HIGH INPUT
DTC P2135 THROTTLE/PEDAL POSITION
SENSOR/SWITCH ”A”/”B” VOLTAGE
CORRELATION
HINT:
This is the purpose of troubleshooting on the throttle position sensor.
05CK7−02

A19755A19802
Throttle Position Sensor ECM
Magnet
Magnet
IC No.2 IC No.1
VC
VTA1
E2 VTA2Throttle Position Sensor Output Voltage (V)
Fail Safe Angle
*1
Usable Range
Throttle Valve Opening Angle (deg)84 6.5
0 5
2.58
2.25
0.95
0.69
*1:
VTA1 VTA2
Throttle Valve Fully Opened
(Throttle Position expressed as percentage
(VTA1)64to96%)
Fail Safe Angle 7˚
(Throttle Position expressed as percentage
(VTA1) about10to16%) Throttle Valve Fully Closed
(Throttle Position expressed as percentage
(VTA1)10to24%) 05−76
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
AVENSIS Supplement (RM1045E)
CIRCUIT DESCRIPTION
HINT:
SThis Electrical Throttle Control System (ETCS) does not use a throttle cable.
SThis throttle position sensor uses 2 hall ICs.
The throttle position sensor is mounted on the throttle body and it detects the opening angle of the throttle
valve. This sensor is electronically controlled and uses Hall−effect elements, so that accurate control and
reliability can be obtained. The throttle position sensor has 2 sensor elements / 2 signal output: VTA1and
VTA2. VTA1used to detect the throttle opening angle and VTA2 is used to detect malfunctions in VTA1. Volt-
age applied to VTA1and VTA2 change between 0V and 5V in proportion to the opening angle of the throttle
valve. There are several checks that the ECM performs to confirm proper operation of the throttle position
sensor and VTA1.
The ECM judges the current opening angle of the throttle valve from these signals input from terminals VTA1
and VTA2, and the ECM controls the throttle motor to make the throttle valve angle properly in response to
driver inputs.

− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
05−77
AVENSIS Supplement (RM1045E) DTC No.
DTC Detection Condition
Condition (a) of DTC P0120, P0122, P0123, P0220, P0222 or P0223 continues
for 2 seconds
(Open or short in the throttle position sensor circuit)Trouble Area
P0120
Detection conditions for DTCs P0122 and P0123 are not satis-
fied but condition (a) is satisfied
(a) VTA1is ”0.2 V or less” or ”4.8 V or more”SThrottle position sensor (built in throttle body)
SECM
P0122(a) VTA1is 0.2 V or less
SThrottle position sensor (built in throttle body)
SShort in VTA1circuit
SOpen in VC circuit
SECM
P0123(a) VTA1is 4.8 V or more
SThrottle position sensor (built in throttle body)
SOpen in VTA1circuit
SOpen in E2 circuit
SVC and VTA1circuits are short−circuited
SECM
P0220
Detection conditions for DTCs P0222 and P0223 are not satis-
fied but condition (a) is satisfied
(a) VTA2 is ”0.5 V or less” or ”4.8 V or more” and
VTA1is ”0.2 V or more” and ”1.8 V or less”
SThrottle position sensor (built in throttle body)
SECM
P0222(a) VTA2 is 0.5 V or less
SThrottle position sensor (built in throttle body)
SShort in VTA2 circuit
SOpen in VC circuit
SECM
P0223(a) VTA2 is ”4.8 V or more” and
VTA1is ”0.2 V or more” or ”1.8 V or less”
SThrottle position sensor (built in throttle body)
SOpen in VTA2 circuit
SOpen in E2 circuit
SVC and VTA2 circuits are short−circuited
SECM
P2135
Condition (a) continues for 0.5 second or more, or
condition (b) continues for 0.4 second or more:
(a) Difference between VTA1and VTA2 is 0.02 V or less
(b) VTA1is ”0.2 V or less” and VTA2 is ”0.5 V or less”SVTA1and VTA2 circuits are short−circuited
SThrottle position sensor (built in throttle body)
SECM
NOTICE:
When a malfunction is detected, the throttle valve is locked at a certain opening angle. Also, the
whole electronically controlled throttle operation is cancelled until the system returns to normal and
the ignition switch is turned OFF.
HINT:
SAfter confirming DTCs, use the hand−held tester to confirm the throttle valve opening percentage and
closed throttle position switch condition.
SThe THROTTLE POS means VTA1signal as well as the THROTTLE POS #2 for the VTA2 signal.
Reference (Normal condition):
Tester displayAccelerator pedal fully releasedAccelerator pedal fully depressed
THROTTLE POS10to24%64 to 96 %
THROTTLE POS #22.1to 3.1V4.5 to 5.5 V

A76871
T1
Throttle Position Sensor
(Built in Throttle Body)ECM
6 5
4
3L−W
B−R
BRE13 R−W
VTA1
E2 VTA2VC
2831 21 18
VTA1
E2 VTA2VC
E13
E13
E13 05−78
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
AVENSIS Supplement (RM1045E)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
SIf different DTCs related to different systems that have terminal E2 as the ground terminal are output
simultaneously, terminal E2 may have an open circuit.
SRead freeze frame data usingthe hand−held tester. Freeze frame data records the engine conditions
when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the
vehicle was running or stopped, if the engine was warmed up or not, if the air−fuel ratio was lean or
rich, and other data from the time the malfunction occurred.

B53781
Throttle Body Connector
VC VTA2VTA1
E2 Wire Harness Side:
T1
Front View
A81699ECM Connector E13
VC
VTA1VTA2
E2
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
05−79
AVENSIS Supplement (RM1045E)
1READ VALUE OF HAND−HELD TESTER(THROTTLE POS AND THROTTLE POS
#2)
(a) Connect the hand−held tester to the DLC3.
(b) Turn the ignition switch to ON and turn the hand−held tester ON.
(c) On the hand−held tester, select the items: DIAGNOSIS / OBD/MOBD / DATA LIST / ETCS /
THROTTLE POS and THROTTLE POS #2.
(d) Read the values.
Result:
Throttle position expressed as percentage and voltage
Accelerator pedal releasedAccelerator pedal depressedTroubleareaProceedtoTHROTTLE POS
(VTA1)THROTTLE POS #2
(VTA2)THROTTLE POS
(VTA1)THROTTLE POS #2
(VTA2)Trouble areaProceed to
0%0 to 0.2 V0%0 to 0.2 VVC circuit open
100 %4.5 to 5.5 V100 %4.5 to 5.5 VE2 circuit open
0%or100 %2.1to 3.1V
(Fail safe)0%or100 %2.1to 3.1V
(Fail safe)VTA1circuit open or
ground shortA
About16%
(Fail safe)0 to 0.2 or 4.5 to 5.5 VAbout16%
(Fail safe)0 to 0.2 or 4.5 to 5.5 VVTA2 circuit open or
ground short
10to24%2.1to 3.1V64 to 96 %
(Does not fail safe)4.5 to 5.5 V
(Does not fail safe)Throttle position sen-
sor circuit is normalB
B Go to step 5
A
2 CHECK HARNESS AND CONNECTOR(THROTTLE POSITION SENSOR−ECM)
(a) Disconnect the T1throttle body connector.
(b) Disconnect the E13 ECM connector.
(c) Check the resistance between the wire harness side con-
nectors.
Standard (Check for open):
Tester ConnectionSpecified Condition
VC (T1−5)−VC (E13−18)Below1

VTA1(T1−6)−VTA1(E13−21)Below1

VTA2 (T1−4)−VTA2 (E13−31)Below1

E2 (T1−3)−E2 (E13−28)Below1

Standard (Check for short):
Tester ConnectionSpecified Condition
VC (T1−5) or VC (E13−18)−Body ground10k
or higher
VTA1(T1−6) or VTA1(E13−21)−Body ground10k
or higher
VTA2 (T1−4) or VTA2 (E13−31)−Body ground10k
or higher
(d) Reconnect the ECM connector.
(e) Reconnect the throttle body connector.
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK

05−74
−
DIAGNOSTICS SFI SYSTEM (2AZ−FSE)
AVENSIS Supplement (RM 1045E)
DTC P0 11 6 ENGINE COOLANT TEMPERATURE CIRCUIT
RANGE/PERFORMANCE PROBLEM
CIRCUIT DESCRIPTION
Refer to DTC P0 11 5 on page 05 −70.
DTC No.DTC Detection ConditionTrouble Area
P0 116
(1 ) With the engine coolant temperature was −40 ˚C( −40 ˚F) or
more but less than 60 ˚C( 140 ˚F) when the engine was started,
and if conditions (a) and (b) are met:
(a) Vehicle has accelerated and decelerated.
(b) Engine coolant temperature remains within 3 ˚C (5.4 ˚F) of
the initial engine coolant temperature (2 trip detection logic)
(2) If the engine coolant temperature is more than 60 ˚C
( 1 40 ˚F) when the engine is started and the vehicle has accel-
erated and decelerated
(3) If the engine coolant temperature sensor records a temper-
ature variation below 1˚C( 1.8 ˚F) successively 6 times (6 trip
detection logic)
S Engine coolant temperature sensor
INSPECTION PROCEDURE
HINT:
SIf DTCs related to different systems that have terminal E2 as the ground terminal are output simulta-
neously, terminal E2 may have an open circuit.
SRead freeze frame data using the hand−held tester . Freeze frame data records the engine conditions
when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the
vehicle was running or stopped, if the engine was warmed up or not, if the air −fuel ratio was lean or
rich, and other data from the time the malfunction occurred.
1 REPLACE ENGINE COOLANT TEMPERATURE SENSOR
05CK2 −02