TOYOTA AVENSIS 2005 Service Repair Manual

A83861
Engine Coolant
Temperature SensorECM
E2
THW
E2
A76786
Wire Harness Side:
Engine Coolant Temperature
Sensor Connector
E2
Front View
A83862
ECM Engine Coolant
Temperature Sensor
E2
THW
E2
A76903
THW
E2
E13ECM Connector
05−72
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
AVENSIS Supplement (RM1045E)
2 READ VALUE OF HAND−HELD TESTER(CHECK FOR OPEN IN HARNESS)
(a) Disconnect the E2 engine coolant temperature sensor
connector.
(b) Connect terminals 1 and 2 of the engine coolant tempera-
ture sensor wire harness side connector.
(c) Connect the hand−held tester to the DLC3.
(d) Turn the ignition switch to ON.
(e) Turn the hand−held tester ON.
(f) On the hand−held tester, select the item: DIAGNOSIS /
OBD/MOBD / DATA LIST / ALL / COOLANT TEMP.
(g) Read the values.
Temperature value:140
C (284
F) or more
(h) Reconnect the engine coolant temperature sensor con-
nector.
OK CONFIRM GOOD CONNECTION AT SENSOR. IF
OK, REPLACE ENGINE COOLANT
TEPMERATURE SENSOR
NG
3 READ VALUE OF HAND−HELD TESTER(CHECK FOR OPEN IN ECM)
(a) Disconnect the E2 engine coolant temperature sensor
connector.
(b) Connect terminals THW and E2 of the E13 ECM connec-
tor.
HINT:
Before checking, do a visual and contact pressure check on the
ECM connector.
(c) Connect the hand−held tester to the DLC3.
(d) Turn the ignition switch to ON.
(e) Turn the hand−held tester ON.
(f) On the hand−held tester, select the item: DIAGNOSIS /
OBD/MOBD / DATA LIST / ALL / COOLANT TEMP.
(g) Read the values.
Temperature value:140
C (284
F) or more
(h) Reconnect the engine coolant temperature sensor con-
nector.
OK REPAIR OR REPLACE HARNESS OR
CONNECTOR
NG
CONFIRM GOOD CONNECTION AT ECM. IF OK, REPLACE ECM
(See page10−65 of Pub. No. RM1018E AVENSIS)

A83863
ECM Engine Coolant
Temperature Sensor
E2
THW
E2
A83863
ECM Engine Coolant
Temperature Sensor
E2
THW
E2
A81699
E13
ECM Connector
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
05−73
AVENSIS Supplement (RM1045E)
4 READ VALUE OF HAND−HELD TESTER(CHECK FOR SHORT IN HARNESS)
(a) Disconnect the E2 engine coolant temperature sensor
connector.
(b) Connect the hand−held tester to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the hand−held tester ON.
(e) On the hand−held tester, select the item: DIAGNOSIS /
OBD/MOBD / DATA LIST / ALL / COOLANT TEMP.
(f) Read the values.
Temperature value:−40
C(−40
F)
(g) Reconnect the engine coolant temperature sensor con-
nector.
OK REPLACE ENGINE COOLANT TEMPERATURE
SENSOR
NG
5 READ VALUE OF HAND−HELD TESTER(CHECK FOR SHORT IN ECM)
(a) Disconnect the E13 ECM connector.
(b) Disconnect the E2 engine coolant temperature sensor
connector.
(c) Connect the hand−held tester to the DLC3.
(d) Turn the ignition switch to ON.
(e) Turn the hand−held tester ON.
(f) On the hand−held tester, select the item: DIAGNOSIS /
OBD/MOBD / DATA LIST / ALL / COOLANT TEMP.
(g) Read the values.
Temperature:−40
C(−40
F)
(h) Reconnect the ECM connector.
(i) Reconnect the engine coolant temperature sensor con-
nector.
OK REPAIR OR REPLACE HARNESS OR
CONNECTOR
NG
REPLACE ECM (See page10−65 of Pub. No. RM1018E AVENSIS)

−20 0 20 40 60 80100
(−4) 32 68104140176 212 30
20
10
5
3
2
1
0.5
0.3
0.2
0.1
A67628
Acceptable (Figure1)
Resistance K

Temperature_C(_F)
05−66
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
AVENSIS Supplement (RM1045E)
DTC P0110 INTAKE AIR TEMPERATURE CIRCUIT
DTC P0112 INTAKE AIR TEMPERATURE CIRCUIT LOW
INPUT
DTC P0113 INTAKE AIR TEMPERATURE CIRCUIT HIGH
INPUT
CIRCUIT DESCRIPTION
The intake air temperature (IAT) sensor, mounted on the mass
air flow (MAF) meter, monitors the intake air temperature. The
IAT sensor has a thermistor that varies its resistance depending
on the temperature of the intake air. When the air temperature
is low, the resistance in the thermistor increases. When the tem-
perature is high, the resistance drops. The variations in resis-
tance are reflected as voltage changes to the ECM terminal.
(See Figure1).
The intake air temperature sensor is connected to the ECM.
The 5 V power source voltage in the ECM is applied to the in-
take air temperature sensor from terminal THA (THAR) via re-
sistor R.
That is, the resistor R and the intake air temperature sensor are
connected in series. When the resistance value of the intake air
temperature sensor changes in accordance with changes in the
intake air temperature, the voltage at terminal THA (THAR) also
changes. Based on this signal, the ECM increases the fuel in-
jection volume to improve the driveability during cold engine op-
eration.
DTC No.Proceed toDTC Detection ConditionTrouble Area
P0110Step1
Open or short in intake air
temperature sensor circuit
for 0.5 secondSOpen or short in intake air temperature sensor circuit
SIntake air temperature sensor (built in mass air flow meter)
SECM
P0112Step 4
Short in intake air tempera-
ture sensor circuit for 0.5 se-
condSShort in intake air temperature sensor circuit
SIntake air temperature sensor (built in mass air flow meter)
SECM
P0113Step 2
Open in intake air tempera-
ture sensor circuit for 0.5 se-
condSOpen in intake air temperature sensor circuit
SIntake air temperature sensor (built in mass air flow meter)
SECM
HINT:
After confirming DTC P0110, P0112orP0113, use the hand−held tester to confirm the intake air temperature
DIAGNOSIS / OBD/MOBD / DATA LIST / ALL.
Temperature DisplayedMalfunction
−40˚C(−40˚F)Open circuit
140˚C(284˚F) or moreShort circuit
05CJG−02

A72925
BR
GR
28
20
E 13 THA
E2 ECM
5 4
A6
Intake Air Temperature Sensor
(Built in Mass Air Flow Meter)
E13 5V
R
THA
E2 E1
−
DIAGNOSTICS SFI SYSTEM (2AZ−FSE)
05 −67
AVENSIS Supplement (RM 1045E)
WIRING DIAGRAM
INSPECTION PROCEDURE
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.
1 READ VALUE OF HAND −HELD TESTER(INTAKE AIR TEMPERATURE)
(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, selsct the item: DIAGNOSIS / OBD/MOBD / DATA LIST / ALL / INTAKE AIR.
(d) Read the values.
Temperature: Same value as the ambient air temperature
Result:
DisplayProceed to
−40 ˚ C( −40 ˚F )A
140 ˚ C (284 ˚F ) or moreB
OK (Same as ambient air temperature)C
HINT:
S If there is an open circuit, the hand −held tester indicates −40 ˚C( −40 ˚F).
SIf there is a short circuit, the hand −held tester indicates 140 ˚C (284 ˚F) or more.
B Go to step 4
C CHECK FOR INTERMITTENT PROBLEMS (See Page 05 −7)
A

A83861
ECM Mass Air Flow
Meter Connector
A6
THA
E2
A54396
E2THA Wire Harness Side:
Mass Air Flow Meter Connector
A6Front View
A83862
ECM Mass Air Flow
Meter Connector
A6
THA
E2
A76903
THA
E2
E13ECM Connector
05−68
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
AVENSIS Supplement (RM1045E)
2 READ VALUE OF HAND−HELD TESTER(CHECK FOR OPEN IN HARNESS)
(a) Disconnect the A6 mass air flow meter connector.
(b) Connect terminals THA and E2 of the mass air flow meter
wire harness side connector.
(c) Connect the hand−held tester to the DLC3.
(d) Turn the ignition switch to ON.
(e) Turn the hand−held tester ON.
(f) On the hand−held tester, select the item: DIAGNOSIS /
OBD/MOBD / DATA LIST / ALL / INTAKE AIR.
(g) Read the values.
Temperature value:140
C (284
F) or more
(h) Reconnect the mass air flow meter connector.
OK CONFIRM GOOD CONNECTION AT SENSOR. IF
OK, REPLACE MASS AIR FLOW METER
NG
3 READ VALUE OF HAND−HELD TESTER(CHECK FOR OPEN IN ECM)
(a) Disconnect the A6 mass air flow meter connector.
(b) Connect terminals THA and E2 of the E13 ECM connec-
tor.
HINT:
Before checking, do a visual and contact pressure check on the
ECM connector.
(c) Connect the hand−held tester to the DLC3.
(d) Turn the ignition switch to ON.
(e) Turn the hand−held tester ON.
(f) On the hand−held tester, selset the item: DIAGNOSIS /
OBD/MOBD / DATA LIST / ALL / INTAKE AIR.
(g) Read the values.
Temperature value:140
C (284
F) or more
(h) Reconnect the mass air flow meter connector.
OK REPAIR OR REPLACE HARNESS OR
CONNECTOR
NG
CONFIRM GOOD CONNECTION AT ECM. IF OK, REPLACE ECM
(See page10−65 of Pub. No. RM1018E AVENSIS)

A83863
ECM Mass Air Flow
Meter Connector
A6
THA
E2
A83864
ECM Mass Air Flow
Meter Connector
A6
THA
E2
A81699
E13
ECM Connector
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
05−69
AVENSIS Supplement (RM1045E)
4 READ VALUE OF HAND−HELD TESTER(CHECK FOR SHORT IN HARNESS)
(a) Disconnect the A6 mass air flow meter connector.
(b) Connect the hand−held tester to the DLC3.
(c) Turn the ignition switch to ON.
(d) Turn the hand−held tester ON.
(e) On the hand−held tester, select the item: DIAGNOSIS /
MOBD / DATA LIST / ALL / INTAKE AIR.
(f) Read the values.
Temperature value:−40
C(−40
F)
(g) Reconnect the mass air flow meter connector.
OK REPLACE MASS AIR FLOW METER
NG
5 READ VALUE OF HAND−HELD TESTER(CHECK FOR SHORT IN ECM)
(a) Disconnect the E13 ECM connector.
(b) Disconnect the A6 mass air flow meter connector.
(c) Connect the hand−held tester to the DLC3.
(d) Turn the ignition switch to ON.
(e) Turn the hand−held tester ON.
(f) On the hand−held tester, select the item: DIAGNOSIS /
OBD/MOBD / DATA LIST / ALL / INTAKE AIR.
(g) Read the values.
Temperature value:−40
C(−40
F)
(h) Reconnect the ECM connector.
(i) Reconnect the mass air flow meter connector.
OK REPAIR OR REPLACE HARNESS OR
CONNECTOR
NG
REPLACE ECM (See page10−65 of Pub. No. RM1018E AVENSIS)

A01512
(V)
(3.96)
3.6
2.4
1.2
150 450
750(840)mmHg
kPa
20 60 100(112)
Manifold Absolute PressureOutput Voltage
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
05−61
AVENSIS Supplement (RM1045E)
DTC P0105 MANIFOLD ABSOLUTE
PRESSURE/BAROMETRIC PRESSURE
CIRCUIT
DTC P0107 MANIFOLD ABSOLUTE
PRESSURE/BAROMETRIC PRESSURE
CIRCUIT LOW INPUT
DTC P0108 MANIFOLD ABSOLUTE
PRESSURE/BAROMETRIC PRESSURE
CIRCUIT HIGH INPUT
CIRCUIT DESCRIPTION
By a built−in sensor unit, the manifold absolute pressure sensor
detects the intake manifold pressure as a voltage. The ECM
then determines the basic injection duration and basic ignition
advance angle based on this voltage.
Since the manifold absolute pressure sensor does not use the
atmospheric pressure as a standard, but senses the absolute
pressure inside the intake manifold (the pressure in proportion
to the preset absolute vacuum 0), it is not influenced by fluctua-
tions in the atmospheric pressure due to high altitude and other
factors. This permits it to control the air−fuel ratio at the proper
level under all conditions.
If the ECM detects the DTC P0105, P0107 or P0108, it operates
the fail−safe function, keeping the ignition timing and fuel injec-
tion volume constant and making it possible to drive the vehicle.
DTC No.DTC Detection ConditionTrouble Area
P0105Open or short in manifold absolute pressure sensor circuit for
0.5 second or moreSOpen or short in manifold absolute pressure sensor circuit
SManifold absolute pressure sensor
SECM
P0107Open in manifold absolute pressure sensor circuit for 0.5 se-
cond or moreSOpen or short in manifold absolute pressure sensor circuit
SManifold absolute pressure sensor
SECM
P0108Short in manifold absolute pressure sensor circuit for 0.5 se-
cond or moreSOpen or short in manifold absolute pressure sensor circuit
SManifold absolute pressure sensor
SECM
HINT:
After confirming DTC P0105, P0107 or P0108, use the hand−held tester to confirm the manifold absolute
pressure in DIAGNOSIS / OBD/MOBD / DATA LIST / ALL.
Manifold Absolute Pressure (kPa)Malfunction
Approximately 0SPIM circuit short
142 or more
SVC circuit open or short
SPIM circuit open
SE2 circuit open
05CJF−02

A00309
V1
Manifold Absolute Pressure Sensor18
E13 ECM
5V
E1
1 R
−W
33
G −W
2 3
BR 28
E2 PIM VC
VOUT
GND E13
E13
VCC
05
−62
−
DIAGNOSTICS SFI SYSTEM (2AZ−FSE)
AVENSIS Supplement (RM1045E)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
S If DTCs related to different systems that have terminal E2 as the ground terminal are output simulta-
neously, 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.
1 READ VALUE OF HAND −HELD TESTER(INTAKE MANIFOLD ABSOLUTE
PRESSURE)
(a) Connect the hand −held tester to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the hand −held tester ON.
(d) On the hand −held tester, select the item: DIAGNOSIS / OBD/MOBD / DATA LIST / ALL / MAP.
(e) Read the values.
Pressure: Same as the atmospheric pressure
Result:
Manifold Absolute Pressure (kPa)Proceed to
142 or moreA
0.0B
OK (Same as actual atmospheric pressure) (*1)C
*1: The value must be changed when the engine is run or stopped.
B Go to step 3
C CHECK FOR INTERMITTENT PROBLEMS(See Page 05 −7)
A

123
A85679
V1
VCC (+)
GND (−) Manifold Absolute Pressure Sensor
Connector Wire Harness Side:
Front View
A76903
PIM (+)E2 (−)
ECM Connector
E13
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
05−63
AVENSIS Supplement (RM1045E)
2 INSPECT MANIFOLD ABSOLUTE PRESSURE SENSOR(VCC VOLTAGE)
(a) Disconnect the V1 manifold absolute pressure sensor
connector.
(b) Turn the ignition switch to ON.
(c) Measure the voltage between the specified terminals of
the V1 manifold absolute pressure sensor connector.
Standard:
Tester ConnectionSpecified Condition
VCC (V1−3)−GND (V1−1)4.5 to 5.5 V
NG Go to step 4
OK
3 INSPECT ECM(PIM VOLTAGE)
(a) Turn the ignition switch to ON.
(b) Measure the voltage between the specified terminals of
the E13 ECM connector.
Standard:
Tester ConnectionSpecified Condition
PIM (E13−33)−E2 (E13−28)3.4 to 3.8 V
NG Go to step 5
OK
REPLACE ECM (See page10−65 of Pub. No. RM1018E AVENSIS)

A81699
VC
E13
ECM Connector
123
A85679
VCC Manifold Absolute Pressure Sensor
Connector Wire Harness Side:
V1
Front View
05−64
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
AVENSIS Supplement (RM1045E)
4 CHECK HARNESS AND CONNECTOR(ECM−MANIFOLD ABSOLUTE PRESSURE
SENSOR)
(a) Disconnect the E13 ECM connector.
(b) Disconnect the V1 manifold absolute pressure sensor
connector.
(c) Check the resistance between the wire harness side con-
nectors.
Standard (Check for open):
Tester ConnectionSpecified Condition
VC (E13−18)−VCC (V1−3)Below 1

Standard (Check for short):
Tester ConnectionSpecified Condition
VC (E13−18) or VCC (V1−3)−Body ground10 k
or higher
(d) Reconnect the ECM connector.
(e) Reconnect the manifold absolute pressure sensor con-
nector.
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
REPLACE ECM (See page10−65 of Pub. No. RM1018E AVENSIS)