2005 TOYOTA AVENSIS Circuit

A72925
ECM
THW
E2 19
E13
28
E13 BR B−W
1 2 E2
Engine Coolant Temperature Sensor
5V
R
E1 05−70
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
AVENSIS Supplement (RM1045E)
DTC P0115 ENGINE COOLANT TEMPERATURE CIRCUIT
DTC P0117 ENGINE COOLANT TEMPERATURE CIRCUIT
LOW INPUT
DTC P0118 ENGINE COOLANT TEMPERATURE CIRCUIT
HIGH INPUT
CIRCUIT DESCRIPTION
A thermistor is built in the engine coolant temperature sensor and changes the resistance value according
to the engine coolant temperature.
The structure of the sensor and connection to the ECM is the same as those of the intake air temperature
sensor.
HINT:
If the ECM detects the DTC P0115, P0117 or P0118, it operates the fail−safe function in which the engine
coolant temperature is assumed to be 80_C (176_F).
DTC No.Proceed toDTC Detection ConditionTrouble Area
P0115Step 1
Open or short in engine cool-
ant temperature sensor cir-
cuit for 0.5 secondSOpen or short in engine coolant temperature sensor circuit
SEngine coolant temperature sensor
SECM
P0117Step 4
Short in engine coolant tem-
perature sensor circuit for
0.5 secondSShort in engine coolant temperature sensor circuit
SEngine coolant temperature sensor
SECM
P0118Step 2
Open in engine coolant tem-
perature sensor circuit for
0.5 secondSOpen in engine coolant temperature sensor circuit
SEngine coolant temperature sensor
SECM
HINT:
After confirming DTC P0115, P0117 or P0118, use the hand−held tester to confirm the engine coolant tem-
perature in DIAGNOSIS / OBD/MOBD / DATA LIST / ALL.
Temperature DisplayedMalfunction
−40˚C(−40˚F)Open circuit
140˚C(284˚F) or moreShort circuit
WIRING DIAGRAM
05CJH−02

−
DIAGNOSTICS SFI SYSTEM (2AZ−FSE)
05 −71
AVENSIS Supplement (RM1045E)
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(ENGINE COOLANT 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, select the item: DIAGNOSIS / OBD/MOBD / DATA LIST / ALL / COOLANT
TEMP.
(d) Read the values. Temperature: 80 to 95 _C( 176 to 203 _F) after warming up
Result:
DisplayProceed to
− 40 ˚ C( −40 ˚F )A
140 ˚ C (284 ˚F ) or moreB
OK (Same as actual engine coolant 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

−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

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

A80089
AB B+
Power Transistor
Platinum Hot Wire
(Heater)
Output
Voltage
Temperature
sensor
Platinum Hot Wire (Heater)
Temperature sensor
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
05−55
AVENSIS Supplement (RM1045E)
DTC P0100 MASS OR VOLUME AIR FLOW CIRCUIT
DTC P0102 MASS OR VOLUME AIR FLOW CIRCUIT
LOW INPUT
DTC P0103 MASS OR VOLUME AIR FLOW CIRCUIT
HIGH INPUT
CIRCUIT DESCRIPTION
The MAF (Mass Air Flow) meter measures the amount of air flowing through the throttle valve. The ECM uses
this information to determine the fuel injection time and provide a proper air−fuel ratio. Inside the MAF meter,
there is a heated platinum wire exposed to the flow of intake air.
By applying a specific current to the wire, the ECM heats this wire to a given temperature. The flow of incom-
ing air cools the wire and an internal thermistor, changing their resistance. To maintain a constant current
value, the ECM varies the voltage applied to these components in the MAF meter. The voltage level is pro-
portional to the airflow through the sensor and the ECM interprets this voltage as the intake air amount.
The circuit is constructed so that the platinum hot wire and temperature sensor provide a bridge circuit, with
the power transistor controlled so that the potential of A and B remains equal to maintain the set temperature.
DTC No.DTC Detection ConditionTrouble Area
P0100Open or short in mass air flow meter circuit for more than 3
seconds at engine speed of 4,000 rpm or lessSOpen or short in mass air flow meter circuit
SMass air flow meter
SECM
P0102Open or short in mass air flow meter circuit for more than 3
seconds at engine speed of 4,000 rpm or less
SOpen in mass air flow meter circuit
SShort in ground circuit
SMass air flow meter
SECM
P0103
Open in mass air flow meter circuit for more than 3 seconds
(EVG circuit) at engine speed of 4,000 rpm or less
Short in mass air flow meter circuit for more than 3 seconds
(+B circuit) at engine speed of 4,000 rpm or lessSOpen in mass air flow meter circuit (EVG circuit)
SShort in mass air flow meter circuit (+B circuit)
SMass air flow meter
SECM
05CJE−02

A76863
B−Y
Battery FL MAINEngine Room R/B No. 4
L−Y EFI Relay
A6
Mass Air Flow MeterMREL
B−G 4B 1
W−BB−W 53
2
1
29
E13 8
E9ECM
EFI No. 2
EC 4A 1
Engine Room
J/B No. 4 1A 1
B−G 1 2
EFI 1
Engine Room
R/B No.1and
Engine Room
J/B No.14
4
44
4
4
2
1 W−B
B−W
B−WGR
GRIE1 2
EVG 30
E13VG
G 1
3
2 EA1 13 05−56
− DIAGNOSTICSSFI SYSTEM (2AZ−FSE)
AVENSIS Supplement (RM1045E)
HINT:
After confirming DTC P0100, P0102 or P0103, use the hand−held tester to confirm the air flow rate from the
DIAGNOSIS / OBD/MOBD / DATA LIST / ALL.
Air flow rate (gm/s)Malfunction
Approximately 0.0SMass air flow meter power source circuit open
SVG circuit open or short
271.0 or moreSEVG circuit open
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Read 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.