TOYOTA AVENSIS 2005 Service Repair Manual

05±210
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
4READ OUTPUT DTC(THROTTLE POSITION SENSOR DTCS ARE OUTPUT AGAIN)
(a)Clear the DTC (See page 05±149).
(b) Start the engine.
(c) Run the engine at idle for more than 15 seconds.
(d)Read the DTC (See page 05±149). Result:
Display (DTC output)Proceed to
ºP0120/41, P0122/41 or P0123/41º is output againA
ºP0120/41, P0122/41 or P0123/41º is not output againB
B SYSTEM OK
A
CHECK AND REPLACE ECM (See page 01±32)

A72925
ECM
THW
E2 19
E13
28
E13 BR B±W
1 25V
R E2
Engine Coolant Temperature Sensor
± DIAGNOSTICSSFI SYSTEM (1AZ±FE)
05±199
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0115/22 ENGINE COOLANT TEMPERATURE CIRCUIT
DTC P0117/22 ENGINE COOLANT TEMPERATURE CIRCUIT
LOW INPUT
DTC P0118/22 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 ºP0115/22, P0117/22 or P0118/22º it enters the fail±safe mode in which the en-
gine coolant temperature is assumed to be 80 C (176 F).
DTC No.Proceed toDTC Detection ConditionTrouble Area
P0115/22Step 1
Open or short in engine cool-
ant temp. sensor circuit for
0.5 sec.

Open or short in engine coolant temperature sensor circuit
P0117/22Step 4Short in engine coolant temp.
sensor circuit for 0.5 sec.

Open or short in engine coolant temperature sensor circuit

Engine coolant temperature sensor

ECM
P0118/22Step 2Open in engine coolant temp.
sensor circuit for 0.5 sec.
HINT:
After confirming DTC ºP0115/22, P0117/22 or P0118/22º, use the hand±held tester to confirm the engine
coolant temperature in the ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALLº.
Temperature DisplayedMalfunction
±40 C (±40 F)Open circuit
140  (284   Short circuit
WIRING DIAGRAM
05C6V±01

05±200
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
HINT:

If different DTCs that are related to a different system are output simultaneously while terminal E2 is
used as a ground terminal, terminal E2 may be open.

Read freeze frame data using
\b\b
\b 
\f
 Freeze frame data records the engine conditions
when a malfunction is detected. When troubleshooting, it is useful for d\
etermining whether the vehicle
was running or stopped, the engine was warmed up or not, the air±fuel ra\
tio was lean or rich, etc. at
the time of the malfunction.
When using hand±held tester:
1READ VALUE OF HAND±HELD TESTER(ENGINE COOLANT TEMPERATURE)
(a)Connect the hand±held tester to the DLC3.
(b)Turn the ignition switch ON and push the hand±held tester main switch \
ON.
(c)Select the item ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALL / COOLANT TEMPº and read its value displayed on the hand±held tester.
Temperature: Same value as the actual intake air temperature.
Result:
Temperature DisplayedProceed to
±40C (±40 )A
140 C (284 ) or moreB
OK (Same as present temperature)C
HINT:

If there is an open circuit, the hand±held tester indicates ±40 C (±40 F).

If there is a short circuit, the hand±held tester indicates 140 C (284 F) or more.
BGo to step 4
CCHECK FOR INTERMITTENT PROBLEMS (See page 05±149)
A

A75743
ECM
Engine Coolant
Temperature Sensor
A76786
Wire Harness Side
E2
Engine Coolant Temperature
Sensor Connector
A75742
ECM
Engine Coolant
Temperature Sensor
A18294
THWE2
ECM Connector
E13
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
05±201
AVENSIS REPAIR MANUAL (RM1018E)
2READ VALUE OF HAND±HELD TESTER(CHECK FOR OPEN IN WIRE HARNESS)
(a)Disconnect the engine coolant temperature sensor con-
nector.
(b)Connect terminals 1 and 2 of the engine coolant tempera- ture sensor connector.
(c)Turn the ignition switch ON.
(d)Select the item ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALL / COOLANT TEMPº and read its value displayed on
the hand±held tester.
Temperature value: 140
C (284
F) or more
OKCONFIRM GOOD CONNECTION AT SENSOR. IF OK, REPLACE WATER TEMP. SENSOR
NG
3READ VALUE OF HAND±HELD TESTER(CHECK FOR OPEN IN ECM)
(a)Disconnect the engine coolant temperature sensor con- nector.
(b)Connect terminals THW and E2 of the E13 ECM connec- tor.
HINT:
Before checking, do a visual and contact pressure check for the
ECM connector.
(c)Turn the ignition switch ON.
(d)Select the item ºDIAGNOSIS / OBD/MOBD / DATA LIST
/ ALL / COOLANT TEMPº and read its value displayed on
the hand±held tester.
Temperature value: 140
C (284
F) or more
OKREPAIR OR REPLACE HARNESS OR CONNECTOR
NG
CONFIRM GOOD CONNECTION AT ECM. IF OK, CHECK AND REPLACE ECM (See page 01±32)

A75766
ECM
Engine Coolant
Temperature Sensor
A75744
ECM
Engine Coolant
Temperature Sensor
A65743ECM Connector
E13
05±202
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
4READ VALUE OF HAND±HELD TESTER(CHECK FOR SHORT IN WIRE HARNESS)
(a)Disconnect the engine coolant temperature sensor con- nector.
(b)Turn the ignition switch ON.
(c)Select the item ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALL / COOLANT TEMPº and read its value displayed on
the hand±held tester.
Temperature value: ±40
C (±40
F)
OKREPLACE ENGINE COOLANT TEMPERATURE SENSOR
NG
5READ VALUE OF HAND±HELD TESTER(CHECK FOR SHORT IN ECM)
(a)Disconnect the E13 ECM connector.
(b)Disconnect the engine coolant temperature sensor con- nector.
(c)Turn the ignition switch ON.
(d)Select the item ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALL / COOLANT TEMPº and read its value displayed on
the hand±held tester.
Temperature: ±40
C (±40
F)
OKREPAIR OR REPLACE HARNESS OR CONNECTOR
NG
CHECK AND REPLACE ECM (See page 01±32)

A18294
THWE2
ECM Connector
E13
A65743
THWE2
ECM Connector
E13
A76786
Wire Harness Side
E2Engine Coolant Temperature
Sensor Connector
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
05±203
AVENSIS REPAIR MANUAL (RM1018E)
When not using hand±held tester:
1INSPECT ECM(THW VOLTAGE)
(a)Turn the ignition switch ON.
(b)Measure the voltage between terminals THW and E2 of
the ECM connector.
Voltage:
Intake air temp.Voltage
20
C (68
F)0.5 to 3.4 V
60
C (140
F)0.2 to 1.0 V
OKCHECK FOR INTERMITTENT PROBLEMS
(See page 05±149)
NG
2INSPECT ENGINE COOLANT TEMPERATURE SENSOR (See page 10±20)
NGREPLACE ENGINE COOLANT TEMPERATURE SENSOR
OK
3CHECK HARNESS AND CONNECTOR(ECM ± EFI WATER TEMP. SENSOR)
(a)Disconnect the E13 ECM connector.
(b)Disconnect the engine coolant temperature sensor con- nector.
(c)Check for continuity between the wire harness side con- nector.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
THW (E13±19) ± Engine coolant temperature sensor (E2±2)ContinuityE2 (E13±28) ± Engine coolant temperature sensor (E2±1)Continuity
Standard (Check for short):
Symbols (Terminal No.)Specified condition
THW (E13±19) or Engine coolant temperature sensor (E2±2)
± Body groundContinuity
MGREPAIR OR REPLACE HARNESS ORCONNECTOR
OK
CHECK AND REPLACE ECM (See page 01±32)

± 20 0 20 40 60 80 100
(± 4) 32 68 104 140 176 212 30
20
10
5
3
2
1
0.5
0.3
0.2
0.1
A67628
Acceptable (Fig.1)
Resistance K

Temp. C (F)
05±194
± DIAGNOSTICSSFI SYSTEM (1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
DTC P0110/24 INTAKE AIR TEMPERATURE CIRCUIT
MALFUNCTION
DTC P0112/24 INTAKE AIR TEMPERATURE CIRCUIT LOW
INPUT
DTC P0113/24 INTAKE AIR TEMPERATURE CIRCUIT HIGH
INPUT
CIRCUIT DESCRIPTION
The intake air temperature sensor is built in the mass air flow
meter and senses the intake air temperature.
A thermistor built in the sensor changes the resistance value
according to the intake air temperature.
The lower the intake air temperature is the greater the thermis-
tor resistance value becomes and the higher the intake air tem-
perature is the lower the thermistor resistance value becomes
(See Fig. 1).
The intake air temperature sensor is connected to the ECM
(See below ). The 5 V power source voltage in the ECM is ap-
plied to the intake air temperature sensor from terminal THA
(THAR) via resistor 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 potential at terminal THA (THAR)
also changes. Based on this signal, the ECM increases the fuel
injection volume to improve the driveability during cold engine
operation.
DTC No.Proceed toDTC Detection ConditionTrouble Area
P0110/24Step 1
Open or short in intake air
temp. sensor circuit for 0.5
sec.

Open or short in intake air temperature sensor circuit
P0112/24Step 4Short in intake air temp. sen-
sor circuit for 0.5 sec.

Oen or short in intake air tem erature sensor circuit

Intake air temperature sensor (built in mass air flow meter)

ECM
P0113/24Step 2Open in intake air temp. sen-
sor circuit for 0.5 sec.
After confirming DTC ºP0110/24, P0112/24 or P0113/24º, use the hand±held tester to confirm the intake air
temperature from the ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALLº.
Temperature DisplayedMalfunction
±40C (±40Open circuit
140C (284  Short circuit
05C7G±01

A72925
BR
G±R
28
20
E13 THA
E2 ECM
5 4
A6
Intake Air Temperature Sensor
(Built in Mass Air Flow Meter)
E135V
R
THA
E2
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
05±195
AVENSIS REPAIR MANUAL (RM1018E)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:

If different DTCs that are related to a different system are output simultaneously while terminal E2 is
used as a ground terminal, terminal E2 may be open.

Read freeze frame data using
\b\b
\b 
\f
 Freeze frame data records the engine conditions
when a malfunction is detected. When troubleshooting, it is useful for d\
etermining whether the vehicle
was running or stopped, the engine was warmed up or not, the air±fuel ra\
tio was lean or rich, etc. at
the time of the malfunction.
When using hand±held tester:
1READ VALUE OF HAND±HELD TESTER(INTAKE AIR TEMPERATURE)
(a)Connect the hand±held tester to the DLC3.
(b)Turn the ignition switch ON and push the hand±held tester main switch \
ON.
(c)Select the item ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALL / INTAKE AIRº and read its value dis- played on the hand±held tester.
Temperature: Same value as the actual intake air temperature.
Result:
Temperature DisplayedProceed to
±40C (±40 )A
140 C (284 ) or moreB
OK (Same as present temperature)C
HINT:

If there is an open circuit, the hand±held tester indicates ±40 C (±40 F).

If there is a short circuit, the hand±held tester indicates 140 C (284 F) or more.
BGo to step 4
CCHECK FOR INTERMITTENT PROBLEMS (See page 05±149)
A

A75743
Mass Air flow meterECM
A54396
A6
Wire Harness Side
Mass Air Flow Meter ConnectorE2
THA
A75742
ECM
Mass Air flow meter
A18294
THAE2
ECM Connector
E13
05±196
± DIAGNOSTICSSFI SYSTEM (1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
2 READ VALUE OF HAND±HELD TESTER(CHECK FOR OPEN IN WIRE HARNESS)
(a) Disconnect the mass air flow meter connector.
(b) Connect terminals THA and E2 of the mass air flow meter
connector.
(c) Turn the ignition switch ON.
(d) Select the item ºDIAGNOSIS / OBD/MOBD / DATA LIST
/ ALL / INTAKE AIRº and read its value displayed on the
hand±held tester.
Temperature value: 140
C (284
F) or more
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 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 for the
ECM connector.
(c) Turn the ignition switch ON.
(d) Select the item ºDIAGNOSIS / OBD/MOBD / DATA LIST
/ ALL / INTAKE AIRº and read its value displayed on the
hand±held tester.
Temperature value: 140
C (284
F) or more
OK REPAIR OR REPLACE HARNESS OR
CONNECTOR
NG

A75766
ECM
Mass Air Flow
Meter Connector
A75744
ECM
Mass Air flow meter
A65743
E13
ECM Connector
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
05±197
AVENSIS REPAIR MANUAL (RM1018E)
CONFIRM GOOD CONNECTION AT ECM. IF OK, CHECK AND REPLACE ECM (See page 01±32)
4READ VALUE OF HAND±HELD TESTER(CHECK FOR SHORT IN WIRE HARNESS)
(a)Disconnect the mass air flow meter connector.
(b)Turn the ignition switch ON.
(c)Select the item ºDIAGNOSIS / OBD/MOBD / DATA LIST
/ ALL / INTAKE AIRº and read its value displayed on the
hand±held tester.
Temperature value: ±40
C (±40
F)
OKREPLACE MASS AIR FLOW METER
NG
5READ VALUE OF HAND±HELD TESTER(CHECK FOR SHORT IN ECM)
(a)Disconnect the E13 ECM connector.
(b)Turn the ignition switch ON.
(c)Select the item ºDIAGNOSIS / OBD/MOBD / DATA LIST / ALL / INTAKE AIRº and read its value displayed on the
hand±held tester.
Temperature value: ±40
C (±40
F)
OKREPAIR OR REPLACE HARNESS OR CONNECTOR
NG
CHECK AND REPLACE ECM (See page 01±32)