TOYOTA SIENNA 2007 Service Repair Manual

2GR-FE EMISSION CONTROL – AIR FUEL RATIO SENSOR (for 2WD)EC–17
EC
ENGINE
2GR-FE EMISSION CONTROL
AIR FUEL RATIO SENSOR (for 2WD)
COMPONENTS
A162935E02

EC–182GR-FE EMISSION CONTROL – AIR FUEL RATIO SENSOR (for 2WD)
EC
ON-VEHICLE INSPECTION
HINT:
The type of ignition switch on this model differs according to
the specifications of the vehicle. For the expressions used in
this section, refer to the "EXPRESSIONS OF IGNITION
SWITCH" precaution (See page ES-1).
1. CHECK AIR FUEL RATIO COMPENSATION SYSTEM
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Select the following menu items: Data List / A/FS B1
S1 and O2S B1 S2.
(d) Warm up the A/F sensor with the engine speed at
2500 rpm for approximately 2 minutes.
(e) Keep the engine speed at 2500 rpm and confirm
that the "A/FS B1 S1" and "A/FS BS S1" display is
as shown in the illustration.
HINT:
• The illustration may slightly differ from the display
on the intelligent tester.
• Only the intelligent tester displays the waveform
of the A/F sensor.
• On the tester, select the following menu items:
DIAGNOSIS / ENHANCED OBD II / ACTIVE
TEST / A/F CONTROL.
• The A/F CONTROL operation lowers the fuel
injection volume by 12.5% or increases the
injection volume by 25%.
• The sensors react in accordance with increases
and decreases in the fuel injection volume.
Standard
NOTICE:
The A/F sensor has an output delay of a few
seconds.
(f) Confirm that the "O2S B1 S2" and "A/FS BS S1"
display changes between 0 to 1 V with the engine
speed at 2500 rpm.
OK:
The voltage output oscillates more than 8
times in 10 seconds.
NOTICE:
• Perform the check immediately after warming
the engine up.
• If the voltage variation could not be verified,
warm up the A/F sensor again. If it could not
be verified even after warming up the sensor
again, check for DTCs (See page ES-39).
A111996E08
Tester Display
(Sensor)Injection Volume Status Voltage
AFS B1 S1
(A/F)+25% Rich Less than 3.0
-12.5% Lean More than 3.35
AFS B2 S1
(A/F)+25% Rich Less than 3.0
-12.5% Lean More than 3.35

2GR-FE EMISSION CONTROL – AIR FUEL RATIO SENSOR (for 2WD)EC–19
EC
REMOVAL
1. DISCONNECT CABLE FROM NEGATIVE BATTERY
TERMINAL
2. REMOVE AIR FUEL RATIO SENSOR (for Bank 2
Sensor 1)
(a) Disconnect the sensor connector.
(b) Using SST, remove the sensor from the exhaust
manifold.
SST 09224-00010
3. REMOVE FRONT EXHAUST PIPE ASSEMBLY
(a) Disconnect the heated oxygen sensor (for Bank 1
Sensor 2) connector under the center console.
(b) Remove the 2 bolts and 2 compression springs.
(c) Remove the 6 nuts and front exhaust pipe
assembly.
A162948E01
A162949
A162483

EC–202GR-FE EMISSION CONTROL – AIR FUEL RATIO SENSOR (for 2WD)
EC
4. REMOVE EXHAUST MANIFOLD RH
(a) Remove the nut, bolt and exhaust manifold stay.
(b) Disconnect the air fuel ratio sensor (for Bank 1
Sensor 1) connector.
(c) Remove the 6 nuts and exhaust manifold RH.
(d) Remove the gasket and exhaust manifold to head
gasket.
5. REMOVE AIR FUEL RATIO SENSOR (for Bank 1
Sensor 1)
(a) Using SST, remove the sensor.
SST 09224-00010
INSPECTION
1. INSPECT AIR FUEL RATIO SENSOR
(a) Measure the resistance of the sensor.
Standard resistance
If the resistance is not as specified, replace the
sensor.
A162950
A162951
A163254E01
A161867E02
Tester Connection Specified Condition
1 (HT) - 2 (+B) 1.8 to 3.4
at 20C (68F)
1 (HT) - 4 (AF-) 10 k
or higher

EC–242GR-FE EMISSION CONTROL – AIR FUEL RATIO SENSOR (for 4WD)
EC
ENGINE
2GR-FE EMISSION CONTROL
AIR FUEL RATIO SENSOR (for 4WD)
COMPONENTS
A162936E01

2GR-FE EMISSION CONTROL – AIR FUEL RATIO SENSOR (for 4WD)EC–25
EC
ON-VEHICLE INSPECTION
HINT:
The type of ignition switch on this model differs according to
the specifications of the vehicle. For the expressions used in
this section, refer to the "EXPRESSIONS OF IGNITION
SWITCH" precaution (See page ES-1).
1. CHECK AIR FUEL RATIO COMPENSATION SYSTEM
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Select the following menu items: Data List / A/FS B1
S1 and O2S B1 S2.
(d) Warm up the A/F sensor with the engine speed at
2500 rpm for approximately 2 minutes.
(e) Keep the engine speed at 2500 rpm and confirm
that the "A/FS B1 S1" and "A/FS BS S1" display is
as shown in the illustration.
HINT:
• The illustration may slightly differ from the display
on the intelligent tester.
• Only the intelligent tester displays the waveform
of the A/F sensor.
• On the tester, select the following menu items:
DIAGNOSIS / ENHANCED OBD II / ACTIVE
TEST / A/F CONTROL.
• The A/F CONTROL operation lowers the fuel
injection volume by 12.5% or increases the
injection volume by 25%.
• The sensors react in accordance with increases
and decreases in the fuel injection volume.
Standard
NOTICE:
The A/F sensor has an output delay of a few
seconds.
(f) Confirm that the "O2S B1 S2" and "A/FS BS S1"
display changes between 0 to 1 V with the engine
speed at 2500 rpm.
OK:
The voltage output oscillates more than 8
times in 10 seconds.
NOTICE:
• Perform the check immediately after warming
the engine up.
• If the voltage variation could not be verified,
warm up the A/F sensor again. If it could not
be verified even after warming up the sensor
again, check for DTCs (See page ES-39).
A111996E08
Tester Display
(Sensor)Injection Volume Status Voltage
AFS B1 S1
(A/F)+25% Rich Less than 3.0
-12.5% Lean More than 3.35
AFS B2 S1
(A/F)+25% Rich Less than 3.0
-12.5% Lean More than 3.35

EC–262GR-FE EMISSION CONTROL – AIR FUEL RATIO SENSOR (for 4WD)
EC
REMOVAL
1. DISCONNECT CABLE FROM NEGATIVE BATTERY
TERMINAL
CAUTION:
Wait at least 90 seconds after disconnecting the
cable from the negative (-) battery terminal to
prevent airbag and seat belt pretensioner activation.
2. REMOVE AIR FUEL RATIO SENSOR (for Bank 2
Sensor 1)
(a) Disconnect the sensor connector.
(b) Using SST, remove the sensor from the exhaust
manifold.
SST 09224-00010
3. REMOVE CENTER EXHAUST PIPE ASSEMBLY
(a) Disconnect the heated oxygen sensor (for Bank 1
Sensor 2) connector under the center console.
(b) Remove the clip as shown in the illustration.
(c) Remove the 2 bolts and 2 compression springs.
A162948E01
A163447
A162949

2GR-FE EMISSION CONTROL – AIR FUEL RATIO SENSOR (for 4WD)EC–27
EC
(d) Remove the 2 bolts, 2 nuts and center exhaust pipe
assembly.
4. REMOVE EXHAUST MANIFOLD RH
(a) Remove the nut, bolt and exhaust manifold stay.
(b) Remove the 6 nuts and exhaust manifold RH.
(c) Remove the gasket and exhaust manifold to head
gasket.
A163384
A162950
A162951

2GR-FE EMISSION CONTROL – HEATED OXYGEN SENSOR (for 2WD)EC–31
EC
ENGINE
2GR-FE EMISSION CONTROL
HEATED OXYGEN SENSOR (for 2WD)
COMPONENTS
A163379E01

EC–322GR-FE EMISSION CONTROL – HEATED OXYGEN SENSOR (for 2WD)
EC
REMOVAL
1. DISCONNECT CABLE FROM NEGATIVE BATTERY
TERMINAL
CAUTION:
Wait at least 90 seconds after disconnecting the
cable from the nagative (-) battery terminal to
prevent airbag and seat belt pretensioner activation.
2. REMOVE HEATED OXYGEN SENSOR (for Bank 1
Sensor 2)
(a) Disconnect the sensor connector under the center
console.
(b) Using SST, remove the heated oxygen sensor.
SST 09224-00010
3. REMOVE FRONT EXHAUST PIPE ASSEMBLY
(a) Disconnect the heated oxygen sensor (for Bank 2
Sensor 2) connector.
(b) Remove the 2 bolts and 2 compression springs.
A162954E01
A162949