1NZ-FE EMISSION CONTROL – EMISSION CONTROL SYSTEM EC–1

EMISSION CONTROL SYSTEM

1NZ-FE EMISSION CONTROL
ENGINE

PARTS LOCATION

VENTILATION VALVE

HEATED OXYGEN SENSOR

(for Bank 1 Sensor 2)

TWC EC

HEATED OXYGEN SENSOR

(for Bank 1 Sensor 1)

CANISTER
PURGE VSV - PUMP MODULE

VENT LINE
AIR INLET LINE

FUEL TANK CAP

CANISTER FILTER

PURGE LINE

A116890E01
 EC–2 1NZ-FE EMISSION CONTROL – EMISSION CONTROL SYSTEM

SYSTEM DIAGRAM

ECM

EC Purge VSV

Throttle Body

From
Canister

Heated Oxygen Sensor

(for Bank 1 Sensor 1)

Air
Cleaner

TWC Heated Oxygen Sensor

(for Bank 1 Sensor 2)

A116883E01
 1NZ-FE EMISSION CONTROL – EMISSION CONTROL SYSTEM EC–3

Fuel Tank Cap

Float Valve

To
Intake Manifold

Fuel Cutoff Valve Fuel Tank

Purge Line

Canister Filter
Purge VSV
Vent Line EC
Air Inlet Line

Refueling Valve

Leak Detection Pump

Canister

ECM

Vent Valve Canister Pump Module Canister Pressure Sensor

A120008E01
 EC–4 1NZ-FE EMISSION CONTROL – EMISSION CONTROL SYSTEM

ECM

Purge VSV

From EFI
PRG
MAIN Relay

Canister Pump Module

MGND
EC Leak
Detection
Pump

MPMP
MTRB

VPMP
VLVB VGND

SGND

Canister
Pressure PPMP
Sensor VOUT

VC
VCC

E2

A116885E01
 1NZ-FE EMISSION CONTROL – EMISSION CONTROL SYSTEM EC–5

ECM

EFI

MREL

Heated Oxygen Sensor

(Bank 1 Sensor 1)

HT1A HT1A
EC
Shielded

+B OX1A OX1A

E2

Heated Oxygen Sensor

(Bank 1 Sensor 2)

HT1B HT1B
Shielded

+B OX1B OX1B

EFI

E2 E2

MAIN

A116884E01
 EC–6 1NZ-FE EMISSION CONTROL – EMISSION CONTROL SYSTEM

ON-VEHICLE INSPECTION
1. CHECK FUEL CUT RPM
(a) Increase the engine speed to at least 3,500 rpm.
(b) Use a sound scope to check for injector operating
noise.
(c) Check that the operating sounds stop momentarily
Sound Scope and then resume when the throttle lever is released.
Injector HINT:
A077509E02
Measure with the A/C OFF.
Fuel return rpm:
1,400 rpm
2. VISUALLY CHECK HOSES, CONNECTORS, AND
GASKETS
(a) Check that there are no cracks, leaks or damage.
NOTICE:
• Detachment or other problems with the
engine oil dipstick, filler cap, PCV hose and
EC other components may cause the engine to
run improperly.
• Disconnection, looseness or cracks in the
B000412 parts of the air induction system between the
throttle body and cylinder head will allow air
suction and cause an engine failure or engine
malfunctions.
If the result is not as specified, replace parts as
necessary.
3. CHECK LINE AND CONNECTORS
(a) Visually check for loose connections, sharp bends
or damage.
4. CHECK FUEL TANK ASSEMBLY
(a) Visually check for deformation, cracks or fuel
leakage.
5. CHECK FUEL TANK AND VENT LINE

Vent Line Tube

Fuel Tank Cap

Charcoal Canister

A116902E01

(a) Disconnect the vent line hose from the canister.

(b) Connect the pressure gauge to the vent line tube.
1NZ-FE EMISSION CONTROL – EMISSION CONTROL SYSTEM EC–7

(c) Apply 4 kPa (41 kgf/cm2, 30 mmHg) of pressure to

the vent line of the fuel tank.
HINT:
Perform this inspection with the fuel tank less than
90% full. When the fuel tank is full, the fuel cutoff
valve closes and pressure is released through the
1.5 mm orifice. As a result, when the fuel tank cap is
removed, pressure does not decrease smoothly.
(d) Check that the fuel tank pressure is maintained for
some time, and does not decrease immediately.
HINT:
If pressure decreases immediately, one of the
following may be the cause:
• The fuel tank cap is not completely tightened.
• The fuel tank cap is damaged.
• Air is leaking from the vent line.
• The fuel tank is damaged.
(e) When the fuel tank cap is removed, check that
pressure is released smoothly. EC
HINT:
If the pressure does not drop, replace the fuel tank
assembly.
(f) Reconnect the vent line tube to the canister.
6. CHECK AIR INLET LINE
(a) Disconnect the air inlet line hose from the charcoal
canister.
(b) Check that air flows freely into the air inlet line.
HINT:
If air does not flow freely into the air inlet line, repair
or replace it.
(c) Reconnect the air inlet line hose to the charcoal
canister.
 EC–8 1NZ-FE EMISSION CONTROL – CANISTER

CANISTER
1NZ-FE EMISSION CONTROL
ENGINE

COMPONENTS

EC

VENT LINE TUBE

PURGE LINE HOSE

AIR INLET LINE TUBE

CANISTER PUMP MODULE CONNECTOR

CANISTER

19 (194, 14)

N*m (kgf*cm, ft.*lbf) : Specified torque

A116893E01
1NZ-FE EMISSION CONTROL – CANISTER EC–9

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 CANISTER
(a) Disconnect the connector and detach the 2 clamps.

A116904

(b) Disconnect the 2 tubes and hose.

EC
(1) Using a screwdriver, pry up the retainer.
HINT:
Do not remove the retainer.

A113198

(2) Disconnect the purge line hose.

(3) Disconnect the air inlet line tube from the
canister.
(4) Disconnect the vent line tube from the canister
(leak detection pump).

A116905
 EC–10 1NZ-FE EMISSION CONTROL – CANISTER

(c) Remove the 3 bolts and canister.

A116906

INSPECTION
1. INSPECT CANISTER
(a) Visually check the canister for cracks or damage.
If cracks or damage are found, replace the canister.

EC
A105940

(b) Check the canister operation.

Purge Port (1) While holding the purge port closed, blow air
0.39 kPa (4.0 kgf/cm2, 3 mmHg) into the vent
port, and check that air flows from the air inlet
port.
If the result is not as specified, replace the
canister.
Vent Port Air Inlet Port
Air
A105941E04

(2) While holding the air inlet port closed, blow air
Purge Port
0.39 kPa (4.0 kgf/cm2, 3 mmHg) into the vent
Air Inlet Port port, and check that air flows from the purge
port.
If the result is not as specified, replace the
canister.

Vent Port
Air
A123647E01

(3) While holding the air inlet port closed, apply

Purge Port Air Inlet Port
vacuum 3.43 kPa (35.0 kgf/cm2, 25.7 mmHg)
to the vent port, and check that air is sucked
into the purge port.
If the result is not as specified, replace the
canister.

Vent Port Vacuum

A123648E01
 1NZ-FE EMISSION CONTROL – CANISTER EC–11

(c) Check the air tightness.

Purge Port Air Inlet Port (1) While holding the vent and air inlet ports
closed, apply vacuum 3.43 kPa (35.0 kgf/cm2,
25.7 mmHg) to the purge port, and check that
the vacuum is maintained for 1 minute.
If the result is not as specified, replace the
canister.

Vent Port Vacuum

A123649E01

(d) Check the diaphragm.

Purge Port Air Inlet Port (1) Remove the air hose between ports A and B.
(2) While holding the vent, purge and air inlet ports
A
closed, apply vacuum 1.42 kPa (14.5 kgf/cm2,
10.6 mmHg) port A, and check that air is not
sucked into port B.

Vent Port B Vacuum

EC
A123650E01

(3) While holding the vent, purge and air inlet ports
Purge Port Air Inlet Port
closed, apply vacuum 1.42 kPa (14.5 kgf/cm2,
10.6 mmHg) into port A, and measure how long
A it takes for the vacuum to drop.
Vacuum drop time:
10 seconds or more
If the result is not as specified, replace the
canister.
Vent Port Vacuum
A123651E01

(e) Check leak detection pump.

(1) Check that air flows from port A to port B and
C.
C If the result is not as specified, replace the
canister.

A
Air B
A105944E01

(2) Connect the positive (+) lead of the battery to

Valve Closed terminal 7 and the negative (-) lead to terminal
6.
(3) Check that the valve is closed.
If the result is not as specified, replace the
7 6 canister.
(4) Install the canister pump module.

A105945E01
 EC–12 1NZ-FE EMISSION CONTROL – CANISTER

INSTALLATION
1. INSTALL CANISTER
(a) Install the canister with the 3 bolts.
Torque: 19 N*m (194 kgf*cm, 14 ft.*lbf)

A116906

(b) Connect the 2 tubes and hose.

EC
A116905

(1) Connect the air inlet line tube to the canister

(leak detection pump).
(2) Connect the vent line tube to the canister.
(3) Connect the purge line hose.
HINT:
Install the hose to the canister, and then attach
the retainer.

A113197

(c) Connect the connector and attach the 2 clamps.

2. CONNECT CABLE TO NEGATIVE BATTERY
TERMINAL
3. PERFORM INITIALIZATION
(a) Perform initialization (see page IN-23).
NOTICE:
Certain systems need to be initialized after
disconnecting and reconnecting the cable from
A116904 the negative (-) battery terminal.
 1NZ-FE EMISSION CONTROL – VACUUM SWITCHING VALVE EC–13

VACUUM SWITCHING VALVE

1NZ-FE EMISSION CONTROL
ENGINE

COMPONENTS
PURGE VSV CONNECTOR

MAF METER CONNECTOR

PURGE LINE HOSE

(from Canister)

PURGE VSV
AIR CLEANER CAP
EC

PURGE LINE HOSE

(from Throttle Body)

A116898E01
 EC–14 1NZ-FE EMISSION CONTROL – VACUUM SWITCHING VALVE

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 CLEANER CAP
(a) Disconnect the MAF meter connector.
(b) Disconnect the purge VSV connector.
(c) Disconnect the 2 wire harness clamps from the air
cleaner cap.
(d) Disconnect the 2 purge line hoses.
(e) Disconnect the purge line hose from the hose
clamp.
(f) Unlock the 2 clamps holding the air cleaner cap to
A116913 the air cleaner case.
EC (g) Loosen the hose clamp and remove the air cleaner
cap.
3. REMOVE PURGE VSV
(a) Remove the screw and purge VSV.

A116911

23 to 26 Ω at 20 °C (68°F) INSPECTION
1 1. INSPECT PURGE VSV
(a) Measure the resistance of the purge VSV.
Standard resistance
Tester Connection Specified Condition
1-2 23 to 26 Ω at 20°C (68°F)
2
1 - Body ground 10 MΩ or higher
2 - Body ground

If the result is not as specified, replace the purge

10 MΩ or higher VSV.
1

A116899E01
1NZ-FE EMISSION CONTROL – VACUUM SWITCHING VALVE EC–15

(b) Check operation of the purge VSV.

(1) Check that air does not flow from port E to port
Air F.
E

F
A116900E01

(2) Apply battery voltage across terminals 1 and 2.

Air (3) Check that air flows from port E to port F.
If the result is not as specified, replace the
E purge VSV.

F
EC
A116901E01

INSTALLATION
1. INSTALL PURGE VSV
(a) Install the purge VSV with the screw.

A116911

2. INSTALL AIR CLEANER CAP

(a) Install the air cleaner cap and tighten the hose
clamp.
(b) Lock the 2 clamps holding the air cleaner cap to the
air cleaner case.
(c) Connect the purge line hose to the hose clamp.
(d) Connect the 2 purge line hoses.
(e) Connect the 2 wire harness clamps to the air
cleaner cap.
A116913 (f) Connect the purge VSV connector.
(g) Connect the MAF meter connector.
3. CONNECT CABLE TO NEGATIVE BATTERY
TERMINAL
4. PERFORM INITIALIZATION
(a) Perform initialization (see page IN-23).
NOTICE:
Certain systems need to be initialized after
disconnecting and reconnecting the cable from
the negative (-) battery terminal.
 EC–16 1NZ-FE EMISSION CONTROL – VENTILATION VALVE

VENTILATION VALVE
1NZ-FE EMISSION CONTROL
ENGINE

COMPONENTS

7.0 (71, 62 in.*lbf)

27 (275, 20)
VENTILATION VALVE

VENTILATION HOSE

EC

NO. 2 CYLINDER HEAD COVER

N*m (kgf*cm, ft.*lbf) : Specified torque

Precoated part
A116892E01
 1NZ-FE EMISSION CONTROL – VENTILATION VALVE EC–17

REMOVAL
1. REMOVE NO. 2 CYLINDER HEAD COVER (See page
FU-11)
2. DISCONNECT VENTILATION HOSE
(a) Disconnect the ventilation hose from the ventilation
valve.
3. REMOVE VENTILATION VALVE
(a) Remove the ventilation valve.

A116912

INSPECTION
1. INSPECT VENTILATION VALVE
(a) Install a clean hose to the ventilation valve.
Cylinder Head Side (b) Check the ventilation valve operation.
(1) Blow air into the cylinder head side, and check
EC
that air passes through easily.
CAUTION:
Clean Hose Air
Do not suck air through the valve.
A105282E01
Petroleum substances inside the valve are
hazardous to your health.
(2) Blow air into the intake manifold side, and
Intake Manifold Side
check that air passes through with difficulty.
Air If the result is not as specified, replace the
ventilation valve.
(c) Remove the clean hose from the ventilation valve.

Clean Hose

A105281E02

INSTALLATION
Adhesive 1. INSTALL VENTILATION VALVE
(a) Apply adhesive to 2 or 3 threads of the valve.
Adhesive:
Part No. 08833-00070, THREE BOND 1324 or
equivalent.
(b) Install the ventilation valve.
Torque: 27 N*m (275 kgf*cm, 20 ft.*lbf)
A105280E01
 EC–18 1NZ-FE EMISSION CONTROL – VENTILATION VALVE

2. CONNECT VENTILATION HOSE

(a) Connect the ventilation hose to the ventilation valve.
3. INSTALL NO. 2 CYLINDER HEAD COVER (See page
FU-15)

A116912

EC
 1NZ-FE EMISSION CONTROL – HEATED OXYGEN SENSOR (for Bank 1 Sensor 1) EC–19

HEATED OXYGEN SENSOR (for Bank 1 Sensor 1)

1NZ-FE EMISSION CONTROL
ENGINE

COMPONENTS

EC

44 (449, 32)*1
40 (408, 30)*2

HEATED OXYGEN SENSOR

(for Bank 1 Sensor 1)

N*m (kgf*cm, ft.*lbf) : Specified torque

*1: For use with SST

*2: For use without SST

A116914E01
 EC–20 1NZ-FE EMISSION CONTROL – HEATED OXYGEN SENSOR (for Bank 1 Sensor 1)

ON-VEHICLE INSPECTION
1. CHECK AIR-FUEL RATIO COMPENSATION SYSTEM
HINT:
The system can also be checked by choosing "DATA
MONITOR/O2SENSOR OUTPUT VOLTAGE" on the
intelligent tester monitor.
(a) Connect the intelligent tester to terminals E3-21
(OX1A) and E3-28 (E2) of the ECM.
E3 E4 E5 NOTICE:
Connect test leads from the backside of the
connector with the ECU connected.
(b) Warm up the heated oxygen sensor at an engine
speed of 2,500 rpm for approximately 2 minutes.
OX1A E2 (c) Check that the voltage varies between
ECM Connector approximately 0 V and 1 V at an engine speed of
A018294E86 2,500 rpm.
OK:
EC The voltage varies more than 8 times in 10
seconds.
NOTICE:
• Perform the check immediately after warming
up the heated oxygen sensor.
• If the voltage variation could not be verified,
warm up the heated oxygen sensor again.
2. INSPECT HEATED OXYGEN SENSOR
(a) Disconnect the sensor connector.
(b) Measure the resistance of the sensor.
Standard resistance
+B HT1A
Tester Connection Specified Condition
1 (HT1A) - 2 (+B) 11 to 16 Ω at 20°C (68°F)
1 (HT1A) - 4 (E2) 10 kΩ or higher

If the result is not as specified, replace the sensor.

E2 (c) Connect the sensor connector.

A081938E02
 1NZ-FE EMISSION CONTROL – HEATED OXYGEN SENSOR (for Bank 1 Sensor 1) EC–21

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 HEATED OXYGEN SENSOR
(a) Disconnect the sensor connector.

A077776E02

(b) Using SST, remove the sensor.

EC
SST 09224-00010

SST

) A116894E01

INSTALLATION
1. INSTALL HEATED OXYGEN SENSOR
(a) Using SST, install the sensor.
SST 09224-00010
Torque: 44 N*m (449 kgf*cm, 32 ft.*lbf) for use
with SST
40 N*m (408 kgf*cm, 30 ft.*lbf) for use
Fulcrum
without SST
Length
HINT:
Use a torque wrench with a fulcrum length of 30 cm
SST (11.81 in.).
(b) Connect the sensor connector.
2. CONNECT CABLE TO NEGATIVE BATTERY
) TERMINAL
A116897E01

3. PERFORM INITIALIZATION
(a) Perform initialization (see page IN-23).
NOTICE:
Certain systems need to be initialized after
disconnecting the cable from the negative (-)
battery terminal.
4. CHECK FOR EXHAUST GAS LEAKS
If gas is leaking, tighten the problem areas to stop the
leak. Replace damaged parts as necessary.
 EC–22 1NZ-FE EMISSION CONTROL – HEATED OXYGEN SENSOR (for Bank 1 Sensor 2)

HEATED OXYGEN SENSOR (for Bank 1 Sensor 2)

1NZ-FE EMISSION CONTROL
ENGINE

COMPONENTS
Automatic Transaxle

STEREO JACK ADAPTER

REAR CONSOLE BOX COVER

CONSOLE BOX CARPET

EC
REAR CONSOLE BOX

A118616E05

Manual Transaxle

STEREO JACK ADAPTER

SHIFT LEVER KNOB

REAR CONSOLE BOX COVER

CONSOLE BOX CARPET

REAR CONSOLE BOX

A118617E05
 1NZ-FE EMISSION CONTROL – HEATED OXYGEN SENSOR (for Bank 1 Sensor 2) EC–23

44 (449, 32)*1
40 (408, 30)*2

HEATED OXYGEN SENSOR

(for Bank 1 Sensor 2)

EC

N*m (kgf*cm, ft.*lbf) : Specified torque

*1: For use with SST

*2: For use without SST

A116915E01
 EC–24 1NZ-FE EMISSION CONTROL – HEATED OXYGEN SENSOR (for Bank 1 Sensor 2)

ON-VEHICLE INSPECTION
1. CHECK AIR-FUEL RATIO COMPENSATION SYSTEM
HINT:
The system can also be checked by choosing "DATA
MONITOR/O2SENSOR OUTPUT VOLTAGE" on the
intelligent tester monitor.
(a) Connect the intelligent tester to terminals E3-25
(OX1B) and E3-28 (E2) of the ECM.
E3 E4 E5 NOTICE:
Connect test leads from the backside of the
connector with the ECU connected.
(b) Warm up the heated oxygen sensor at an engine
speed of 2,500 rpm for approximately 2 minutes.
OX1B E2 (c) Check that the voltage varies between
ECM Connector approximately 0 V and 1 V at an engine speed of
A018294E87 2,500 rpm.
OK:
EC The voltage varies more than 8 times in 10
seconds.
NOTICE:
• Perform the check immediately after warming
up the heated oxygen sensor.
• If the voltage variation could not be verified,
warm up the heated oxygen sensor again.
2. INSPECT HEATED OXYGEN SENSOR
(a) Disconnect the sensor connector.
(b) Measure the resistance of the sensor.
Standard resistance
+B HT1B Tester Connection Specified Condition
1 (HT1B) - 2 (+B) 11 to 16 Ω at 20°C (68°F)
1 (HT1B) - 4 (E2) 10 kΩ or higher

If the result is not as specified, replace the sensor.

E2 (c) Connect the sensor connector.

A081939E02
 1NZ-FE EMISSION CONTROL – HEATED OXYGEN SENSOR (for Bank 1 Sensor 2) EC–25

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 SHIFT LEVER KNOB (for Manual
Transaxle)
3. REMOVE REAR CONSOLE BOX (See page IP-26)
4. REMOVE HEATED OXYGEN SENSOR
(a) Disconnect the sensor connector.

EC
A077774E02

(b) Using SST, remove the sensor.

SST 09224-00010

SST

) A116895E01

INSTALLATION
1. INSTALL HEATED OXYGEN SENSOR
(a) Using SST, install the sensor.
SST 09224-00010
Fulcrum Torque: 44 N*m (449 kgf*cm, 32 ft.*lbf) for use
Length with SST
40 N*m (408 kgf*cm, 30 ft.*lbf) for use
without SST
HINT:
Use a torque wrench with a fulcrum length of 30 cm
SST (11.81 in.).
(b) Connect the sensor connector.
2. INSTALL REAR CONSOLE BOX (See page IP-27)
) A116896E01 3. INSTALL SHIFT LEVER KNOB (for Manual Transaxle)
4. CONNECT CABLE TO NEGATIVE BATTERY
TERMINAL
 EC–26 1NZ-FE EMISSION CONTROL – HEATED OXYGEN SENSOR (for Bank 1 Sensor 2)

5. PERFORM INITIALIZATION
(a) Perform initialization (see page IN-23).
NOTICE:
Certain systems need to be initialized after
disconnecting the cable from the negative (-)
battery terminal.
6. CHECK FOR EXHAUST GAS LEAKS
If gas is leaking, tighten the problem areas to stop the
leak. Replace damaged parts as necessary.

EC
 EC–26 1NZ-FE EMISSION CONTROL – FUEL TANK CAP

FUEL TANK CAP

ON-VEHICLE INSPECTION
1. CHECK FUEL TANK CAP ASSEMBLY
(a) Visually check if the cap or gasket is deformed or
damaged.
Gasket

) A123644E01

EC