California

Toyota Truck 4runner Vacuum Manifold

A03054

Vacuum Switch Reed Valve Resonator

EACV

Thermo Switch (2)

A03054

Vacuum Switch Reed Valve Resonator

EACV

Thermo Switch (2)

Thermo Switch (1 )

Thermo Switch (1 )

Reed Switch Vacuum

FEEDBACK OFF

Resonator

EACV (OFF)

EACV (OFF)

Resonator

Toyota Pickup Vacuum Sensor

Vacuum Switch

A03055

Vacuum Switch

A03055

To maintain a stoichiometric air/fuel ratio in order to simultaneously reduce HC, CO and NOx emissions by the three-way catalyst, consist of the fuel system feedback control system and air suction feedback system.

System Feedback Control System

*Vacuum Switch

Coolant Temp.

Thermo Switch

Engine RPM

Vehicle Speed

**Ox Sensor Signal

EACV

AS

(1)

(2)

OFF

CLOSED

OFF

ON

Below 6°C (43°F)

ON

ON

_

_

_

Between 18 - 44°C (64 - 111 °F)

OFF

Always OPEN

Always ON

Above 55°C (131 °F)

OFF

7 mph(1 1 km/h)

16mph(26km/h)

RICH

OPEN

ON

"""Feed BACK

Above 1,390 rpm

-

LEAN

CLOSED

System

Feedback

Control

System

"Vacuum Switch

**Ox Sensor Signal

EBCV

Fuel Control System

OFF

CLOSED

OFF

ON

RICH

OPEN

ON

* *"Feedback

LEAN

CLOSED

OFF

Remarks: * By means of vacuum switch, detects heavy load driving condition. "" Signal of air-fuel ratio of inlet gas for TWC. * * * By means of Ox sensor, detects oxygen concentration in exhaust manifold after combusion. If air-fuel ratio is rich for TWC, opens EACV and EBCV. If lean, closes EACV and EBCV.

j--Air-fuel ratio RICH Ox sensor RICH EACV, EBCV open-,

1-EACV, EBCV close «- Ox sensor LEAN Air-fuel ratio LEAN -J

Below 6 C

No Bubbling Noise

Between 18-44 C 1,390 rpm

Between 18-44 C 1,390 rpm

Bubbling Noise

EC0137 EC! 161

Bubbling Noise

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