Acura RSX Honda Integra. Manual — part 90
*19
*20
Idle Control System Diagram
Intake Air System Diagram
11-66
Fuel and Emissions Systems
System Description (cont’d)
BLK
BLK/
RED
YEL/BLK
ECM/PCM
BLK
AIR CLEANER
AIR INTAKE DUCT
IAC VALVE
ENGINE
COOLANT
THROTTLE BODY
INTAKE MANIFOLD
VARIOUS
SENSORS
From
PGM-FI
MAIN
RELAY
BLK
BLK/
RED
YEL/BLK
ECM/PCM
BLK
AIR CLEANER
AIR INTAKE DUCT
IAC VALVE
ENGINE
COOLANT
THROTTLE BODY
INTAKE MANIFOLD
VARIOUS
SENSORS
From
PGM-FI
MAIN
RELAY 1
RESONATOR
The idle speed of the engine is controlled by the Idle Air Control (IAC) valve:
• After the engine starts, the IAC valve opens for a certain amount of time. The amount of air is increased to raise the
idle speed.
• When the engine coolant temperature is low, the IAC valve is opened to obtain the proper fast idle speed. The
amount of bypassed air is controlled in relation to engine coolant temperature.
This system supplies air for engine needs. A resonator in the intake air pipe provides additional silencing as air is
drawn into the engine.
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38
Intake Manifold Tuning (IMT) (Intake Manifold Runner Control (IMRC)) System (K20A3 engine)
11-67
IMT (IMRC) SOLENOID VALVE ON
ENGINE SPEED IS ABOVE 4,700 rpm
IMT (IMRC) SOLENOID VALVE
IMT (IMRC)
ACTUATOR
From
No. 4 ACG (10 A) fuse
BLK/
YEL
RED/
BLU
BLK
IMT (IMRC) CHECK VALVE
ECM/
PCM
Engine power is achieved by closing and opening the intake manifold tuning (IMT) (intake manifold runner control
(IMRC)) valve. When the valve is closed, there is high torque at low engine speed. When the valve is open, there is
high torque at high engine speed.
(cont’d)
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−
Evaporative Emission (EVAP) Control Diagram
2002-2004 Models
11-68
Fuel and Emissions Systems
System Description (cont’d)
VARIOUS
SENSORS
ECM/PCM
From
No. 4 ACG
(10 A) fuse
EVAP CANISTER
VENT SHUT VALVE
EVAP CANISTER
PURGE VALVE
EVAP
CANISTER
EVAP BYPASS
SOLENOID VALVE
EVAP TWO WAY
VALVE
FUEL TANK
FTP
SENSOR
EVAP
VALVE
FUEL TANK
VAPOR
SIGNAL TUBE
FUEL TANK
VAPOR
RECIRCULATION
VALVE
FUEL
FILL CAP
FUEL TANK
VAPOR
RECIRCULATION
TUBE
FUEL TANK
VAPOR
CONTROL
VALVE
BLU/RED
LT GRN/RED
PNK
LT GRN
YEL/BLU
YEL/
BLU
BLK
BLK/ORN
The EVAP controls minimize the amount of fuel vapor escaping to the atmosphere. Vapor from the fuel tank is
temporarily stored in the EVAP canister until it can be purged from the canister into the engine and burned.
• The EVAP canister is purged by drawing fresh air through it and into a port on the intake manifold.
The purging vacuum is controlled by the EVAP canister purge valve, which operates whenever engine coolant
temperature is above 149 °F (65 °C).
• When vapor pressure in the fuel tank is higher than the set value of the EVAP two way valve, the valve opens and
regulates the flow of fuel vapor to the EVAP canister.
• During refueling, the fuel tank vapor control valve opens with the pressure in the fuel tank, and feeds the fuel vapor
to the EVAP canister.
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−
Evaporative Emission (EVAP) Control Diagram
2005-2006 Models
11-69
VARIOUS
SENSORS
ECM/PCM
From
No. 4 ACG
(10 A) fuse
EVAP CANISTER
VENT SHUT VALVE
EVAP CANISTER
PURGE VALVE
FUEL TANK
FTP SENSOR
FUEL TANK
VAPOR
RECIRCULATION
VALVE
FUEL
FILL CAP
FUEL TANK
VAPOR
CONTROL
VALVE
EVAP
CANISTER
LT GRN/RED
PNK
LT GRN
YEL/BLU
BLK/ORN
BLK
YEL/BLU
ATMOSPHERE
ATMOSPHERE
BLK/ORN
The EVAP controls minimize the amount of fuel vapor escaping to the atmosphere. Vapor from the fuel tank is
temporarily stored in the EVAP canister until it can be purged from the canister into the engine and burned.
The EVAP canister is purged by drawing fresh air through it and into a port on the intake manifold.
The purging vacuum is controlled by the EVAP canister purge valve, which operates whenever engine coolant
temperature is above 140 °F (60 °C).
(cont’d)
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