Honda Odyssey 2004. Manual — part 88
*16
*17
Evaporative Emission (EVAP) Control
System
EVAP Canister
EVAP Canister Purge Valve
Fuel Tank Pressure (FTP) Sensor
EVAP Two Way Valve and EVAP Bypass Solenoid
Valve
11-50
Fuel and Emissions Systems
System Descriptions (cont’d)
SENSOR CHIP
To FTP SENSOR
To FUEL TANK
To EVAP
CANISTER
To EVAP
CANISTER
FILTER
VALVE
EVAP TWO WAY
VALVE
DIAPHRAGM
VALVE
EVAP BYPASS
SOLENOID VALVE
VALVE
Refer to the System Diagram to see a functional layout
of the system.
The EVAP canister temporarily stores fuel vapor from
the fuel tank until it can be purged into the engine and
burned.
When the engine coolant temperature is below 147°F
(64°C), the PCM turns off the EVAP canister purge valve
which cuts vacuum to the EVAP canister.
The FTP sensor converts fuel tank absolute pressure
into an electrical input to the PCM.
The EVAP two way valve is located between the fuel
tank and the EVAP canister line.
The EVAP two way valve sends fuel vapor to the EVAP
canister corresponding to the pressure inside the fuel
tank and prevents excessive vacuum in the fuel tank by
drawing in fresh air through the EVAP canister.
The EVAP bypass solenoid valve opens to bypass the
two way valve when doing the EVAP leak check.
03/07/29 09:18:15 61S0X050_110_0050
31
*52
Idle Control System Diagram
Intake Air System Diagram
11-51
VARIOUS SENSORS
INTAKE
MANIFOLD
ENGINE
COOLANT
IAC VALVE
BLK
BLK
BLK/
BLU
YEL/
BLK
PCM
From
PGM-FI
MAIN
RELAY
PCM
VARIOUS
SENSORS
INTAKE AIR
RESONATOR
AIR INTAKE DUCT
AIR TEMPERATURE
CONTROL VALVE
AIR CLEANER
INTAKE MANIFOLD
THROTTLE BODY
IAC VALVE
INTAKE AIR PIPE
From
PGM-FI
MAIN
RELAY
BLK
BLK/
RED
YEL/
BLK
INTAKE AIR
BYPASS CONTROL
THERMAL VALVE
ENGINE
COOLANT
BLK
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 thus controlled in relation to engine coolant temperature.
This system supplies air for engine needs. An intake air resonator in the intake air pipe provides additional silencing as
air is drawn into the system.
(cont’d)
03/07/29 09:19:21 61S0X050_110_0051
*53
Exhaust Gas Recirculation (EGR) System Diagram
11-52
Fuel and Emissions Systems
System Descriptions (cont’d)
EGR
VALVE
VARIOUS
SENSORS
PCM
EGR VALVE
POSITION
SENSOR
INTAKE
MANIFOLD
YEL/
BLU
WHT/
BLK
PNK
BLK
*1: GRN/YEL: ’02-04 models
*2: BLU/RED: ’02-04 models
GRN/
BLK
*
*
1
2
The EGR system reduces oxides of nitrogen (NOx) emissions by recirculating exhaust gas through the EGR valve and
the intake manifold into the combustion chambers. The PCM memory includes the ideal EGR valve lift for varying
operating conditions.
The EGR valve position sensor detects the amount of EGR valve lift and sends it to the PCM. The PCM then compares it
with the ideal lift in its memory (based on signals sent from other sensors). If there is any difference between the two,
the PCM cuts current to the EGR valve.
03/07/29 09:19:22 61S0X050_110_0052
*43
Evaporative Emission (EVAP) Control Diagram (’99-00 Models)
11-53
EVAP BYPASS
SOLENOID
VALVE
EVAP
TWO WAY
VALVE
FUEL TANK
FTP
SENSOR
EVAP CANISTER
VENT SHUT VALVE
PCM
VARIOUS
SENSORS
From
No. 6
ECU (PCM)
CRUISE
CONTROL
(15A)
(in the
driver’s
under-
dash
fuse/relay
box)
EVAP PURGE
CONTROL
SOLENOID
VALVE
EVAP
CONTROL
CANISTER
FILTER
EVAP
CONTROL
CANISTER
FUEL
FILL
CAP
EVAP LEAK
CHECK PORT
BLU
GRN/
BLK
LT
GRN
YEL/
BLU
BLK/
YEL
RED/
YEL
LT GRN/
WHT
BLK
The EVAP controls minimize the amount of fuel vapor escaping to the atmosphere. Vapor from the fuel tank is
temporarily stored in the EVAP control canister until it can be purged from the canister into the engine and burned.
• The EVAP control canister is purged by drawing fresh air through it and into a port on the throttle body. The purging
vacuum is controlled by the EVAP purge control solenoid valve, which operates whenever engine coolant
temperature is above 147°F (64°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 control canister.
(cont’d)
03/07/29 09:19:23 61S0X050_110_0053
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