Acura TSX / Honda Accord CL. Manual — part 566

Fig. 55: Cutaway View Of Three Way Catalytic Converter (TWC)

POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM

The PCV valve prevents blow-by gasses from escaping into the atmosphere by venting them into the intake
manifold.

2004 Acura TSX

2004 ENGINE PERFORMANCE Fuel & Emissions Systems - TSX

Fig. 56: Identifying Positive Crankcase Ventilation (PCV) System

EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM

Refer to the System Diagram to see the functional layout of the system.

EVAP Canister

The EVAP canister temporarily stores fuel vapor from the fuel tank until it can be purged from the EVAP
canister into the engine and burned.

EVAP Canister Purge Valve

2004 Acura TSX

2004 ENGINE PERFORMANCE Fuel & Emissions Systems - TSX

When the engine coolant temperature is below 131°F (55°C), the ECM/PCM turns off the EVAP canister purge
valve which cuts vacuum to the EVAP canister.

Fuel Tank Pressure (FTP) Sensor

The FTP sensor converts fuel tank absolute pressure into an electrical input to the ECM/PCM during the EVAP
leak check.

Fig. 57: Cutaway View Of Fuel Tank Pressure (FTP) Sensor

EVAP Canister Vent Shut Valve

The EVAP canister vent shut valve is on the EVAP canister. The EVAP canister vent shut valve controls the
venting of the EVAP canister.

2004 Acura TSX

2004 ENGINE PERFORMANCE Fuel & Emissions Systems - TSX

Fig. 58: Cutaway View Of EVAP Canister Vent Shut Valve

ELECTRONIC THROTTLE CONTROL SYSTEM DIAGRAM

The electronic throttle control system consists of the throttle actuator, throttle position (TP) sensor, accelerator
pedal position (APP) sensor, throttle actuator control module, and the ECM/PCM. The throttle is electronically
controlled by this system.

2004 Acura TSX

2004 ENGINE PERFORMANCE Fuel & Emissions Systems - TSX