Acura TSX / Honda Accord CL. Manual - part 539

2004 ENGINE PERFORMANCE

EVAP System - TSX 

COMPONENT LOCATION INDEX 

Fig. 1: Locating EVAP System Components (1 Of 2)

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE EVAP System - TSX

  

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE EVAP System - TSX

  

 

 

Fig. 2: Locating EVAP System Components (2 Of 2) 

DTC TROUBLESHOOTING 

DTC TROUBLESHOOTING INDEX 

DTC P0442: EVAP SYSTEM SMALL LEAK DETECTED; DTC P0456: EVAP SYSTEM VERY 

DTC

Description

DTC P0442

EVAP System Small Leak Detected

DTC P0456

EVAP System Very Small Leak Detected

DTC P0443

EVAP Canister Purge Valve Circuit Malfunction

DTC P0451

FTP Sensor Range/Performance Problem

DTC P0452

FTP Sensor Circuit Low Voltage

DTC P0453

FTP Sensor Circuit High Voltage

DTC P0457

EVAP System Leak Detected/Fuel Cap Loose or Missing

DTC P0496

EVAP System High Purge Flow

DTC P0497

EVAP System Low Purge Flow

DTC P0498

EVAP Canister Vent Shut Valve Circuit Low Voltage

DTC P0499

EVAP Canister Vent Shut Valve Circuit High Voltage

DTC P1454

FTP Sensor Range/Performance Problem

DTC P2422

EVAP Canister Vent Shut Valve Stuck Closed Malfunction

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE EVAP System - TSX

  

 

SMALL LEAK DETECTED 

Special Tools Required: Vacuum Pump/Gauge, 0-30 in. Hg A973X-041-XXXXX 

1. Check the fuel fill cap (the cap must say "If not tightened 3 clicks check engine light may come on"). 

Is the correct fuel fill cap installed and properly tightened? 

YES: Go to step 2.  

NO: Replace or tighten the cap, then go to step 22 .  

2. Check the fuel fill cap seal (A) and the fuel fill pipe mating surface (B). Verify that the fuel fill cap tether 

cord (C) is not caught under the cap. 

Is the fuel fill cap seal missing or damaged, is the fuel fill pipe damaged, or is the tether cord 
caught under the cap? 

YES: Replace the fuel fill cap or the fuel fill pipe, then go to step 22 .  

NO: Go to step 3.  

NOTE:

The fuel system is designed to allow specified maximum vacuum and pressure 
conditions. Do not deviate from the vacuum and pressure tests as indicated in 
these procedures. Excessive pressure/vacuum would damage the EVAP 
components or cause eventual fuel tank failure.

NOTE:

Fresh fuel has a higher volatility that will create greater pressure/vacuum. The 
optimum condition for testing is less than a full tank of fresh fuel. If possible, to 
assist in leak detection, add 1 gallon of fresh fuel to the tank (as long as it will 
not fill the tank) just before starting these procedures.

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE EVAP System - TSX

  

 

Fig. 3: Checking The Fuel Fill Cap Seal & The Fuel Fill Pipe Mating Surface 

3. Turn the ignition switch ON (II).  

4. Clear the DTC with the HDS.  

5. Do the EVAP FUNCTION TEST in the INSPECTION MENU with the HDS. 

Is the result OK? 

YES: Intermittent failure, system is OK at this time. Check for poor connections or loose 
terminals at the FTP sensor, the EVAP canister purge valve, or the EVAP canister vent shut 
valve and the ECM/PCM.  

NO: Go to step 6.  

6. Turn the ignition switch OFF.  

7. Turn the ignition switch ON (II).  

8. Check for a poor connection or damage at the fuel tank vapor recirculation tube (see EVAPORATIVE 

EMISSION (EVAP) CONTROL SYSTEM ). 

Is the tube OK? 

 

2004 Acura TSX 

2004 ENGINE PERFORMANCE EVAP System - TSX