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
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