ο‘
2. Check for looseness or damage at the fuel fill pipe and the fuel vapor return pipe.
Are the parts OK?
YES : The fuel fill pipe and fuel vapor return pipe are OK. Check the fuel tank unit base gasket and the
fuel tank, then do the repair verification .
NO : Repair or replace the damaged parts, then do the repair verification .
REPAIR VERIFICATION
ο‘
ο‘
ο‘
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1. Turn the ignition switch to LOCK (0).
2. Install the parts in the reverse order of removal.
3. Turn the ignition switch to ON (II).
4. Reset the PCM with the HDS See HOW TO TROUBLESHOOT THE A/T SYSTEM or HOW
TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS .
ο‘
ο‘
5. DO THE PCM IDLE LEARN PROCEDURE .
6. Do the EVAP FUNCTION TEST with the HDS.
Is the result OK?
YES : Troubleshooting is complete.
NO : Check for poor connections or loose terminals at the FTP sensor, the EVAP canister purge valve, the
EVAP canister vent shut valve, and the PCM, then go to step 1.
DTC P0456: EVAP SYSTEM VERY SMALL LEAK DETECTED
Fig. 210: DTC Troubleshooting Flow Chart (P0456)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Special Tools Required
Vacuum Pump/Gauge, 0-30 inHg Snap-on YA4000A or equivalent, commercially available
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:
ο¬
Before you troubleshoot, record all freeze data and any on-board
snapshot, and review the general troubleshooting information See HOW
TO TROUBLESHOOT THE A/T SYSTEM or HOW TO TROUBLESHOOT THE
FUEL AND EMISSIONS SYSTEMS .
ο¬
Fresh fuel has a higher volatility that will create greater pressure/vacuum.
The best 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.
Confirmed
DTC
Pending
DTC
Freeze
Frame
DTC Description
P0456 EVAP SYSTEM VERY SMALL LEAK
DETECTED
1. Fuel fill cap installation check:
ο‘
1. Check the fuel fill cap (the cap must say TIGHTEN TO CLICK). It should turn 1/4 turn after it is
tight, then it clicks.
Is the correct fuel fill cap installed and properly tightened?
YES : Go to step 2.
NO : Replace the fuel fill cap or tighten the cap, then do the repair verification .
2. Fuel fill cap seal and fuel fill pipe matching surface check:
ο‘
1. Check the fuel fill cap seal (A) and the fuel fill pipe matching surface (B). Verify that the fuel fill
cap tether cord (C) is not caught under the cap.
Fig. 211: Identifying Fuel Fill Cap Seal, Cap Tether Cord, Pipe Matching Surface
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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 do the repair verification .
NO : The fuel fill cap and the fuel fill pipe are OK. Go to step 3.
3. Problem verification:
ο‘
1. Turn the ignition switch to ON (II).
ο‘
2. Clear the DTC with the HDS See HOW TO TROUBLESHOOT THE A/T SYSTEM or
HOW TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS .
ο‘
3. Select the EVAP TEST in the INSPECTION MENU, and do the FUNCTION TEST with the
HDS.
Is the result OK?
YES : Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at
the FTP sensor, the EVAP canister purge valve, the EVAP canister vent shut valve, and the PCM.
NO : The failure is duplicated. Go to step 4.
4. Fuel tank vapor recirculation tube visual check:
ο‘
1. Turn the ignition switch to LOCK (0).
ο‘
2. Check for a poor connection or damage at the fuel tank vapor recirculation tube.
Is the tube OK?
YES : The tube is OK. Go to step 5.
NO : Replace the fuel tank vapor recirculation tube, or REPLACE THE FUEL TANK if needed, then do
the repair verification .
5. Determine possible failure area (EVAP canister vent shut valve, others):
ο‘
1. Disconnect the fuel tank vapor control valve hose (A) and the fresh air hose (B) from the EVAP
canister (C), and plug the EVAP canister ports (D).
Fig. 212: Identifying Fuel Tank Vapor Control Valve Hose, Fresh Air Hose, EVAP Canister
And Ports
Courtesy of AMERICAN HONDA MOTOR CO., INC.
ο‘
2. Disconnect the vacuum hose (engine side) (A) from the EVAP canister purge valve (B) in the
engine compartment, then connect a vacuum pump/gauge, 0-30 inHg, to the purge control solenoid
valve as shown.
Fig. 213: Identifying EVAP Canister Purge Valve And Vacuum Hose (Engine Side)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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3. Turn the ignition switch to ON (II).
4. Select EVAP TEST in the INSPECTION MENU, and do the EVAP PCS ON and EVAP CVS
ON in the MULTI SOLENOIDS with the HDS.
ο‘
5. Apply vacuum to the hose until the FTP reads 1.90 V (-0.59 inHg, -15.1 mmHg).
NOTE:
Be careful not to exceed the vacuum. If you do, the FTP sensor can
be damaged.
Current conditions
Signal
FTP SENSOR
Values
Unit
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6. Do the EVAP PCS OFF and EVAP CVS ON in the MULTI SOLENOIDS with the HDS, then
remove the vacuum pump/gauge from the purge control solenoid valve.
7. Check the parameter(s) below with the HDS for 1 minute.
Current conditions
Signal
Values
Unit
FTP SENSOR
Does the voltage increase more than 0.2 V (0.1 inHg, 2.5 mmHg)?
YES : Go to step 6.
NO : Go to step 8.
6. EVAP canister purge line leak check:
ο‘
1. Turn the ignition switch to LOCK (0).
ο‘
2. Reconnect the vacuum hose (A) (engine side) to the EVAP canister purge valve.
Fig. 214: Identifying EVAP Canister Purge Valve And Vacuum Hose (Engine Side)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
ο‘
3. Disconnect the vacuum hose (EVAP canister side) (B) from the EVAP canister purge valve (C)
in the engine compartment, then connect the vacuum pump/gauge to the purge control solenoid
valve as shown.
ο‘
ο‘
4. Turn the ignition switch to ON (II).
5. Select EVAP TEST in the INSPECTION MENU, and do the EVAP CVS ON in the SINGLE
SOLENOID with the HDS.
ο‘
6. Apply vacuum to the hose until the FTP reads 1.90 V (-0.59 inHg, -15.1 mmHg).
NOTE:
Be careful not to exceed the vacuum. If you do, the FTP sensor can
be damaged.
Current conditions
Signal
FTP SENSOR
Values
Unit
ο‘
7. Check the parameter(s) below with the HDS for 1 minute.
Current conditions
Signal
Values
Unit
FTP SENSOR
Does the voltage increase more than 0.2 V (0.1 inHg, 2.5 mmHg)?
YES : Go to step 7.
NO : The EVAP canister purge line is OK. REPLACE THE EVAP CANISTER PURGE VALVE ,
then do the repair verification .
7. EVAP canister purge line visual check:
ο‘
1. Check for a loose or damaged EVAP canister purge line between the EVAP canister and the
EVAP canister purge valve. Also check for a leaking EVAP canister.
Are the line and the canister OK?
YES : Replace these parts, then do the repair verification .
ο¬
ο¬
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FTP sensor O-ring
EVAP canister vent shut valve case and O-ring
EVAP canister
NO : Reconnect or repair the EVAP canister purge line, then do the repair verification .
8. EVAP canister vent shut valve operation check:
ο‘
1. Turn the ignition switch to LOCK (0).
ο‘
2. Reconnect the fresh air hose (A) from the EVAP canister (B).
Fig. 215: Identifying Air Hose And EVAP Canister
Courtesy of AMERICAN HONDA MOTOR CO., INC.
ο‘
ο‘
3. Reconnect the vacuum hose (engine side) to the EVAP canister purge valve.
4. Disconnect the vacuum hose (EVAP canister side) (A) from the EVAP canister purge valve (B)
in the engine compartment, then connect the vacuum pump/gauge to the purge control solenoid
valve as shown.
Fig. 216: Identifying Vacuum Hose (EVAP Canister Side) And EVAP Canister Purge Valve
Courtesy of AMERICAN HONDA MOTOR CO., INC.
ο‘
ο‘
5. Turn the ignition switch to ON (II).
6. Select EVAP TEST in the INSPECTION MENU, and do the EVAP CVS ON in the SINGLE
SOLENOID with the HDS.
ο‘
7. Apply vacuum to the hose until the FTP reads 1.90 V (-0.59 inHg, -15.1 mmHg).
NOTE:
Be careful not to exceed the vacuum. If you do, the FTP sensor can
be damaged.
Current conditions
Signal
FTP SENSOR
Values
Unit
ο‘
8. Check the parameter(s) below with the HDS for 1 minute.
Current conditions
Signal
Values
Unit
FTP SENSOR
Does the voltage increase more than 0.2 V (0.1 inHg, 2.5 mmHg)?
YES : REPLACE THE EVAP CANISTER VENT SHUT VALVE , then do the repair verification .
NO : The EVAP canister vent shut valve is OK. Go to step 9.
9. Fuel fill pipe and fuel vapor return pipe visual check:
ο‘
1. Do the EVAP CVS OFF in the SINGLE SOLENOID with the HDS.
ο‘
2. Check for looseness or damage at the fuel fill pipe and the fuel vapor return pipe.
Are the parts OK?
YES : The fuel fill pipe and fuel vapor return pipe are OK. Check the fuel tank unit base gasket and the
fuel tank, then do the repair verification .
NO : Repair or replace the damaged parts, then do the repair verification .
REPAIR VERIFICATION
ο‘
ο‘
ο‘
ο‘
1. Turn the ignition switch to LOCK (0).
2. Install the parts in the reverse order of removal.
3. Turn the ignition switch to ON (II).
4. Reset the PCM with the HDS See HOW TO TROUBLESHOOT THE A/T SYSTEM or HOW
TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS .
ο‘
ο‘
5. DO THE PCM IDLE LEARN PROCEDURE .
6. Do the EVAP FUNCTION TEST with the HDS.
Is the result OK?
YES : Troubleshooting is complete.
NO : Check for poor connections or loose terminals at the FTP sensor, the EVAP canister purge valve, the
EVAP canister vent shut valve, and the PCM, then go to step 1.
DTC P0457: EVAP SYSTEM LEAK DETECTED/FUEL FILL CAP LOOSE OR
MISSING
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