SB-99-075

SB-10053545-3978
Service Bulletin
Applies To:
99-075
August 09, 2013
See VEHICLES AFFECTED
Troubleshooting DTC P1456 and P1457
(Supersedes 99-075, dated October 5, 1999, and replaces 99-074, dated August 24, 1999; see REVISION
SUMMARY)
REVISION SUMMARY
This service bulletin has been revised extensively;
American Honda recommends that you review the
entire bulletin.
Troubleshooting DTC P1456
• Before starting the troubleshooting procedure, run
the EVAP FUNCTION TEST with the HDS. If the
system passes the test, there is no malfunction with
the system in its current condition. If the system fails
the test, proceed with the troubleshooting procedure.
• Once you have identified the source of the leak and
repaired the vehicle, verify your repair by driving the
vehicle until the EVAP monitor has completed
successfully.
VEHICLES AFFECTED
1998–02 Accord
1996–00 Civic
1998–01 CR-V
2000–05 Insight
1999–04 Odyssey
2003–04 Pilot
2000–06 S2000
This bulletin updates the troubleshooting procedures
for DTC P1456 (EVAP control system leakage [Fuel
tank system]) and DTC P1457 (EVAP control system
leakage[EVAP canister system]). Depending on the
model, there are two individual procedures in this
bulletin. Procedure A applies to 1998–02 Accord,
1999–04 Odyssey, 2000–05 Insight, 2003–04 Pilot,
and 2000–06 S2000. Procedure B applies to 1996–00
Civic, and 1998–01 CR-V.
In the event you need to call Tech Line or have a
comeback, refer to the last section of this bulletin,
HANDLING A COMEBACK.
Troubleshooting of P1456 for Accord, Insight,
Odyssey, Pilot, and S2000
Page 1
Troubleshooting of P1457 for Accord, Insight,
Odyssey, Pilot, and S2000
Page 5
Troubleshooting of P1456 for Civic, and CR-V
Page 11
Troubleshooting of P1457 for Civic, and CR-V
Page 15
 2013 American Honda Motor Co., Inc. – All Rights Reserved
PROCEDURE A
(Applies to: 1998–02 Accord, 1999–04 Odyssey,
2000–05 Insight, 2003–04 Pilot, and 2000–06 S2000)
1. Check the FTP (fuel tank pressure) sensor value.
• Connect the HDS.
• Turn the ignition switch to ON (II) but leave the
engine off.
• Go to PGM_FI, select Data List, and find
FTP SENSOR.
Is the value greater than 2.7 V or less than
2.3 V?
Yes – The system is currently holding
pressure/ vacuum. Go to step 10.
No – The system is at atmospheric pressure,
there is a leak in the system. Go to step 2.
2. Check the fuel cap.
• Make sure the fuel cap is tight.
• The fuel cap must be made by Acura (it should
have the words “Must be tightened 3 clicks or
check engine light may come on” printed on the
cap). Make sure you replace the cap if it does
not.
Is the fuel cap tight?
Yes – If the fuel cap is tight, remove the fuel cap
and inspect the fuel fill neck, the sealing surface,
and the threads for any damage. Damage to any
of these components can result in a leak and
DTC P1456. If no damage is found, leave the fuel
cap off. Go to step 3.
No – If the cap is loose, tighten the cap at least
three clicks to properly seal the system. Then go
to step 10.
ATB 20662–49431 REV2 (1308)
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CUSTOMER INFORMATION: The information in this bulletin is intended for use only by skilled technicians who have the proper tools, equipment,
and training to correctly and safely maintain your vehicle. These procedures should not be attempted by “do-it-yourselfers,” and you should not assume
this bulletin applies to your vehicle, or that your vehicle has the condition described. To determine whether this information applies, contact an
authorized Honda automobile dealer.
3. Check the FTP sensor value on the HDS with the
fuel cap removed.
Is the value 2.45 V–2.55 V?
Yes – The FTP sensor is reading correctly.
Go to step 4.
No – The FTP sensor is reading out of its normal
range. Disconnect the hoses from the FTP sensor
and check the value on the HDS. If the value reads
between 2.45 V–2.55 V, inspect the hoses to the
FTP sensor for a restriction. If the value is still not
reading 2.45 V–2.55 V, make sure there is not an
open, short, or high resistance in the sensor circuit.
If the circuit tests OK, replace the FTP sensor. Go
to step 10.
4. Test the BPS (bypass solenoid) valve.
• Disconnect the hose from the EVAP two-way
valve that connects to the fuel tank.
• Disconnect the hose from the canister that
connects to the two-way valve.
NOTE: If fuel runs out of either hose, the
FTVR (fuel tank vapor control) valve is
malfunctioning or the fuel tank is being overfilled.
A few drops of fuel is normal.
• Connect a vacuum pump to the canister side
two-way valve hose.
BPS VALVE
CANISTER
HOSE TO
TANK
TWO-WAY
VALVE
• Apply about 5 in.Hg of vacuum to the system.
• Enter the HDS PGM-FI menu, and select
INSPECTION> EVAP TEST> SINGLE
SOLENOID> BYPASS SOLENOID. Click the
green check box to turn ON the BPS valve.
Did the vacuum bleed off when the BPS valve
was turned on?
Yes – The BPS valve is operating correctly. Go
to step 5.
No – The BPS valve is not operating correctly.
Make sure there is not an open, short, or high
resistance in the BPS valve circuit, if the circuit
tests OK, replace the BPS valve. Go to step 10.
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99-075
5. Test the EVAP two-way valve.
• Make sure the BPS valve is still commanded ON
with the HDS.
• Cap the open hose fitting on the two-way valve.
• Reconnect the vacuum pump.
BPS VALVE
TWO-WAY
VALVE
CAP
• Enter the HDS PGM-FI menu, and select
INSPECTION> EVAP TEST>
SINGLE SOLENOID> BYPASS SOLENOID.
Click the green check box to turn ON the BPS
valve.
• Watch the FTP sensor value on the HDS, and
gently apply vacuum until the value reads
approximately 1.50 V (It takes very little vacuum
to reach this value).
• Disconnect the electrical connector from the BPS
valve.
• Disconnect the vacuum pump.
• Watch the FTP sensor value on the HDS for
20 seconds.
Did the value increase more than 0.05 V in
20 seconds?
Yes – The two-way valve and BPS valve are not
operating correctly. Replace the two-way and
BPS valve. Go to step 10.
No – The two-way valve and BPS valve are
operating correctly. Go to step 6.
6. Test the fuel tank.
• Reconnect the BPS valve connector.
• Reconnect the two-way valve hose to the fuel
tank.
99-075
• Watch the FTP sensor value on the HDS, apply
vacuum until the FTP value reads approximately
2.10V.
NOTE: You may not be able to pull vacuum if
there is a large leak in the system. Answer Yes
to the question below if you cannot pull vacuum
after one minute.
Did the value increase more than 0.05 V in
20 seconds?
Yes – There is a leak in the tank side of the
system. Go to step 7.
No – The EVAP system is currently not leaking.
Go to step 10.
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7. Test the fuel tank vapor control valve.
• Make sure the BPS valve is still commanded ON
with the HDS.
• Disconnect the fuel tank vapor control valve hose
from the canister, and plug the opening.
8. Isolate the fuel fill neck and fuel cap.
• Make sure the BPS valve is still commanded ON
with the HDS.
• Disconnect the three hoses connected to the fuel
fill neck and cap the openings. Rubber cones
used to plug exhaust systems for leak testing are
ideal to plug the large filler neck hose.
FUEL FILL NECK
Cap.
Plug the fuel
tank vapor
control valve
hose.
• Watch the FTP sensor value on the HDS, and
gently apply vacuum until the value reads
approximately 2.10 V.
• Watch the FTP sensor value on the HDS, and
gently apply vacuum until the value reads
approximately 2.10 V.
NOTE: You may not be able to pull vacuum if
there is a large leak in the system. Answer Yes
to the question below if you cannot pull vacuum
after one minute.
Did the value increase more than 0.05 V in
20 seconds?
Yes – The fuel tank vapor control valve is not
leaking. Go to step 8.
No – The fuel tank vapor control valve is leaking.
Replace the fuel tank vapor control valve, then
go to step 10.
Did the value increase more than 0.05 V in
20 seconds?
Yes – The fuel fill neck and fuel cap are not
leaking. Go to step 9.
No – The fuel fill neck or fuel cap is leaking.
Replace the fuel fill neck and fuel cap, then go to
step 10.
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99-075
9. Isolate the fuel tank area leak.
• The leak has been isolated to the tank area.
Closely inspect all hoses and connections shown
in the picture for signs of any cracks, holes, or
other signs of leaks. Use a mirror and shop light
to inspect as much of the fuel tank as possible.
• If you are unable to locate a leak with a visual
inspection, you will need to remove the fuel tank
from the vehicle to continue with the diagnosis.
Follow the applicable electronic service manual
procedures to remove the fuel tank.
• After the fuel tank is removed, test the hoses
connected to the fuel tank for leaks by
disconnecting the hoses, plugging one end of the
hose and then applying vacuum to the other end.
If the hose does not hold steady vacuum for
20 seconds, replace the hose.
PLUG
• Thoroughly inspect the entire exterior shell of the
fuel tank for any signs of damage or leakage. if
no damage is found, replace the tank seals for
the ORVR (onboard refueling vapor recovery)
and fuel pump and re-assemble.
Troubleshooting DTC P1457
• Before starting the troubleshooting procedure, run
the EVAP FUNCTION TEST with the HDS. If the
system passes the test, there is no malfunction with
the system in its current condition. If the system fails
the test, proceed with the troubleshooting process.
• Once you have identified the source of the leak and
repaired the vehicle, verify your repair by driving the
vehicle until the EVAP monitor has completed
successfully.
1. Check the FTP (fuel tank pressure) sensor value.
• Remove the fuel cap.
• Connect the HDS.
• Turn the ignition switch to ON (ll), but leave the
engine off.
• Go to PGM-FI, select Data List, and find
FTP SENSOR.
Is the value between 2.45 V–2.55 V?
Yes – The FTP sensor is reading correctly. Go to
step 2.
No – The FTP sensor is reading out of its normal
range. Disconnect the hoses from the FTP
sensor, and check the value on the HDS. If the
value reads between 2.45 V–2.55 V, inspect the
hoses to the FTP sensor for a restriction. If the
value is still not reading 2.45 V–2.55 V, make
sure there is not an open, short, or high
resistance in the sensor circuit. If the circuit tests
OK, replace the FTP sensor. Go to step 9.
10. Confirm the repair.
• Clear the PGM-FI DTCs with the HDS.
• Short the SCS connector with the HDS.
• In the electronic service manual, search for
P1456 Advanced Diagnostics. Review the
enable conditions for the monitor to run.
• Drive the vehicle within the enable conditions
until the EVAP monitor completes or a temporary
DTC is set.
THE EVAP MONITOR PASSED – Repair is complete.
Return the vehicle to the customer.
A TEMPORARY DTC IS SET – There is a leak in the
system. Return to step 1.
NOTE: If a leak is still present, contact Tech Line.
99-075
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2. Test for canister side leaks.
• Leave the fuel cap off.
• Pinch the hose between the two-way valve and
the fuel tank.
• Attach a vacuum pump to the engine side of the
PCS valve.
PCS VALVE
• Enter the HDS PGM-FI menu, and select
INSPECTION> EVAP TEST> MULTI
SOLENOIDS> PCS ON> CVS ON> BPS ON.
L4 Models
• Make sure that you can hear and feel all of the
solenoids operate.
PCS VALVE
V6 Models
PCS VALVE
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99-075
• Apply vacuum to the system while monitoring the
FTP sensor value on the HDS. Stop when the
value reads approximately 1.50 V.
• Watch the value on the HDS for 20 seconds.
NOTE: If after 1 minute of attempting to pull
vacuum (on any test) the value does not
decrease, there is a large leak, select YES.
Did the value increase more than 0.05 V in
20 seconds?
Yes – There is a leak in the system. Go to step 3.
No – The system is not leaking. Go to step 9.
• Apply vacuum to the system while monitoring the
FTP sensor value reading on the HDS. Stop
when the value reads approximately 1.50 V.
3. Test the CVS (canister vent shut) valve.
• Pinch the hose between the two-way valve and
the fuel tank.
• Pinch the hose between the CVS valve and
EVAP filter.
FILTER
PCS VALVE
• Watch the value on the HDS for 20 seconds.
Did the value increase more than 0.05 V in
20 seconds?
Yes – The CVS valve is not leaking. Go to step 4.
No – The CVS valve is leaking. Inspect the CVS
valve O-ring; If damaged, replace the O-ring and
retest; otherwise, replace the CVS . Go to step 9.
CVS VALVE
• Enter the HDS PGM-FI menu, and select
INSPECTION> EVAP TEST>MULTI
SOLENOIDS> PCS ON> CVS ON> BPS ON.
4. Test the fuel tank vapor control valve.
• Disconnect the clamping pliers on the canister
vent hose.
• Disconnect the fuel tank vapor control hose from
the canister, and plug the fitting on the canister.
PLUG THIS
PORT
99-075
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• Enter the HDS PGM-FI menu, select
INSPECTION> EVAP TEST> MULTI
SOLENOIDS> PCS ON> CVS ON> BPS ON.
5. Test the two-way valve and BPS (bypass solenoid)
valve.
• Remove the vacuum pump, reconnect the hoses,
and remove the clamping pliers.
• Enter the HDS PGM-FI menu, and select
INSPECTION> EVAP TEST> SINGLE
SOLENOID> BYPASS SOLENOID. Click the
green check box to turn ON the BPS valve.
• Apply vacuum to the system while monitoring the
FTP sensor value reading on the HDS. Stop
when the value reads approximately 1.50 V.
• Disconnect the hose on the two-way valve that
goes to the fuel tank and cap the hose fitting on
the two-way valve.
• Disconnect the hose from the canister that
connects to the two-way valve.
• Connect a vacuum pump to the canister side
two-way valve hose.
TWO-WAY VALVE
CAP
BPS VALVE
PCS VALVE
• Watch the value on the HDS for 20 seconds.
Did the value increase more than 0.05 V in
20 seconds?
Yes – The fuel tank vapor control valve is not
leaking. Go to step 5.
No – The fuel tank vapor control valve or hose is
leaking and needs to be replaced. Once the
leaking component has been identified and
replaced, go to step 9.
CANISTER
• Watch the FTP sensor value on the HDS, gently
apply vacuum until the value reads
approximately 1.50 V (it takes very little vacuum
to reach this value).
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99-075
• Watch the value on the HDS for 20 seconds.
Did the value increaw more than 0.05 V in
20 seconds?
Yes – The two-way valve and BPS valve or FTP
sensor is leaking. Go to step 6.
No – The two-way valve, the BPS valve, and the
FTP sensor are not leaking. Go to step 7.
6. Test the FTP sensor.
• Disconnect the FTP sensor hose from the twoway valve.
7. Test the canister and hoses.
• Reconnect any disconnected hoses.
• Disconnect the fuel tank vapor control hose from
the canister, and plug the fitting on the canister.
• Pinch the hose between the two-way valve and
the fuel tank.
• Disconnect the purge hose from the canister, and
connect a vacuum pump to the canister fitting.
DISCONNECT THIS HOSE
DISCONNECT THIS HOSE
PLUG THIS
PORT
PINCH THIS HOSE
TWO-WAY VALVE
• Connect the vacuum pump to the FTP sensor
hose.
• Watch the value on the HDS, gently apply
vacuum until the value reads approximately
1.50 V (it takes very little vacuum to reach this
value).
• Watch the value on the HDS for 20 seconds.
Did the value increase more than 0.05 V in
20 seconds?
Yes – The FTP sensor or hose is leaking.
Replace the FTP sensor and hose. Go to step 9.
No – The two-way valve and BPS valve
assembly are leaking. Replace the two-way
valve and BPS valve assembly. Go to step 9.
• Enter the HDS PGM-FI menu, and select
INSPECTION> EVAP TEST> MULTI
SOLENOIDS> PCS ON> CVS ON> BPS ON.
• Watch the FTP sensor value on the HDS, and
gently apply vacuum until the value reads
approximately 1.50 V (it takes very little vacuum
to reach this value).
• Watch the value on the HDS for 20 seconds.
Did the value increase more than 0.05 V in
20 seconds?
Yes – The EVAP canister is leaking. Replace the
EVAP canister. Go to step 9.
No – The EVAP canister is not leaking. Go to
step 8.
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8. Test the purge hose.
• Leave the fuel tank vapor control hose
disconnected from the canister but make sure it
is still plugged.
• Leave the hose between the two-way valve and
the fuel tank pinched.
• Reconnect the purge hose to the canister.
• Enter the HDS PGM-FI menu, and select
INSPECTION> EVAP TEST> MULTI
SOLENOIDS. PCS ON> CVS ON> BPS ON.
RECONNECT
THIS HOSE
• Disconnect the purge hose from the PCS valve
that leads to the canister, and connect the
vacuum pump.
• Watch the FTP sensor value on the HDS, and
apply vacuum until the value reads
approximately 1.50 V.
• Watch the value on the HDS for 20 seconds.
Did the value increase more than 0.05 V in
20 seconds?
Yes – The purge hose/line is leaking. Replace
the purge hose/line that is leaking. Go to step 9.
No – The purge hose/line is not leaking.
Go to step 9.
9. Test the PCS valve.
• Reconnect all of the hoses disconnected under
the vehicle.
• Disconnect the hose leading to the PCS valve
from the canister.
• Connect a Mini Helic vacuum gauge to the PCS
valve.
DISCONNECT
THIS HOSE
PCS VALVE
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99-075
• Start the engine.
PROCEDURE B
(Applies to: 1996–00 Civic, and 1998–01 CR-V)
Troubleshooting DTC P1456
• Before starting the troubleshooting procedure, run
the EVAP FUNCTION TEST with the HDS. If the
system passes the test, there is no malfunction with
the system in its current condition. If the system fails
the test, proceed with the troubleshooting process.
• Once you have identified the source of the leak and
repaired the vehicle, verify your repair by driving the
vehicle until the EVAP monitor has completed
successfully.
PCS VALVE
Does the vacuum gauge show vacuum?
Yes – The PCS valve is leaking. Replace the
PCS valve. Go to step 10.
No – No leak has been found in the system.
Go to step 10.
10. Confirm the repair.
• Clear the PGM-FI DTCs with the HDS.
• Short the SCS connector with the HDS.
• In the electronic service manual, search for
P1457 Advanced Diagnostics. Review the
enable conditions for the monitor to run.
• Drive the vehicle within the enable conditions
until the EVAP monitor completes or a temporary
DTC is set.
THE EVAP MONITOR PASSED – Repair is complete.
Return the vehicle to the customer.
A TEMPORARY DTC IS SET – Go to step 1.
NOTE: If a leak is still present, contact Tech Line.
1. Check the FTP (fuel tank pressure) sensor value.
• Connect the HDS.
• Turn the ignition switch to ON (II) but leave the
engine off.
• Go to PGM_FI, select Data List, and find
FTP SENSOR.
Is the value greater than 2.7 V or less than
2.3 V?
Yes – The system is currently holding
pressure/ vacuum. Go to step 10.
No – The system is at atmospheric pressure,
there is a leak in the system. Go to step 2.
2. Check the fuel cap.
• Check that the fuel cap is tight.
• The fuel cap must be made by Acura. It should
have the words “Must be tightened 3 clicks or
check engine light may come on” printed on the
cap. Make sure you replace the cap if it does not.
Is the fuel cap tight?
Yes – If the cap is tight, remove the cap and
inspect the fuel fill neck, the sealing surface, and
the threads for any damage. Damage to any of
these components can result in a leak and DTC
P1456. If no damage is found leave the fuel cap
off. Go to step 3.
No – If the cap is loose, tighten the cap at least
three clicks to properly seal the system. Go to
step 10.
3. Check the FTP sensor value on the HDS with the
fuel cap removed.
Is the value 2.45 V–2.55 V?
Yes – The FTP sensor is reading correctly. Go to
step 4.
No – The FTP sensor is reading out of its normal
range. Disconnect the hoses from the FTP sensor,
and recheck the value on the HDS. If the value
reads between 2.45 V–2.55 V, inspect the hoses to
the FTP sensor for a restriction. If the value still is
not reading 2.45 V–2.55 V, verify there is not an
open, short, or high resistance in the sensor circuit.
If the circuit tests OK, replace the FTP sensor. Go
to step 10.
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4. Test the BPS (bypass solenoid) valve.
• Disconnect the hose from the two-way valve that
connects to the fuel tank.
• Disconnect the hose from the canister that
connects to the two-way valve.
NOTE: If fuel runs out of either hose, the FTVR
(fuel tank vapor recovery) valve is malfunctioning or
the fuel tank is being overfilled. A few drops of fuel
is normal.
• Connect a vacuum pump to the canister side
two-way valve hose.
5. Test the two-way valve.
• Make sure the BPS valve is still commanded ON
with the HDS.
• Cap the open hose fitting on the two-way valve.
FTP SENSOR
HOSE TO
CANISTER
CAP
HOSE TO
TANK
FTP SENSOR
HOSE TO
CANISTER
HOSE TO
TANK
BPS VALVE
TWO-WAY
VALVE
• Apply about 5 in.Hg of vacuum to the system.
• Enter HDS PGM-FI menu, and select
INSPECTION> EVAP TEST> SINGLE
SOLENOID> BYPASS SOLENOID. Click the
green check box to turn ON the BPS valve.
• Watch the FTP sensor value on the HDS, gently
apply vacuum until the value reads
approximately 1.50 V (it takes very little vacuum
to reach this value).
• Disconnect the electrical connector from the BPS
valve.
• Disconnect the vacuum pump.
• Watch the FTP sensor value on the HDS for 20
seconds.
Did the value increase more than 0.05 V in 20
seconds?
Yes – The two-way valve and BPS valve
assembly are leaking. Replace the two-way
valve and BPS valve assembly. Go to step 10.
No – The two-way valve and BPS valve
assembly are not leaking. Go to step 6.
Did the vacuum bleed off when the BPS valve
was turned on?
Yes – The BPS valve is operating correctly. Go
to step 5.
No – The BPS valve is not operating correctly.
Make sure there is not an open, short, or high
resistance in the BPS valve. If the circuit tests
OK, replace the BPS valve. Go to step 10.
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6. Test the fuel tank.
• Make sure the BPS valve is still commanded ON
with the HDS.
• Reconnect the BPS valve connector.
• Reconnect the two-way valve hose coming from
the fuel tank.
• Reconnect the vacuum pump.
7. Test the fuel tank vapor control valve.
• Make sure the BPS valve is still commanded ON
with the HDS.
• Disconnect the fuel tank vapor control valve hose
from the canister, and plug the opening.
HOSE TO
TANK
HOSE TO
TANK
HOSE TO
CANISTER
HOSE TO
CANISTER
• Watch the FTP sensor value on the HDS, apply
vacuum until the value reads approximately
2.10V.
NOTE: If after 1 minute of attempting to pull
vacuum (on any test) the value does not
decrease, there is a large leak, select YES.
Did the value increase more than 0.05 V in 20
seconds?
Yes – There is a leak in the tank side of the
system. Go to step 7.
No – No leak has been found in the system. Go
to step 10.
99-075
• Watch the FTP sensor value on the HDS, apply
vacuum until the value reads approximately
2.10 V.
NOTE: You may not be able to pull vacuum if
there is a large leak in the system. Answer yes to
the question below if you cannot pull vacuum
after one minute.
Did the value increase more than 0.05 V in 20
seconds?
Yes – The fuel tank vapor control valve is not
leaking. Go to step 8.
No – The fuel tank vapor control valve is leaking.
Replace the fuel tank vapor control valve. Go to
step 10.
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8. Isolate the fuel fill neck and fuel cap.
• Make sure the BPS valve is still commanded ON
with the HDS.
• Disconnect the three hoses connected to the fuel
fill neck and cap the openings. Rubber cones
used to plug exhaust systems for leak testing are
ideal to plug the large fuel fill neck hose.
CAP
• Watch the FTP sensor value on the HDS, apply
vacuum until the value reads approximately
2.10 V.
HOSE TO
TANK
HOSE TO
CANISTER
9. Isolate the fuel tank area leak.
• Reconnect all of the hoses that are
disconnected.
• The leak has been isolated to the tank area.
Closely inspect all hoses and connections shown
in the picture for signs of any cracks, holes, or
other signs of leaks. Use a mirror and shop light
to inspect as the fuel tank for any damage,
cracks or signs of leaks.
• If you are unable to locate a leak with a visual
inspection, you will need to remove the fuel tank
from the vehicle to continue with the diagnosis.
Follow the electronic service manual procedures
for your vehicle to remove the fuel tank.
• Once the fuel tank is removed, test the hoses
connected to the fuel tank for leaks by
disconnecting the hoses, plugging one end of the
hose and then applying vacuum to the other end.
If the hose does not hold steady vacuum for 20
seconds, replace the hose.
PLUG
Did the value increase more than 0.05 V in 20
seconds?
Yes – The fuel fill neck and fuel cap are not
leaking. Go to step 9.
No – The fuel fill neck or fuel cap is leaking.
Replace the fuel fill neck and the fuel cap. Go to
step 10.
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• Thoroughly inspect the fuel tank for any signs of
damage or leakage. If no damage is found,
replace the tank seals for the ORVR (onboard
refueling vapor recovery) and fuel pump and
re-assemble.
99-075
10. Confirm the repair.
• Run Function Test.
or
• Clear the PGM-FI DTCs with the HDS.
• Short the SCS connector with the HDS.
• In the electronic service manual, search for
P1456 Advanced Diagnostics. Review the
enable conditions for the monitor to run.
• Drive the vehicle within the enable conditions
until the EVAP monitor completes or a temporary
DTC is set.
2. Test for canister side leaks.
• Leave the fuel cap off.
• Pinch the hose between the two-way valve and
the fuel tank.
• Enter HDS PGM-FI menu, and select
INSPECTION> EVAP TEST> MULTI
SOLENOIDS> PCS ON> CVS ON> BPS ON.
THE EVAP MONITOR PASSED- Repair is complete.
Return the vehicle to the customer.
A TEMPORARY DTC IS SET- There is a leak in the
system. Return to step 1.
NOTE: If a leak is still present, contact Tech Line.
Troubleshooting DTC P1457
• Before starting the troubleshooting procedure, run
the EVAP FUNCTION TEST with the HDS. If the
system passes the test, there is no malfunction with
the system in its current condition. If the system fails
the test, proceed with the troubleshooting process.
• Once you have identified the source of the leak and
repaired the vehicle, verify your repair by driving the
vehicle until the EVAP monitor has completed
successfully.
1. Check FTP (fuel tank pressure) sensor value.
• Remove the fuel cap.
• Connect the HDS.
• Turn the ignition switch to ON (ll), but leave the
engine off.
• Go to PGM-FI, select Data list, and find FTP
SENSOR.
Is the value between 2.45 V–2.55 V?
Yes – The FTP sensor is reading correctly. Go to
step 2.
No – The FTP sensor is reading out of its normal
range. Disconnect the hoses from the FTP
sensor, and recheck the value on the HDS. If the
value reads between 2.45 V–2.55 V, inspect the
hoses to the FTP sensor for a restriction. If the
value is still not reading 2.45 V–2.55 V, make
sure there is not an open, short, or high
resistance in the sensor circuit. If the circuit tests
OK replace the FTP sensor. Go to step 9.
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• Make sure that you can hear and feel all of the
solenoids operate.
• Attach a vacuum pump to the engine side of the
PCS (purge control solenoid) valve.
• Apply vacuum to the system while monitoring the
FTP sensor on the HDS. Stop when the value
reads approximately 1.50 V.
TO CANISTER
• Watch the value on the HDS for 20 seconds.
NOTE: If after 1 minute of attempting to pull
vacuum (on any test) the value does not
decrease, there is a large leak, select YES.
Did the value increase more than 0.05 V in
20 seconds?
Yes – There is a leak in the system. Go to step 3.
No – The system is not leaking. Go to step 8.
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3. Test the CVS (canister vent shut) valve.
• Pinch the hose between the two-way valve and
the fuel tank.
• Enter the HDS PGM-FI menu, and select
INSPECTION> EVAP TEST>MULTI
SOLENOIDS> PCS ON> CVS ON> BPS ON.
Rear of vehicle.
TWO-WAY VALVE
• Apply vacuum to the system while monitoring the
FTP sensor value on the HDS. Stop when the
value reads approximately 1.50 V.
• Pinch the hose between the CVS valve and
EVAP filter.
Front of vehicle.
CVS VALVE
TO CANISTER
EVAP
CANISTER
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• Watch the value on the HDS for 20 seconds.
Did the value increase more than 0.05 V in 20
seconds?
Yes – The CVS valve is not leaking. Go to step 4.
No – The CVS valve is leaking. Inspect the CVS
valve O-ring. If damaged replace the O-ring and
retest; otherwise replace the CVS valve.
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4. Test the two-way and BPS (bypass solenoid) valve.
• Remove the vacuum pump, reconnect the hoses,
and remove the clamping pliers.
• Enter the HDS PGM-FI menu, and select
INSPECTION> EVAP TEST> SINGLE
SOLENOID> BYPASS SOLENOID. Click the
green check box to turn ON the BPS valve.
• Watch the value on the HDS for 20 seconds.
Did the value increase more than 0.05 V in 20
seconds?
Yes – The two-way valve and BPS valve or FTP
sensor is leaking. Go to step 5.
No – The two-way valve, the BPS valve, and the
FTP sensor are not leaking. Go to step 6.
5. Test the FTP sensor.
• Disconnect the FTP sensor hose from the twoway valve.
DISCONNECT
HOSE
• Disconnect the hose on the two-way valve that
goes to the fuel tank, and cap the hose fitting on
the two-way valve.
• Disconnect the hose from the canister that
connects to the two way valve.
• Connect a vacuum pump to the canister side
two-way valve hose.
HOSE TO
CANISTER
CAP
HOSE TO
TANK
TWO-WAY VALVE
• Connect the vacuum pump to the FTP sensor
hose.
• Watch the FTP sensor value on the HDS, then
gently apply vacuum until the value reads
approximately 1.50 V (it takes very little vacuum
to reach this value).
• Watch the value on the HDS for 20 seconds.
Did the value increase more than 0.05 V in 20
seconds?
Yes – The FTP sensor or hose is leaking.
Replace the FTP sensor and hose. Go to step 9.
No – The two-way valve or BPS valve is leaking.
Replace the two-way valve and BPS valve. Go to
step 9.
• Watch the FTP sensor value on the HDS, gently
apply vacuum until the value reads
approximately 1.50 V (it takes very little vacuum
to reach this value).
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6. Test the canister and hoses.
• Reconnect any disconnected hoses.
• Pinch the hose between the two-way valve and
the fuel tank.
Rear of vehicle.
• Watch the FTP value on the HDS, gently apply
vacuum until the value reads approximately
1.50 V (it takes very little vacuum to reach this
value).
• Watch the value on the HDS for 20 seconds.
Did the value increase more than 0.05 V in 20
seconds?
Yes – The EVAP canister is leaking. Replace the
EVAP canister. Go to step 9.
No – The EVAP canister is not leaking.
Go to step 7.
7. Test the purge hose.
• Leave the hose between the two-way valve and
the fuel tank pinched.
Rear of vehicle
TWO-WAY VALVE
• Disconnect the purge hose from the canister and
connect a vacuum pump to the canister fitting.
Front of vehicle
TWO-WAY VALVE
• Reconnect the purge hose to the canister.
• Disconnect the purge hose from the PCS valve
that leads to the canister, and connect the
vacuum pump.
Front of vehicle
EVAP CANISTER
• Enter the HDS PGM-FI menu, and select
INSPECTION> EVAP TEST> MULTI
SOLENOIDS> PCS ON> CVS ON> BPS ON.
TO CANISTER
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• Enter the HDS PGM-FI menu, and select
INSPECTION> EVAP TEST> MULTI
SOLENOIDS. PCS ON> CVS ON> BPS ON.
• Watch the FTP sensor value on the HDS, apply
vacuum until the value reads approximately
1.50 V.
• Watch the value on the HDS for 20 seconds.
Did the value increase more than 0.05 V in 20
seconds?
Yes – The purge hose/line is leaking. Replace
the purge hose/line that is leaking. Go to step 9.
No – The purge hose/line is not leaking.
Go to step 8.
8. Test the PCS valve.
• Reconnect all of the hoses disconnected.
• Disconnect the hose leading to the PCS valve
from the canister.
• Connect a Mini Helic vacuum gauge to the PCS
valve hose.
PCS VALVE
• Start the engine.
Does the vacuum gauge show vacuum?
Yes – The PCS valve is leaking. Replace the
PCS valve. Go to step 9.
No – No leak has been found in the system.
Go to step 9.
9. Confirm the repair.
• Clear the PGM-FI DTCs with the HDS.
• Short the SCS connector with the HDS.
• In the electronic service manual, search for
P1457 Advanced Diagnostics. Review the
enable conditions for the monitor to run.
• Drive the vehicle within the enable conditions
until the EVAP monitor completes or a temporary
DTC is set.
THE EVAP MONITOR PASSED - Repair is complete.
Return the vehicle to the customer.
A TEMPORARY DTC IS SET - Go to step 1.
NOTE: If a leak is still present, contact Tech Line.
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HANDLING A COMEBACK
If the vehicle comes back to your dealership more than
twice for the same DTC (either P1456 or P1457), and
the EVAP FUNCTION TEST does not show a problem
in the EVAP system, call Tech Line. Call only after you
have done the function test and written down or printed
out the TID (Test ID) information as instructed. When
you call Tech Line, make sure you have this
information on hand:
• Current set DTC.
• TID information retrieved from the vehicle. You can
access this through the generic scan tool program.
1. Open the generic scan tool program.
2. Connect the scan tool interface device to the
vehicle, and select Connect.
4. Locate the TIDs listed below.
Write down or print the minimum, maximum, and
current values for TID$2D, TID$2E, TID$2F,
TID$3E, and TID$29.
• Result from the EVAP FUNCTION TEST.
• If the system passed the test, include how many
times you ran the test and under what conditions.
• If you ran the function test several times, but the
system did not fail the test each time (for
example, it failed it once out of five tries), include
what components the HDS indicated should be
checked.
• Results from any additional testing you may have
done.
• Previous repair history for the vehicle (what was
repaired or replaced during earlier servicing).
• The date the last repair attempt was done (the
R.O. date of earlier repairs for the same DTC).
• Aftermarket accessories installed and dates of
installation (important if the installation could be
related to the EVAP system problem).
• Collision history (important if damage from the
collision could be related to the EVAP system
problem).
3. Select View> Diagnostic Services> Mode 6.
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