B99-040

(IDACURA
Applies To:
Service Bulletin
99-040~
See VEHICLES AFFECTED
December 8, 2015
Troubleshooting DTC P1456 and P1457
(Supersedes 99-040, dated August 9, 2013, 1999, to revise the information marked by the black bars)
(Replaces 99-039, Diagnosing DTC P1456 and DTC P1457)
VEHICLES AFFECTED
PROCEDURE A
(Applies to: 2001-04 MDX, 1997---05 NSX, 1996-04 RL,
and 1999-03 TL)
1997-03 CL
1996-01 Integra
2001-04MDX
1997-05 NSX
1996-04 RL
1999-03 TL
This bulletin updates the troubleshooting procedures
for DTC Pl456 (EVAP control system leakage [Fuel
tank system]) and DTC Pl457 (EVAP control system
leakage[EVAP canister system]). Depending on the
model, there are two individual procedures in this
bulletin. Procedure A applies to 2001-04 MDX, 199705 NSX, 1996---04 RL, and 1999---03 TL. Procedure B
applies to 1997---03 CL, and 1996---01 Integra.
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.
1. Check the FTP (fuel tank pressure) sensor value.
• Connect the HDS.
In the event you need to call Tech Line or have a
comeback, refer to the last section of this bulletin,
HANDLING A COMEBACK.
• Tum the ignition switch to ON (II) but leave the
engine off.
Troubleshooting of Pl456 for MDX, NSX, RL,
and TL
Page 1
Troubleshooting of Pl457 for MDX, NSX, RL,
and TL
Page 5
Troubleshooting of Pl456 for CL, and Integra
Page 11
Troubleshooting of Pl457 for CL, and Integra
Page 15
• 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 ifit 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 Pl 456. 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.
© 2013 American Honda Motor Co., Inc. -All Rights Reserved
Skill Level
R
REPAIR
BTB 20978-02966 Version 4
1 of20
CLIENT 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
Acura automobile dealer.
3.
Check the FTP sensor value on the HDS with the
fuel cap removed.
• Connect a vacuum pump to the canister side
two-way valve hose.
Is the value 2.45 V-2.55 V?
Yes -The FTP sensor is reading correctly.
Go to step 4.
BPS VALVE
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.
• 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 tum ON the BPS valve.
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Did the vacuum bleed offwhen 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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99-040
5. Test the EVAP two-way valve.
• Make sure the BPS valve is still commanded ON
with the HDS.
• Reconnect the vacuum pump.
• Cap the open hose fitting on the two-way valve.
BPS VALVE
• Enter the HDS PGM-FI menu, and select
INSPECTION> EVAP TEST>
SINGLE SOLENOID> BYPASS SOLENOID.
Click the green check box to tum 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.
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• Watch the FTP sensor value on the HDS for
20 seconds.
Did the value increase more than 0.05 Vin
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.
• 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 Vin
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.
99-040
3 of20
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.
Plug the fuel
tank vapor
control valve
hose.
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.
• 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 Vin
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 Vin
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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99-040
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 ofleaks. 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
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.
• Tum the ignition switch to ON (11), 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.
• 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.
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
Pl456 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.
99-040
5 of20
2.
Test for canister side leaks.
• Attach a vacuum pump to the engine side of the
PCS valve.
• Leave the fuel cap off.
• Pinch the hose between the two-way valve and
the fuel tank.
PCS VALVE
• Enter the HDS PGM-FI menu, and select
INSPECTION> EVAP TEST> MULTI
SOLENOIDS> PCS ON> CVS ON> BPS ON .
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• Make sure that you can hear and feel all of the
solenoids operate.
PCS VALVE
V6Mode/s
PCS VALVE
6 of20
99-040
• Apply vacuum to the system while monitoring the
FTP sensor value on the HDS. Stop when the
value reads approximately 1.50 V.
• Apply vacuum to the system while monitoring the
FTP sensor value reading 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.
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 Vin
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.
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.
• Enter the HDS PGM-FI menu, and select
INSPECTION> EVAP TEST>MULTI
SOLENOIDS> PCS ON> CVS ON> BPS ON.
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7 of20
• Enter the HDS PGM-FI menu, select
INSPECTION> EVAP TEST> MULTI
SOLENOIDS> PCS ON> CVS ON> BPS ON.
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Test the two-way valve and BPS (bypass solenoid)
valve.
• Remove the vacuum pump, reconnect the hoses,
and remove the clamping pliers.
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• Enter the HDS PGM-FI menu, and select
INSPECTION> EVAP TEST> SINGLE
SOLENOID> BYPASS SOLENOID. Click the
green check box to tum ON the BPS valve.
.
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• Apply vacuum to the system while monitoring the
FTP sensor value reading on the HDS. Stop
when the value reads approximately 1.50 V.
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• 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
PCS VALVE
• Watch the value on the HDS for 20 seconds.
Did the value increase more than 0.05 Vin
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.
• 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).
8 of20
99-040
• Watch the value on the HDS for 20 seconds.
Did the value increaw more than 0.05 Vin
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
• 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 Vin
20 seconds?
Yes - The FTP sensor or hose is leaking.
Replace the FTP sensor and hose. Go to step 9.
• Enter the HDS PGM-FI menu, and select
INSPECTION> EVAP TEST> MULTI
SOLENOIDS> PCS ON> CVS ON> BPS ON.
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No - The two-way valve and BPS valve
assembly are leaking. Replace the two-way
valve and BPS valve assembly. Go to step 9.
1?1
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• 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 Vin
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.
99-040
9 of20
8.
Test the purge hose.
• Enter the HDS PGM-FI menu, and select
INSPECTION> EVAP TEST> MULTI
SOLENOIDS. PCS ON> CVS ON> BPS ON.
• Leave the fuel tank vapor control hose
disconnected from the canister but make sure it
is still plugged.
.
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• Leave the hose between the two-way valve and
the fuel tank pinched.
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• Reconnect the purge hose to the canister.
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• 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 Vin
20 seconds?
Yes -The purge hose/line is leaking. Replace
the purge hose/line that is leaking. Go to step 9.
• Disconnect the purge hose from the PCS valve
that leads to the canister, and connect the
vacuum pump.
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 Helie vacuum gauge to the PCS
valve.
PCS VALVE
10 of20
99-040
PROCEDUREB
• Start the engine.
(Applies to: 1997-03 CL, and 1996-01 Integra)
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.
1.
Check the FTP (fuel tank pressure) sensor value.
• Connect the HDS.
• Tum the ignition switch to ON (II) but leave the
engine off.
PCS VALVE
• Go to PGM_FI, select Data List, and find
FTP SENSOR
Does the vacuum gauge show vacuum?
Yes - The PCS valve is leaking. Replace the
PCS valve. Go to step 10.
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 - No leak has been found in the system.
Go to step 10.
I
NOTE: Make sure the purge canister is receiving at
least 15 inHg of vacuum.
No -The system is at atmospheric pressure,
there is a leak in the system. Go to step 2.
2.
10. Confirm the repair.
• Clear the PGM-FI DTCs with the HDS.
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.
• Short the SCS connector with the HDS.
• In the electronic service manual, search for
Pl457 Advanced Diagnostics. Review the
enable conditions for the monitor to run.
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
Pl 456. Ifno damage is found leave the fuel cap
off. Go to step 3.
• 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.
No - If the cap is loose, tighten the cap at least
three clicks to properly seal the system. Go to
step 10.
NOTE: If a leak is still present, contact Tech Line.
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.
99-040
11 of20
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.
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.
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.
HOSE TO
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).
• Disconnect the electrical connector from the BPS
valve.
• Disconnect the vacuum pump.
• Apply about 5 in.Hg of vacuum to the system.
• Watch the FTP sensor value on the HDS for 20
seconds.
• Enter HDS PGM-FI menu, and select
INSPECTION> EVAP TEST> SINGLE
SOLENOID> BYPASS SOLENOID. Click the
green check box to tum ON the BPS valve.
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Did the value increase more than 0.05 Vin 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.
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No -The two-way valve and BPS valve
assembly are not leaking. Go to step 6.
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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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99-040
6.
Test the fuel tank.
7.
Test the fuel tank vapor control valve.
• Make sure the BPS valve is still commanded ON
with the HDS.
• Make sure the BPS valve is still commanded ON
with the HDS.
• Reconnect the BPS valve connector.
• Disconnect the fuel tank vapor control valve hose
from the canister, and plug the opening.
• Reconnect the two-way valve hose coming from
the fuel tank.
• Reconnect the vacuum pump.
• 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 Vin 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.
99-040
• 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 Vin 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.
13 of20
8.
Isolate the fuel fill neck and fuel cap.
• Make sure the BPS valve is still commanded ON
with the HDS.
9.
Isolate the fuel tank area leak.
• Reconnect all of the hoses that are
disconnected.
• 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.
• Watch the FTP sensor value on the HDS, apply
vacuum until the value reads approximately
2.10 V.
• 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 Vin 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.
99-040
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
Pl456 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.
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.
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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.
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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.
Check FTP (fuel tank pressure) sensor value.
• Remove the fuel cap.
• Connect the HDS.
• Tum the ignition switch to ON (11), 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.
• 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 Vin
20 seconds?
Yes - There is a leak in the system. Go to step 3.
No - The system is not leaking. Go to step 8.
99-040
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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.
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Rear of vehicle.
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• 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.
EVAP
CANISTER
• Watch the value on the HDS for 20 seconds.
Did the value increase more than 0.05 Vin 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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99-040
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 tum ON the BPS valve.
• Watch the value on the HDS for 20 seconds.
Did the value increase more than 0.05 Vin 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 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.
• 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 Vin 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.
• 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).
• Reconnect any disconnected hoses.
• Pinch the hose between the two-way valve and
the fuel tank.
• Watch the value on the HDS for 20 seconds.
Rear of vehicle.
Did the value increase more than 0.05 Vin 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
• Disconnect the purge hose from the canister and
connect a vacuum pump to the canister fitting.
Front of vehicle
• 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.
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99-040
• Enter the HDS PGM-FI menu, and select
INSPECTION> EVAP TEST> MULTI
SOLENOIDS. PCS ON> CVS ON> BPS ON.
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8.
• Disconnect the hose leading to the PCS valve
from the canister.
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• Connect a Mini Helie vacuum gauge to the PCS
valve hose.
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Test the PCS valve.
• Reconnect all of the hoses disconnected.
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• 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 Vin 20
seconds?
Yes - The purge hose/line is leaking. Replace
the purge hose/line that is leaking. Go to step 9.
PCS VALVE
No - The purge hose/line is not leaking.
Go to step 8.
• 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.
NOTE: Make sure the purge canister is receiving at
least 15 inHg of vacuum.
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
Pl457 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.
99-040
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I
HANDLING A COMEBACK
4. Locate the TIDs listed below.
If the vehicle comes back to your dealership more than
twice for the same DTC (either Pl456 or Pl457), 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.
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.
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• Results from any additional testing you may have
done.
• Previous repair history for the vehicle (what was
repaired or replaced during earlier servicing).
2.
Connect the scan tool interface device to the
vehicle, and select Connect.
.
• Aftermarket accessories installed and dates of
installation (important if the installation could be
related to the EVAP system problem).
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3.
• The date the last repair attempt was done (the
RO. date of earlier repairs for the same DTC).
• Collision history (important if damage from the
collision could be related to the EVAP system
problem).
Select View> Diagnostic Services> Mode 6.
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99-040