Acura RL (1996-2004 year). Manual — part 279
Does the valve hold vacuum?
Is there battery voltage?
NO
Repair open in the wire between
the EVAP canister vent shut
valve and No. 20 ECU (PCM) (20
A)fuse.
VACUUM
PUMP/GAUGE, 0-30 in.Hg
EVAP canister vent shut valve is
OK. Do the canister system leak
NO
Repair open in the wire between
the EVAP canister vent shut
valve and PCM (F5).
Replace the EVAP canister vent
shut valve and O-ring.
EVAP canister vent shut valve
test.
Check the EVAP canister vent
shut valve:
1. Disconnect the vacuum hose
and connect a vacuum pump
to the hose.
2. Connect the PCM connector
terminal F5 to the body ground
with a jumper wire.
3. Turn the ignition switch ON (II).
4. Apply vacuum to the hose.
Is there continuity?
Check for an open in the wire
(IG1 line):
1. Turn the ignition switch ON (II).
2. Measure voltage between the
EVAP canister vent shut valve
2P connector terminal No. 1
and body ground.
Check for an open in the wire
(VSV line):
1. Turn the ignition switch OFF.
2. Disconnect the EVAP canister
vent shut valve 2P connector.
3. Check for continuity between
the EVAP canister vent shut
valve 2P connector terminal
No. 2 and body ground.
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Emission Control System
Evaporative Emission (EVAP) Controls (cont'd)
Canister system leak test.
Check the EVAP canister vent
shut valve line and connections:
1. Turn the ignition switch OFF.
2. Connect to three-way tee fit-
tings into the hose from the
EVAP canister to the EVAP two
way valve. Connect the fuel
tank pressure sensor to one of
the tee fittings and the vacuum
pump to the other.
3. Remove the vent hose from
the EVAP canister vent shut
valve and cap the port to seal
the fresh air vent for the EVAP
canister.
4. Turn the ignition switch ON (II).
5. While monitoring the FTP
Sensor voltage with the HDS or
the scan tool, or measuring volt-
age between PCM connector ter-
minals D15 and D22 slowly
pump the vacuum pump using a
stroke every 1-2 seconds.
6. Continue to pump vacuum
until that voltage drops to
about 1.5V.
NOTE: Make sure that the
engine coolant temperature
still above 95°F (35°C) and your
vacuum pump has no leak.
7. Monitor that voltage for 20
seconds.
Does the voltage drop to 1.5 V
and holds at least 20 seconds?
NO
Check the EVAP control Fuel tank
vapor vent line and connections:
1. Turn the ignition switch OFF.
2. Disconnect the Fuel tank vapor
vent tube from the EVAP can-
ister and plug the port.
3. Turn the ignition switch ON (II).
4. While monitoring the FTP
Sensor voltage with the HDS or
the scan tool, or measuring volt-
age between PCM connector ter-
minals D15 and D22 slowly
pump the vacuum pump using a
stroke every 1 - 2 seconds.
5. Continue to pump vacuum
until that voltage drops to
about 1.5V.
NOTE: Make sure that the
engine coolant temperature
still above 95°F (35°C) and your
vacuum pump has no leak.
6. Monitor that voltage for 20
seconds.
CAP
EVAP
CANISTER
EVAP
CANISTER
VENT
SHUT
VALVE
VACUUM PUMP/GAUGE,
0 - 30 In.Hg
TEE
FITTINGS
EVAP TWO
WAY
VALVE
Inspect the EVAP canister vent
shut valve line and connections.
FUEL TANK VAPOR
VENT TUBE
CAP
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Does the voltage drop to 1.5 V
and hold at least 20 seconds?
Check the EVAP canister purge
valve line and connections:
1. Turn the ignition switch OFF.
2. Disconnect the Purge line
hose from the EVAP canister
and plug the port.
3. Turn the ignition switch ON
(II).
4. While monitoring the FTP
Sensor voltage with the HDS
or the scan tool, or measuring
voltage between PCM con-
nector terminals D15 and D22
slowly pump the v a c u u m
pump using a stroke every 1 -
2 seconds.
5. Continue to pump vacuum
until that voltage drops to
about 1.5V.
NOTE: Make sure that the
engine coolant temperature
still above 95°F (35°C) and your
vacuum pump has no leak.
6. Monitor that voltage for 20
seconds.
Does the voltage drop to 1.5 V
and holds at least 20 seconds?
Inspect the fuel tank vapor vent
line and connections.
Inspect the EVAP canister purge
valve line and connections. If
they are OK, do the EVAP two
way valve test (see page
).
(cont'd)
11-101
VACUUM
PUMP/GAUGE, 0-30 in.Hg
Replace the EVAP canister.
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Emission Control System
Evaporative Emission (EVAP) Controls (cont'd)
The scan tool indicates Diagnostic Trouble Code (DTC) P0497: Evaporative Emission (EVAP) system low purge
flow.
Troubleshooting Flowchart
— The MIL has been reported on.
— DTC P0497 is stored.
Check the EVAP canister purge
valve:
1. Disconnect the vacuum hose
from the EVAP canister purge
valve, and connect a hose and
a vacuum pump to the EVAP
canister purge valve.
2. Connect the PCM connector
terminal A23 to the body
ground with a jumper wire.
3. Turn the ignition switch ON (II).
4. Apply vacuum to the hose.
Dose the valve hold vacuum?
YES
Check for an open in the wire
(PCS line):
1. Turn the ignition switch OFF.
2. Disconnect the EVAP canister
purge valve 2P connector.
3. Check for continuity between
the EVAP canister purge valve
2P connector terminal No. 1 and
body ground.
Is there continuity?
YES
EVAP canister purge valve is OK.
Do the EVAP canister vent shut
valve test (see page
Repair open in the wire between
the EVAP canister purge valve
and PCM (A23).
Check for an open in the wire
(IG1 line):
1. Turn the ignition switch ON (II).
2. Measure voltage between the
EVAP canister purge valve 2P
connector terminal No. 2 and
body ground.
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