Acura RL (1996-2004 year). Manual — part 409
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Emission Control System
Evaporative Emission (EVAP) Controls (cont'd)
Does the voltage drop to 1.5 V
and hold at least 20 seconds?
NO
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
(ll).
4. While monitoring the FTP
Sensor voltage with the
Honda PGM Tester, or mea-
suring voltage between PCM
connector terminals 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 1.5 V.
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.
PURGE
LINE
CAP
VACUUM
PUMP/GAUGE, 0 - 30 in.Hg
PCM CONNECTOR D (22P)
Inspect the EVAP canister purge
valve line and connections. If
they are OK, do the EVAP two
way valve test (see page
).
Wire side of female terminals
Replace the EVAP canister.
NO
YES
YES
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Evaporative Emission (EVAP) Control Canister and EVAP
Control Canister Vent Shut Valve Replacement
'96 - 99 models
1. Remove the front bumper (see
).
2. Remove the EVAP control canister.
EVAP
CONTROL CANISTER
3. Remove the EVAP control canister vent shut valve.
EVAP
CANISTER
VENT
SHUT
VALVE
O-RING
Replace.
'00 - 04 models:
1. Disconnect the connector and hoses.
2. Remove the EVAP canister mounting bolt and the
EVAP canister.
MOUNTING
BOLT
EVAP
CANISTER
3. Remove the EVAP canister vent shut valve.
EVAP
CANISTER
VENT
SHUT
VALVE
O-RING
Replace.
COVER
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Emission Control System
Evaporative Emission (EVAP) Controls (cont'd)
Evaporative Emission (EVAP) Two Way Valve and EVAP
Bypass Solenoid Valve Replacement
'96 - 99 models:
O-RING
Replace.
'00 - 04 models:
O-RING
Replace.
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Fuel Tank Vapor Control Valve Test ('00-'04 model)
Float Test
1. Make sure the fuel tank is less than half full.
2. Remove the fuel fill cap to relieve the fuel tank pres-
sure, then reinstall the cap.
3. Remove the fuel hose joint protector. Disconnect
the fuel tank vapor recirculation tube, and connect a
vacuum pump to the vapor recirculation tube.
FUEL TANK VAPOR
RECIRCULATION
TUBE
PIPE
VACUUM PUMP/
GAUGE, 0 - 30 in.Hg
4. Plug the pipe.
5. Apply vacuum to the fuel tank vapor recirculation
tube.
• If the vacuum holds, replace the Fuel Tank Vapor
).
• If the vacuum does not hold, the float is OK.
Valve Test
1. Make sure the fuel tank is less than half full.
2. Remove the fuel fill cap.
3. Remove the fuel hose joint pretector. Disconnect
the fuel tank vapor signal tube.
FUEL TANK VAPOR
SIGNAL
TUBE
4. Disconnect the vacuum hose from the EVAP canis-
ter, and then plug the port with cap.
EVAP
CANISTER
VENT SHUT
VALVE
VACUUM
PUMP/GAUGE,
0 - 30 in.Hg
CAP
5. Disconnect the vacuum hose from the EVAP canis-
ter vent shut valve, and connect a vacuum pump to
the vacuum hose.
6. Pump the vacuum pump 80 times.
• If the vacuum holds, go to step 7.
• If the vacuum does not hold, go to step 9.
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