Acura RL (1996-2004 year). Manual — part 408
Emission Control System
Evaporative Emission (EVAP) Controls (cont'd)
'00 - 01 models:
Troubleshooting Flowchart
The MIL has been reported on.
DTC P1457 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
Check for an open in the wire
(IG1 line):
1. Turn the ignition switch ON (II).
2. Measure voltage between the
EVAP bypass solenoid valve 2P
connector terminal No. 2 and
body ground.
PCM CONNECTOR A (26P)
JUMPER
WIRE
EVAP canister purge valve is OK.
Do the EVAP bypass solenoid
valve test (see page
).
Repair open in the wire between
the EVAP canister purge valve
and PCM (A23).
NO
Wire side of
female
terminals
NO
EVAP CANISTER PURGE
VALVE 2P CONNECTOR (C127)
Wire side of
female
terminals
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Is there battery voltage?
NO
Repair open in the wire between
the EVAP canister purge valve
and No. 20 ECU (PCM) (20 A)
fuse.
EVAP bypass solenoid valve test.
Check the EVAP bypass solenoid
valve:
1. Disconnect the vacuum hose
from the EVAP two way valve,
and connect a vacuum pump
to the hose.
2. Turn the ignition switch ON (II).
3. Apply vacuum to the hose.
Dose the valve hold vacuum?
NO
Check the EVAP bypass solenoid
valve:
1. Turn the ignition switch OFF.
2. Disconnect the EVAP bypass
solenoid valve 2P connector.
3. Check for continuity between
the EVAP bypass solenoid
valve 2P connector terminal
No. 2 and body ground.
Is there continuity?
YES
Check for a short in the wire
(2WBS line):
1. Disconnect the PCM connec-
tor F (8P).
2. Check for continuity between
the EVAP bypass solenoid
valve 2P connector terminal
No. 2 and body ground.
Is there continuity?
NO
Substitute a known-good PCM
and recheck (see page
for
immobilizer information). If
symptom/indication goes away,
replace the original PCM.
Replace the EVAP canister purge
valve.
EVAP TWO-WAY
VALVE
VACUUM
PUMP/
GAUGE,
0 - 30 in.Hg
EVAP
BYPASS
SOLENOID
VALVE
EVAP bypass solenoid valve/EVAP
two-way valve is OK. Do the EVAP
canister vent shut valve test (see
page
). EVAP BYPASS SOLENOID
VALVE 2P CONNECTOR (C675)
Wire side of
female
terminals
Replace the EVAP bypass solenoid
valve and O-rings.
Repair short in the wire between
PCM (F1) and EVAP bypass
solenoid valve.
O-RING
Replace.
NO
YES
YES
YES
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Emission Control System
Evaporative Emission (EVAP) Controls (cont'd)
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
PCM CONNECTOR F (8P)
JUMPER WIRE
EVAP
CANISTER
EVAP canister vent shut valve is
OK. Do the canister system leak
).
Wire side of female
terminals
EVAP
CANISTER VENT SHUT
VALVE 2P CONNECTOR (C673)
Wire side of female terminals
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.
YES
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.
YES
Is there continuity?
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.
NO
YES
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.
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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 Honda
PGM Tester, or measuring volt-
age between PCM connector
terminals 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 1.5 V.
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 Honda
PGM Tester, or measuring volt-
age 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.
CAP
EVAP
CANISTER
EVAP
CANISTER
VENT
SHUT
VALVE
TEE
FITTINGS
EVAP TWO WAY
VALVE
VACUUM
PUMP/
GAUGE,
0 - 30 In.Hg
PCM CONNECTOR 0 (22P)
Inspect the EVAP canister vent
shut valve line and connections.
Wire side of female terminals
FUEL TANK VAPOR
VENT TUBE
CAP
YES
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