Acura RL (1996-2004 year). Manual — part 406
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Emission Control System
Evaporative Emission (EVAP) Controls (cont'd)
Dose the valve hold vacuum?
NO
Check the EVAP canister purge
valve:
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 a short in the wire (PCS
line):
1. Disconnect the PCM connector
A (26P).
2. Check for continuity between
the EVAP canister purge valve
2P connector terminal No. 1
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.
EVAP canister purge valve is OK.
Do the EVAP bypass solenoid
valve test (see page
).
Replace the EVAP canister purge
valve.
EVAP CANISTER PURGE
VALVE 2P CONNECTOR (C127)
Repair short in the wire between
PCM (A23) and EVAP canister
purge valve.
YES
NO
Wire side of
female
terminals
YES
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. Turn the ignition switch ON (II).
3. Apply vacuum to the hose.
EVAP canister purge valve test.
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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. Connect the PCM connector
terminal F1 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?
Is there battery voltage?
EVAP TWO-WAY
VALVE
PCM CONNECTOR F (8P)
EVAP
BYPASS
SOLENOID
VALVE
Wire side of
female
terminals
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)
NO
Repair open in the wire between
the EVAP bypass solenoid valve
and PCM (F1).
Replace the EVAP bypass solenoid
valve and O-rings.
O-RING
Replace.
YES
NO
YES
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 bypass solenoid valve
2P connector terminal No. 1
and body ground.
Wire side of
female
terminals
NO
YES
Check for an open in the wire
(2WBS line):
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.
JUMPER
WIRE
VACUUM
PUMP/
GAUGE,
0 - 30 in.Hg
Repair open in the wire between
the EVAP bypass solenoid valve
and No. 20 ECU (PCM) (20 A).
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Emission Control System
Evaporative Emission (EVAP) Controls (cont'd)
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. Turn the ignition switch ON (II).
3. Apply vacuum to the hose.
Dose the valve hold vacuum?
YES
Check the EVAP canister vent shut
valve:
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.
Is there continuity?
YES
Check for an short in the wire
(VSV line):
1. Disconnect the PCM connec-
tor F (8P).
2. Check for continuity between
the EVAP canister vent shut
valve 2P connector terminal
No. 2 and body ground.
EVAP
CANISTER
EVAP canister vent shut valve is
OK. Do the vacuum hoses and
connections test (see page
).
VACUUM
PUMP/GAUGE, 0 - 30 in.Hg
EVAP CONTROL
VENT SHUT
VALVE 2P CONNECTOR (C673)
Wire side of female terminals
Replace the EVAP canister vent
shut valve and O-ring.
Is there continuity?
Repair short in the wire between
PCM (F5) and EVAP canister vent
shut valve.
NO
Substitute a known-good PCM
and recheck (see page
for
immobilizer information). If
symptom/indication goes away,
replace the original PCM.
YES
NO
NO
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Are the parts OK?
Repair or replace the parts.
YES
Substitute a known-good PCM
and recheck (see page
for
immobilizer information). If
symptom/indication goes away,
replace the original PCM.
NO
Check the vacuum hoses and con-
nections:
Check following parts for leakage
to atmosphere (see page
).
• Fuel tank
• Fuel fill cap
• Fuel fill pipe
• Fuel tank vapor control valve
• Fuel tank vapor recirculation
valve
• Fuel tank vapor recirculation
tube
• Fuel tank vapor signal tube
• Fuel tank vapor vent tube
• EVAP two way valve
• Fuel tank pressure sensor
Vacuum hoses and connections
test.
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