Acura RL (1996-2004 year). Manual — part 404
Emission Control System
Evaporative Emission (EVAP) Controls (cont'd)
The scan tool indicates Diagnostic Trouble Code (DTC) P0453: A high voltage problem in the Fuel Tank Pressure
sensor.
The MIL has been reported on.
DTC P0453 is stored.
Check the vacuum lines:
Check the vacuum lines of the
fuel tank pressure sensor for mis-
routing, leakage, breakage and
clogging.
Are the vacuum lines OK?
YES
Problem verification:
1. Do the PCM Reset Procedure.
2. Remove the fuel fill cap.
3. Turn the ignition switch ON (II).
4. Monitor the FTP sensor volt-
age with the Honda PGM
Tester, or measure voltage
between body ground and
PCM connector terminal D15.
Is there about 2.5 V?
NO
Check for an open in the wire
(SG2 line):
1. Turn the ignition switch OFF.
2. Reinstall the fuel fill cap.
3. Disconnect the fuel tank pres-
sure sensor 3P connector.
4. Turn the ignition switch ON (II).
5. Measure voltage between the
fuel tank pressure sensor 3P
connector terminals No. 1 and
No. 2.
Is there about 5 V?
YES
Check for a short in the wire
(PTANK line):
Measure voltage between the
fuel tank pressure sensor 3P con-
nector terminals No. 2 and No. 3.
(To page
Repair or replace vacuum lines
as necessary.
PCM CONNECTOR D (22P)
YES
Intermittent failure, system is OK
at this time. Check for poor con-
nections or loose wires at C417
(located near the under-dash
fuse/relay box), C319 (C674)*
(fuel tank pressure sensor) and
PCM.
Wire side of female terminals
FUEL TANK
PRESSURE SENSOR
3P CONNECTOR (C319 (C674)*)
Repair open in the wire between
the fuel tank pressure sensor and
PCM (D22).
*: '00 - 01 models
NO
Wire side of female terminals
NO
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Is there about 5 V?
Replace the fuel tank pressure
sensor.
NO
Check for an open in the wire
(PTANK line):
Measure voltage between PCM
connector terminals D15 and D22.
PCM CONNECTOR D (22P)
Is there about 5 V?
NO
Repair open in the wire between
the fuel tank pressure sensor and
the PCM (D15).
Wire side of female terminals
Substitute a known-good PCM
and recheck (see page
for
immobilizer information). If nor-
mal fuel tank pressure sensor is
indicated, replace the original
PCM.
YES
YES
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Emission Control System
Evaporative Emission (EVAP) Controls (cont'd)
The scan tool indicates Diagnostic Trouble Code (DTC) P1456: Evaporative Emission (EVAP) control system leak
detected (fuel tank system).
'96 - 99 models:
Troubleshooting Flowchart
The MIL has been reported on.
DTC P1456 is stored.
Check the fuel fill cap:
Check the fuel fill cap (the cap
must be a Honda cap and be
tightened at least three "clicks"
to properly seal the system).
Is the proper fuel fill cap installed
and properly tightened?
Fuel tank pressure sensor test.
Check the fuel tank pressure sensor:
1. Remove the fuel fill cap.
2. Turn the ignition switch ON (II).
3. Monitor the FTP Sensor volt-
age with the Honda PGM
Tester, or measure voltage
between PCM connector ter-
minals D15 and D22.
Is there about 2.5 V?
YES
Check the fuel tank pressure sen-
sor
1. Turn the ignition switch OFF.
2. Disconnect the hose between
the EVAP two-way valve and
the fuel tank pressure sensor at
the EVAP two-way valve end.
3. Connect a vacuum pump to the
open end of that hose.
4. Turn the ignition switch ON (II).
5. Monitor the FTP Sensor volt-
age with the Honda PGM
Tester, or measure voltage
between PCM connector termi-
nals D15 and D22, and carefully
pump vacuum on the hose one
stroke at a time.
6. The voltage should smoothly
drop from approx. 2.5 V down
to approx. 1.5 V. Stop applying
vacuum when the voltage
drops to approx. 1.5 V or dam-
age to the fuel tank pressure
sensor may occur.
Replace the fuel fill cap (gray col-
ored cap.
NO
Fuel fill cap is OK. Do the fuel
tank pressure sensor test.
PCM CONNECTOR D (22P)
Replace the fuel tank pressure
sensor.
Wire side of female terminals
VACUUM
PUMP/
GAUGE,
0 - 30 in.Hg
EVAP TWO-WAY
VALVE
NO
Replace or tighten the cap.
NO
YES
YES
Check the fuel fill cap seal:
Check the fuel fill cap seal.
Is the fuel fill cap seal missing or
damaged?
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Dose the voltage drop to
approx. 1.5 V and hold?
NO
Replace the fuel tank pressure
sensor.
EVAP purge control solenoid
valve test.
Check the EVAP purge control
solenoid valve:
1. Disconnect the vacuum hose
from the EVAP purge control
solenoid valve, and connect a
hose and a vacuum pump to
the EVAP purge control
solenoid valve.
2. Turn the ignition switch ON (II).
3. Apply vacuum to the hose.
Dose the valve hold vacuum?
NO
Check the EVAP purge control
solenoid valve:
1. Turn the ignition switch OFF.
2. Disconnect the EVAP purge
control solenoid valve 2P con-
nector.
3. Check for continuity between
the EVAP purge control
solenoid 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 purge control
solenoid 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.
Fuel tank pressure sensor is OK.
Do the EVAP purge control
solenoid valve test.
EVAP purge control solenoid
valve is OK. Do the EVAP bypass
solenoid valve test (see page 11-
184).
EVAP PURGE CONTROL SOLENOID
VALVE 2P CONNECTOR (C127)
Replace the EVAP purge control
solenoid valve.
Repair short in the wire between
PCM (A23) and EVAP purge con-
trol solenoid valve.
Wire side of
female
terminals
YES
YES
NO
YES
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