Acura RL (1996-2004 year). Manual — part 403
Emission Control System
Evaporative Emission (EVAP) Controls (cont'd)
'00 - 01 models:
From
No. 20 ECU (PCM)
(20 A) FUSE
(in the under-dash
fuse/relay box)
FUEL TANK VAPOR
RECIRCULATION
TUBE
EVAP
BYPASS
SOLENOID
VALVE
EVAP
CANISTER
FILTER
EVAP
CANISTER
FUEL TANK VAROR
RECIRCULATION
VALVE
EVAP
TWO WAY
VALVE
FUEL TANK
EVAP
CANISTER
VENT SHUT VALVE
EVAP CANISTER
PURGE VALVE
VARIOUS
SENSORS
INTAKE
MANIFOLD
FUEL
TANK
PRESSURE
SENSOR
FUEL TANK
VAPOR CONTROL
VALVE
FUEL
FILL
CAP
FUEL TANK
VAPOR
SIGNAL
TUBE
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('00 - 01 models) The scan tool indicates Diagnostic Trouble Code (DTC) P0451: The Fuel Tank Pressure (FTP)
sensor circuit range/performance problem.
The MIL has been reported on.
DTC P0451 is stored.
Check for the fuel tank pressure
sensor:
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 PCM connector ter-
minals D15 and D22.
Is there approx. 2.5 V?
YES
Check for the fuel tank pressure
sensor:
1. Disconnect the hose between
the EVAP two way valve and
the FTP sensor at the EVAP two
way valve end.
2. Connect a vacuum pump to
the open end of that hose.
3. Turn the ignition switch ON (II).
4. Monitor the FTP Sensor volt-
age with the Honda PGM
Tester, or measure voltage
between PCM connector ter-
minals D15 and D22, and care-
fully apply vacuum on the
hose one stroke at a time.
5. The voltage should smoothly
drop from the starting approx.
2.5 V down to approx. 1.5 V.
STOP applying vacuum when
the voltage drops to approx.
1.5 V or damage to the FTP
sensor may occur.
Does the voltage drop to approx.
1.5 V and hold?
YES
Intermittent failure, system is OK
at this time. Check for poor con-
nections or loose hose at fuel
tank pressure sensor and fuel
tank.
PCM CONNECTOR D (22P)
Wire side of female terminals
Check the vacuum lines for
restriction or blockage repair as
necessary. If OK, replace the fuel
tank pressure sensor.
VACUUM
PUMP/
GAUGE,
0 - 30 in.Hg
EVAP TWO-WAY
VALVE
Replace the fuel tank pressure
sensor.
NO
NO
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Emission Control System
Evaporative Emission (EVAP) Controls (cont'd)
The scan tool indicates Diagnostic Trouble Code (DTC) P0452: A low voltage problem in the Fuel Tank Pressure
(FTP) sensor.
The fuel tank pressure sensor converts fuel tank absolute pressure into electrical signals and inputs the PCM.
OUTPUT
VOLTAGE
(V)
The MIL has been reported on.
DTC P0452 is stored.
Check the vacuum lines:
Check the vacuum lines of the FTP
sensor for misrouting, 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 approx. 2.5 V?
NO
Check for an open in wire (VCC2
line):
1. Turn the ignition switch OFF.
2. Reinstall the fuel fill cap.
3. Disconnect the FTP sensor 3P
connector.
4. Turn the ignition switch ON (II).
5. Measure voltage between the
FTP sensor 3P connector ter-
minals No. 1 and No. 2.
Is there approx. 5 V?
YES
Repair or replace vacuum lines
as necessary.
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.
Repair open in the wire between
the fuel tank pressure sensor and
the PCM (D21).
PRESSURE
PCM CONNECTOR D (22P)
Wire side of female terminals
FUEL TANK
PRESSURE SENSOR
3P CONNECTOR (C319 (C674)»)
Wire side of female terminals
*: '00 - 01 models
YES
NO
NO
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Check for a short in the wire
(PTANK line):
Measure voltage between the FTP
sensor 3P connector terminals
No. 2 and No. 3.
FUEL TANK
PRESSURE SENSOR
3P CONNECTOR (C319 (C674)*)
PTANK
(GRN/YEL)
Is there about 5 V?
Replace the fuel tank pressure
sensor.
NO
Check for a short in the wire
{PTANK line):
1. Turn the ignition switch OFF.
2. Disconnect the PCM connec-
tor D (22P).
3. Check for continuity between
the FTP sensor connector No.
3 terminal and body ground.
PTANK
(GRN/YEL)
Is there continuity?
NO
Repair short in the wire between
the fuel tank pressure sensor and
PCM (D15).
Substitute a known-good PCM
and recheck (see page
for
immobilizer information). If nor-
mal FTP sensor is indicated,
replace the original PCM.
*: '00 - 01 models
YES
Wire side of female terminals
YES
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