Mitsubishi Galant 9G. Manual — part 1119
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-776
FUEL TANK
DIFFERENTIAL
PRESSURE
SENSOR
POWERTRAIN
CONTROL
MODULE
Fuel Tank Differential Pressure Sensor Circuit
AC306128
AC306248
B-20 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
B-20
CONNECTOR: B-20
PCM
AIR
CLEANER
AC305231
CONNECTOR: C-25
AM
C-25
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-777
.
CIRCUIT OPERATION
• The PCM (terminal 21) supplies a 5-volt refer-
ence voltage to the fuel tank differential pressure
sensor (terminal 3). The PCM (terminal 22) sup-
plies a ground to the fuel tank differential pres-
sure sensor (terminal 2).
• The PCM (terminal 23) receives a voltage signal
proportional to the pressure in the fuel tank from
the fuel tank differential pressure sensor (terminal
1).
.
TECHNICAL DESCRIPTION
• To determine whether the fuel tank differential
pressure sensor is defective, the PCM monitors
the fuel tank differential pressure sensor output
voltage.
• The PCM judges if the fuel tank differential pres-
sure sensor output voltage is normal.
NOTE: In rare cases, this DTC may be also set
under some fuel and driving conditions regardless of
the fuel pressure sensor output voltage when the fuel
system is clogged.
.
DESCRIPTIONS OF MONITOR METHODS
• Compare purge solenoid status with fuel tank dif-
ferential pressure sensor output voltage.
.
MONITOR EXECUTION
• Continuous.
.
MONITOR EXECUTION CONDITIONS
(OTHER MONITOR AND SENSOR)
Other Monitor (There is no temporary DTC stored
in memory for the item monitored below)
• Evaporative emission purge solenoid monitor
• Evaporative emission ventilation solenoid monitor
Sensor (The sensors below are determined to be
normal)
• Mass airflow sensor
• Barometric pressure sensor
• Intake air temperature sensor
• Engine coolant temperature sensor
• Accelerator pedal position sensor
.
AC305266
CONNECTOR: D-23
AB
D-23 (B)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-778
LOGIC FLOW CHARTS (Monitor Sequence)
.
DTC SET CONDITIONS
Check Conditions
• 2 seconds or more have passed since the start-
ing sequence was completed.
• The fuel temperature is 36°C (97°F) or less.
• Remaining fuel level is 85% or less when the
engine is started.
Judgment Criteria
• The fuel tank differential pressure sensor output
voltage remains 4.8 volt or greater for 5 seconds.
.
OBD-ll DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-ll Drive Cycle −
Procedure 1
− Evaporative Emission System Leak
Monitor
.
TROUBLESHOOTING HINTS (THE MOST
LIKELY CAUSES FOR THIS CODE TO BE
SET ARE:)
• Malfunction of the fuel tank differential pressure
sensor.
• Open or shorted fuel tank differential pressure
sensor circuit.
• Malfunction of the PCM.
.
AC401447
RANGE CHECK - MIN. / MAX.
NO
YES
CONTINUOUS
FAILURE FOR 5 SECS
START
END
NO
NO
NO
YES
YES
YES
MALFUNCTION
GOOD
MONITORING
CONDITIONS
OUTPUT VOLTAGE
< 1.0V
OUTPUT VOLTAGE
> 4.8V
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-779
OVERVIEW OF TROUBLESHOOTING
• DTC P0453 can be set by a faulty fuel tank differ-
ential pressure sensor or related circuit, or PCM
failure.
• To check for system blockage, do a performance
test which uses a mechanical vacuum gauge and
scan tool MB991958 set on the fuel tank differen-
tial pressure sensor (TANK PRS SNSR 73). The
mechanical gauge reading is used to verify scan
tool reading. A comparison of the mechanical
gauge with the reading on scan tool MB991958
will locate a problem in the system.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A
• MB991658: Test Harness Set
• MB991923: Power Plant ECU Check Harness
STEP 1. Using scan tool MB991958, check data list item 73:
Fuel Tank Differential Pressure Sensor.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Disconnect hose H from the evaporative emission canister,
and plug the hose.
(3) Turn the ignition switch to the "ON" position.
(4) Remove the fuel cap.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC306778
AC
HOSE H
PLUG
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