Mitsubishi Galant (2004+). Manual — part 957
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-645
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) <2.4L ENGINE>
13A-646
.
CIRCUIT OPERATION
• The PCM (terminal 21) supplies a 5-volt refer-
ence signal to the fuel tank differential pressure
sensor (terminal 3). The fuel tank differential
pressure sensor (terminal 2) is grounded through
the PCM (terminal 22).
• The fuel tank differential pressure sensor (termi-
nal 1) returns a voltage signal to the PCM (termi-
nal 23) that is proportional to the pressure in the
fuel tank.
.
TECHNICAL DESCRIPTION
• The PCM monitors the fuel tank differential pres-
sure sensor signal voltage.
• The PCM determines whether the fuel tank differ-
ential pressure sensor signal voltage is within
normal operating parameters.
.
DESCRIPTIONS OF MONITOR METHODS
• Detect malfunction if change of fuel tank differen-
tial pressure sensor output voltage during idling
stays large during specified go/stop operations.
.
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
.
AC305266
CONNECTOR: D-23
AB
D-23 (B)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-647
LOGIC FLOW CHARTS (Monitor Sequence)
.
DTC SET CONDITIONS
Check Conditions
• Throttle valve is closed.
• Vehicle speed is 1.5 km/h (0.93 mph) or less.
Judgment Criteria
• If the voltage signal from the fuel tank differential
pressure sensor changes by 0.2 volt or more,
DTC P0451 will set. The code may also set if a
sudden pressure fluctuation occurs twenty times
while the engine is idling, and then eight consec-
utive times during normal driving.
START
YES
NO
NO
OFF-IDLING CONDITION
IDLING CONDITION?
F1 = 0
END
NO
NO
YES
YES
MALFUNCTION
F1 > 20
SPECIFIED TIMES
MONITORED
FTPS OUTPUT
VOLTAGE > 0.2V
FLUCTUATION
NO
YES
YES
F1 = F1 + 1
GOOD
YES
NO
OFF-IDLING CONDITION
AC306647
RATIONALITY - NOISE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-648
NOTE: If the number of sudden pressure fluctua-
tions does not reach twenty during any one
period of engine idling, or if the ignition switch is
turned OFF, the counter will reset to zero.
NOTE: The conditions for deviating from idling
operation are as follows:
.
•
Engine speed is greater than 2,500 r/min.
•
Vehicle speed is 15 km/h (9.3 mph) or
greater.
•
Volumetric efficiency is 55 percent or greater.
.
OBD-ll DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-ll Drive Cycle −
Procedure 1
− Evaporative Emission System Leak
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• Malfunction of the fuel tank differential pressure
sensor.
• A damaged harness in the fuel tank differential
pressure sensor circuit.
• Malfunction of the PCM.
.
OVERVIEW OF TROUBLESHOOTING
• DTC P0451 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 MB991958 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
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст