Mitsubishi Eclipse. Manual — part 256
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-517
NOTE: Check harness after checking intermediate connectors
D-16, C-90 and C-28. If intermediate connectors are damaged,
repair or replace them. Refer to GROUP 00E, Harness Con-
nector Inspection
. Then go to Step 12.
Q: Is the harness wire in good condition?
YES : Replace the ECM or PCM. Then go to Step 12.
NO : Repair it. Then go to Step 12.
STEP 12. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− OBD-II Drive Cycle − Procedure 6 −
Other Monitor
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0446 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0451: Evaporative Emission Control System Pressure Sensor Range/Performance
AC001943
A
B
C
EVAPORATIVE EMISSION
PURGE SOLENOID
EVAPORATIVE
EMISSION CANISTER
EVAPORATIVE
EMISSION
VENTILATION
SOLENOID
FUEL TANK
CHECK VALVE A
CHECK
VALVE B
INTAKE MANIFOLD
SYSTEM DIAGRAM
D
E
F
G
I
H
L
N
M
K
J
O
P
CHAMBER
AC
FUEL TANK DIFFRENTIAL
PRESSURE SENSOR
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-518
Fuel Tank Differential Pressure Sensor Circuit
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-519
.
CIRCUIT OPERATION
• A 5-volt voltage is supplied to the power terminal
of the fuel tank differential pressure sensor (ter-
minal 3) from the ECM (terminal 81) <M/T> or
PCM (terminal 46) <A/T>. The ground terminal
(terminal 2) is grounded with the ECM (terminal
92) <M/T> or PCM (terminal 57) <A/T>.
• A voltage proportional to the pressure in the fuel
tank is sent from the output terminal of the fuel
tank differential pressure sensor (terminal 1) to
the ECM (terminal 61) <M/T> or PCM (terminal
92) <A/T>.
.
TECHNICAL DESCRIPTION
• To judge if the fuel tank differential pressure sen-
sor is defective, the ECM <M/T> or PCM <A/T>
monitors the fuel tank differential pressure sensor
output voltage.
• Based on the test conditions and judgment crite-
ria, the ECM <M/T> or PCM <A/T> judges if the
fuel tank differential pressure sensor output volt-
age is normal.
.
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
AC001741 AJ
CONNECTOR: C-28
AC001689
CONNECTORS: C-56, C-60<M/T>,
C-54, C-57 <A/T>
ECM <M/T>
OR
PCM <A/T>
AK
C-60
<M/T>
C-56 <M/T>,
C-57<A/T>
C-54
<A/T>
AC001991
CONNECTOR: C-90
CONNECTOR
BLOCK (LH)
AI
AC001787AD
CONNECTOR: D-16
AC103356
FUEL TANK
AD
CONNECTOR: D-18
FUEL TANK DIFFERENTIAL
PRESSURE SENSOR
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-520
Sensor (The sensors below are determined to be
normal)
• Volme airflow sensor
• Barometric pressure sensor
• Intake air temperature sensor
• Engine coolant temperature sensor
.
LOGIC FLOW CHARTS (Monitor Sequence)
.
DTC SET CONDITIONS
Test Conditions: Electrical noise
• Throttle valve is closed.
• Vehicle speed is 1.5 km/h (0.9 mph) or less.
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
AC210307
RATIONALITY - NOISE
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