Mitsubishi Galant 9G. Manual — part 1131
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-824
STEP 13. Check the evaporative emission canister for
vacuum leaks.
(1) Remove the evaporative emission canister (Refer to
GROUP 17, Evaporative Emission Canister and Fuel Tank
Pressure Relief Valve
(2) Connect a hand vacuum pump to the evaporative emission
canister and plug the other nipples.
(3) Apply a pressure on the hand vacuum pump, and confirm
that air is maintained.
(4) Disconnect the hand vacuum pump and remove the plugs,
and then install the evaporative emission canister (Refer to
GROUP 17, Evaporative Emission Canister and Fuel Tank
Pressure Relief Valve
Q: Is the evaporative emission canister in good condition?
YES : Go to Step 14.
NO : Replace the evaporative emission canister (Refer to
GROUP 17, Evaporative Emission Canister and Fuel
Tank Pressure Relief Valve
). Then go to Step
AC305682
AB
PLUGS
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-825
STEP 14. Using scan tool MB991958, check the
evaporative emission system monitor test.
CAUTION
• To prevent damage to scan tool MB991958, always turn
the ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991958.
• During this test, the PCM automatically increases the
engine speed to 1,600 r/min or greater. Check that the
transaxle is set to the "P" position.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Erase the DTCs using scan tool MB991958.
(4) Check that the fuel cap is securely closed (Tighten until
three clicks are heard).
(5) Start the engine.
(6) Select "System Test."
(7) Select "Evap Leak Mon."
(8) During the test, keep the accelerator pedal at the idle
position.
(9) Keep the engine speed and engine load within the specified
range. When the monitor test starts, the "In Progress" item
on scan tool MB991958 will change from "NO" to "YES."
(10)Turn the ignition switch to the "LOCK" (OFF) position.
Disconnect scan tool MB991958.
Q: Is "Evap Leak Mon. Completed. Test Failed and DTCs
Set" displayed on scan tool MB991958?
YES : Replace the PCM (Refer to
). Then go to
Step 15 .
NO <"Evap Leak Mon. Completed. Test Passed" is
displayed on scan tool MB991958.> : The evaporative
emission system is working properly at this time. Go
to Step 15 .
NO <"Evap Leak Mon. Discontinued. Retest again from
the first" is displayed on scan tool MB991958.> : The
EVAP monitor has been interrupted during the test.
Turn the ignition switch to the "LOCK" (OFF) position
once, and repeat the monitoring from Step 14.
STEP 15. Perform the OBD-II drive cycle.
(1) Confirm the repair by performing the appropriate drive cycle
(Refer to Diagnostic Function
− OBD-ll Drive Cycle −
Procedure 1
− Evaporative Emission System Leak Monitor
).
(2) Read the DTC.
Q: Is DTC P0456 set?
YES : Repeat the troubleshooting from Step 1.
NO : The procedure is complete.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-826
DTC P0461: Fuel Level Sensor (main) Circuit Range/Performance
1
2 3
4
5
22
21
23 24 25
26 27 28 29
30 31 32 33 34
35 36 37 38
39 40 41 42 43
1
2
AK400894
Fuel Level Sensor Circuit
FUEL LEVEL
SENSOR (SUB)
FUEL LEVEL SENSOR (MAIN)
(INTEGRATED IN FUEL PUMP MODULE)
13
2
1
2
1
11
PINK-
BLA
CK
BLA
CK
PINK-
BLACK
PINK-
BLA
CK
PINK-BLA
CK
24
GRA
Y
GRA
Y
POWERTRAIN
CONTROL
MODULE (PCM)
C-28
C-25
D-18
(MU802058)
D-17
CONBINATION METER
B-20
AK303875AB
CONNECTOR: D-17
FUEL LEVEL
SENSOR (SUB)
D-17
SERVICE
HOLE
AK303876AB
CONNECTOR: D-18
SERVICE
HOLE
FUEL LEVEL SENSOR (MAIN)
(INTEGRATED IN FUEL PUMP MODULE)
D-18 (GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-827
.
CIRCUIT OPERATION
• The fuel level sensor (main) output voltage is
input in PCM (terminal No. 24).
.
TECHNICAL DESCRIPTION
• Branch the output voltage from the fuel level sen-
sor circuit, and input it into PCM.
• The PCM detects the amount of fuel left in the
fuel tank with this signal, and also controls the
fuel level warning light.
.
DESCRIPTIONS OF MONITOR METHODS
Detect malfunction if change of fuel level sensor out-
put voltage is small when sum of fuel injection is
large.
.
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)
• Not applicable
Sensor (The sensor below is determined to be
normal)
• Not applicable
.
AK303838AB
C-25
CONNECTOR: C-25
AK303877AB
C-28
CONNECTOR: C-28
AK303085
CONNECTOR: B-20
PCM
AB
AIR CLEANER
B-20
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