Mitsubishi Galant 9G. Manual — part 921
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-1126
11.Stop the engine and observe fuel pressure gauge reading. It
is normal if the reading does not drop within two minutes. If it
does, observe the rate of drop and troubleshoot and repair
according to the table below. Start, then stop the engine.
(1) Squeeze the fuel supply line closed to confirm leak-down
occurs from defective fuel pump check valve.
(2) If pressure continues to drop with both fuel lines
squeezed closed, injector(s) are leaking.
12.Release residual pressure from the fuel pipe line. (Refer to
WARNING
Cover the hose connection with shop towels to pre-
vent splash of fuel that could be caused by some
residual pressure in the fuel pipe line.
13.Remove the fuel pressure gauge, and special tools
MD998709, MD998742 and MB991637 from the fuel rail.
14.Replace the O-ring at the end of the fuel high-pressure hose
with a new one.
15.Fit the fuel high-pressure hose into the fuel rail and tighten
the bolts to specified torque.
Tightening torque: 5.0
± 1.0 N⋅m (44 ± 8 in-lb)
16.Check for fuel leaks.
(1) Use scan tool MB991958 to operate the fuel pump.
(2) Check the fuel line for leaks and repair as needed.
17.Disconnect scan tool MB991958.
SYMPTOM
PROBABLE CAUSE
REMEDY
• Fuel pressure too low
• Fuel pressure drops after racing
Clogged fuel filter
Replace fuel filter
Fuel leaking to return side due to
poor fuel regulator valve seating or
settled spring
Replace fuel pressure regulator
Low fuel pump delivery pressure
Replace fuel pump
Fuel pressure too high
Binding valve in fuel pressure
regulator
Replace fuel pressure regulator
SYMPTOM
PROBABLE CAUSE
REMEDY
Fuel pressure drops gradually
after engine is stopped
Leaky injector
Replace injector
Leaky fuel regulator valve seat
Replace fuel pressure regulator
Fuel pressure drops sharply
immediately after engine is
stopped
Check valve in fuel pump is held
open
Replace fuel pump
AKX01460AC
FUEL
RAIL
FUEL HIGH-
PRESSURE
HOSE
MD998742
MD998709
ON-VEHICLE SERVICE
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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-1127
FUEL PUMP CONNECTOR DISCONNECTION
(HOW TO REDUCE PRESSURIZED FUEL LINES)
M1131000900622
WARNING
When removing the fuel pipe, etc., release fuel pres-
sure to prevent fuel spray.
1. Remove the rear seat cushion assembly (Refer to GROUP
2. Remove the hole cover (LH).
3. Disconnect the fuel pump module connector.
4. After starting the engine and letting it run until it stops
naturally, turn the ignition switch to the "LOCK" (OFF)
position.
5. Connect the fuel pump module connector.
6. Install the hole cover (LH).
Tightening torque: 1.5
± 0.5 N⋅m (14 ± 4 in-lb)
7. Install the rear seat cushion assembly (Refer to GROUP
52A, Rear Seat Assembly
AC306089AD
HOLE COVER
AC306490
FUEL PUMP MODULE
CONNECTOR
AB
AC306089
1.5 ± 0.5 N·m
14 ± 4 in-lb
AE
HOLE COVER
ON-VEHICLE SERVICE
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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-1128
FUEL PUMP OPERATION CHECK
M1131002000692
Required Special Tool:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A
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. Check the operating of the fuel pump by using scan tool
MB991958 to force-drive the fuel pump.
2. If the fuel pump will not operate, check by using the
following procedure. If normal, check the fuel pump drive
circuit.
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Remove the rear seat cushion assembly (Refer to
GROUP 52A, Rear Seat
(3) Remove the hole cover (LH).
(4) Disconnect the fuel pump module connector.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC306089AD
HOLE COVER
AC306490
FUEL PUMP MODULE
CONNECTOR
AB
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-1129
(5) When the fuel pump drive connector is attached directly
to the battery, check if the sound of the fuel pump
operation can be heard. If no operating sound is heard,
replace the fuel pump module (Refer to GROUP 13C,
On-vehicle Service
− Fuel Pump Module Replacement
).
NOTE: As the fuel pump is an in-tank type, the fuel pump
sound is hard to hear. Remove the fuel tank filler tube cap
and check from the tank inlet.
(6) Check for fuel pressure by pinching the fuel hose with
fingertips.
(7) Connect the fuel pump module connector.
(8) Install the hole cover (LH).
Tightening torque: 1.5
± 0.5 N⋅m (14 ± 4 in-lb)
(9) Install the rear seat cushion assembly (Refer to GROUP
52A, Rear Seat Assembly
MULTIPORT FUEL INJECTION (MFI) RELAY AND
THROTTLE ACTUATOR CONTROL MOTOR
RELAY CONTINUITY CHECK
M1131050000378
Inspect the MFI relay and throttle actuator control motor relay
for continuity in accordance with the chart shown below.
1
2
3
4
5
AC305681
AC306089
1.5 ± 0.5 N·m
14 ± 4 in-lb
AE
HOLE COVER
BATTERY
VOLTAGE
TERMINAL NO.
TO BE
CONNECTED TO
BATTERY
TERMINAL NO.
TO BE
CONDUCTED
Not supplied
−
2
− 3
Supplied
2
− 3
1
− 4
1 2
3 4
1 2
3 4
AK302151
MFI RELAY OR THROTTLE
ACTUATOR CONTROL MOTOR
RELAY SIDE CONNECTOR
MFI RELAY OR THROTTLE
ACTUATOR CONTROL MOTOR
RELAY SIDE CONNECTOR
AB
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