Mitsubishi Galant (2004+). Manual — part 1360
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1133
THROTTLE BODY (THROTTLE VALVE AREA)
CLEANING
M1131001000503
WARNING
If the throttle valve is operation in service, a finger
might be injured as the result of being caught by the
throttle valve. Make sure that the ignition switch is
surely in "LOCK"(OFF) position before the service in
order that the throttle valve cannot be operation.
1. Remove the throttle body.
CAUTION
• Do not spray the cleaning solvent directly to the throttle
valve.
• Make sure the cleaning solvent does not enter the
motor and the sensor through the shaft.
2. Spray cleaning solvent on a clean cloth.
3. Wipe off the dirt around the throttle valve with the cloth
sprayed with cleaning solvent.
4. Attach the throttle body.
FUEL PRESSURE TEST
M1131001900584
Required Special Tools:
• MB991958: Scan tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
• MB991637: Fuel Pressure Gauge Set
• MD998709: Adaptor Hose
• MD998742: Hose Adaptor
1. Release residual pressure from the fuel line to prevent fuel
spray. (Refer to
WARNING
To prevent a fire, cover the hose connection with
shop towels to prevent splashing of fuel that could be
caused by some residual pressure in the fuel pipe
line.
2. Disconnect the fuel high-pressure hose at the fuel rail side.
3. Assemble the fuel pressure measurement tools as follows.
AK203312AB
FUEL
HIGH-PRESSURE
HOSE
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1134
<When using the fuel pressure gauge>
1. Remove the union joint and bolt from special tool
MD998709 (adapter hose) and instead attach special tool
MD998742 (hose adapter) to the adapter hose.
2. Place a suitable O-ring or gasket on the assembled special
tools MD998709 and MD998742 and install the fuel pres-
sure gauge.
3. Install the assembled fuel pressure measurement tools
between the fuel rail and fuel high-pressure hose.
<When using special tool MB991637 (fuel pressure gauge
set)>
1. Remove the union joint and bolt from special tool
MD998709 (adapter hose) and instead attach special tool
MD998742 (hose adapter) to the adapter hose.
2. Install special tool MB991637 (fuel pressure gauge set) into
assembled special tools MD998709 and MD998742 via a
gasket.
3. Install the assembled fuel pressure measurement tools
between the fuel rail and fuel high-pressure hose.
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.
4. Connect scan tool MB991958 to the data link connector.
5. Use Actuator test 07 to drive the fuel pump. Check that there
is no fuel leaking from any section when the fuel pump is
operating.
6. Stop the fuel pump.
7. Start the engine and run at idle.
8. Measure fuel pressure while the engine is running at idle.
Standard value: Approximately 324 kPa (95.7 in.Hg) at
curb idle
9. Check to see that fuel pressure at idle does not drop even
after the engine has been revved several times.
AKX01457AH
FUEL PRESSURE
GAUGE
O-RING OR GASKET
MD998709
MD998742
FUEL
RAIL
FUEL
HIGH-PRESSURE
HOSE
AKX01458
MB991637
O-RING OR GASKET
MD998709
MD998742
FUEL
RAIL
AI
FUEL
HIGH-PRESSURE
HOSE
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
ON-VEHICLE SERVICE
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MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1135
10.If any of fuel pressure measured in steps 8 to 9 is out of
specification, troubleshoot and repair according to the table
below.
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
AKX01460AB
MD998709
FUEL
RAIL
MD998742
HIGH-
PRESSURE
FUEL HOSE
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-1136
FUEL PUMP CONNECTOR DISCONNECTION
(HOW TO REDUCE PRESSURIZED FUEL LINES)
M1131000900633
Refer to GROUP 13A, On-vehicle Service
− Fuel Pump Relay
Disconnection (How to Reduce Pressurized Fuel Lines)
FUEL PUMP OPERATION CHECK
M1131002000700
Refer to GROUP 13A, On-vehicle Service
− Fuel Pump Opera-
tion Check
MULTIPORT FUEL INJECTION (MFI) RELAY AND
THROTTLE ACTUATOR CONTROL MOTOR
RELAY CONTINUITY CHECK
M1131050000345
Inspect the MFI relay and throttle actuator control motor relay
for continuity in accordance with the chart shown below.
BATTERY
VOLTAGE
TERMINAL NO.
TO BE
CONNECTED TO
BATTERY
TERMINAL NO.
TO BE
CONDUCTED
Not supplied
−
2
− 3
Supplied
2
− 3
1
− 4
AK100599
1 2
3 4
1 2
3 4
MFI RELAY OR
THROTTLE
ACTUATOR
CONTROL
MOTOR RELAY
SIDE CONNECTOR
MFI RELAY OR THROTTLE
ACTUATOR CONTROL MOTOR
RELAY SIDE CONNECTOR
AC
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