Mitsubishi Eclipse. Manual — part 359
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-929
NOTE: The adjustment, if made, should be made after first con-
firming that the spark plugs, the injectors, the idle air control
motor, compression, etc., are all normal.
1. The vehicle should be prepared as follows before the
inspection and adjustment.
• Engine coolant temperature: 80 − 95°C (176 − 203°F)
• Lights, electric cooling fan and accessories: OFF
• Transaxle: Neutral (A/T for "P" range)
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.
2. Connect scan tool MB991958 to the data link connector
(16-pin).
3. Start the engine and run at idle.
4. Select the item number 30 of the scan tool Actuator test.
NOTE: Use the scan tool to hold the IAC motor at the basic
step to adjust the basic idle speed.
5. Check the idle speed.
Standard value: 700
± 50 r/min
NOTE: The engine speed may be 20 to 100 r/min lower than
indicated above for a new vehicle [driven approximately 500
km (300 mile) or less], but no adjustment is necessary.
NOTE: If the engine stalls or the engine speed is low even
though the vehicle has been driven approximately 500 km
(300 mile) or more, it is probable that deposits are adhered
to the throttle valve, so clean it. (Refer to
)
6. If not within the standard value range, turn the speed
adjusting screw (SAS) to make the necessary adjustment.
7. Press the scan tool clear key, and release the IAC motor
Actuator test mode.
8. Turn the ignition switch to the "LOCK" (OFF) position.
NOTE: Unless the IAC motor is released, the Actuator test
mode will continue for 27 minutes.
9. Disconnect scan tool MB991958.
10.Start the engine again and let it idle for about 10 minutes.
Check that the idling condition is normal.
FUEL PRESSURE TEST
M1131001900498
Required Special Tools:
• MB991958 (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
• 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
AK300810
AB
MB991911
16-PIN
MB991827
MB991824
AK000114
AK000116AB
HIGH-PRESSURE FUEL HOSE
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-930
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.
<When using the fuel pressure gauge>
1. Remove the union joint and bolt from special tool
MD998709 (adaptor hose) and instead attach special tool
MD998742 (hose adaptor) to the adaptor hose.
2. Place a suitable O-ring or gasket on 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 the special tool MB991637 (fuel pressure
gauge set)>
1. Remove the union joint and bolt from special tool
MD998709 (adaptor hose) and instead attach special tool
MD998742 (hose adaptor) to the adaptor hose.
2. Install special tool MB991637 (fuel pressure gauge set) to
assembled special tools MD998709 and MD998742 via a
gasket.
3. Install the assembled fuel pressure measurement tools
between the fuel rail and the 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 the 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 270 kPa (79.7 in.Hg) at
curb idle
AKX01457AB
FUEL PRESSURE
GAUGE
O-RING OR GASKET
MD998709
MD998742
HIGH-PRESSURE
FUEL HOSE
FUEL
RAIL
AKX01458
MB991637
O-RING OR GASKET
MD998709
MD998742
HIGH-
PRESSURE
FUEL HOSE
FUEL
RAIL
AB
AK300810
AB
MB991911
16-PIN
MB991827
MB991824
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-931
9. Disconnect the vacuum hose from the fuel pressure
regulator and measure fuel pressure with the hose end
closed with your finger.
Standard value: 330
− 350 kPa (97 − 103 in.Hg) at curb
idle
10.Check to see that fuel pressure at idle does not drop even
after the engine has been revved several times.
11.Revving the engine repeatedly, hold the fuel return hose
lightly with your fingers to feel that fuel pressure is present in
the return hose.
NOTE: If the fuel flow rate is low, there will be no fuel pres-
sure in the return hose.
12.If any of fuel pressure measured in steps 10 to 13 is out of
specification, troubleshoot and repair according to the table
below.
13.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 return line closed to confirm leak-down
occurs from defective fuel pressure regulator.
(2) Squeeze the fuel supply line closed to confirm leak-down
occurs from defective fuel pump check valve.
(3) If pressure continues to drop with both fuel lines
squeezed closed, injector(s) are leaking.
SYMPTOM
PROBABLE CAUSE
REMEDY
• Fuel pressure too low
• Fuel pressure drops after racing
• No fuel pressure in fuel return
hose
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
Clogged fuel return hose or pipe
Clean or replace hose or pipe
Same fuel pressure when vacuum
hose is connected and when
disconnected
Damaged vacuum hose or
clogged nipple
Replace vacuum hose or clean
nipple
Defective 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
AK000118
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-932
14.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.
15.Remove the fuel pressure gauge, and special tools
MD998709 and MD998742 from the fuel rail.
16.Replace the O-ring at the end of the fuel high-pressure hose
with a new one.
17.Fit the fuel high-pressure hose into the fuel rail and tighten
the bolts to specified torque.
Tightening torque: 4.9
± 1.0 (44 ± 8 in-lb)
18.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.
19.Disconnect scan tool MB991958.
FUEL PUMP CONNECTOR DISCONNECTION
(HOW TO REDUCE PRESSURIZED FUEL LINES)
M1131000900332
WARNING
When removing the fuel pipe, etc., release fuel pres-
sure to prevent fuel spray.
1. Remove the instrument panel side cover (driver’s side).
2. Disconnect the fuel pump relay (2).
3. Start the engine and let it run until it stops naturally. Turn the
ignition switch to the "LOCK" (OFF) position.
4. Connect the fuel pump relay (2).
5. Install the instrument panel side cover (driver’s side).
FUEL PUMP OPERATION CHECK
M1131002000603
Required Special Tool:
MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
AK000120
AK000120
HIGH-
PRESSURE
FUEL HOSE
MD998709
MD998742
FUEL RAIL
AB
AC103355AB
FUEL
PUMP
RELAY (2)
INSTRUMENT
PANEL
(DRIVER'S SIDE)
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