Mitsubishi Eclipse. Manual - part 359

 

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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 

P.13A-926

)

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 

P.13A-932

.)

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 

P.13A-932

.)

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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