Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 194
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-475
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 MB991502.
10.Start the engine again and let it idle for about 10 minutes.
Check that the idling condition is normal.
FUEL PRESSURE TEST
M1131001900090
Required Special Tools:
MB991502: Scan Tool (MUT-II)
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 high-pressure fuel 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
pressure gauge.
3. Install the assembled fuel pressure measurement tools
between the fuel rail and high-pressure fuel hose.
AK000114
AK000116AB
HIGH-PRESSURE FUEL HOSE
AKX01457AB
FUEL PRESSURE
GAUGE
O-RING OR GASKET
MD998709
MD998742
HIGH-PRESSURE
FUEL HOSE
FUEL
RAIL
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-476
<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 high-pressure fuel hose.
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
4. Connect scan tool MB991502 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 (38 psi) at
curb idle
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 (47
−
50 psi) 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
pressure 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.
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
AKX01458
MB991637
O-RING OR GASKET
MD998709
MD998742
HIGH-
PRESSURE
FUEL HOSE
FUEL
RAIL
AB
AKX01177
16 PIN
MB991502
AB
AK000118
ON-VEHICLE SERVICE
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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-477
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.
14.14.Release residual pressure from the fuel pipe line. (Refer
to
WARNING
Cover the hose connection with shop towels to
prevent 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 high-pressure fuel hose
with a new one.
17.Fit the high-pressure fuel 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 MB991502 to operate the fuel pump.
(2) Check the fuel line for leaks, and repair as needed.
19.Disconnect scan tool MB991502.
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
SYMPTOM
PROBABLE CAUSE
REMEDY
AK000120
AK000120
HIGH-
PRESSURE
FUEL HOSE
MD998709
MD998742
FUEL RAIL
AB
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-478
FUEL PUMP CONNECTOR DISCONNECTION
(HOW TO REDUCE PRESSURIZED FUEL LINES)
M1131000900172
WARNING
When removing the fuel pipe, etc., release fuel
pressure to prevent fuel spray.
1. Disconnect the fuel pump relay.
2. Start the engine and let it run until it stops naturally. Turn the
ignition switch to the "LOCK" (OFF) position.
3. Connect the fuel pump relay.
FUEL PUMP OPERATION CHECK
M1131002000164
Required Special Tool:
MB991502: Scan Tool (MUT-II)
1. Check the operating of the fuel pump by using scan tool
MB991502 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 fuel pump relay, and apply battery voltage to
harness-side connector terminal number 2. Check that an
operating sound can be heard from the fuel pump.
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.
(3) Check for fuel pressure by pinching the fuel hose with
fingertips.
(4) Install the fuel pump relay.
AC000229
FUEL PUMP
RELAY
AB
AC000077
16 PIN
MB991502
AB
AC000230
FUEL PUMP RELAY
AB
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