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Mitsubishi Outlander (2013+). Manual - part 324

AK703483

(V)

Standard wave pattern

(ms)

Point A

Power supply voltage

Point B
Injector operation
time

Counter electromotive force
of solenoid coil

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-177

Description of Wave Patterns

• Normally the power supply voltage is shown.

When the engine-ECU outputs the injector drive
signal ON, the voltage falls to approximately 0V
during the period of the signal ON. (See Point B.)

• When the engine-ECU stops the output of the

injector drive signal, the voltage peak appears
due to the counter electromotive force of the coil.
(See Point A.) And then the power supply voltage
returns to its normal value.

• Injector operation time: fuel injection period deter-

mined by engine-ECU according to various sen-
sor output values. Injector operation time =
effective injection period + invalid injection period
(invalid injection period: compensation of injector
response delay due to decrease in power supply
voltage)

• Counter electromotive force of solenoid coil: the

counter electromotive force is created in the
injector coil when the engine-ECU stops the out-
put of the injector drive signal.

• Power supply voltage: the power supply voltage

is shown when the engine-ECU stops the output
of the injector drive signal ON. If this supply volt-
age is low, the injector operation time becomes
longer as the invalid injection time becomes
longer.

Wave Pattern Observation Points

•

Solenoid coil counter
electromotive force is
low or doesn't appear at
all.

Short-circuit in the
injector solenoid

Point A: The level of counter electromotive force
of solenoid coil:

•

AK604472AC

When idling

When racing

Point B: Injector operation time

Operation time

Consistent with the
displayed time on
M.U.T.-III.

Force an excessive
acceleration.

The drive period will
once extend greatly,
then will be settled to
that corresponding to the
engine speed.

IGNITION COIL (POWER TRANSISTOR
CONTROL SIGNAL)

Measurement Method

AKC00026

Ignition coil
connector

Oscilloscope

CH1

TROUBLESHOOTING

MULTIPOINT FUEL INJECTION (MPI)

13A-178

1. Disconnect the ignition coil connector and insert

the special tool test harness (MB991658)
in-between the separated connectors. (Always
mate all the terminals.)

2. Connect the oscilloscope probe to terminal No. 1

of the ignition coil connector.

3. To verify the ignition advance angle, observe it

simultaneously with the crank angle sensor output
signals.

Alternate Method (Measure at the
engine-ECU)

1. Disconnect the engine-ECU connector and

connect the special tool Power plant ECU check
harness (MB992110) in between.

2. Connect the oscilloscope probe to engine-ECU

terminal CIL1. (When checking the No. 1
cylinder.)

3. Connect the oscilloscope probe to engine-ECU

terminal CIL2. (When checking the No. 2
cylinder.)

4. Connect the oscilloscope probe to engine-ECU

terminal CIL3. (When checking the No. 3
cylinder.)

5. Connect the oscilloscope probe to engine-ECU

terminal CIL4. (When checking the No. 4
cylinder.)

Standard Wave Pattern

Observation condition

Function

Special patterns

Pattern height

Low

Pattern selector

Display

Engine

Idle

AK502870AC

OFF

(ms)

Ignition period

Dwell section

Crank angle sensor
output wave pattern

Power transistor
control signal
wave pattern

(V)

TDC

Standard wave pattern

2 engine revolutions (1 camshaft revolution)

Description of Wave Patterns

• Power transistor ON condition:

An interval when the power transistor is ON and the

primary side of ignition coil is conducted (referred
to as "dwell interval") This conduction period gets
longer if the battery voltage is low or vice versa
so that the primary voltage at ignition can be con-
trolled to a constant level.

• Power transistor OFF condition:

This interval corresponds to when the power transis-

tor is OFF and the power transistor drive signal is
not outputted from the engine-ECU.

Wave Pattern Observation Points

• Verify that the power transistor control signal

(ignition timing) advances as the engine speed
increases.

Examples of Abnormal Wave Pattern

Wave pattern characteristics

AK203246

Normal wave pattern

ON-VEHICLE SERVICE

MULTIPOINT FUEL INJECTION (MPI)

13A-179

The voltage is low.

Cause of problem

Open-circuit in the ignition primary circuit.

ON-VEHICLE SERVICE

THROTTLE BODY (THROTTLE VALVE
AREA) CLEANING

M1131001002457

WARNING

When touching the throttle valve, surely shut
off the driving circuits of the throttle valve. In
the event that the throttle valve is operated, a
finger might be injured as the result of being
caught by the throttle valve.

CAUTION

When throttle body is cleaned, use the M.U.T.-III
to initialise the learning value (Refer to GROUP
00

− Precautions Before Service − Initialisation

Procedure for Learning Value in MPI Engine ).
1. Disconnect the electronic-controlled throttle valve

connector.

2. Remove the air intake hose from the throttle body.

3. Remove the throttle body assembly.

CAUTION

Do not spray the cleaning fluid directly to the
throttle valve.

4. Spray the cleaning fluid on a clean cloth.

CAUTION

• Make sure it does not enter the sensor

through the shaft.

•

AK502993AC

Areas on throttle valve to

apply molybdenum disulfide

Do not remove molybdenum. which is applied
around the throttle valve of the throttle body.

5. Wipe off the dirt around the throttle valve with the

cloth sprayed with cleaning fluid.

6. Install the throttle body assembly.

7. Install the air intake hose.

8. Connect the electronic-controlled throttle valve

connector.

FUEL PRESSURE TEST

M1131001902999

1. Release residual pressure from the fuel pipe line

to prevent fuel gush out. Reduce pressurized fuel
lines (Refer to

P.13A-181

ON-VEHICLE SERVICE

MULTIPOINT FUEL INJECTION (MPI)

13A-180

CAUTION

Cover the hose connection with rags to prevent
splash of fuel that could be caused by some
residual pressure in the fuel pipe line.

AKC00050AB

Rocker cover

Fuel high pressure hose

2. Remove the fuel high-pressure hose at the

delivery pipe.

AKA00404 AB

MD998709

MB992001

MB992049

MB992076

3. Assemble the special tool called injector test set

(MB992076) as shown in the figure according to
the following procedure.

a. Remove the injector installation adapter from the

hose. Remove another hose together with the
adapter and remove the adopter from the remain-
ing hose.

b. Install the special tool MB992049 (quick connec-

tor) and the special tool MB992001 (hose
adapter) to the hose without the adapter.

c. Remove the nipple of the bolt of the special tool

MD998709 (adapter hose).

d. Install the special tool prepared in the procedure

"c" to the nipple that was removed together with
hose in the procedure "a".

4. Install the special tool assembled in Step 3

between the delivery pipe and fuel high-pressure
hose.

<Where the fuel pressure gauge is used>

AKA00405 AB

High-pressure
fuel hose

Delivery pipe

O-ring or gasket

Fuel pressure
gauge set

Install the fuel pressure gauge on the special tool for

measuring the fuel pressure via an appropriate
O-ring or gasket.

<Where the fuel pressure gauge set is used>

AKA00406 AB

High-pressure
fuel hose

Delivery pipe

Gasket

MB991981

Install the special tool fuel pressure gauge set

(MB991981) on the special tool for measuring the
fuel pressure via an appropriate gasket.

b. Connect the leads from the fuel pressure gauge

set to the power supply (cigarette lighter socket)
and special tool vehicle communication interface
(V.C.I.) (MB991824).

CAUTION

Connection and disconnection of M.U.T.-III
should be always performed with the ignition
switch turned to the LOCK (OFF) position.

5. Connect the M.U.T.-III to the diagnosis connector.

6. Turn the ignition switch to the ON position. (But do

not start the engine.)

7. Select "Item No. 9" from the M.U.T.-III actuator

test to drive the fuel pump. Check that there are
no fuel leaks from any parts.

8. Finish the actuator test or turn the ignition switch

to "LOCK" (OFF) position.

9. Start the engine and run at idle.

10.Measure fuel pressure while the engine is running

at idle.

Standard value: Approximately 324 kPa

Content .. 322 323 324 325 ..