Mitsubishi Outlander GS45X. Manual - part 758

 

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Mitsubishi Outlander GS45X. Manual - part 758

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-855

Wave Pattern Observation Points
Point A: Height of injector coil induced voltage.

Point B: Injector drive time

1. The injector drive time should be synchronized with the 

scan tool tester display.

2. When the engine is suddenly revved, the drive time will be 

greatly extended at first, but the drive time will soon return 
to original length.

EGR VALVE (STEPPER MOTOR)

Required Special Tools:

• MB991658: Test Harness

• MB992110: Power Plant ECU Check Harness

.

Measurement Method

1. Disconnect the EGR valve connector, and connect the test 

harness special tool (MB991658) between the separated 
connector (All terminals should be connected).

2. Connect the oscilloscope probe to the EGR valve connector 

terminal No. 1, terminal No. 3, terminal No. 4, terminal No. 6 
respectively.

.

CONTRAST WITH 
STANDARD WAVE 
PATTERN

PROBABLE CAUSE

Injector coil induced voltage is 
low or doesn't appear at all

Short in the injector solenoid

AK604472AB

When idling

When racing

AK604473

1

2 3

4

5 6

AB

EGR valve
connector 

Oscilloscope

MB991658

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-856

Alternate method 

1. Disconnect all ECM connectors. Connect the check harness 

special tool (MB992110 between the separated connectors.

2. Connect the oscilloscope probe to check harness terminal 

No. 31, No. 32, No. 47 and No. 48.

Standard Wave Pattern

Wave Pattern Observation Points

1. Check that the standard wave pattern appears when the 

EGR valve is operating.

Observation condition

Function

Special pattern

Pattern height

High

Pattern selector

Display

Engine condition

Revving

16 15 14 13 12 11 10 9 8 7 6 5 4 3

2

1

32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49

AK604467AB

Power plant ECU
check harness connector

MB992110

AK604474

16 15 14 13 12 11 10 9 8 7 6 5 4 3

2

1

32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49

AB

Oscilloscope

Power plant ECU
check harness
connector

AK301251

0

0

Standard wave pattern

Stepper motor
control signal
wave pattern

Stepper motor
control signal
wave pattern

Motor coil energizing time

Point A
Induced electromotive
force from the motor
turning

Point B
Coil reverse electromotive
force (Approximately 40 V)

AG

(V)

Time

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-857

Point A: Presence or absence of induced electromotive force 

from the motor turning. (Refer to abnormal wave pattern.)

Point B: Height of coil back electromotive force

.

Examples of Abnormal Wave Patterns

Example 1
Cause of problem

• Malfunction of motor. (Motor is not operating.)

Wave pattern characteristics

• Induced electromotive force from the motor turning does 

not appear.

Example 2
Cause of problem

• Open circuit in the line between the EGR valve and the 

ECM.

Wave pattern characteristics

• Current is not supplied to the motor coil on the open cir-

cuit side. (Voltage does not drop to 0 volt.) Furthermore, 
the induced electromotive force wave pattern at the nor-
mal side is slightly different from the normal wave pat-
tern.

IGNITION COIL AND IGNITION POWER 
TRANSISTOR

Required Special Tools:

• MB991658: Test Harness

• MB992110: Power Plant ECU Check Harness

.

CONTRAST WITH 
STANDARD WAVE 
PATTERN

PROBABLE CAUSE

Induced electromotive force 
does not appear or is 
extremely small

Malfunction of motor

CONTRAST WITH 
STANDARD WAVE 
PATTERN

PROBABLE CAUSE

Coil reverse electromotive 
force does not appear or is 
extremely small

Short in the coil

AK604475AB

AK604476AB

Open
circuit
side

Normal
side

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-858

Measurement Method

1. Disconnect the ignition coil connector, and connect test har-

ness special tool (MB991658) between the separated con-
nector. (All terminals should be connected.)

2. Connect the oscilloscope probe to ignition coil connector 

terminal No. 2.

.

Alternate method 

1. Disconnect all ECM connectors. Connect the check har-

ness special tool (MB992110) between the separated con-
nectors.

2. Connect the oscilloscope probe to each check harness con-

nector terminal to analyze each cylinder:

• Terminal No. 4 for the number 1 cylinder.

• Terminal No. 5 for the number 2 cylinder.

• Terminal No. 20 for the number 3 cylinder.

• Terminal No. 21 for the number 4 cylinder.

Standard Wave Pattern

AK604477

2 3

1

AB

Ignition coil
connector

Oscilloscope

MB991658

Observation condition

Function

Special pattern

Pattern height

Low

Pattern selector

Display

Engine condition

Idle

16 15 14 13 12 11 10 9 8 7 6 5 4 3

2

1

32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49

AK604467AB

Power plant ECU
check harness connector

MB992110

AK704337

16 15 14 13 12 11 10 9 8 7 6 5 4 3

2

1

32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49

AB

Oscilloscope

Power plant ECU
check harness
connector

 

 

 

 

 

 

 

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