Mitsubishi Outlander GS45X. Manual - part 984

 

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Mitsubishi Outlander GS45X. Manual - part 984

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-869

Alternate method 

1. Disconnect all ECM connectors. Connect the check harness 

special tool (MB992110) between the separated connectors.

2. Connect the oscilloscope to check harness terminal No. 14. 

(Check the camshaft position sensor signal wave pattern.)

3. Connect the oscilloscope to check harness terminal No. 8. 

(Check the crankshaft position sensor signal wave pattern.)

Standard Wave Pattern

Observation condition

Function

Special pattern

Pattern height

Low

Pattern selector

Display

Engine r/min

Idle speed

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

AK700327AB

Power plant ECU
check harness connector

MB992110

AK700421

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-870

Wave Pattern Observation Points

1. Check that cycle time becomes shorter when the engine 

speed increased.

.

Examples of Abnormal Wave Patterns

Example 1
Cause of problem

• Sensor interface malfunction.

Wave pattern characteristics

• Rectangular wave pattern is output even when the 

engine is not started.

Example 2
Cause of problem

• Loose timing belt.

• Abnormality in sensor disc.

Wave pattern characteristics

• Wave pattern is displaced to the left or right.

AK700331

AB

Standard wave pattern

Crankshaft position
sensor output
wave pattern

Camshaft position
sensor output
wave pattern

2 Engine revolutions (1 camshaft revolution)

(Volt)

5

0

5

0

No. 1TDC

No. 2TDC

No. 3TDC

No. 4TDC

No. 5TDC

No. 6TDC

(Time)

TDC: Top dead center

AK700116

AK700117

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-871

INJECTOR

Required Special Tools:

• MB991658: Test Harness

• MB992110: Power Plant ECU Check Harness

.

Measurement Method

Measure at the right bank (number 1, 3, 5 cylinders)

1. Disconnect the intermediate connector B-21, and connect 

the test harness special tool (MB991658) between the sep-
arated connector.

2. Connect the oscilloscope probe to each intermediate con-

nector B-21 terminal to analyze each cylinder:

• Terminal No. 7 for the number 1 cylinder

• Terminal No. 8 for the number 3 cylinder

• Terminal No. 9 for the number 5 cylinder

Measure at the left bank (number 2, 4, 6 cylinders)

1. Disconnect the injector connector, and connect the test har-

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

2. Connect the oscilloscope probe to injector connector termi-

nal 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. 2 for the number 1 cylinder.

• Terminal No. 3 for the number 2 cylinder.

• Terminal No. 18 for the number 3 cylinder.

• Terminal No. 19 for the number 4 cylinder.

• Terminal No. 50 for the number 5 cylinder.

• Terminal No. 51 for the number 6 cylinder.

Standard Wave Pattern

Observation conditions

Function

Special pattern

Pattern height

Variable

Variable knob

Adjust while viewing the 
wave pattern

Pattern selector

Display

Engine r/min

Idle speed

1

2 3

6

7 8

4 5

9 10

AK700328AB

Oscilloscope

MB991658

B-21 Intermediate
connector

AK700329

1 2

AB

Injector
connector

MB991658

Oscilloscope

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

AK700327AB

Power plant ECU
check harness connector

MB992110

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-872

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

.

CONTRAST WITH 
STANDARD WAVE 
PATTERN

PROBABLE CAUSE

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

Short in the injector solenoid

AK700332AB

(V)

50

0

Drive signal: "ON"

Point A

Point B:
Injector drive time

Drive signal: "OFF"

Power voltage

Injection coil induced
voltage (aproximately 50-60V)

Standard wave pattern

AK700118

 

 

 

 

 

 

 

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