Mitsubishi Montero Sport (2004+). Manual - part 363

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-865

CAMSHAFT POSITION SENSOR AND 
CRANKSHAFT POSITION SENSOR

Required Special Tools:

• MB991348: Test Harness Set

• MD998478: Test Harness

.

Measurement Method
1. Disconnect the camshaft position sensor intermediate 

connector, and connect the test harness special tool 
(MB991348) in between. (All terminals should be 
connected.)

2. Connect the oscilloscope probe to camshaft position sensor 

intermediate connector terminal No. 2.

3. Disconnect the crankshaft position sensor connector, and 

connect the test harness special tool (MD998478) in 
between.

4. Connect the oscilloscope probe to crankshaft position 

sensor connector terminal No. 2 (black clip of special tool).

.

Alternate method (Test harness not available)
1. Connect the oscilloscope probe to PCM terminal No. 56. 

(Check the camshaft position sensor signal wave pattern.)

2. Connect the oscilloscope probe to PCM terminal No. 45. 

(Check the crankshaft position sensor signal wave pattern.)

Standard Wave Pattern

Observation conditions

Function

Special pattern

Pattern height

Low

Pattern selector

Display

Engine r/min

Idle speed

AK102978AB

1 2 3

OSCILLOSCOPE

MB991348

CAMSHAFT POSITION
SENSOR INTERMEDIATE
CONNECTOR

AK102979AB

MD998478

1 2

3

CRANKSHAFT POSITION
SENSOR CONNECTOR

OSCILLOSCOPE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-866

Wave Pattern Observation Points

1. Check that cycle time T 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.

AKX01600

2 ENGINE REVOLUTIONS (1 CAMSHAFT REVOLUTION)

75

BTDC

5

BTDC

T

CYCLE TIME CHANGES
WITH ENGINE SPEED
CHANGES

CRANKSHAFT

POSITION

SENSOR OUTPUT

WAVE PATTERN

CAMSHAFT

POSITION

SENSOR OUTPUT

WAVE PATTERN

TDC: TOP DEAD CENTER

NO.1 TDC

NO.2 TDC

NO.3 TDC

NO.4 TDC

NO.5 TDC

NO.6 TDC

TIME

Standard wave pattern

AB

AKX01597

AKX01602

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-867

INJECTOR

Required Special Tool:

• MD998474: Test Harness

.

Measurement Method
1. Disconnect the injector intermediate connector, and connect 

the test harness special tool (MD998474) in between.

2. Connect the oscilloscope probe to each injector 

intermediate connector terminal to analyze each cylinder:

• Terminal No. 3 (green clip of special tool) for the number 1 

cylinder

• Terminal No. 2 (white clip) for the number 2 cylinder 

• Terminal No. 1 (blue clip) for the number 3 cylinder

• Terminal No. 7 (yellow clip) for the number 4 cylinder

• Terminal No. 6 (red clip) for the number 5 cylinder

• Terminal No. 5 (black clip) for the number 6 cylinder

.

Alternate method (Test harness not available)
1. Connect the oscilloscope probe to PCM terminal No. 1. 

(When checking the number 1 cylinder.)

2. Connect the oscilloscope probe to PCM terminal No. 9. 

(When checking the number 2 cylinder.)

3. Connect the oscilloscope probe to PCM terminal No. 24. 

(When checking the number 3 cylinder.)

4. Connect the oscilloscope probe to PCM terminal No. 2. 

(When checking the number 4 cylinder.)

5. Connect the oscilloscope probe to to PCM terminal No. 10. 

(When checking the number 5 cylinder.)

6. Connect the oscilloscope probe to PCM terminal No. 25. 

(When checking 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

AK102982 AB

OSCILLOSCOPE

INJECTOR
INTERMEDIATE
CONNECTOR

MD998474

1 2 3 4

5 6 7 8

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-868

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.

CONTRAST WITH 
STANDARD WAVE 
PATTERN

PROBABLE CAUSE

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

Short in the injector solenoid

AKX01604

(V)

50

0

DRIVE SIGNAL:"ON"

POINT B:
INJECTOR DRIVE 
TIME

POINT A

DRIVE SIGNAL:"OFF"

POWER VOLTAGE

INJECTION COIL INDUCED
VOLTAGE (APPROXIMATELY 50-60 V)

AB

Standard wave pattern

AKX01605

WHEN IDLING

WHEN RACING

AB