Mitsubishi Lancer Evolution X. Manual — part 446

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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88 − 89

Intake air temperature sensor 1

13 − 17 kΩ [when intake air temperature is
− 20° C (− 4° F)]
5.4 − 6.6 kΩ [when intake air temperature is 0° C

(32° F)]
2.3 − 3.0 kΩ [when intake air temperature is

20° C (68° F)]
1.0 − 1.5 kΩ [when intake air temperature is

40° C (104° F)]
0.56 − 0.76 kΩ [when intake air temperature is

60° C (140° F)]
0.31 − 0.43 kΩ [when intake air temperature is

80° C (176° F)]

97 − 98

Intake air temperature sensor 2

13 − 18 kΩ [when intake air temperature is
− 20° C (− 4° F)]
5.1 − 6.9 kΩ [when intake air temperature is 0° C

(32° F)]
2.0 − 3.0 kΩ [when intake air temperature is

20° C (68° F)]
0.9 − 1.5 kΩ [when intake air temperature is

40° C (104° F)]
0.40 − 0.78 kΩ [when intake air temperature is

60° C (140° F)]
0.23 − 0.42 kΩ [when intake air temperature is

80° C (176° F)]

TERMINAL
NO.

INSPECTION ITEM

NORMAL CONDITION (INSPECTION
CONDITION)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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INSPECTION PROCEDURE USING AN
OSCILLOSCOPE

M1131154502765

INTAKE CAMSHAFT POSITION SENSOR AND
CRANKSHAFT POSITION SENSOR

Required Special Tools:

• MB991709: Test Harness
• MB992110: Power Plant ECU Check Harness

.

Measurement Method

1. Disconnect the intake camshaft position sensor connector,

and connect the test harness special tool (MB991709)
between the separated connector (All terminals should be
connected).

2. Connect the oscilloscope probe to intake camshaft position

sensor connector terminal No. 3.

3. Disconnect the crankshaft position sensor connector, and

connect the test harness special tool (MB991709) between
the separated connector (All terminals should be
connected).

4. Connect the oscilloscope probe to crankshaft position

sensor connector terminal No. 3.

.

Alternate method

1. Disconnect all ECM connectors. Connect the check harness

special tool (MB992110) between the separated connectors.

AK604465

3

2

1

AD

Intake camshaft position
sensor connector

Oscilloscope

MB991709

AK704086

3

2

1

AB

Crankshaft position
sensor connector

Oscilloscope

MB991709

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-851

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

(Check the intake 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

Wave Pattern Observation Points

1. Check that cycle time becomes shorter when the engine

speed increased.

.

AK604468

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

Oscilloscope

Power plant ECU
check harness
connector

AB

Observation condition

Function

Special pattern

Pattern height

Low

Pattern selector

Display

Engine r/min

Idle speed

AK703687

AD

2 engine revolutions (1 camshaft revolution)

(Volt)

5

0

5

0

No. 1 TDC

No. 3 TDC

No. 4 TDC

No. 2 TDC

(ms)

Standard wave pattern

Crankshaft position
sensor output wave
pattern

Intake camshaft
position sensor
output wave pattern

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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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.

EXHAUST CAMSHAFT POSITION SENSOR AND
CRANKSHAFT POSITION SENSOR

Required Special Tools:

• MB991709: Test Harness
• MB992110: Power Plant ECU Check Harness

.

Measurement Method

1. Disconnect the exhaust camshaft position sensor connector,

and connect the test harness special tool (MB991709)
between the separated connector (All terminals should be
connected).

2. Connect the oscilloscope probe to exhaust camshaft

position sensor connector terminal No. 3.

3. Disconnect the crankshaft position sensor connector, and

connect the test harness special tool (MB991709) between
the separated connector (All terminals should be
connected).

4. Connect the oscilloscope probe to crankshaft position

sensor connector terminal No. 3.

.

AK604469 AB

AK604470

AB

AK604465

3

2

1

AE

Exhaust camshaft position
sensor connector

Oscilloscope

MB991709

AK704086

3

2

1

AB

Crankshaft position
sensor connector

Oscilloscope

MB991709