Mitsubishi Eclipse. Manual — part 354

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-909

9

− 12

34

− 41

Evaporative emission purge solenoid

30

− 34 ohms [at 20°C (68°F)]

13

− Body

ground

42

− Body

ground

ECM or PCM ground

Continuity (approximately 0 ohm)

26

− Body

ground

48

− Body

ground

ECM or PCM ground

54

− 12

26

− 41

Heated oxygen sensor heater (rear)

11

− 18 ohms [at 20°C (68°F)]

55

− 12

35

− 41

Evaporative emission ventilation
solenoid

17

− 21 ohms [at 20°C (68°F)]

60

− 12

3

− 41

Heated oxygen sensor heater (front)

4.5

− 8.0 ohms [at 20°C (68°F)]

72

− 92

57

− 64

Intake air temperature sensor

13

− 17 kΩ [when intake air temperature

is

−20°C (−4°F)]

5.3

− 6.7 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)]

0.30

− 0.42 kΩ [when intake air

temperature is 80

°C (176°F)]

83

− 92

44

− 57

Engine coolant temperature sensor

14

− 17 kΩ [when engine coolant

temperature is

−20°C (−4°F)]

5.1

− 6.5 kΩ [when engine coolant

temperature is 0

°C (32°F)]

2.1

− 2.7 kΩ [when engine coolant

temperature is 20

°C (68°F)]

0.9

− 1.3 kΩ [when engine coolant

temperature is 40

°C (104°F)]

0.48

− 0.68 kΩ [when engine coolant

temperature is 60

°C (140°F)]

0.26

− 0.36 kΩ [when engine coolant

temperature is 80

°C (176°F)]

TERMINAL
NO.

TERMINAL
NO.

INSPECTION ITEM

NORMAL CONDITION (INSPECTION
CONDITION)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-910

INSPECTION PROCEDURE USING AN
OSCILLOSCOPE

M1131154500587

VOLUME AIRFLOW SENSOR

Required Special Tool:

• MB991709: Test Harness Set

.

Measurement Method
1. Disconnect the volume airflow sensor connector, and

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

2. Connect the oscilloscope probe to volume airflow sensor

connector terminal No. 3.

.

Alternate method (Test harness not available)
<M/T>
Connect the oscilloscope probe to ECM terminal No. 90.
<A/T>
Connect the oscilloscope probe to PCM terminal No. 65.
Standard Wave Pattern

Observation conditions

Function

Special pattern

Pattern height

Low

Pattern selector

Display

Engine r/min

Idle speed

Observation conditions

Rev engine, observe T

1

and T

2

remain equal.

AK102975AC

1 2 3 4 5 6 7

VOLUME AIRFLOW
SENSOR CONNECTOR

OSCILLOSCOPE

MB991709

AKX01595

THE TIME (CYCLE TIME) T IS REDUCED WHEN THE
AMOUNT OF INTAKE AIR INCREASES.

TIMES T

1

AND T

2

ARE EQUAL

T

T

1

T

2

10

0

(V)

TIME

AB

Standard wave pattern

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-911

Wave Pattern Observation Points
Check that cycle time T becomes shorter and the frequency

increases when the engine speed is 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

• Damaged rectifier or vortex generation column.

Wave pattern characteristics

• Unstable wave pattern with non-uniform frequency. An

ignition leak will distort the wave pattern temporarily,
even if the volume airflow sensor is normal.

AKX01596

10

0

(V)

T

TIME

AB

Standard wave pattern

AKX01597

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-912

CAMSHAFT POSITION SENSOR AND
CRANKSHAFT POSITION SENSOR

Required Special Tools:

• MB991709: Test Harness Set

• MD998478: Test Harness

.

Measurement Method
1. Disconnect the camshaft position sensor connector, and

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

2. Connect the oscilloscope probe to camshaft position sensor

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)
<M/T>

1. Connect the oscilloscope probe to ECM terminal No. 88.

(Check the camshaft position sensor signal wave pat-
tern.)

2. Connect the oscilloscope probe to ECM terminal No. 89.

(Check the crankshaft position sensor signal wave pat-
tern.)

<A/T>

1. Connect the oscilloscope probe to PCM terminal No. 56.

(Check the camshaft position sensor signal wave pat-
tern.)

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

(Check the crankshaft position sensor signal wave pat-
tern.)

Standard Wave Pattern

Observation conditions

Function

Special pattern

Pattern height

Low

Pattern selector

Display

Engine r/min

Idle speed

AK102976AB

1 2 3

CAMSHAFT POSITION
SENSOR CONNECTOR

OSCILLOSCOPE

MB991709

AK102979AB

MD998478

1 2

3

CRANKSHAFT POSITION
SENSOR CONNECTOR

OSCILLOSCOPE