Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 195

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-479

MULTIPORT FUEL INJECTION (MFI) RELAY AND
FUEL PUMP RELAY CONTINUITY CHECK

M1131009900061

INTAKE AIR TEMPERATURE SENSOR CHECK

M1131002800052

1. Disconnect the volume air flow sensor connectors.

2. Measure resistance between terminals 5 and 6.

Standard value:

5.3

−

6.7 k

Ω

[at 0

°

C (32

°

F)]

2.3

−

3.0 k

Ω

[at 20

°

C (68

°

F)]

1.0

−

1.5 k

Ω

[at 40

°

C (104

°

F)]

0.30

−

0.42 k

Ω

[at 80

°

C (176

°

F)]

3. If not within specifications, replace the volume air flow

sensor.

4. Measure resistance while heating the sensor using a hair

dryer.

Normal condition:

5. If resistance does not decrease as heat increases, replace

the volume air flow sensor assembly.

ENGINE COOLANT TEMPERATURE SENSOR
CHECK

M1131003100056

CAUTION

Be careful not to touch the connector (resin section) with
the tool when removing and installing.
1. Drain engine coolant, then remove the engine coolant

temperature sensor.

BATTERY
VOLTAGE

BATTERY POWER
SUPPLY
TERMINAL

SPECIFIED
CONDITION

Not supplied

-

2-4

Supplied

2-41-3

AKX01433

MFI RELAY SIDE
CONNECTOR

1 2

4

3

AB

AKX01407AB

INTAKE AIR TEMPERATURE
SENSOR SIDE CONNECTOR

1 2 3 4 5 6 7

TEMPERATURE

RESISTANCE (k

Ω

)

Higher

Smaller

AKX01621 AB

INTAKE AIR
TEMPERATURE
SENSOR

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-480

2. With the temperature sensing portion of engine coolant

temperature sensor immersed in hot water, check the
resistance.

Standard value:

5.1

−

6.5 k

Ω

[at 0

°

C (32

°

F)]

2.1

−

2.7 k

Ω

[at 20

°

C (68

°

F)]

0.9

−

1.3 k

Ω

[at 40

°

C (104

°

F)]

0.26

−

0.36 k

Ω

[at 80

°

C (176

°

F)]

3. If resistance deviates from the standard value greatly,

replace the sensor.

4 . Apply 3M



AAD part number 8731 or equivalent to threaded

portion.

5. Install the engine coolant temperature sensor and tighten it

to the specified torque.

Tightening torque: 29

±

10 N

⋅

m (22

±

7 ft-lb)

THROTTLE POSITION SENSOR CHECK

M1131003200105

Required Special Tool:
MB991348: Test Harness Set
Checking the Terminal Resistance
1. Disconnect the throttle position sensor connector.

2. Measure resistance between the throttle position sensor

side connector terminal 1 and terminal 4.

Standard value: 3.5

−

6.5 k

Ω

3. Measure resistance between the throttle position sensor

side connector terminal 1 and terminal 3.

Normal condition:

4. If resistance is outside the standard value, or if it doesn't

change smoothly, replace the throttle position sensor.

NOTE: After replacement, the throttle position sensor should
be adjusted. (Refer to

P.13A-473

.)

AKX01622

AKX01623 AB

Throttle valve slowly open
until fully open from the idle
position

Changes smoothly in
proportion to the opening
angle of the throttle valve

AKX01413

THROTTLE POSITION
SENSOR CONNECTOR

1 2 3 4

AB

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-481

Check using oscilloscope
1. Disconnect the throttle position sensor connector and

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

2. Connect the oscilloscope probe to the throttle position

sensor side connector terminal 3.

3. Turn the ignition switch "ON" position.

4. Slowly move the throttle lever from the idle position to the

full-throttle position and check then if the waveform is free
from any noise.

5. If any noise is recognized, replace the throttle position

sensor.

NOTE: After replacement, the throttle position sensor should
be adjusted. (Refer to

P.13A-473

.)

HEATED OXYGEN SENSOR CHECK

M1131005000129

Required Special Tools:
MB991658: Test Harness Set
MD998464: Test Harness
<Heated oxygen sensor (rear)>
1. Using scan tool MB991502, observe HO

2

S reading. If

values are unsatisfactory, or if Scan tool is not available, use
the following procedure:

(1) Disconnect the heated oxygen sensor connector and

connect special tool MB991658 to the connector on the
heated oxygen sensor side.

(2) Make sure that there is continuity [11-18

Ω

at 20

°

C

(68°

F)] between terminal 3 and terminal 4 on the heated
oxygen sensor connector

(3) If there is no continuity, replace the heated oxygen

sensor.

(4) Warm up the engine until engine coolant is 80

°

C (176

°

F

)

or higher.

CAUTION

Be very careful when connecting the jumper wires;
incorrect connection can damage the heated oxygen
sensor.

(5) Use the jumper wires to connect terminal 3 of the heated

oxygen sensor connector to the positive battery terminal
and terminal 4 to the negative battery terminal.

(6) Connect a digital voltage meter between terminal 1 and

terminal 2.

2. While repeatedly revving the engine, measure the heated

oxygen sensor output voltage.

AKX01461AB

THROTTLE POSITION
SENSOR CONNECTOR

OSCILLOSCOPE

1 2 3 4

AKX01462AB

NORMAL WAVEFORM

THROTTLE LEVER
FULL-THROTTLE
POSITION

THROTTLE
LEVER
IDLE
POSITION

AK000121AB

HEATED OXYGEN SENSOR
EQUIPMENT SIDE CONNECTOR

MB991658

AK000122

JUMPER
WIRES

MB991658

AB

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-482

Standard value:

3. If the sensor is defective, replace the heated oxygen sensor.

NOTE: For removal and installation of the heated oxygen
sensor, refer to GROUP 15, Exhaust Pipe and Main Muffler

P.15-19

.

<Heated oxygen sensor (front)>
1. Using the scan tool MB991502, observe HO

2

S reading. If

values are unsatisfactory, or if Scan tool is not available, use
the following procedure:

(1) Disconnect the heated oxygen sensor connector and

connect special tool MD998464 to the connector on the
heated oxygen sensor side.

(2) Make sure that there is continuity [4.5

−

8.0

Ω

at 20

°

C

(68°

F)] between terminal 1 (red clip of special tool) and

terminal 3 (blue clip of special tool) on the heated oxygen
sensor connector

(3) If there is no continuity, replace the heated oxygen

sensor.

(4) Warm up the engine until engine coolant is 80

°

C (176

°

F

)

or higher.

CAUTION

Be very careful when connecting the jumper wires;
incorrect connection can damage the heated oxygen
sensor.

(5) Use the jumper wires to connect terminal 1 (red clip) of

the heated oxygen sensor connector to the positive
battery terminal and terminal 3 (blue clip) to the negative
battery terminal.

(6) Connect a digital voltage meter between terminal 2 (black

clip) and terminal 4 (white clip).

2. While repeatedly revving the engine, measure the heated

oxygen sensor output voltage.

Standard value:

ENGINE

HEATED OXYGEN
SENSOR OUTPUT
VOLTAGE

REMARKS

When
revving
engine

0.6

−

1.0V

If you make the air/fuel
ratio rich by revving the
engine repeatedly, a
normal heated oxygen
sensor will output a
voltage of 0.6

−

1.0V.

AKX01624

HEATED
OXYGEN
SENSOR
EQUIPMENT
SIDE
CONNECTOR

MD998464

BLUE

RED

AC

AKX01625AC

BLUE

RED

BLACK

JUMPER
WIRES

WHITE

MD998464