Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 185

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-439

STEP 14. Check for open circuit between ignition failure
sensor connector B-03 terminal 2 and ECM connector C-56
terminal 58 <M/T> or PCM connector C-54 terminal 43 <A/
T>.
Q: Is the harness wire in good condition?

YES : Replace the ECM or PCM. Then confirm that the

malfunction symptom is eliminated.

NO : Repair it. Then confirm that the malfunction symptom

is eliminated.

INSPECTION PROCEDURE 34: A/C system.

ACX02471

CONNECTOR : B-03

AF

IGNITION
FAILURE
SENSOR

AK000280

C-54

C-56

ECM<M/T>
OR
PCM<A/T>

CONNECTORS:C-56<M/T>,C-54<A/T>

BP

AK000684

GREEN-

RED

GREEN

ENGINE CONTROL
MODULE(ECM)<M/T>
OR
POWERTRAIN CONTROL
MODULE(PCM)<A/T>

45<M/T>*2
83<A/T>*4

8<M/T>*1
20<A/T>*3

C-49<M/T>
(MU803773)

C-53<M/T>
(MU803771)

C-50<A/T>
(MU803784)

C-57<A/T>
(MU803782)

A/C COMPRESSOR
RELAY

NOTE
*1:ECM connector C-49<M/T>
*2:ECM connector C-53<M/T>
*3:PCM connector C-50<A/T>
*4:PCM connector C-57<A/T>

AUTOMATIC
COMPRESSOR
CONTROLLER

6

17

8

15

9

18

7

20

16

2

10

13

12

23 24 25 26

11

21

3

1

14

4

19

5

22

12

11

16

5 6

7 8

21

13
27

14
28

15
29

17
30

18
31

19
32

20
33

22
34

23
35

1

24

3

26

9

2

25

10

4

34

33

32

36

35

37

42

45

31

39

38

46

40 41

43 44

98

78

71

88 89

76 77

72
79
91

73
80

74

75

81
92

8283
93

8485

94

8687

9596

90

97

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-440

COMMENT

•

When the A/C is "ON," the battery positive
voltage is applied on the ECM (terminal 45) <M/
T> PCM (terminal 83) <A/T> from the automatic
compressor controller.
When battery positive voltage is applied to the
ECM <M/T> or PCM <A/T>, the ECM <M/T> or
PCM <A/T> turns "ON" the power transistor in the
ECM <M/T> or PCM <A/T>. The ECM <M/T> or
PCM <A/T> delays A/C engagement momentarily
while it increases idle rpm. Then the A/C
compressor clutch relay coil will be energized.

With this, the A/C compressor clutch relay turns
"ON," and the A/C compressor clutch functions.

TROUBLESHOOTING HINTS (The most likely
causes for this case:)

•

Malfunction of the A/C control system.

•

Malfunction of the A/C switch.

•

Improper connector contact, open circuit or short-
circuited harness wire.

•

Malfunction of the ECM <M/T> or PCM <A/T>.

DIAGNOSIS

STEP 1. Check connector C-49, C-53 at ECM <M/T> or
connector C-50, C-57 at PCM <A/T> for damage.
Q: Is the connector in good condition?

YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then confirm that

the malfunction symptom is eliminated.

AK000280

C-49,
C-50

C-53

C-57

ECM<M/T>
OR
PCM<A/T>

CONNECTORS:C-49,C-53<M/T>,
C-50,C-57<A/T>

BQ

AK000280

C-49,
C-50

C-53

C-57

ECM<M/T>
OR
PCM<A/T>

CONNECTORS:C-49,C-53<M/T>,
C-50,C-57<A/T>

BQ

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-441

STEP 2. Check the circuit at ECM connector C-49 <M/T> or
PCM connector C-50 <A/T>.
(1) Disconnect the connectors C-49 <M/T> or C-50 <A/T> and

measure at the harness side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 8 <M/T> or 20 <A/T>

and ground.

•

Voltage should be battery positive voltage.

(4) Using a jumper wire, connect terminal 8 <M/T> or 20 <A/T>

to ground.

•

A/C compressor relay should turn "ON".

(5) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the voltage and A/C compressor relay condition

normal?
YES : Go to Step 3.
NO : Refer to GROUP 55, Heating and air conditioning

−

Introduction To Heater, Air Conditioning And
Ventilation Diagnosis (

P.55-4

). Then confirm that the

malfunction symptom is eliminated.

STEP 3. Check the circuit at ECM connector C-53 <M/T> or
PCM connector C-57.
(1) Disconnect the connectors C-53 <M/T> or C-57 <A/T> and

measure at the harness side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 45 <M/T> or 83 <A/

T> and ground.

•

Voltage should be 1 volt or less when the A/C switch is
"OFF".

•

Voltage should be battery positive voltage when the A/C
switch is "ON".

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the voltage normal?

YES : Replace the ECM or PCM. Then confirm that the

malfunction symptom is eliminated.

NO : Refer to GROUP 55, Heating and air conditioning

−

Introduction To Heater, Air Conditioning And
Ventilation Diagnosis (

P.55-4

).

AK000419AC

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

<M/T>

C-49 HARNESS
SIDE CONNECTOR

AKX01448

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

28

29

30

31

32

33

34

35

36

C-50 HARNESS
SIDE CONNECTOR

<A/T>

AG

AK000420

<M/T>

C-53 HARNESS
SIDE CONNECTOR

AC

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

AKX01449

C-57 HARNESS
SIDE CONNECTOR

<A/T>

77 76
89 88
98

75
87

97

86
96

85
95

84

82

83
94 93

81
92

80

74 73 72 71

79 78
91 90

AG

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-442

DATA LIST REFERENCE TABLE

M1131008900154

CAUTION

•

When shifting the select lever to D range, the brakes should be applied so that the vehicle does
not move forward.

•

Driving tests always need two persons: one driver and one observer.

NOTE:

*1

: If the idle speed is lower than the standard value on a very cold engine (approximately -20

°

C (-4

°

F) even when the IAC motor is fully opened, the air volume limiter built in the throttle body could be defective.

NOTE:

*2

: In a new vehicle [driven approximately 500 km (311 mile) or less], the step of the stepper motor is

sometimes 30 steps greater than the standard value.

NOTE:

*3

: The injector drive time represents the time when the cranking speed is at 250 r/min or below when

the power supply voltage is 11 volts.

NOTE:

*4

: In a new vehicle [driven approximately 500 km (311 mile) or less], the injector drive time is

sometimes 10% longer than the standard time.

NOTE:

*5

: In a new vehicle [driven approximately 500 km (311 mile) or less], the volume air flow sensor

output frequency is sometimes 10% higher than the standard frequency.

NOTE:

*6

: Applicable to General Scan Tool (GST).

MUT-II SCAN
TOOL
DISPLAY

ITEM
NO.

INSPECTION
ITEM

INSPECTION REQUIREMENT

NORMAL
CONDITION

INSPECTION
PROCEDURE
NO.

REFERENCE
PAGE

A/C
RELAY

4

9

A/C
compressor
clutch relay

Engine:
warming up,
idling

A/C switch:
"OFF"

OFF
(Compressor
clutch is not
operating)

Procedure
No.34

P.13A-439

A/C switch:
"ON"

ON
(Compressor
clutch is
operating)

A/C
SWITCH

28

A/C switch

Engine: idle
(when A/C
switch is ON,
A/C
compressor
should be
operating)

A/C switch:
"OFF"

OFF

Procedure
No.34

P.13A-439

A/C switch:
"ON"

ON

BARO
SENSOR

25

Barometric
pressure
sensor

Ignition switch:
"ON"

At altitude of 0
m (0 ft)

101 kPa

Code No.
P0107,
P0108

P.13A-42

,

P.13A-52

At altitude of
600 m
(1,969 ft)

95 kPa

At altitude of
1,200 m
(3,937 ft)

88 kPa

At altitude of
1,800 m
(5,906 ft)

81 kPa

BATT
VOLTAGE

16

power supply
voltage

Ignition switch: "ON"

Battery positive
voltage

Procedure
No.29

P.13A-409