Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 176

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-403

STEP 5. Check for open circuit and short circuit to ground
and harness damage between generator connector B-45
terminal 1 and ECM connector C-53 terminal 33 <M/T> or
PCM connector C-50 terminal 8 <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.

AK000546AC

CONNECTOR:C-45

AK000280

C-50

C-53

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

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

BK

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-404

INSPECTION PROCEDURE 27: Incorrect Idle Speed When the A/C is Operating (A/C Switch 2 Signal)

CIRCUIT OPERATION

•

The ECM <M/T> or PCM <A/T> increases the
engine idle speed by driving the IAC motor when
the automatic compressor-ECU sends a "A/C on"
signal to the module.

•

The automatic compressor-ECU detects how the
air conditioning is applying load to the engine,
and converts the information to a voltage signal
(High voltage= low load, Low voltage= high load).
This voltage signal is called "A/C switch 2 signal."

The ECM <M/T> or PCM <A/T> receives this A/C
switch 2 signal from the automatic compressor
controller through terminal 24 <M/T> or terminal
61 <A/T>, and determines the idle-up speed
according to the high or low air conditioning load.

TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)

•

Malfunction of the A/C control system.

•

Open or shorted circuit, or improper connector
contact.

AK000677

BL

UE-

WHITE

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

AUTOMATIC COMPRESSOR CONTROLLER

C-49<M/T>
(MU803773)

C-54<A/T>
(MU803781)

24<M/T>
61<A/T>

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

42 43
48 49 50 51 52 53 54 55 56 57

46

45

44

58 59

60 61 62 63

64 65 66

47

41

AK000280

C-49

C-54

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

CONNECTORS:C-49<M/T>,C-54<A/T>

BL

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-405

•

ECM <M/T> or PCM <A/T> failed.

DIAGNOSIS

STEP 1. Check connector C-49 at ECM <M/T> or connector
C-54 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.

STEP 2. Check the output voltage at ECM harness side
connector C-49 <M/T> or PCM harness side connector C-
54 <A/T>.
(1) Disconnect the connector C-49 <M/T> or C-54 <A/T> and

measure at the harness side.

(2) Start the engine and run at idle.
(3) Turn the A/C switch "ON".
(4) Measure the voltage between terminal 24 <M/T> or 61 <A/

T> and ground.

•

If atmospheric air temperature is 15

°

C (59

°

F) or less,

the voltage should be 1 volt or less.

•

If atmospheric air temperature is 18

°

C (65.4

°

F) more,

the voltage should be battery positive voltage.

(5) Turn the A/C switch "OFF".
(6) 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, Introduction To Heater, Air

Conditioning And Ventilation Diagnosis (

P.55-4

).

AK000280

C-49

C-54

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

CONNECTORS:C-49<M/T>,C-54<A/T>

BL

AK000390AC

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

AKX01505

C-54 HARNESS
SIDE CONNECTOR

<A/T>

46 45 44

57 56 55

66 65 64

54 53 52 51 50 49

48

47

43 42

41

63 62 61 60

59

58

AF

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-406

INSPECTION PROCEDURE 28: Fans (radlator fan) is inoperative

AK000678

2 3

1

5

1

4

8

7

2

6

3

BLUE-ORANGE

BLUE-ORANGE

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

FAN CONTROLLER

5V

A-30
(MU802322)

C-07
MU801333

2

6

21<M/T>
18<A/T>

6

17

8

15

9

18

7

20

16

2

10

13

12

23 24 25 26

11

21

3

1

14

4

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

19

5

4

22

C-49<M/T>
(MU803773)

C-50<A/T>
(MU803784)

AK000280

C-49,C-50

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

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

BC

AK000312AJ

CONNECTOR:C-07