Mitsubishi Eclipse. Manual - part 290

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-653

STEP 13. Check for harness damage between idle air 
control motor connector B-34 and ECM connector C-49 
<M/T> or PCM connector C-50 <A/T>.

a. Idle air control motor connector B-34 (terminal No. 1) and 

ECM connector C-49 (terminal No. 4) <M/T> or PCM con-
nector C-50 (terminal No. 14) <A/T>.

b. Idle air control motor connector B-34 (terminal No. 3) and 

ECM connector C-49 (terminal No. 17) <M/T> or PCM con-
nector C-50 (terminal No. 28) <A/T>.

c. Idle air control motor connector B-34 (terminal No. 4) and 

ECM connector C-49 (terminal No. 5) <M/T> or PCM con-
nector C-50 (terminal No. 15) <A/T>.

d. Idle air control motor connector B-34 (terminal No. 6) and 

ECM connector C-49 (terminal No. 18) <M/T> or PCM con-
nector C-50 (terminal No. 29) <A/T>.

Q: Is the harness wire in good condition?

YES : Replace the ECM or PCM. Then go to Step 14.
NO :  Repair it. Then go to Step 14.

AK300408

1

2

3

4

5

6

CONNECTOR: B-34

AB

B-34 (B)

HARNESS CONNECTOR:
COMPONENT SIDE

AK300413

1

14

4

19

5

22

6

17

8

15

9

18

7

20

16

2

21

23

26

24

25

3

10

11

12

13

CONNECTOR: C-49 <M/T>

C-49 (G)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AK300414

2

3

4

5

6

7

8

9

11

12

13

14

15

16

17

18

19

20

30

21

22

23

24

25

26

27

28

29

31

32

33

34

35

1

10

C-50 (GR)

CONNECTOR: C-50 <A/T>

AB

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-654

STEP 14. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle − Procedure 6 − 

Other Monitor 

P.13A-5

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0507 set?

YES : Retry the troubleshooting.
NO :  The inspection is complete.

DTC P0513: Immobilizer Malfunction

.

TECHNICAL DESCRIPTION

• ECM <M/T> or PCM <A/T> monitors the commu-

nication condition with the immobilizer-ECU and 
the message from the immobilizer-ECU, and 
when the abnormality is found, ECM <M/T> or 
PCM <A/T> makes the engine not to start.

.

DTC SET CONDITIONS

Check Conditions

• Ignition switch: ON

Judgment Criteria

• When the communication error between ECM 

<M/T> or PCM <A/T> and the immobilizer-ECU 
continues for 2 seconds or more.

.

TROUBLESHOOTING HINTS (The most likely 

causes for this code to be set are: )

• Malfunction of harness or connector.

• Malfunction of immobilizer-ECU.

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

DIAGNOSIS

Required Special Tools:

• MB991958 (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-655

STEP 1. Using scan tool MB991958, read the immobilizer 
diagnostic trouble code (DTC).

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Read the immobilizer system-DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the immobilizer system-DTC is output?

YES : Refer to GROUP 54A, Ignition Switch and 

Immobilizer System 

− Diagnostic Trouble Code Chart 

P.54A-12

.

NO :  If DTC P0513 is output again after the MFI-DTC has 

been erased, replace the ECM <M/T> or PCM <A/T>. 
Then check that the DTC P0513 does not reset.

DTC P0551: Power Steering Pressure Sensor Circuit Range/Performance

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

AK000670

34

33

32

36

35

37

42

45

31

39

38

46

40 41

1

43 44

YELL

O

W

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

C-53 <M/T>
(MU803771)

C-54 <A/T>
(MU803781)

37 <M/T>
52 <A/T>

POWER STEERING
PRESSURE SWITCH

B-19

1

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

Power Steering Pressure Switch Circuit

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-656

.

CIRCUIT OPERATION

• A battery positive voltage is applied to the power 

steering pressure switch output terminal (terminal 
No. 1) from the ECM (terminal No. 37) or PCM 
(terminal No. 52) <A/T> via the resistor in the 
ECM <M/T> or PCM <A/T>.

.

TECHNICAL DESCRIPTION

• The power steering pressure switch converts the 

existence of a power steering load into a high/low 
voltage, and inputs it into the ECM <M/T> or PCM 
<A/T>.

• When the steering wheel is turned, hydraulic 

pressure rises. The power steering pressure 
switch closes, and the applied battery positive 
voltage will be grounded. With this, the power 
steering pressure switch output voltage will fluc-
tuate between 12 volts and 0 volt.

• While driving with the steering wheel held 

straight, the power steering pressure switch turns 
"OFF".

• The ECM <M/T> or PCM <A/T> checks whether 

the power steering pressure switch turns "OFF" 
or "ON" during driving.

.

DESCRIPTIONS OF MONITOR METHODS
Power steering pressure switch stays on during 

specified go/stop operations.

.

MONITOR EXECUTION
Continuous

.

MONITOR EXECUTION CONDITIONS (Other 
monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Engine coolant temperature sensor

.

AK300104

B-19

POWER
STEERING
PRESSURE
SWITCH

AB

CONNECTOR: B-19

AK300060

ECM

CONNECTOR: C-53 <M/T>

AH

C-53 (G)

AK300060AB

C-54 (GR)

PCM

CONNECTOR: C-54 <A/T>