Mitsubishi Eclipse. Manual - part 514

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-599

STEP 16. Check for harness damage between MFI relay 
connector A-18X (terminal No. 4) and camshaft position 
sensor connector B-22 (terminal No. 6).
Q: Is the harness wire in good condition?

YES : Go to Step 17.
NO :  Repair it. Then go to Step 19.

AK300454

2

1

3

4

CONNECTOR: A-18X

AB

A-18X

HARNESS CONNECTOR:
COMPONENT SIDE

AK300439

3

4

5

1

2

6

7

B-22 (B)

AB

CONNECTOR: B-22

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-600

STEP 17. Check for harness damage between camshaft 
position sensor connector B-22 (terminal No. 5) and ECM 
connector C-58 (terminal No. 50) <M/T> or PCM connector 
C-55 (terminal No. 56) <A/T>.
Q: Is the harness wire in good condition?

YES : Go to Step 18.
NO :  Repair it. Then go to Step 19.

STEP 18. Check the distributor installation.
Q: Is the distributor installation in a good condition?

YES : Replace the distributor. Then go to Step 19.
NO :  Repair it. Then go to Step 19.

AK300439

3

4

5

1

2

6

7

B-22 (B)

AB

CONNECTOR: B-22

HARNESS CONNECTOR:
COMPONENT SIDE

AK300462

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

CONNECTOR: C-55 <A/T>

C-55 (GR)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AK300748

65

43
50

42
49

41
48
60

61

64

46

47

58

59

67

68

45

56
66

52 51

44

53

62

54

63

57

55

CONNECTOR: C-58 <M/T>

AB

C-58 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-601

STEP 19. 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.13B-7

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0340 set?

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

DTC P0401: EGR Flow Insufficient Detected

.

TECHNICAL DESCRIPTION

• When the EGR vacuum regulator solenoid valve 

switches from "OFF" to "ON" while the engine is 
running, EGR gas flows.

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

EGR gas flow signal changes.

.

DESCRIPTIONS OF MONITOR METHODS
Small manifold pressure change during exhaust gas 

recirculation (EGR) operation from closed to 
open.

.

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)

• EGR vacuum regulator solenoid valve monitor

Sensor (The sensor below is determined to be 

normal)

• Volume airflow sensor

• Engine coolant temperature sensor

• Intake air temperature sensor

• Barometric pressure sensor

• Throttle position sensor

• Manifold absolute pressure sensor

.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-602

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• At least 20 seconds have passed since the last 

monitor was complete.

• Engine coolant temperature is higher than 76°C 

(169

°F).

• Engine speed is at between 1,000 and 1,650 

<M/T> or 910 and 1,650 <A/T> r/min.

• Intake air temperature is higher than 10°C (50°F).

• Barometric pressure is higher than 76 kPa (11 

psi).

• Vehicle speed is 1.5 km/h (1.0 mph) <M/T> or 30 

km/h (19 mph) <A/T> or more.

• At least 90 seconds have passed since manifold 

differential pressure sensor output voltage fluctu-
ated 1.5 volts or more.

• The throttle valve is closed.

START

END

NO

NO

NO

YES

YES

YES

MALFUNCTION

GOOD

MONITORING

CONDITIONS

MEASURE MANIFOLD

PRESSURE (P1)

MEASURE MANIFOLD

PRESSURE (P2)

EGR VALVE OPEN

P2 - P1 < P0 *

SPECIFIED TIMES

AK204016

P0 : THRESHOLD VALUE