Mitsubishi Eclipse. Manual - part 208

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-325

STEP 8. Check connector C-56 at ECM <M/T> or connector 
C-50 at PCM <A/T> for damage.
Q: Is the connector in good condition?

YES : Go to Step 9.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 12.

AK300414

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C-50 (GR)

CONNECTOR: C-50 <A/T>

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AK300416

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53 52 51

55 54

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57

CONNECTOR: C-56 <M/T>

C-56 (G)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AK300414

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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-326

STEP 9. Check for harness damage between MFI relay 
connector A-18X (terminal No. 4) and heated oxygen 
sensor (rear) connector C-23 (terminal No. 5).
Q: Is the harness wire in good condition?

YES : Go to Step 10.
NO :  Repair it. Then go to Step 12.

AK300454

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1

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CONNECTOR: A-18X

AB

A-18X

HARNESS CONNECTOR:
COMPONENT SIDE

AK300405

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1

6 5 4 3

AB

C-23

HEATED OXYGEN
SENSOR (REAR)

CONNECTOR: C-23

HARNESS 
CONNECTOR:
HARNESS SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-327

STEP 10. Check for harness damage between heated 
oxygen sensor (rear) connector C-23 (terminal No. 6) and 
ECM connector C-56 (terminal No. 54) <M/T> or PCM 
connector C-50 (terminal No. 26) <A/T>.
Q: Is the harness wire in good condition?

YES : Go to Step 11.
NO :  Repair it. Then go to Step 12.

AK300405

2

1

6 5 4 3

AB

C-23

HEATED OXYGEN
SENSOR (REAR)

CONNECTOR: C-23

HARNESS 
CONNECTOR:
HARNESS SIDE

AK300416

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53 52 51

55 54

56

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62

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CONNECTOR: C-56 <M/T>

C-56 (G)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-328

STEP 11. Check the trouble symptoms.
(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 P0141 set?

YES : Replace the ECM or PCM. Then go to Step 12.
NO :  It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

P.00-6

.

STEP 12. 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 P0141 set?

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

DTC P0171: System too Lean

.

System too Lean Circuit

• Refer to, DTC P0201 − P0204 Injector Circuit 

Malfunction. 

P.13A-377

.

CIRCUIT OPERATION

• Refer to, DTC P0201 − P0204 Injector Circuit 

Malfunction. 

P.13A-377

.

TECHNICAL DESCRIPTION

• If a malfunction occurs in the fuel system, the fuel 

trim value becomes too large.

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

the fuel trim value is within a specified range.

.

DESCRIPTIONS OF MONITOR METHODS
Air/fuel learning value (long term fuel trim) and 

air/fuel feedback integral value (short term fuel 
trim) are too lean.

.

MONITOR EXECUTION
Continuous

.

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C-50 (GR)

CONNECTOR: C-50 <A/T>

AB

HARNESS CONNECTOR:
COMPONENT SIDE