Mitsubishi Eclipse. Manual — part 610

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-983

STEP 7. Check the fuel pressure.
Refer to, Fuel Pressure Test

P.13B-1106

.

Q: Is the fuel pressure normal?

YES : Check the following items, and repair or replace the

defective items.

a. Vacuum leak.

• Broken intake manifold gasket.

• Broken air intake hose.

• Broken vacuum hose.

• Positive crankcase ventilation valve does

not operate.

b. Injector clogged.

Then confirm that the malfunction symptom is

eliminated.

NO : Repair or replace. Then confirm that the malfunction

symptom is eliminated.

STEP 8. Check the fuel pressure.
Refer to, Fuel Pressure Test

P.13B-1106

.

Q: Is the fuel pressure normal?

YES : Check the following items, and repair or replace the

defective items.

a. Check the ignition coil, spark plugs, spark plug

cables.

b. Check the EGR system.

Then confirm that the malfunction symptom is

eliminated.

NO : Repair or replace. Then confirm that the malfunction

symptom is eliminated.

INSPECTION PROCEDURE 20: Knocking

.

COMMENT

• Incase such as the above, the cause is probably

that the detonation control is defective or the heat
value of the spark plug is inappropriate.

.

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

• Defective knock sensor

• Incorrect heat value of the spark plug.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (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) <3.0L>

13B-984

STEP 1. Using the scan tool MB991958, read the
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 DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC set?

YES : Refer to, Diagnostic Trouble Code Chart

P.13B-23

.

NO : Go to Step 2.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-985

STEP 2. Check the ignition timing.
(1) The ignition timing should retard more when knock sensor

connector B-35 is disconnected than when it is connected.

Q: When the knock sensor connector B-35 was

disconnected, was the ignition timing delayed?
YES : Check the following items, and repair or replace the

defective items.

a. Check the spark plugs.
b. Fuel quality, octane level.

c. Check if the foreign materials (water,

kerosene, etc.) got into fuel.

Then confirm that the malfunction symptom is

eliminated.

NO : Refer to, DTC P0325

− Knock Sensor Circuit

P.13B-548

.

AK300444

1

2

AB

B-35 (GR)

CONNECTOR: B-35 <WITHOUT INTAKE
MANIFOLD TUNING SYSTEM>

KNOCK SENSOR

HARNESS
CONNECTOR:
COMPONENT SIDE

AK300749

1

2

KNOCK SENSOR

CONNECTOR: B-35 <WITH INTAKE
MANIFOLD TUNING SYSTEM>

AB

B-35 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-986

INSPECTION PROCEDURE 21: Dieseling.

.

COMMENT

• Fuel leakage from injectors is suspected, or car-

bon build up.

.

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

• Fuel leakage from injectors.

DIAGNOSIS

STEP 1. Check the injectors for fuel leakage.
Replace the leaking injector. Then confirm that the malfunction

symptom is eliminated.

INSPECTION PROCEDURE 22: Too high CO and HC concentration when idling

.

COMMENT

• Abnormal air/fuel ratio is suspected.

.

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

• Malfunction of air/fuel ratio control system.

• Deteriorated catalyst.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

STEP 1. Using scan tool MB991958, read the 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 DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC set?

YES : Refer to, Diagnostic Trouble Code Chart

P.13B-23

.

NO : Go to Step 2.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824