Mitsubishi Eclipse. Manual - part 495

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-523

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Engine is running.

Judgment Criteria

• Injector coil surge voltage (battery positive volt-

age + 2 volts) has not been detected for 2 sec-
onds.

.

OBD-ll DRIVE CYCLE PATTERN
Refer to , Diagnostic Function 

− OBD-ll Drive Cycle − 

Procedure 6 

− Other Monitor 

P.13B-7

.

.

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

• Injector failed.

• Open or shorted injector circuit harness damage, 

or connector damage.

• ECM failed. <M/T>

• PCM failed. <A/T>

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

• MB991348: Test Harness

START

END

NO

NO

NO

YES

YES

YES

MALFUNCTION

GOOD

MONITORING

CONDITIONS

CONTINUOUS

FAILURE FOR 2secs

INJ. SURGE V < V

B

 + 2.0 V

AK204052

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-524

STEP 1. Using scan tool MB991958, check actuator test 
item 02, 04, 06: Injectors.

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) Start the engine and run at idle.
(3) Set scan tool MB991958 to the actuator testing mode for 

item 02, 04, 06 Injectors.

(4) Warm up the engine to normal operating temperature: 80

°C 

to 96

°C (176°F to 205°F).

• Does the idle state worsen when the injector is cut off. 

(Does idling become unstable or does the engine stall)

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the actuator operating properly?

YES : It can be assumed that this malfunction is intermittent. 

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

P.00-6

.

NO :  Go to Step 2.

STEP 2. Check the connector at injector for damage.

a. Check the connector B-02 when checking No. 2 cylinder.
b. Check the connector B-06 when checking No. 4 cylinder.

c. Check the connector B-25 when checking No. 6 cylinder.

Q: Is the connector in good condition?

YES : Go to Step 3.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 10.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

AK300753

1

2

CONNECTORS: B-02, B-06, B-25

AB

B-02 (GR)

B-06 (GR) B-25 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-525

STEP 3. Check the injector.
(1) Disconnect the injector connector B-02 <No. 2 cylinder> or 

B-06 <No. 4 cylinder> or B-25 <No. 6 cylinder>.

(2) Measure the resistance between injector side connector 

terminal No. 1 and No. 2.

 Standard value: 13 

− 16 ohms [at 20°C (68°F)]

Q: Is the resistance between 13 and 16 ohms?

YES : Go to Step 4.
NO :  Replace the injector. Then go to Step 10.

STEP 4. Check the power supply voltage at injector 
connector.
(1) Disconnect connector B-02 <No. 2 cylinder> or B-06 <No.  

4 cylinder> or B-25 <No. 6 cylinder> and measure at the 
harness side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 1 and ground.

• Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts) 

present?
YES : Go to Step 6.
NO :  Go to Step 5.

AK300753

1

2

CONNECTORS: B-02, B-06, B-25

AB

B-02 (GR)

B-06 (GR) B-25 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK000241

INJECTOR SIDE
CONNECTOR

1 2

AB

AK300753

1

2

CONNECTORS: B-02, B-06, B-25

AB

B-02 (GR)

B-06 (GR) B-25 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK000323

HARNESS SIDE
CONNECTOR

2 1

AK000323AC

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-526

STEP 5. Check connector A-18X at MFI relay for damage.
Q: Is the connector in good condition?

YES : Repair harness wire between MFI relay connector 

and injector connector because of open circuit or 
short circuit to ground.

a. Repair harness wire between MFI relay 

connector A-18X (terminal No. 4) and injector 
connector B-02 (terminal No. 1) when 
checking No. 2 cylinder.

b. Repair harness wire between MFI relay 

connector A-18X (terminal No. 4) and injector 
connector B-06 (terminal No. 1) when 
checking No. 4 cylinder.

c. Repair harness wire between MFI relay 

connector A-18X (terminal No. 4) and injector 
connector B-25 (terminal No. 1) when 
checking No. 6 cylinder.

Then go to Step 10.

NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 10.

STEP 6. Check for harness damage between MFI relay 
connector and injector connector.

a. Check the harness wire between MFI relay connector 

A-18X (terminal No. 4) and injector connector B-02 (termi-
nal No. 1) when checking No. 2 cylinder.

b. Check the harness wire between MFI relay connector 

A-18X (terminal No. 4) and injector connector B-06 (termi-
nal No. 1) when checking No. 4 cylinder.

c. Check the harness wire between MFI relay connector 

A-18X (terminal No. 4) and injector connector B-25 (termi-
nal No. 1) when checking No. 6 cylinder.

Q: Is the harness wire in good condition?

YES : Go to Step 7.
NO :  Repair it. Then go to Step 10.

AK300454

2

1

3

4

CONNECTOR: A-18X

AB

A-18X

HARNESS CONNECTOR:
COMPONENT SIDE

AK300454

2

1

3

4

CONNECTOR: A-18X

AB

A-18X

HARNESS CONNECTOR:
COMPONENT SIDE

AK300753

1

2

CONNECTORS: B-02, B-06, B-25

AB

B-02 (GR)

B-06 (GR) B-25 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE