Mitsubishi Eclipse. Manual - part 516

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-607

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, check actuator test 
item 10: EGR vacuum regulator solenoid valve.

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) Set scan tool MB991958 to the actuator test mode for item 

10, EGR vacuum regulator solenoid valve.

• An operation sound should be heard and vibration 

should be felt when the EGR vacuum regulator solenoid 
valve is operated.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the solenoid 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.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-608

STEP 2. Check connector B-31 at the EGR vacuum 
regulator solenoid valve for damage.
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 12.

AK300436

1

2

CONNECTOR: B-31 <WITHOUT INTAKE 
MANIFOLD TUNING  SYSTEM>

AB

B-31 (BR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK300430

1

2

CONNECTOR: B-31 <WITH INTAKE 
MANIFOLD TUNING  SYSTEM>

AB

B-31 (BR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-609

STEP 3 Check the EGR vacuum regulator solenoid valve.
(1) Disconnect the EGR vacuum regulator solenoid valve 

connector B-31.

(2) Measure the resistance between EGR vacuum regulator 

solenoid valve side connector terminal No. 1 and No. 2.

   Standard value: 29 

− 35 ohms [at 20°C (68°F)]

Q: Is the resistance between 29 and 35 ohms?

YES : Go to Step 4.
NO :  Replace the EGR vacuum regulator solenoid valve. 

Then go to Step 12.

AK300436

1

2

CONNECTOR: B-31 <WITHOUT INTAKE 
MANIFOLD TUNING  SYSTEM>

AB

B-31 (BR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK300430

1

2

CONNECTOR: B-31 <WITH INTAKE 
MANIFOLD TUNING  SYSTEM>

AB

B-31 (BR)

HARNESS CONNECTOR:
COMPONENT SIDE

AKX00352

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-610

STEP 4. Check the power supply voltage at EGR vacuum 
regulator solenoid valve harness side connector B-31.
(1) Disconnect the connector B-31 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.

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 

A-18X (terminal No. 4) and EGR vacuum regulator 
solenoid valve connector B-31 (terminal No. 1) 
because of open circuit or short circuit to ground. 
Then go to Step 12.

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

Connector Inspection 

P.00E-2

. Then go to Step 12.

AK300436

1

2

CONNECTOR: B-31 <WITHOUT INTAKE 
MANIFOLD TUNING  SYSTEM>

AB

B-31 (BR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK300430

1

2

CONNECTOR: B-31 <WITH INTAKE 
MANIFOLD TUNING  SYSTEM>

AB

B-31 (BR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK000254AM

B-31 HARNESS 
CONNECTOR: C
OMPONENT SIDE

2 1

AK300454

2

1

3

4

CONNECTOR: A-18X

AB

A-18X

HARNESS CONNECTOR:
COMPONENT SIDE