Mitsubishi Eclipse. Manual - part 575

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-843

NOTE: Check harness after checking intermediate connector 
B-13. If intermediate connector is damaged, repair or replace 
them. Refer to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Then go to Step 10.

Q: Is the harness wire in good condition?

YES : Replace the generator. Then go to Step 10.
NO :  Repair it. Then go to Step 10.

STEP 10. 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) Start the engine and run at idle.
(3) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P0622 set?

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

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-844

DTC P0660: Intake Manifold Tuning Circuit Malfunction

AK301821

RED-

WHITE

RED-

WHITE

RED-

WHITE

RED

2

1

BLUE-

BLA

CK

BATTERY

MFI
RELAY

4

3

1

2

32 <M/T>
53 <A/T>

ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>

      B-49
(MU802722)

INTAKE MANIFOLD
TUNING SOLENOID

2

1

C-51 <M/T>
(MU803784)

2

3 4

5 6

7 8

9

11 12 13 14 15 16 17 18 19 20

30

21 22 23

24 25

26 27 28 29

3132 33

34 35

1

10

Intake Manifold Tuning Solenoid Circuit

3 4

1 2

A-18X

C-55 <A/T>
(MU803781)

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

AK300103

INTAKE MANIFOLD
TUNING SOLENOID

CONNECTOR: B-49

AB

B-49 (B)

AK300244

CONNECTOR: C-55 <A/T>

AG

PCM

C-55 (GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-845

.

CIRCUIT OPERATION

• Power to the intake manifold tuning solenoid 

power is supplied from the MFI relay (terminal 
No. 4).

• The ECM <M/T> or PCM <A/T> controls ground 

intake manifold tuning solenoid by turning the 
power transistor in the ECM <M/T> or PCM 
<A/T> "ON" and "OFF".

.

TECHNICAL DESCRIPTION

• To judge if there is open circuit in the intake man-

ifold tuning solenoid drive circuit, ECM <M/T> or 
PCM <A/T> measures the surge voltage of the 
intake manifold tuning solenoid coil.

• The ECM <M/T> or PCM <A/T> drives the intake 

manifold tuning solenoid. After the solenoid is 
turned off, the ECM <M/T> or PCM <A/T> will 
check if the solenoid coil produces a surge volt-
age of 2 volts or more.

.

DTC SET CONDITIONS

Check Conditions

• Engine is being cranked.

• Battery positive voltage is at between 10 and 16 

volts.

Judgment Criteria

• The intake manifold tuning solenoid coil surge 

voltage (battery positive voltage + 2 volts) is not 
detected for 0.2 second.

• The ECM <M/T> or PCM <A/T> monitors for this 

condition once during the drive cycle.

Check Conditions

• Battery positive voltage is at between 10 and 16 

volts.

• Intake manifold tuning solenoid is ON.

• More than 1 second has elapsed after the above 

mentioned conditions have been met. 

Judgment Criteria

• The intake manifold tuning solenoid coil surge 

voltage (battery positive voltage + 2 volts) is not 
detected for 1 second. When the intake manifold 
tuning solenoid is turned OFF.

.

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

• Intake manifold tuning solenoid failed.

• Open or shorted intake manifold tuning solenoid 

circuit, 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

AK300091

CONNECTOR: C-51 <M/T>

ECM

AF

C-51 (GR)

AK300121

MFI RELAY

CONNECTOR: A-18X

AB

A-18X

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-846

STEP 1. Using scan tool MB991958, check actuator test 
item 11: Variable Induction control Solenoid.

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 

11, Intake manifold tuning solenoid.

• An operation sound should be heard and vibration 

should be felt when the intake manifold tuning solenoid 
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.

STEP 2. Check connector B-49 at the intake manifold 
tuning solenoid 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.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

AK300078

3

4

5

1

2

6

7

CONNECTOR: B-14

AB

B-14 (B)

HARNESS 
CONNECTOR:
COMPONENT SIDE