Mitsubishi Eclipse. Manual - part 515

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-603

• Volumetric efficiency is lower than 18 <M/T> or 

28 <A/T> percent.

• While fuel is being shut off. <M/T>

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

condition for 3 cycles of 2 seconds each during 
the drive cycle.

Judgement Criteria

• When intake manifold pressure fluctuations width 

is lower than 2.6 kPa (0.38 psi). When the EGR 
vacuum regulator solenoid valve is turned ON.

.

OBD-ll DRIVE CYCLE PATTERN
Refer to Diagnostic Function 

− OBD-ll Drive Cycle − 

Procedure 5 

− Exhaust Gas Recirculation (EGR) 

System Monitor 

P.13B-7

.

.

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

• EGR valve does not open.

• EGR control vacuum is too low.

• EGR vacuum regulator solenoid valve failed.

• Manifold Absolute pressure sensor failed.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

STEP 1. Check the EGR system.
Refer to GROUP 17, Emission Control System 

− Exhaust Gas 

Recirculation (EGR) System 

− EGR System Check 

P.17-112

.

Q: Are there any abnormalities?

YES : Repair it. Then go to Step 3.
NO :  Go to Step 2.

STEP 2. Using scan tool MB991958, check data list item 95: 
Manifold Differential Pressure Sensor.

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 data reading mode for item 

95, Manifold Absolute Pressure Sensor.

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

°C 

to 96

°C (176°F to 205°F).

• Should be between 62 − 76 kPa  (18.3 - 22.4 in.Hg) at 

engine idling.

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

YES : Clean the EGR valve and EGR passage. Then go to 

Step 3.

NO :  Refer to DTC P0106 

− Manifold Differential Pressure 

Sensor Circuit Range/Performance Problem 

P.13B-53

, P0107 

− Manifold Differential Pressure 

Sensor Circuit Low Input 

P.13B-68

, DTC P0108 

− 

Manifold Differential Pressure Sensor Circuit High 
Input 

P.13B-89

.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-604

STEP 3. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to 

Procedure 5 

− Exhaust Gas Recirculation (EGR) System 

Monitor 

P.13B-7

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0401 set?

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

DTC P0403: EGR Control Circuit

AK301820

RED-

WHITE

RED-

WHITE

RED-

WHITE

1 2

BLUE-RED

RED

BATTERY

MFI
RELAY

EGR VACUUM REGULATOR
SOLENOID VALVE

4

1

2

3

1

2

6

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

B-31

C-51 <M/T>, C-52 <A/T>
         (MU803784)

2

3 4

5 6

7 8

9

11 12 13 14 15 16 17 18 19 20

30

2122 23

24 25

26 27 28 29

31 32 33

34 35

1

10

EGR Vacuum Regulator Solenoid Valve Circuit

3 4

1 2

A-18X

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-605

.

CIRCUIT OPERATION

• The EGR vacuum regulator solenoid valve power 

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

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

vacuum regulator solenoid valve ground by turn-
ing 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 EGR vac-

uum regulator solenoid valve drive circuit, ECM 
<M/T> or PCM <A/T> measures the surge volt-
age of the EGR vacuum regulator solenoid valve 
coil.

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

vacuum regulator solenoid valve. After the sole-
noid is turned off, the ECM <M/T> or PCM <A/T> 
will check if the solenoid coil produces a surge 
voltage of 2 volts or more.

.

DESCRIPTIONS OF MONITOR METHODS
Off-surge does not occur after stepper motor is oper-

ated on to off.

.

MONITOR EXECUTION
Continuous

.

MONITOR EXECUTION CONDITIONS (Other 
monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.

AK300082

EGR
VACUUM
REGULATOR
SOLENOID
VALVE

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

AB

B-31 (BR)

AK300076

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

AB

EGR 
VACUUM 
REGULATOR 
SOLENOID
VALVE

B-31 (BR)

AK300244

CONNECTOR: C-52 <A/T>

AC

PCM

C-52 (GR)

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-606

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Engine is being cranked.

• Battery positive voltage is at between 10 and 

16.5 volts.

Judgment Criteria

• The EGR vacuum regulator solenoid valve 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.

• ON duty cycle of the EGR vacuum regulator sole-

noid valve is between 10 and 90 percent.

• ON duty cycle of the evaporative emission purge 

solenoid is 0 percent.

• Evaporative emission ventilation solenoid is OFF.

• More than 1 second has elapsed after the above 

mentioned conditions have been met. 

Judgment Criteria

• The EGR vacuum regulator solenoid valve coil 

surge voltage (battery positive voltage + 2 volts) 
is not detected for 1 second. When the EGR vac-
uum regulator solenoid valve is turned OFF.

.

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: )

• EGR vacuum regulator solenoid valve failed.

• Open or shorted EGR vacuum regulator solenoid 

valve circuit, or harness damage, or connector 
damage.

• ECM failed. <M/T>

• PCM failed. <A/T>

START

END

MALFUNCTION

GOOD

MONITORING

CONDITIONS

WAS SURGE VOLTAGE

(> V

B

+2V) DETECTED?

NO

NO

YES

YES

AK302601