Mitsubishi Eclipse. Manual — part 253

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-505

.

CIRCUIT OPERATION

• The evaporative emission ventilation solenoid

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

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

evaporative emission ventilation solenoid ground
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 evaporative

emission ventilation solenoid drive circuit, ECM
<M/T> or PCM <A/T> measures the surge volt-
age of the evaporative emission ventilation sole-
noid coil.

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

rative emission ventilation solenoid for 30 milli-
seconds. After the solenoid 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.

AK300121

MFI RELAY

CONNECTOR: A-18X

AB

A-18X

AK300115

CONNECTOR: D-10

EVAPORATIVE EMISSION
VENTILATION SOLENOID

AB

D-10 (B)

AK300066

CONNECTOR: D-16

AB

D-16 (B)

AK300119

CONNECTOR: C-28

AB

C-28

AK300118

CONNECTOR: C-90

AB

C-90

AK300060

ECM

CONNECTOR: C-56 <M/T>

AF

C-56 (G)

AK300060AD

C-50 (GR)

PCM

CONNECTOR: C-50 <A/T>

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-506

.

DESCRIPTIONS OF MONITOR METHODS
Off-surge does not occur after solenoid is operated

on to off.

.

MONITOR EXECUTION
Once per driving cycle

.

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

.

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 evaporative emission ventilation 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

16.5 volts.

• ON duty cycle the evaporative emission purge

solenoid is 0 percent.

• ON duty cycle of the EGR vacuum regulator sole-

noid valve is 0 percent.

• Evaporative emission ventilation solenoid is ON.

• More than 1 second has elapsed after the above

mentioned conditions have been met.

MONITORING

CONDITIONS

NO

NO

YES

YES

GOOD

MALFUNCTION

WAS SURGE VOLTAGE

(> V

B

+2V) DETECTED?

START

END

AK301449

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-507

Judgment Criteria

• The evaporative emission ventilation solenoid

coil surge voltage (battery positive voltage + 2
volts) is not detected for 1 second. When the
evaporative emission ventilation solenoid is
turned OFF.

.

OBD-ll DRIVE CYCLE PATTERN
Refer to Diagnostic Function

− OBD-ll Drive Cycle −

Procedure 6

− Other Monitor

P.13A-5

.

.

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

• Evaporative emission ventilation solenoid failed.

• Open or shorted evaporative emission ventilation

solenoid circuit, or harness damage, or connector
damage.

• ECM failed. <M/T>

• PCM failed. <A/T>

DIAGNOSIS

Required Special Tools:

• MB991958 (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 29: Evaporative Emission Ventilation 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

29, Evaporative emission ventilation solenoid.

• An operation sound should be heard and vibration

should be felt when the evaporative emission ventilation
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.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-508

STEP 2. Check connector D-10 at the evaporative emission
ventilation 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.

STEP 3. Check the evaporative emission ventilation
solenoid.
(1) Disconnect the evaporative emission ventilation solenoid

connector D-10.

(2) Measure the resistance between evaporative emission

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

Standard value: 17

− 21 ohms [at 20°C (68°F)]

Q: Is the resistance between 17 and 21 ohms?

YES : Go to Step 4.
NO : Replace the over vent valve module. Then go to Step

12.

AK300452

1

2

CONNECTOR: D-10

AB

D-10 (B)

HARNESS CONNECTOR:
COMPONENT SIDE

AK300452

1

2

CONNECTOR: D-10

AB

D-10 (B)

HARNESS CONNECTOR:
COMPONENT SIDE

AK000004

2

1

EVAPORATIVE EMISSION
VENTILATION SOLENOID

AB