Mitsubishi Eclipse. Manual — part 249

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-489

STEP 18. Test the OBD-II drive cycle.
(1) Confirm the repair by performing the appropriate drive cycle

(Refer to Diagnostic Function

− OBD-ll Drive Cycle −

Procedure 1

− Evaporative Emission System Leak Monitor

P.13A-5

).

(2) Read the diagnostic trouble code.
Q: Is diagnostic trouble code P0442 set?

YES : Go to Step 1.
NO : This diagnosis is complete.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-490

DTC P0443: Evaporative Emission Control System Purge Control Valve Circuit

AK101519

RED

-

WHITE

RED

-

WHITE

RED

-

WHITE

RED

2

1

BL

UE

BATTERY

MFI
RELAY

4

3

1

2

9 <M/T>
34 <A/T>

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

B-33
MU802779

EVAPORATIVE
EMISSION
PURGE
SOLENOID

1

2

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

14

4

19

5

22

6

17

8

15

9

18

7

20

16

2

13

12

23 24 25 26

21

1

3

10

C-59 <M/T>
(MU803773)

C-50 <A/T>
(MU803784)

10 11

Evaporative Emission Purge Solenoid Circuit

3 4

1 2

A-18X

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-491

.

CIRCUIT OPERATION

• Power to the evaporative emission purge sole-

noid power is supplied from the MFI relay (termi-
nal No. 4).

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

evaporative emission purge 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 evaporative

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

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

rative emission purge 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.

.

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

from 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

.

AK300055

EVAPORATIVE
EMISSION PURGE
SOLENOID VALVE

AC

B-33 (B)

CONNECTOR: B-33

AK300060

ECM

CONNECTOR: C-49 <M/T>

AC

C-49 (G)

AK300060AD

C-50 (GR)

PCM

CONNECTOR: C-50 <A/T>

AK300121

MFI RELAY

CONNECTOR: A-18X

AB

A-18X

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-492

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 purge 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 of the evaporative emission purge

solenoid is between 10 and 90 percent.

• ON duty cycle of the EGR vacuum regulator sole-

noid valve 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 evaporative emission purge solenoid coil

surge voltage (battery positive voltage + 2 volts)
is not detected for 1 second. When the evapora-
tive emission purge 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 purge solenoid failed.

• Open or shorted evaporative emission purge

solenoid circuit, or harness damage, or connector
damage.

• ECM failed. <M/T>

• PCM failed. <A/T>

MONITORING

CONDITIONS

NO

NO

YES

YES

GOOD

MALFUNCTION

WAS SURGE VOLTAGE

(> V

B

+2V) DETECTED?

START

END

AK301449