Mitsubishi Lancer Evolution X. Manual - part 342

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-433

STEP 14. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function − OBD-II Drive Cycle − Pattern 4 

P.13A-9

.

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

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-434

DTC P0443:  Evaporative Emission Control System Purge Control Valve Circuit

2

1

AK704279

1

2

3 4 5 6 7 8 9 10 11 12 13 14 15 16

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

1

3

2

4

1 2 3

4 5 6

37

1

2

2

A-39

MU802607

B-12

MU802779

B-09

20A

WHITE

WHITE

WHITE

LIGHT GREEN

-RED

WHITE

A-34X

4

3

1

2

22

36

FUSIBLE LINK

OFF

ON

AD

RELAY BOX
(ENGINE COMPARTMENT)

ENGINE
CONTROL
MODULE

MFI
RELAY

TO ECM

EVAPORATIVE EMISSION PURGE SOLENOID CIRCUIT

EVAPORATIVE EMISSION
PURGE SOLENOID

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-435

.

CIRCUIT OPERATION

• The evaporative emission purge solenoid power 

is supplied from the MFI relay (terminal No. 2).

• The ECM controls ground evaporative emission 

purge solenoid by turning the power transistor in 
the ECM "ON" and "OFF".

.

TECHNICAL DESCRIPTION

• To judge if there is open circuit in the evaporative 

emission purge solenoid drive circuit, the ECM 
measures the surge voltage of the evaporative 
emission purge solenoid coil.

.

DESCRIPTIONS OF MONITOR METHODS

Off-surge does not occur after solenoid is operated 

from 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

.

AK704226

Connector: A-34X

MFI relay

A-34X

AB

AK704255AB

Connector: A-39

A-39 (B)

AK704227

Connector: B-09

ECM

B-09 (GR)

AB

AK704277

AB

Evaporative emission
purge solenoid

Connector: B-12

B-12 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-436

DTC SET CONDITIONS
Logic Flow Chart

Check Conditions

• Engine is being cranked.
• Battery positive voltage is between 10 and 16.5 

volts.

Judgement Criteria

• The evaporative emission purge solenoid coil 

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

• The ECM monitors for this condition once during 

the drive cycle.

Check Conditions

• Battery positive voltage is between 10 and 16.5 

volts.

• ON duty cycle of the evaporative emission purge 

solenoid is between 10 and 90 percent.

• Evaporative emission ventilation solenoid is off.
• 1 second or more has elapsed after the above 

mentioned conditions have been met. 

Judgement Criterion

• The evaporative emission purge solenoid coil 

surge voltage (battery positive voltage + 2 volts) 
is not detected for 1 second after the evaporative 
emission purge solenoid is turned off.

.

FAIL-SAFE AND BACKUP FUNCTION

• None

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function − OBD-II Drive Cycle − 

Pattern 23 

P.13A-9

.

.

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, harness damage, or connector 
damage.

• ECM failed. 

End

No

No

Was surge voltage 

(> VB + 2V) detected?

Good

AK604339

Malfunction

Start

Yes

Yes

Monitoring
conditions