Mitsubishi Galant (2004+). Manual - part 1243

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-665

DTC P0443: Evaporative Emission Control Evaporative Emission Control System Purge Control Valve 
Circuit

RED-

WHITE

RED-

WHITE

BLUE

AK302861

RED

MFI RELAY

BATTERY

149

2

4

B-17X

1

3

1

2

POWERTRAIN
CONTROL
MODULE (PCM)

EVAPORATIVE EMISSION
PURGE SOLENOID

Evaporative Emission Purge Solenoid Circuit

1 2

B-05

(MU802779)

B-23

RED-

WHITE

1

2

3

4

121 122 123 124 125 126 127

128 129 130 131 132 133

134 135 136 137 138 139 140

141 142 143 144 145 146

147 148 149 150 151 152 153

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-666

.

CIRCUIT OPERATION

• The evaporative emission purge solenoid power 

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

• The PCM controls ground evaporative emission 

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

.

TECHNICAL DESCRIPTION

• To judge if there is open circuit in the evaporative 

emission purge solenoid drive circuit, the PCM 
measures the surge voltage of the evaporative 
emission ventilation 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

.

1

2

3

4

1

2

3

4

1

2

3

4

1

2

3

4

AK303014

CONNECTOR: B-17X

MFI RELAY

MFI RELAY

FRONT OF VEHICLE

B-17X

AB

AK303026

EVAPORATIVE
EMISSION PURGE
SOLENOID

CONNECTOR: B-05

B-05 (B)

AB

AK303059

CONNECTOR: B-23

PCM

AB

AIR CLEANER

B-23

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-667

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Engine is being cranked.

• Battery positive voltage is 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 PCM 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.

• 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 after the evaporative 
emission purge solenoid is turned off.

.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Procedure 6 

− Other Monitor 

P.13B-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, harness damage, or connector 
damage.

• PCM failed.

MONITORING

CONDITIONS

NO

NO

YES

YES

GOOD

MALFUNCTION

WAS SURGE VOLTAGE

(> VB+2V) DETECTED?

START

END

AK302405

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-668

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

• MB991923: Power Plant ECU Check Harness

STEP 1. Using scan tool MB991958, check actuator test 
item 08: Evaporative Emission Purge 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 

08, Evaporative emission purge solenoid.

• An operation sound should be heard and vibration 

should be felt when the evaporative emission purge 
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 harness connector B-05 at the evaporative 
emission purge solenoid for damage.

Q: Is the harness 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.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

1

2

AK303142

CONNECTOR: B-05

B-05 (B)

HARNESS
CONNECTOR:
COMPONENT SIDE

AB