Mitsubishi Galant 9G. Manual - part 1100

 

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Mitsubishi Galant 9G. Manual - part 1100

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-700

DTC P0446: Evaporative Emission Control System Vent Control Circuit

1

2

3

4

1 2 3 4

5 6 7

8 9 10 11

12 13 14

15 16 17 18

AK400893

RED-

WHITE

RED-

WHITE

MFI RELAY

BATTERY

2

2

4

2

B-17X

A-13

C-25

1

3

1

2

POWERTRAIN
CONTROL
MODULE (PCM)

1 2

F-08

MU802779

EVAPORATIVE
EMISSION
VENTILATION
SOLENOID

Evaporative Emission Ventilation Solenoid Circuit

RED

RED

RED

9

12

YELLO

W

YELLO

W

B-19

TO PCM

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-701

.

CIRCUIT OPERATION

• The evaporative emission ventilation solenoid 

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

• The PCM controls the evaporative emission ven-

tilation solenoid ground by turning the power tran-
sistor in the PCM ON and OFF.

.

TECHNICAL DESCRIPTION

• To judge if there is open circuit in the evaporative 

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

• The PCM drives the evaporative emission venti-

lation solenoid. After the solenoid is turned off, 
the PCM will check if the solenoid coil produces a 
surge voltage (battery positive voltage + 2 volts).

.

AK303146

CONNECTOR: F-08

AB

EVAPORATIVE
EMISSION
VENTILATION
SOLENOID

EVAPORATIVE
EMISSION
CANISTER

F-08 (B)

AK303147

CONNECTOR: B-19

PCM

AB

AIR CLEANER

B-19 (B)

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

AK303148

CONNECTOR: A-13

AB

A-13(GR)

AK303086

CONNECTOR: C-25

C-25

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-702

DESCRIPTIONS OF MONITOR METHODS

Off-surge does not occur after solenoid is operated 

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

.

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 ventilation 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 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

(> VB+2V) DETECTED?

START

END

AK302405

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-703

Judgment Criteria

• The evaporative emission ventilation solenoid 

coil surge voltage (battery positive voltage + 2 
volts) is not detected for 1 second after the evap-
orative emission ventilation solenoid is turned 
OFF.

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Procedure 6 

− Other Monitor 

P.13B-6

.

.

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, harness damage, or connector 
damage.

• PCM failed. 

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 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 

− How to 

Cope with Intermittent Malfunctions 

P.00-14

.

NO :  Go to Step 2.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

 

 

 

 

 

 

 

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