Mitsubishi Galant 9G. Manual — part 799
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-638
.
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).
.
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
.
AK303868AB
EVAPORATIVE
EMISSION
VENTILATION
SOLENOID
CONNECTOR: F-08
F-08 (B)
AK303147
CONNECTOR: B-19
PCM
AB
AIR CLEANER
B-19 (B)
AK303803AB
CONNECTOR: B-17X
MFI RELAY
B-17X
AK303872AB
A-13 (GR)
CONNECTOR: A-13
AK303838AB
C-25
CONNECTOR: C-25
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-639
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 at 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.
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
.
.
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.
MONITORING
CONDITIONS
NO
NO
YES
YES
GOOD
MALFUNCTION
WAS SURGE VOLTAGE
(> V
B
+2V) DETECTED?
START
END
AK302039
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-640
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
.
NO : Go to Step 2.
STEP 2. Check harness connector F-08 at the evaporative
emission ventilation 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
. Then go to Step 12.
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AK303873
1
2
AB
CONNECTOR: F-08
F-08 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-641
STEP 3. Check the evaporative emission ventilation
solenoid.
(1) Disconnect the evaporative emission ventilation solenoid
connector F-08.
(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 measured resistance between 17 and 21 ohms [at
20
°C (68°F)]?
YES : Go to Step 4.
NO : Replace it. Then go to Step 12.
STEP 4. Measure the power supply voltage at evaporative
emission ventilation solenoid harness side connector
F-08.
(1) Disconnect the connector F-08 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 2 and ground.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 6.
NO : Go to Step 5.
AK303873
1
2
AB
CONNECTOR: F-08
F-08 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
1 2
AK202969
EVAPORATIVE EMISSION
VENTILATION SOLENOID
CONNECTOR
AB
AK303873
1
2
AB
CONNECTOR: F-08
F-08 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
AK202972
F-08 HARNESS
CONNECTOR:
COMPONENT SIDE
AC
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