Mitsubishi Galant (2004+). Manual — part 1192
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-461
.
CIRCUIT OPERATION
• 5-volt voltage is applied to the fuel tank tempera-
ture sensor output terminal (terminal No. 3) from
the PCM (terminal No. 41) via the resistor in the
PCM.
• The fuel tank temperature sensor output voltage
increases when the resistance increases and
decreases when the resistance decreases. The
ground terminal (terminal No. 1) is grounded to
the vehicle body.
.
TECHNICAL DESCRIPTION
• The fuel tank temperature sensor converts the
fuel tank temperature to a voltage.
• The PCM detects the fuel tank temperature with
this output voltage.
.
DESCRIPTIONS OF MONITOR METHODS
Fuel tank temperature sensor output voltage is out of
specified range.
.
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)
• Engine coolant temperature sensor
• Intake air temperature sensor
.
AK303085
CONNECTOR: B-20
PCM
AB
AIR CLEANER
B-20
AK303086
CONNECTOR: C-25
C-25
AB
AK303087
SERVICE
HOLE
AB
FUEL PUMP MODULE
(INCORPORATING FUEL LEVEL
SENSOR (MAIN) AND FUEL
TANK TEMPERATURE SENSOR)
CONNECTOR: D-18
D-18 (GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-462
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 2 seconds or more have passed since the engine
starting sequence was completed.
Judgement Criteria
• Sensor output voltage has continued to be 4.6
volts or higher for 2 seconds.
.
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: )
• Fuel tank temperature sensor failed.
• Open fuel tank temperature sensor circuit, har-
ness damage, or connector damage.
• PCM failed.
START
MONITORING
CONDITIONS
END
NO
NO
NO
YES
YES
YES
MALFUNCTION
GOOD
OUTPUT VOLTAGE
< 0.1V
CONTINUOUS
FAILURE FOR 2secs
OUTPUT VOLTAGE
> 4.6V
NO
YES
AK302403
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-463
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 data list item
4A: Fuel Tank Temperature Sensor.
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 data reading mode for item
4A, Fuel Tank Temperature Sensor.
• Approximately the same as the ambient air temperature
when the engine is cooled.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
NO : Go to Step 2.
STEP 2. Check harness connector D-18 at the fuel tank
temperature sensor 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
. Then go to Step 11.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
1
2
3
4
5
AK303088
HARNESS
CONNECTOR:
COMPONENT SIDE
SERVICE
HOLE
AB
FUEL PUMP MODULE
(INCORPORATING FUEL LEVEL
SENSOR (MAIN) AND FUEL
TANK TEMPERATURE SENSOR)
CONNECTOR: D-18
D-18 (GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-464
STEP 3. Check the fuel tank temperature sensor.
(1) Disconnect the fuel tank temperature sensor connector
D-18.
(2) Measure the resistance between terminal No. 1 and No. 3
of the fuel tank temperature sensor.
Standard value:
0.5
− 12.0 kΩ
Q: Is the measured resistance between 0.5 and 12.0 k
Ω?
YES : Go to Step 4.
NO : Replace the fuel tank temperature sensor. Then go to
Step 11.
STEP 4. Check the sensor supply voltage at fuel tank
temperature sensor harness side connector D-18.
(1) Disconnect the connector D-18 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 3 and ground.
• Voltage should be between 4.5 and 4.9 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.5 and 4.9 volts?
YES : Go to Step 8.
NO : Go to Step 5.
1
2
3
4
5
AK303088
HARNESS
CONNECTOR:
COMPONENT SIDE
SERVICE
HOLE
AB
FUEL PUMP MODULE
(INCORPORATING FUEL LEVEL
SENSOR (MAIN) AND FUEL
TANK TEMPERATURE SENSOR)
CONNECTOR: D-18
D-18 (GR)
1
2 3
4
5
AK203165
FUEL TANK TEMPERATURE
SENSOR CONNECTOR
AB
1
2
3
4
5
AK303088
HARNESS
CONNECTOR:
COMPONENT SIDE
SERVICE
HOLE
AB
FUEL PUMP MODULE
(INCORPORATING FUEL LEVEL
SENSOR (MAIN) AND FUEL
TANK TEMPERATURE SENSOR)
CONNECTOR: D-18
D-18 (GR)
1
2
3
4
5
AK303091
D-18 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
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