Mitsubishi Galant 9G. Manual — part 1038
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-452
Judgement Criteria
• The fuel tank temperature − engine coolant tem-
perature is 15
°C (27°F) or more when the engine
is started.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Procedure 6
− Other Monitor
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are: )
• Fuel tank temperature sensor failed.
• Open or shorted fuel tank temperature sensor cir-
cuit, harness damage, or connector damage.
• PCM failed.
NOTE: A diagnostic trouble code (DTC) could be
output if the engine and the radiator have been
flushed repeatedly when the engine coolant temper-
ature was high (or the fuel tank temperature was
high). Because this is not a failure, the DTC must be
erased.
Make sure to test drive the vehicle in accordance
with the OBD-II drive cycle pattern in order to verify
that a DTC will not be output.
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
− How to
Cope with Intermittent Malfunctions
.
NO : Go to Step 2.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-453
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
. Then go to Step 12.
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 12.
AK303840
1
2
3
4
5
SERVICE
HOLE
AB
CONNECTOR: D-18
D-18 (GR)
HARNESS
CONNECTOR:
COMPONENT SIDE
AK303840
1
2
3
4
5
SERVICE
HOLE
AB
CONNECTOR: D-18
D-18 (GR)
HARNESS
CONNECTOR:
COMPONENT SIDE
1
2 3
4
5
AK203165
FUEL TANK TEMPERATURE
SENSOR CONNECTOR
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-454
STEP 4. Check the continuity at fuel tank temperature
sensor harness side connector D-18.
(1) Disconnect the connector D-18 and measure at the harness
side.
(2) Check for the continuity between terminal No. 1 and
ground.
• Should be less than 2 ohms.
Q: Does continuity exist?
YES : Go to Step 5.
NO : Repair harness wire between fuel tank temperature
sensor connector D-18 (terminal No. 1) and ground
because of open circuit or harness damage. Then go
to Step 12.
STEP 5. Measure 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 6.
NO : Go to Step 10.
AK303840
1
2
3
4
5
SERVICE
HOLE
AB
CONNECTOR: D-18
D-18 (GR)
HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
3
4
5
AK303090
D-18 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
AK303840
1
2
3
4
5
SERVICE
HOLE
AB
CONNECTOR: D-18
D-18 (GR)
HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
3
4
5
AK303091
D-18 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-455
STEP 6. Measure the sensor supply voltage at PCM
connector B-20 by using power plant ECU check harness
special tool MB991923.
(1) Disconnect the all PCM connectors and connect power
plant ECU check harness special tool MB991923 between
the separated connectors.
(2) Turn the ignition switch to the "ON" position.
AK303092
25
21
24 23 22
29 28 27 26
34 33 32 31 30
38 37 36 35
43 42 41 40 39
CONNECTOR: B-20
B-20
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
AK203002
25
21
24 23 22
29 28 27 26
34 33 32 31 30
38 37 36 35
43 42 41 40 39
AB
POWER PLANT ECU
CHECK HARNESS CONNECTOR
MB991923
PCM
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