Mitsubishi Galant (2004+). Manual — part 905
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-437
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 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) <2.4L ENGINE>
13A-438
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
AK203166
D-18 HARNESS
CONNECTOR:
COMPONENT SIDE
AC
AK303840
1
2
3
4
5
SERVICE
HOLE
AB
CONNECTOR: D-18
D-18 (GR)
HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
3
4
5
AK203167
D-18 HARNESS
CONNECTOR:
COMPONENT SIDE
AC
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-439
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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-440
(3) Measure the voltage between terminal No. 41 and ground.
• When fuel tank temperature is 0°C (32°F), voltage
should be between 2.7 and 3.1 volts.
• When fuel tank temperature is 20°C (68°F), voltage
should be between 2.1 and 2.5 volts.
• When fuel tank temperature is 40°C (104°F), voltage
should be between 1.6 and 2.0 volts.
• When fuel tank temperature is 80°C (176°F), voltage
should be between 0.8 and 1.2 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage normal?
YES : Go to Step 7.
NO : Go to Step 8.
STEP 7. Check harness connector B-20 at PCM for
damage.
Q: Is the harness connector in good condition?
YES : Check harness connector C-25 at intermediate
connector for damage, and repair or replace as
required. Refer to GROUP 00E, Harness Connector
Inspection
. If intermediate connector is in
good condition, repair harness wire between fuel tank
temperature sensor connector D-18 (terminal No. 3)
and PCM connector B-20 (terminal No. 41) because
of open circuit. Then go to Step 12.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 12.
25
21
24 23 22
29 28 27 26
34 33 32 31 30
38 37 36 35
43 42 41 40 39
AK203168AB
POWER PLANT ECU
CHECK HARNESS
CONNECTOR
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
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