Mitsubishi Galant 9G. Manual — part 1041
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-464
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 0.1
volt or lower 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.
• Shorted fuel tank temperature sensor circuit 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-465
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
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-466
STEP 2. 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 3.
NO : Replace the fuel tank temperature sensor. Then go to
Step 5.
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-467
STEP 3. Check harness connector D-18 at the fuel tank
temperature sensor and harness connector B-20 at PCM
for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then go to Step 5.
AK303840
1
2
3
4
5
SERVICE
HOLE
AB
CONNECTOR: D-18
D-18 (GR)
HARNESS
CONNECTOR:
COMPONENT SIDE
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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