Mitsubishi Galant (2004+). Manual — part 1107
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-121
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 2 seconds or more have passed since the engine
starting sequence was completed.
Judgement Criteria
• Intake air temperature sensor output voltage has
continued to be 4.6 volts or higher [corresponding
to an air intake temperature of
−40°C (−40°F) 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:)
• Intake air temperature sensor failed.
• Open intake air temperature sensor circuit, or
connector damage.
• PCM failed.
START
OUTPUT VOLTAGE < 0.2V
END
NO
NO
NO
YES
YES
YES
MALFUNCTION
GOOD
CONTINUOUS
FAILURE FOR 2secs
OUTPUT VOLTAGE > 4.6V
MONITORING
CONDITIONS
NO
YES
AK302384
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-122
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 13:
Intake Air 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
13, Intake Air Temperature Sensor.
• The intake air temperature and temperature shown with
the scan tool should approximately match.
(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 B-10 at the intake air
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
AK303015
2
1
3
4
AB
B-10 (GR)
CONNECTOR: B-10
HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-123
STEP 3. Check the intake air temperature sensor.
(1) Disconnect the intake air temperature sensor connector
B-10.
(2) Measure the resistance between intake air temperature
sensor side connector terminal No. 1 and No. 4.
• There should be continuity. (0.30 − 20 kΩ)
Q: Is the measured resistance between 0.30 and 20 k
Ω?
YES : Go to Step 4.
NO : Replace the mass airflow sensor. Then go to Step 11.
STEP 4. Measure the sensor supply voltage at intake air
temperature sensor harness side connector B-10.
(1) Disconnect the connector B-10 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 1 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.
AK303015
2
1
3
4
AB
B-10 (GR)
CONNECTOR: B-10
HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
3 4
AK203041
INTAKE AIR TEMPERATURE
SENSOR CONNECTOR
AB
AK303015
2
1
3
4
AB
B-10 (GR)
CONNECTOR: B-10
HARNESS
CONNECTOR:
COMPONENT SIDE
AK303034
2
1
3
4
B-10 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-124
STEP 5. Measure the sensor supply voltage at PCM
connector B-22 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) Disconnect the intake air temperature sensor connector
B-10.
(3) Turn the ignition switch to the "ON" position.
AK303016
104
96
94
95
93 92 91
99 98 97
103 102 101 100
108 107 106 105
113 112 111 110 109
CONNECTOR: B-22
B-22 (B)
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
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