Mitsubishi Galant 9G. Manual — part 971
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-184
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 21:
Engine Coolant 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
21, Engine Coolant Temperature Sensor.
• The engine coolant 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
− 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-185
STEP 2. Measure the sensor output voltage at engine
coolant temperature sensor connector B-104 by
backprobing.
(1) Do not disconnect the connector B-104.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 1 and ground by
backprobing.
• When engine coolant temperature is −20°C (−4°F), volt-
age should be between 3.9 and 4.5 volts.
• When engine coolant temperature is 0°C (32°F), voltage
should be between 3.2 and 3.8 volts.
• When engine coolant temperature is 20°C (68°F), volt-
age should be between 2.3 and 2.9 volts.
• When engine coolant temperature is 40°C (104°F), volt-
age should be between 1.3 and 1.9 volts.
• When engine coolant temperature is 60°C (140°F), volt-
age should be between 0.7 and 1.3 volts.
• When engine coolant temperature is 80°C (176°F), volt-
age should be between 0.3 and 0.9 volt.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage within the specified range?
YES : Go to Step 3.
NO : Go to Step 5.
STEP 3. Check harness connector B-104 at the engine
coolant temperature sensor 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 14.
1
2
AK303037
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-104
AB
B-104 (B)
THROTTLE
BODY
AK303038
2
1
AB
B-104 HARNESS
CONNECTOR:
HARNESS SIDE
1
2
AK303037
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-104
AB
B-104 (B)
THROTTLE
BODY
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-186
STEP 4. Using scan tool MB991958, check data list item 21:
Engine Coolant 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
21, Engine Coolant Temperature Sensor.
• The engine coolant 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
− How to
Cope with Intermittent Malfunctions
.
NO : Replace the PCM. Then go to Step 14.
STEP 5. Check harness connector B-104 at engine coolant
temperature sensor for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 6.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then go to Step 14.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
1
2
AK303037
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-104
AB
B-104 (B)
THROTTLE
BODY
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-187
STEP 6. Measure the sensor supply voltage at engine
coolant temperature sensor harness side connector B-104.
(1) Disconnect the connector B-104 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 7.
STEP 7. Check harness connector B-22 at PCM for
damage.
Q: Is the harness connector in good condition?
YES : Replace the PCM. Then go to Step 14.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then go to Step 14.
1
2
AK303037
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-104
AB
B-104 (B)
THROTTLE
BODY
AK303039 AB
2 1
B-104 HARNESS
CONNECTOR:
COMPONENT SIDE
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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