Mitsubishi Galant 9G. Manual — part 685
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-182
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.
AK303815
1
2
AB
CONNECTOR: B-104
B-104 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
AK201572
2
1
AD
B-104 HARNESS
CONNECTOR:
HARNESS SIDE
AK303815
1
2
AB
CONNECTOR: B-104
B-104 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-183
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.
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AK303815
1
2
AB
CONNECTOR: B-104
B-104 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-184
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.
AK303815
1
2
AB
CONNECTOR: B-104
B-104 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
AK000234 AR
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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-185
STEP 8. Check the continuity at engine coolant
temperature sensor harness side connector B-104.
(1) Disconnect the connector B-104 and measure at the
harness side.
(2) Check for the continuity between terminal No. 2 and
ground.
• Should be less than 2 ohms.
Q: Does continuity exist?
YES : Go to Step 11.
NO : Go to Step 9.
STEP 9. Check harness connector B-21 at PCM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 10.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then go to Step 14.
AK303815
1
2
AB
CONNECTOR: B-104
B-104 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
AK000235
B-104 HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
AQ
AK303018
55
56
54 53 52 51
57
62 61 60 59 58
63
69 68 67 66 65 64
70
75 74 73 72 71
76
82 81 80 79 78 77
83
CONNECTOR: B-21
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
B-21 (B)
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