Mitsubishi Galant 9G. Manual — part 1147
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-888
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
9A: Throttle Position Sensor (main) Mid Opening Learning
Value.
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
9A, Throttle position sensor (main) mid opening learning
value.
• Check that it is between 0.6 and 1.2 volts.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is the measured voltage 4 volts or less?
YES : Go to Step 2..
NO : Replace the throttle body assembly. Then go to Step
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-889
STEP 2. Check the throttle actuator control motor.
(1) Disconnect the connector B-06.
(2) Measure the resistance between throttle actuator control
motor side connector terminal No. 1 and No. 2.
Standard value: 0.3
− 80 ohms [at 20°C (68°F)]
Q: Is the measured resistance between 0.3 and 80 ohms [at
20
°C (68°F)]?
YES : Go to Step 3.
NO : Replace the throttle body assembly. Then go to Step
STEP 3. Check harness connector B-06 at throttle actuator
control motor 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 8..
2 1
6 5 4 3
AK303044
HARNESS
CONNECTOR:
COMPONENT SIDE
B-06 (B)
CONNECTOR: B-06
AB
6
1 2 3 4 5
AK202992
THROTTLE ACTUATOR
CONTROL MOTOR
CONNECTOR
AB
2 1
6 5 4 3
AK303044
HARNESS
CONNECTOR:
COMPONENT SIDE
B-06 (B)
CONNECTOR: B-06
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-890
STEP 4. Check harness connector B-23 at PCM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then go to Step 8.
127 126 125 124 123 122 121
133 132 131 130 129 128
140 139 138 137 136 135 134
146 145 144 143 142 141
153 152 151 150 149 148 147
AK303058
HARNESS CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-23
B-23
PCM
AB
AIR CLEANER
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-891
STEP 5. Check for harness damage between throttle
actuator control motor connector B-06 (terminal No. 1) and
PCM connector B-23 (terminal No. 147).
Q: Is the harness wire in good condition?
YES : Go to Step 6.
NO : Repair it. Then go to Step 8.
2 1
6 5 4 3
AK303044
HARNESS
CONNECTOR:
COMPONENT SIDE
B-06 (B)
CONNECTOR: B-06
AB
127 126 125 124 123 122 121
133 132 131 130 129 128
140 139 138 137 136 135 134
146 145 144 143 142 141
153 152 151 150 149 148 147
AK303058
HARNESS CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-23
B-23
PCM
AB
AIR CLEANER
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