Mitsubishi Galant 9G. Manual — part 1011
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-344
STEP 2. Check for exhaust leak.
Q: Are there any abnormalities?
YES : Repair it. Then go to Step 12.
NO : Go to Step 3.
STEP 3. Check for intake system vacuum leak.
Q: Are there any abnormalities?
YES : Repair it. Then go to Step 12.
NO : Go to Step 4.
STEP 4. Check harness connector B-25 at the left bank
heated oxygen sensor (front) 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 12.
AK303071
1
2
3
4
LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)
CONNECTOR: B-25
B-25 (B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-345
STEP 5. Check the left bank heated oxygen sensor (front).
(1) Disconnect the left bank heated oxygen sensor (front)
connector B-25 and connect test harness special tool,
MD998464 to the connector on the left bank heated oxygen
sensor (front) side.
(2) Warm up the engine until engine coolant temperature
reaches 80
°C (176°F) or higher.
(3) Perform a racing for 5 minutes or more with the engine
speed of 4,500 r/min.
(4) Connect a digital voltage meter between terminal No. 2
(black clip) and terminal No. 4 (white clip).
(5) While repeatedly revving the engine, measure the left bank
heated oxygen sensor (front) output voltage.
Standard value: 0.6
− 1.0 volt
CAUTION
• Be very careful when connecting the jumper wires;
incorrect connection can damage the heated oxygen
sensor.
• Be careful the heater is broken when voltage of beyond
8 volts is applied to the heated oxygen sensor heater.
NOTE: If the sufficiently high temperature [of approximate
400
°
C (752
°
F) or more] is not reached although the heated
oxygen sensor is normal, the output voltage would be possi-
bly low although the rich air/fuel ratio. Therefore, if the out-
put voltage is low, use a jumper wire to connect the terminal
No.1 (red clip) and the terminal No. 3 (blue clip) of the
heated oxygen sensor with the positive terminal and the
negative terminal of 8 volts power supply respectively, then
check again.
Q: Is the voltage between 0.6 and 1.0 volt?
YES : Go to Step 6.
NO : Replace the left bank heated oxygen sensor (front).
Then go to Step 12.
AK303071
1
2
3
4
LEFT BANK
HEATED OXYGEN
SENSOR (FRONT)
CONNECTOR: B-25
B-25 (B)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
AKX01624
HEATED
OXYGEN
SENSOR
COMPONENT
SIDE
CONNECTOR
MD998464
WHITE
BLACK
AQ
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-346
STEP 6. Check harness connector B-27, B-26, B-30 at left
bank injector for damage.
(1) Remove the intake manifold.
(2) Check the left bank injector connector for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 7.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then go to Step 12.
STEP 7. Check the left bank injector.
(1) Disconnect each left bank injector connector.
(2) Measure the resistance between injector side connector
terminal No. 1 and No. 2.
Standard value: 10.5
− 13.5 ohms [at 20°C (68°F)]
Q: Is the measured resistance between 10.5 and 13.5 ohms
[at 20
°C (68°F)]?
YES : Go to Step 8.
NO : Replace the injector. Then go to Step 12.
AK303075
M
1
2
CONNECTOR: B-26, B-27, B-30
B-30 (GR)
B-27 (GR)
B-26 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AB
AK303075
M
1
2
CONNECTOR: B-26, B-27, B-30
B-30 (GR)
B-27 (GR)
B-26 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AB
AK000559
2
1
INJECTOR SIDE
CONNECTOR
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-347
STEP 8. Check harness connector B-22, B-23 at PCM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 9.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then go to Step 12.
AK303057
104
96
94
95
93 92 91
99 98 97
103 102 101 100
108 107 106 105
113 112 111 110 109
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
CONNECTORS: B-22, B-23
B-22 (B)
AB
B-23
B-22 HARNESS CONNECTOR:
COMPONENT SIDE
B-23 HARNESS CONNECTOR:
COMPONENT SIDE
PCM
AIR CLEANER
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