Mitsubishi Galant (2004+). Manual — part 1134
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-229
STEP 2. Check for exhaust leaks.
Q: Are there any abnormalities?
YES : Repair it. Then go to Step 13.
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 13.
NO : Go to Step 4.
STEP 4. Check harness connector B-09 at the right 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
Connector Inspection
. Then go to Step 13.
1
2
3
4
AK303048
B-09 (B)
CONNECTOR: B-09
THROTTLE BODY
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-230
STEP 5. Check the right bank heated oxygen sensor
(front).
(1) Disconnect the right bank heated oxygen sensor (front)
connector B-09 and connect test harness special tool,
MD998464, to the connector on the right 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 tracing 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 right
bank heated oxygen sensor (front) output voltage.
Standard value: 0.6
− 1.0 volt
CAUTION
• Be very careful when connecting the jumper wire;
incorrect connection can damage the oxygen sensor.
• Be careful the heater is broken when voltage of beyond
8V is applied to the oxygen sensor heater.
NOTE: If the sufficiently high temperature (of approximate
400
°
C or more) is not reached although the oxygen sensor
is normal, the output voltage would be possibly low
although the rich air-fuel ratio. Therefore, if the output volt-
age is low, use a jumper wire to connect the terminal No.1
(red clip of special tool) and the terminal No. 3 (blue clip of
special tool) of the oxygen sensor with a (+) terminal and (-)
terminal of 8 V 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 right bank heated oxygen sensor (front).
Then go to Step 13.
1
2
3
4
AK303048
B-09 (B)
CONNECTOR: B-09
THROTTLE BODY
RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)
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-231
STEP 6. Check harness connector B-32 at intermediate
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
Connector Inspection
. Then go to Step 13.
STEP 7. Measure the right bank injector resistance at
intermediate connector B-32.
(1) Disconnect the intermediate connector B-32.
(2) Measure the resistance between each injector side
connector terminal.
a. Measure the resistance between terminal No. 5 and No.
9 when measuring No. 1 cylinder.
b. Measure the resistance between terminal No. 9 and No.
10 when measuring No. 3 cylinder.
c. Measure the resistance between terminal No. 4 and No.
9 when measuring No. 5 cylinder.
• Resistance should be between 10.5 and 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 10.
NO : Go to Step 8.
AK303053
3
4
5
8
9
1
2
6
7
10
CONNECTOR: B-32
HARNESS CONNECTOR:
COMPONENT SIDE
AB
B-32 (B)
AK303053
3
4
5
8
9
1
2
6
7
10
CONNECTOR: B-32
HARNESS CONNECTOR:
COMPONENT SIDE
AB
B-32 (B)
1
2 3
6
7 8
4 5
9 10
AK203093
B-32
INTERMEDIATE
CONNECTOR
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-232
STEP 8. Check harness connector B-03, B-04, B-01 at right
bank injector for damage.
(1) Remove the intake manifold.
(2) Check the right bank injector connector, which deviates
from the standard value at Step 7.
Q: Is the harness connector in good condition?
YES : Go to Step 9.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 13.
STEP 9. Check the right bank injector.
(1) Check the right bank injector, which deviates from the
standard value at Step 7.
(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 : Repair harness wire between injector intermediate
connector and right bank injector connector because
of harness damage. Then go to Step 13.
NO : Replace the injector. Then go to Step 13.
AK303055
M
1
2
CONNECTOR: B-01, B-03, B-04
AB
B-01 (GR)
B-03 (GR)
B-04 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AK303055
M
1
2
CONNECTOR: B-01, B-03, B-04
AB
B-01 (GR)
B-03 (GR)
B-04 (GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AK000559
2
1
INJECTOR SIDE
CONNECTOR
AB
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