Mitsubishi Galant 9G. Manual — part 704
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-258
STEP 5. Using scan tool MB991958, check data list item 69:
Cylinder 1, 4 Heated Oxygen Sensor (rear).
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) Start the engine and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item
69, Cylinder 1, 4 Heated Oxygen Sensor (rear).
• Warming up the engine. When the engine is revved, the
output voltage should repeat 0 volt and 0.6 to 1.0 volt
alternately.
(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 15.
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-259
STEP 6. Check harness connector B-38 at cylinder 1, 4
heated oxygen sensor (rear) and harness connector B-22
at PCM for damage.
Q: Is the harness connector in good condition?
YES : Repair harness wire between cylinder 1, 4 heated
oxygen sensor (rear) connector B-38 (terminal No. 4)
and PCM connector B-22 (terminal No. 97) because
of open circuit or harness damage. Then go to Step
15.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then go to Step 15.
AK303826
1
2
3
4
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-38
B-38 (B)
CYLINDER 1, 4
HEATED OXYGEN
SENSOR (REAR)
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-260
STEP 7. Check harness connector B-38 at cylinder 1, 4
heated oxygen sensor (rear) for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 8.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then go to Step 15.
AK303826
1
2
3
4
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-38
B-38 (B)
CYLINDER 1, 4
HEATED OXYGEN
SENSOR (REAR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-261
STEP 8. Check the continuity at cylinder 1, 4 heated
oxygen sensor (rear) harness side connector B-38.
(1) Disconnect the connector B-38 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.
AK303826
1
2
3
4
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-38
B-38 (B)
CYLINDER 1, 4
HEATED OXYGEN
SENSOR (REAR)
AK000239BH
1
2
4 3
B-38 HARNESS
CONNECTOR:
COMPONENT SIDE
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