Mitsubishi Galant 9G. Manual — part 715
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-302
Judgment Criteria
• Input voltage supplied to the PCM interface circuit
is higher than 4.5 volts when 5 volts is applied to
the cylinder 1, 4 heated oxygen sensor (front)
output line via a resistor.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Procedure 6
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Cylinder 2, 3 heated oxygen sensor (front) deteri-
orated.
• Open or shorted circuit in cylinder 2, 3 heated
oxygen sensor (front) output line, or harness
damage.
• Open circuit in cylinder 2, 3 heated oxygen sen-
sor (front) ground line, or harness damage.
• Connector damage.
• PCM failed.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
• MB991316: Test Harness
• MB991923: Power Plant ECU Check Harness
STEP 1. Using scan tool MB991958, check data list item 11:
Cylinder 2, 3 Heated Oxygen Sensor (front).
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
11, Cylinder 2, 3 Heated Oxygen Sensor (front).
• Warming up the engine. When the engine is revved, the
output voltage should be 0.6 to 1.0 volt.
• Warming up the engine. When the engine is idling, the
output voltage should repeat 0.4 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 : Go to Step 2.
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-303
STEP 2. Measure the sensor output voltage at cylinder 2, 3
heated oxygen sensor (front) connector B-36 by
backprobing
(1) Do not disconnect the connector B-36.
(2) Start the engine and run at idle.
(3) Measure the voltage between terminal No. 4 and ground by
backprobing.
• Warming up the engine. When the engine is 2,500 r/min,
the output voltage should repeat 0 to 0.8 volt alternately.
(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 7.
AK303830
1
2
3
4
AB
CONNECTOR: B-36
B-36 (GR)
CYLINDER 2, 3
HEATED OXYGEN
SENSOR (FRONT)
HARNESS
CONNECTOR:
COMPONENT SIDE
1 2
4
3
AK201407AF
B-36 HARNESS
CONNECTOR:
HARNESS SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-304
STEP 3. Measure the sensor output voltage at PCM
connector B-22 by using power plant ECU check harness
special tool MB991923.
(1) Disconnect the all PCM connectors and connect power
plant ECU check harness special tool MB991923 between
the separated connectors.
(2) Start the engine and run at idle.
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
AK202956
104
96
94
95
93 92 91
99 98 97
103 102 101 100
108 107 106 105
113 112 111 110 109
AB
POWER PLANT ECU
CHECK HARNESS CONNECTOR
MB991923
PCM
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-305
(3) Measure the voltage between terminal No. 91 and ground.
• Warming up the engine. When the engine is 2,500 r/min,
the output voltage should repeat 0 to 0.8 volt alternately.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage within the specified range?
YES : Go to Step 4.
NO : Go to Step 6.
104
96
94
95
93 92 91
99 98 97
103 102 101 100
108 107 106 105
113 112 111 110 109
AK203108AB
POWER PLANT ECU
CHECK HARNESS
CONNECTOR
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