Mitsubishi Galant 9G. Manual — part 721
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-326
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 2 seconds or more have passed since the engine
starting sequence was completed.
Judgment Criteria
• Cylinder 2, 3 heated oxygen sensor (front) output
voltage has continued to be 1.2 volts or higher for
2 seconds.
.
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:)
• Short circuit in cylinder 2, 3 heated oxygen sen-
sor (front) output line.
• Connector damage.
• PCM failed.
START
END
NO
NO
YES
YES
MALFUNCTION
GOOD
2secs HAVE PASSED?
OUTPUT VOLTAGE > 1.2V
NO
YES
MONITORING
CONDITIONS
AK302020
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-327
DIAGNOSIS
STEP 1. Check harness connector B-36 at cylinder 2, 3
heated oxygen sensor (front) and harness connector B-22
at PCM for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then go to Step 3.
AK303830
1
2
3
4
AB
CONNECTOR: B-36
B-36 (GR)
CYLINDER 2, 3
HEATED OXYGEN
SENSOR (FRONT)
HARNESS
CONNECTOR:
COMPONENT SIDE
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-328
STEP 2. Check for short circuit to power supply between
cylinder 2, 3 heated oxygen sensor (front) connector B-36
(terminal No. 4) and PCM connector B-22 (terminal No. 91).
Q: Is the harness wire in good condition?
YES : Replace the PCM. Then go to Step 3.
NO : Repair it. Then go to Step 3.
AK303830
1
2
3
4
AB
CONNECTOR: B-36
B-36 (GR)
CYLINDER 2, 3
HEATED OXYGEN
SENSOR (FRONT)
HARNESS
CONNECTOR:
COMPONENT SIDE
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-329
STEP 3. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− OBD-II Drive Cycle − Procedure 6 −
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0152 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0153: Cylinder 2, 3 Heated Oxygen Sensor Circuit Slow Responce (sensor 1)
100
99
92
91
93 94 95
96 97 98
101 102 103 104
105 106 107 108
109 110 111 112 113
52
51
53 54 55 56
57
58 59 60 61 62
63
64 65 66 67 68 69
70
71 72 73 74 75
76
77 78 79 80 81 82
83
AK303828
1
2
3
4
BLA
CK
BLA
CK
TO PCM
FROM MFI RELAY
WHITE
69
91
4
3
1
CYLINDER 2, 3
HEATED OXYGEN
SENSOR (FRONT)
POWERTRAIN CONTROL
MODULE (PCM)
B-36
MU802665
2
B-22
Cylinder 2, 3 Heated Oxygen Sensor (front) Circuit
B-21
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