Mitsubishi Galant (2004+). Manual — part 884
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-353
STEP 10. Check for harness damage between cylinder 2, 3
heated oxygen sensor (front) connector B-36 (terminal No.
3) and PCM connector B-23 (terminal No. 125).
Q: Is the harness wire in good condition?
YES : Go to Step 11.
NO : Repair it. Then go to Step 12.
AK303830
1
2
3
4
AB
CONNECTOR: B-36
B-36 (GR)
CYLINDER 2, 3
HEATED OXYGEN
SENSOR (FRONT)
HARNESS
CONNECTOR:
COMPONENT SIDE
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
AK303058
HARNESS CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-23
B-23
PCM
AB
AIR CLEANER
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-354
STEP 11. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− OBD-II Drive Cycle − Procedure 6 −
Other Monitor
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0155 set?
YES : Replace the PCM. Then go to Step 12.
NO : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
STEP 12. 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 −
Other Monitor
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0155 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-355
DTC P0156: Cylinder 2, 3 Heated Oxygen Sensor Circuit (sensor 2)
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
100
99
92
91
93 94 95
96 97 98
101 102 103 104
105 106 107 108
109 110 111 112 113
AK303833
1
2
3
4
GREEN
BLUE
BLA
CK
BLA
CK
TO PCM
FROM MFI RELAY
69
96
2
4
3
1
B-22
CYLINDER 2, 3
HEATED OXYGEN
SENSOR (REAR)
POWERTRAIN CONTROL
MODULE (PCM)
B-35
MU802605
Cylinder 2, 3 Heated Oxygen Sensor (rear) Circuit
B-21
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-356
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the PCM (ter-
minal No. 96) from the output terminal (terminal
No. 4) of the cylinder 2, 3 heated oxygen sensor
(rear).
• Terminal No. 2 of the cylinder 2, 3 heated oxygen
sensor (rear) is grounded with PCM (terminal No.
69).
.
TECHNICAL DESCRIPTION
• The output signal of the cylinder 2, 3 heated oxy-
gen sensor (front) is compensated by the output
signal of the cylinder 2, 3 heated oxygen sensor
(rear).
• The PCM checks for an open circuit in the cylin-
der 2, 3 heated oxygen sensor (rear) output line.
.
DESCRIPTIONS OF MONITOR METHODS
Cylinder 2, 3 heated oxygen sensor (rear) circuit is
switched to 5 volts intentionally when oxygen
sensor output is low, and detects the malfunction
if the output voltage changes to equal or greater
than 4.5 volts. The above procedure is repeated
when oxygen sensor is inactive.
.
MONITOR EXECUTION
Continuous
.
MONITOR EXECUTION CONDITIONS (Other
monitor and Sensor)
Other Monitor (There is no temporary DTC stored
in memory for the item monitored below)
• Heated oxygen sensor heater (front) monitor
• Heated oxygen sensor heater (rear) monitor
• Air/fuel ratio feedback monitor
Sensor (The sensor below is determined to be
normal)
• Mass airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
.
AK303834AB
CONNECTOR: B-35
B-35 (B)
CYLINDER 2, 3
HEATED OXYGEN
SENSOR (REAR)
AK303013
CONNECTORS: B-21, B-22
PCM
AB
AIR CLEANER
B-22 (B)
B-21 (B)
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